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MAGNITE, INC. - Quarter Report: 2019 June (Form 10-Q)

Table of Contents

UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549
__________________
FORM 10-Q
__________________
  (Mark One)

 ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934
For the quarterly period ended June 30, 2019
OR
☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934
For the transition period from _____________ to _____________
 
Commission File Number: 001-36384
__________________
THE RUBICON PROJECT, INC.
(Exact name of registrant as specified in its charter)
 __________________
Delaware
 
 
20-8881738
(State or other jurisdiction of incorporation or organization)
 
 
(I.R.S. Employer Identification No.)
 
 
 
 
12181 Bluff Creek Drive,
4th Floor
Los Angeles,
CA
 
90094
 
(Address of principal executive offices, including zip code)
 
 
 
 
Registrant's telephone number, including area code:
 
(310)
207-0272
 
_
______________

Securities registered pursuant to Section 12(b) of the Act:
Title of each class
Trading Symbol(s)
Name of each exchange on which registered
Common stock, par value $0.00001 per share
RUBI
New York Stock Exchange
Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days.   ☒ Yes   ☐ No  
Indicate by check mark whether the registrant has submitted electronically every Interactive Data File required to be submitted pursuant to Rule 405 of Regulation S-T (§232.405 of this chapter) during the preceding 12 months (or for such shorter period that the registrant was required to submit such files).  ☒ Yes   ☐ No   
Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, a smaller reporting company, or an emerging growth company. See the definitions of "large accelerated filer," "accelerated filer," "smaller reporting company," and "emerging growth company" in Rule 12b-2 of the Exchange Act.
Large accelerated filer
☐
Accelerated filer
☒
 
 
 
 
Non-accelerated filer
☐
Smaller reporting company
☒
 
 
 
 
 
 
Emerging growth company
☒
If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. ☒
Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Act).   ☐ Yes ☒  No
Indicate the number of shares outstanding of each of the registrant's classes of common stock, as of the latest practicable date.
Class
 
Outstanding as of July 24, 2019
Common Stock, $0.00001 par value
 
52,990,930

Table of Contents

THE RUBICON PROJECT, INC.
QUARTERLY REPORT ON FORM 10-Q
 
TABLE OF CONTENTS
 
 
Page No.
Part I.
Item 1.
 
 
 
 
 
 
Item 2.
Item 3.
Item 4.
Part II.
Item 1.
Item 1A.
Item 2.
Item 6.
 

2
Table of Contents

PART I. FINANCIAL INFORMATION
Item 1. Condensed Consolidated Financial Statements
THE RUBICON PROJECT, INC.
CONDENSED CONSOLIDATED BALANCE SHEETS
(In thousands, except per share amounts)
(unaudited)
 
June 30, 2019
 
December 31, 2018
ASSETS
 
 
 
Current assets:
 
 
 
Cash and cash equivalents
$
86,111

 
$
80,452

Marketable securities
—

 
7,524

Accounts receivable, net
178,025

 
205,683

Prepaid expenses and other current assets
5,901

 
6,882

TOTAL CURRENT ASSETS
270,037

 
300,541

Property and equipment, net
24,340

 
33,487

Right-of-use lease asset
14,497

 
—

Internal use software development costs, net
15,257

 
14,570

Intangible assets, net
8,589

 
10,174

Other assets, non-current
2,117

 
1,240

TOTAL ASSETS
$
334,837

 
$
360,012

LIABILITIES AND STOCKHOLDERS' EQUITY
 
 
 
Current liabilities:
 
 
 
Accounts payable and accrued expenses
$
213,157

 
$
239,678

Lease liabilities, current
6,826

 
—

Other current liabilities
531

 
1,304

TOTAL CURRENT LIABILITIES
220,514

 
240,982

Lease liabilities, non-current
8,516

 
—

Other liabilities, non-current
179

 
1,017

TOTAL LIABILITIES
229,209

 
241,999

Commitments and contingencies (Note 10)


 


STOCKHOLDERS' EQUITY
 
 
 
Preferred stock, $0.00001 par value, 10,000 shares authorized at June 30, 2019 and December 31, 2018; 0 shares issued and outstanding at June 30, 2019 and December 31, 2018
—

 
—

Common stock, $0.00001 par value; 500,000 shares authorized at June 30, 2019 and December 31, 2018; 52,984 and 51,159 shares issued and outstanding at June 30, 2019 and December 31, 2018, respectively
1

 
1

Additional paid-in capital
442,353

 
433,877

Accumulated other comprehensive loss
(293)

 
(259)

Accumulated deficit
(336,433)

 
(315,606)

TOTAL STOCKHOLDERS' EQUITY
105,628

 
118,013

TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY
$
334,837

 
$
360,012


The accompanying notes to unaudited condensed consolidated financial statements are an integral part of these statements.


3
Table of Contents

THE RUBICON PROJECT, INC.
CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS
(In thousands, except per share amounts)
(unaudited)
 
Three Months Ended
 
Six Months Ended
 
June 30, 2019
 
June 30, 2018
 
June 30, 2019
 
June 30, 2018
Revenue
$
37,870

 
$
28,648

 
$
70,286

 
$
53,524

Expenses:
 
 
 
 
 
 
 
Cost of revenue
15,085

 
15,044

 
30,201

 
29,827

Sales and marketing
11,519

 
11,135

 
22,111

 
23,392

Technology and development
9,839

 
9,245

 
19,555

 
19,739

General and administrative
10,027

 
11,441

 
20,307

 
23,985

Restructuring and other exit costs
—

 
974

 
—

 
3,440

Total expenses
46,470

 
47,839

 
92,174

 
100,383

Loss from operations
(8,600
)
 
(19,191
)
 
(21,888
)
 
(46,859
)
Other (income) expense:
 
 
 
 
 
 
 
Interest income, net
(214
)
 
(274
)
 
(407
)
 
(545
)
Other income
(46
)
 
(210
)
 
(188
)
 
(420
)
Foreign exchange (gain) loss, net
(143
)
 
(797
)
 
158

 
(243
)
Total other income, net
(403
)
 
(1,281
)
 
(437
)
 
(1,208
)
Loss before income taxes
(8,197
)
 
(17,910
)
 
(21,451
)
 
(45,651
)
Provision (benefit) for income taxes
84

 
74

 
(624
)
 
149

Net loss
$
(8,281
)
 
$
(17,984
)
 
$
(20,827
)
 
$
(45,800
)
Net loss per share:
 
 
 
 
 
 
 
Basic and Diluted
$
(0.16
)
 
$
(0.36
)
 
$
(0.40
)
 
$
(0.92
)
Weighted average shares used to compute net loss per share:
 
 
 
 
 
 
 
Basic and Diluted
52,358

 
50,071

 
51,969

 
49,883


The accompanying notes to unaudited condensed consolidated financial statements are an integral part of these statements.


 

4
Table of Contents

THE RUBICON PROJECT, INC.
CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS)
(In thousands)
(unaudited)
 
Three Months Ended
 
Six Months Ended
 
June 30, 2019
 
June 30, 2018
 
June 30, 2019

June 30, 2018
Net loss
$
(8,281
)
 
$
(17,984
)
 
$
(20,827
)
 
$
(45,800
)
Other comprehensive income (loss):
 
 
 
 
 
 
 
Unrealized gain on investments
—

 
16

 
2

 
6

Foreign currency translation adjustments
(128
)
 
(338
)
 
(36
)
 
(124
)
Other comprehensive loss
(128
)
 
(322
)
 
(34
)
 
(118
)
Comprehensive loss
$
(8,409
)
 
$
(18,306
)
 
$
(20,861
)
 
$
(45,918
)

The accompanying notes to unaudited condensed consolidated financial statements are an integral part of these statements.




5
Table of Contents

 

THE RUBICON PROJECT, INC.
CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS’ EQUITY
(In thousands)
(unaudited)
 
Common Stock 
 
Additional
Paid-In
Capital
 
Accumulated  Other
Comprehensive
Income (Loss)
 
Accumulated
Deficit
 
Total
Stockholders’
Equity
 
Shares
 
Amount
 
Balance at December 31, 2017
50,239

 
$
—

 
$
418,354

 
$
41

 
$
(253,784
)
 
$
164,611

Exercise of common stock options
9

 
—

 
6

 
—

 
—

 
6

Issuance of common stock related to RSU vesting
51

 
—

 
—

 
—

 
—

 
—

Shares withheld related to net share settlement
(19
)
 
—

 
(40
)
 
—

 
—

 
(40
)
Stock-based compensation
—

 
—

 
4,689

 
—

 
—

 
4,689

Other comprehensive income
—

 
—

 
—

 
204

 
—

 
204

Net loss
—

 
—

 
—

 
—

 
(27,816
)
 
(27,816
)
Balance at March 31, 2018
50,280

 
—

 
423,009

 
245

 
(281,600
)
 
141,654

Exercise of common stock options
40

 
—

 
39

 
—

 
—

 
39

Restricted stock awards, net
(156
)
 
—

 
—

 
—

 
—

 
—

Issuance of common stock related to employee stock purchase plan
89

 
—

 
143

 
—

 
—

 
143

Issuance of common stock related to RSU vesting
779

 
1

 
—

 
—

 
—

 
1

Shares withheld related to net share settlement
(282
)
 
—

 
(618
)
 
—

 
—

 
(618
)
Stock-based compensation
—

 
—

 
4,751

 
—

 
—

 
4,751

Other comprehensive income
—

 
—

 
—

 
(322
)
 
—

 
(322
)
Net loss
—

 
—

 
—

 
—

 
(17,984
)
 
(17,984
)
Balance at June 30, 2018
50,750

 
$
1

 
$
427,324

 
$
(77
)
 
$
(299,584
)
 
$
127,664

 
Common Stock 
 
Additional
Paid-In
Capital
 
Accumulated  Other
Comprehensive
Income (Loss)
 
Accumulated
Deficit
 
Total
Stockholders’
Equity
 
Shares
 
Amount
 
Balance at December 31, 2018
51,159

 
$
1

 
$
433,877

 
$
(259
)
 
$
(315,606
)
 
$
118,013

Exercise of common stock options
76

 
—

 
251

 
—

 
—

 
251

Restricted stock awards, net
(182
)
 
—

 
—

 
—

 
—

 
—

Issuance of common stock related to RSU vesting
1,171

 
—

 
—

 
—

 
—

 
—

Shares withheld related to net share settlement
(459
)
 
—

 
(1,835
)
 
—

 
—

 
(1,835
)
Stock-based compensation
—

 
—

 
4,514

 
—

 
—

 
4,514

Other comprehensive income
—

 
—

 
—

 
94

 
—

 
94

Net loss
—

 
—

 
—

 
—

 
(12,546
)
 
(12,546
)
Balance at March 31, 2019
51,765


1


436,807


(165
)

(328,152
)

108,491

Exercise of common stock options
79

 
—

 
132

 
—

 
—

 
132

Issuance of common stock related to employee stock purchase plan
118

 
—

 
477

 
—

 
—

 
477

Issuance of common stock related to RSU vesting
1,022

 
—

 
—

 
—

 
—

 
—

Shares withheld related to net share settlement
—

 
—

 
(12
)
 
—

 
—

 
(12
)
Stock-based compensation
—

 
—

 
4,949

 
—

 
—

 
4,949

Other comprehensive income
—

 
—

 
—

 
(128
)
 
—

 
(128
)
Net loss
—

 
—

 
—

 
—

 
(8,281
)
 
(8,281
)
Balance at June 30, 2019
52,984


$
1


$
442,353


$
(293
)

$
(336,433
)

$
105,628


The accompanying notes to unaudited condensed consolidated financial statements are an integral part of these statements.

6
Table of Contents


THE RUBICON PROJECT, INC.
CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS
(In thousands)
(unaudited)
 
Six Months Ended
 
June 30, 2019
 
June 30, 2018
OPERATING ACTIVITIES:
 
 
 
Net loss
$
(20,827
)
 
$
(45,800
)
Adjustments to reconcile net loss to net cash provided by (used in) operating activities:
 
 
 
Depreciation and amortization
16,814

 
17,588

Stock-based compensation
9,164

 
9,156

Loss on disposal of property and equipment
16

 
120

Provision for doubtful accounts
966

 
215

Accretion of available-for-sale securities
24

 
(318
)
Non-cash lease expense
(379
)
 
—

Unrealized foreign currency (gains) losses, net
777

 
(766
)
Deferred income taxes
(752
)
 
—

Changes in operating assets and liabilities:
 
 
 
Accounts receivable
26,831

 
12,342

Prepaid expenses and other assets
593

 
2,351

Accounts payable and accrued expenses
(27,567
)
 
(15,287
)
Other liabilities
(127
)
 
(691
)
Net cash provided by (used in) operating activities
5,533

 
(21,090
)
INVESTING ACTIVITIES:
 
 
 
Purchases of property and equipment
(2,212
)
 
(1,216
)
Capitalized internal use software development costs
(4,160
)
 
(4,817
)
Investments in available-for-sale securities
—

 
(23,991
)
Maturities of available-for-sale securities
7,500

 
41,150

Sales of available-for-sale securities
—

 
6,086

Net cash provided by investing activities
1,128

 
17,212

FINANCING ACTIVITIES:
 
 
 
Proceeds from exercise of stock options
383

 
45

Proceeds from issuance of common stock under employee stock purchase plan
477

 
143

Taxes paid related to net share settlement
(1,847
)
 
(658
)
Net cash used in financing activities
(987
)
 
(470
)
EFFECT OF EXCHANGE RATE CHANGES ON CASH, CASH EQUIVALENTS AND RESTRICTED CASH
(15
)
 
(47
)
CHANGE IN CASH, CASH EQUIVALENTS AND RESTRICTED CASH
5,659

 
(4,395
)
CASH, CASH EQUIVALENTS AND RESTRICTED CASH — Beginning of period
80,452

 
76,642

CASH, CASH EQUIVALENTS AND RESTRICTED CASH — End of period
$
86,111

 
$
72,247

SUPPLEMENTAL DISCLOSURES OF OTHER CASH FLOW INFORMATION:
 
 
 
Cash paid for income taxes
$
145

 
$
167

Cash paid for interest
$
25

 
$
30

Capitalized assets financed by accounts payable and accrued expenses
$
118

 
$
712

Capitalized stock-based compensation
$
299

 
$
284

Operating lease right-of-use assets obtained in exchange for new operating lease liabilities
$
3,237

 
$
—

The accompanying notes to unaudited condensed consolidated financial statements are an integral part of these statements.

7
Table of Contents

THE RUBICON PROJECT, INC.
NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS
(unaudited)
Note 1—Organization and Summary of Significant Accounting Policies
Company Overview
The Rubicon Project, Inc., or Rubicon Project (the "Company"), was formed on April 20, 2007 in Delaware and began operations in April 2007. The Company is headquartered in Los Angeles, California.
The Company provides a technology solution to automate the purchase and sale of digital advertising inventory for buyers and sellers. The Company's platform features applications and services for digital advertising sellers, including websites, mobile applications and other digital media properties, and their representatives, to sell their digital advertising inventory; applications and services for buyers, including advertisers, agencies, agency trading desks, and demand side platforms, or DSPs, to buy digital advertising inventory; and a marketplace over which such transactions are executed. In the second quarter of 2019, the Company announced the beta program for Demand Manager, which helps sellers effectively monetize their advertising inventory by making it easier to deploy, configure, and optimize Prebid-based header bidding solutions. Prebid is a free and open source suite of software products designed by advertising community developers to enable publishers to implement header bidding on their websites and from within their apps. Together, these features power and enhance a comprehensive, transparent, independent advertising marketplace that brings buyers and sellers together and facilitates intelligent decision making and automated transaction execution for the digital advertising inventory managed on the Company's platform. The Company's clients include many of the world's leading publishers of websites and mobile applications and buyers of digital advertising inventory.
Advertising inventory takes different forms, referred to as advertising units, is purchased and sold through different transactional methods, and allows advertising content to be presented to consumers through different channels. The Company's solution enables buyers and sellers to purchase and sell:
•
a comprehensive range of advertising units, including display, audio, and video;
•
that are transacted through real-time bidding, which includes (i) direct sale of premium inventory, which the Company refers to as private marketplace, or PMP, and (ii) open auction bidding, which the Company refers to as open marketplace, or OMP; and
•
that are displayed across digital channels, including mobile web, mobile application, and desktop, as well as across various out-of-home channels, such as digital billboards.
Risks and Uncertainties
The Company operates in the rapidly changing advertising industry and has faced demands by ad tech buyers for more efficiency and lower costs, changes in bidding technologies, and increased competition. The Company has adjusted its pricing model, which has reduced margins, and has lowered its expense structure to address these changes in the industry, resulting in net operating losses. The Company continues to incur net operating losses, despite having increased revenues and reduced costs. The Company must continue to increase revenues and/or manage costs in order to compensate for reduced margins, or it may not be able to grow its business and may continue to operate at a loss, depleting its cash resources and liquidity. If the Company continues to experience significant operating losses in the future, the Company may require additional liquidity to fund its operations.
Basis of Presentation and Summary of Significant Accounting Policies
The accompanying unaudited condensed consolidated financial statements have been prepared in accordance with United States Generally Accepted Accounting Principles, or GAAP, for interim financial information and the instructions to Form 10-Q and Article 10 of Regulation S-X. Accordingly, they do not include all of the information and footnotes required by GAAP for complete financial statements. In the opinion of management, all adjustments (consisting of normal recurring adjustments) considered necessary for a fair statement of the results for the interim period presented have been included. Operating results for the six months ended June 30, 2019 are not necessarily indicative of the results that may be expected for any future interim period, the year ending December 31, 2019, or for any future year.
The condensed consolidated balance sheet at December 31, 2018 has been derived from the audited financial statements at that date, but does not include all of the disclosures required by GAAP. The accompanying condensed consolidated financial statements should be read in conjunction with the Company's audited consolidated financial statements and notes thereto for the year ended December 31, 2018 included in its 2018 Annual Report on Form 10-K.
The Company adopted Accounting Standards Codification Topic 842 ("ASC 842")—Leases on January 1, 2019 using a modified retrospective approach. The adoption of this standard impacted only the financial statements included as of June 30, 2019 and for the three and six months ended June 30, 2019. See below for additional information regarding the Company's adoption of ASC 842. Aside from the adoption of ASC 842, there have been no significant changes in the Company's accounting policies from

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those disclosed in its audited consolidated financial statements and notes thereto for the year ended December 31, 2018 included in its Annual Report on Form 10-K.
Use of Estimates
The preparation of condensed consolidated financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported and disclosed financial statements and accompanying footnotes. Actual results could differ materially from these estimates.
Adoption of ASC 842
On January 1, 2019, the Company adopted ASC 842, which requires the recognition of the right-of-use assets, or ROU assets, and related lease liabilities on the balance sheet using a modified retrospective approach. The consolidated financial statements related to periods prior to January 1, 2019 were not restated, and continue to be reported under ASC Topic 840—Leases ("ASC 840"), which did not require the recognition of operating lease liabilities on the balance sheet. As a result, the consolidated financial statements related to periods prior to January 1, 2019 are not entirely comparative with current and future periods. As permitted under ASC 842, the Company elected several practical expedients that permit the Company to not reassess (1) whether existing contracts are or contain a lease, (2) the classification of existing leases, and (3) whether previously capitalized costs continue to qualify as initial indirect costs. In addition, the Company has elected not to recognize short-term leases on our balance sheet, nor separate lease and non-lease components for our data center leases. In addition, we utilized the portfolio approach to group leases with similar characteristics and did not use hindsight to determine lease term.
In addition to the leases previously reported under ASC 840, the Company also reviewed its data center agreements to identify non-lease components that should not be included in the lease liability and lease expense under ASC 842. Certain fixed non-lease components of data center leases, primarily fixed minimum power commitments, have been included in the lease liability and ROU asset as the Company has elected the practical expedient for its data centers to not separate the lease and non-lease components; however, variable components have not been included. For identified leases, the Company used its incremental borrowing rate to discount the related future payment obligations as of January 1, 2019 to determine its lease liability as of adoption. As of the adoption date, the Company recognized a lease liability of $15.6 million and a corresponding ROU asset of $14.3 million; there was no equity impact from the adoption. The difference between the lease liability and the ROU asset primarily represents the existing deferred rent liabilities balances before adoption, resulting from historical straight-lining of operating leases, which was effectively reclassified upon adoption to reduce the measurement of the ROU asset.
The Company records rent expense for operating leases, including leases of office locations, data centers, and equipment, on a straight-line basis over the lease term. The straight-line calculation of rent expense includes rent escalations on certain leases, as well as lease incentives provided by the landlords, including payments for leasehold improvements and rent-free periods. The Company begins recognition of rent expense on the commencement date, which is generally the date that the asset is made available for use. The lease liability is included in lease liabilities, current and lease liabilities, non-current within the condensed consolidated balance sheet, which are reduced as lease related payments are made. The ROU asset is amortized on a periodic basis over the expected term of the lease. See Note 11 for additional information.
Recent Accounting Pronouncements
Under the Jumpstart Our Business Startups Act, or the JOBS Act, the Company meets the definition of an emerging growth company. The Company has irrevocably elected to opt out of the extended transition period for complying with new or revised accounting standards pursuant to Section 107(b) of the JOBS Act.
In March 2019, the Financial Accounting Standards Board issued ASU 2019-01—Leases (Topic 842): Codification Improvements ("ASU 2019-01"), which clarifies certain topics around lease guidance. One of the provisions of ASU 2019-01 pertains to the Company as it updates existing guidance by explicitly allowing an exception to transition disclosures typically required, while adopting ASC 842. Under this guidance, entities that have adopted ASC 842 are not required to provide identical disclosures for the comparative previous year period in the year of adoption. ASU 2019-01 is required to be adopted concurrently with the adoption of ASC 842, and as such, the Company adopted ASU 2019-01 during the first quarter of 2019.


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Note 2—Net Income (Loss) Per Share
The following table presents the basic and diluted net loss per share:  
 
Three Months Ended
 
Six Months Ended
 
June 30, 2019
 
June 30, 2018
 
June 30, 2019
 
June 30, 2018
 
(in thousands, except per share data)
Basic and Diluted EPS:
 
 
 
 
 
 
 
Net loss
$
(8,281
)
 
$
(17,984
)
 
$
(20,827
)
 
$
(45,800
)
Weighted-average common shares outstanding
52,369

 
50,443

 
52,004

 
50,346

Weighted-average unvested restricted stock
(11
)
 
(372
)
 
(35
)
 
(463
)
Weighted-average common shares outstanding used to compute net loss per share
52,358

 
50,071

 
51,969

 
49,883

Basic and diluted net loss per share
$
(0.16
)
 
$
(0.36
)
 
$
(0.40
)
 
$
(0.92
)

The following weighted-average shares have been excluded from the calculation of diluted net loss per share attributable to common stockholders for each period presented because they are anti-dilutive:
 
Three Months Ended
 
Six Months Ended
 
June 30, 2019
 
June 30, 2018
 
June 30, 2019
 
June 30, 2018
 
(in thousands)
 
(in thousands)
Options to purchase common stock
605

 
18

 
559

 
27

Unvested restricted stock awards
5

 
301

 
24

 
244

Unvested restricted stock units
3,818

 
1,434

 
3,282

 
1,401

ESPP
28

 
36

 
28

 
49

Total shares excluded from net loss per share
4,456

 
1,789

 
3,893

 
1,721


Note 3—Revenues
The Company generates revenue from transactions where it provides a platform for the purchase and sale of digital advertising inventory. The Company’s advertising automation solution is a marketplace for sellers of digital advertising inventory (providers of websites, mobile applications and other digital media properties, and their representatives) and buyers of digital advertising inventory (including advertisers, agencies, agency trading desks, and demand-side platforms). This solution incorporates proprietary machine-learning algorithms, sophisticated data processing, high-volume storage, detailed analytics capabilities, and a distributed infrastructure. Together, these features form the basis for the Company’s automated advertising solution that brings buyers and sellers together and facilitates intelligent decision-making and automated transaction execution for the digital advertising inventory managed on the Company's platform. Digital advertising inventory is created when consumers access sellers’ content. Sellers provide digital advertising inventory to the Company’s platform in the form of advertising requests, or ad requests. When the Company receives ad requests from sellers, it sends bid requests to buyers, which enable buyers to bid on sellers’ digital advertising inventory. Winning bids can create advertising, or paid impressions, for the seller to present to the consumer.
The total volume of spending between buyers and sellers on the Company’s platform is referred to as advertising spend. The Company keeps a percentage of that advertising spend as a fee, and remits the remainder to the seller. The fee that the Company retains from the gross advertising spend on its platform is recognized as revenue. The fee earned on each transaction is based on the pre-existing agreement between the Company and the seller and the clearing price of the winning bid. The Company recognizes revenue upon fulfillment of its performance obligation to a client, which occurs at the point in time an ad renders and is counted as a paid impression, subject to an underlying agreement existing with the client and a fixed or determinable transaction price. Performance obligations for all transactions are satisfied, and the corresponding revenue is recognized, at a distinct point in time when an ad renders. The Company does not have arrangements with multiple performance obligations. The Company considers the following when determining if a contract exists under which the performance obligations have been satisfied: (i) contract approval by all parties, (ii) identification of each party’s rights regarding the goods or services to be transferred, (iii) specified payment terms, (iv) commercial substance of the contract, and (v) collectability of substantially all of the consideration is probable.
The Company has determined that it does not act as the principal in the purchase and sale of digital advertising inventory because it does not have control of the digital advertising inventory and does not set prices agreed upon within the auction marketplace, and therefore reports revenue on a net basis.

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Payment terms are specified in agreements between the Company and the buyers and sellers on its exchange platform. The Company generally bills buyers at the end of each month for the full purchase price of impressions filled in that month. The Company recognizes volume discounts as a reduction of revenue as they are incurred. Specific payment terms may vary by agreement, but are generally seventy-five days or less. The Company's accounts receivable are recorded at the amount of gross billings to buyers, net of allowances for the amounts the Company is responsible to collect. The Company's accounts payable related to amounts due to sellers are recorded at the net amount payable to sellers (see Note 5). Accordingly, both accounts receivable and accounts payable appear large in relation to revenue reported on a net basis.
The following table presents our revenue by channel for the three and six months ended June 30, 2019 and 2018:
 
Three Months Ended
 
Six Months Ended
 
June 30, 2019
 
June 30, 2018
 
June 30, 2019
 
June 30, 2018
 
(in thousands, except percentages)
Channel:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Desktop
$
16,588

 
44
%
 
$
13,663

 
48
%
 
$
31,809

 
45
%
 
$
27,972

 
52
%
Mobile
21,282

 
56

 
14,985

 
52

 
38,477

 
55

 
25,552

 
48

Total
$
37,870


100
%

$
28,648


100
%

$
70,286


100
%

$
53,524


100
%
The following table presents our revenue disaggregated by geographic location, based on the location of the Company's sellers:
 
Three Months Ended
 
Six Months Ended
 
June 30, 2019
 
June 30, 2018
 
June 30, 2019
 
June 30, 2018
 
(in thousands)
 
(in thousands)
United States
$
25,790

 
$
18,966

 
$
47,276

 
$
34,470

International
12,080

 
9,682

 
23,010

 
19,054

Total
$
37,870

 
$
28,648

 
$
70,286

 
$
53,524


Note 4—Fair Value Measurements
Recurring Fair Value Measurements    
Fair value represents the exchange price that would be received for an asset or paid to transfer a liability (an exit price) in the principal or most advantageous market for the asset or liability in an orderly transaction between market participants on the measurement date. Valuation techniques used to measure fair value must maximize the use of observable inputs and minimize the use of unobservable inputs. Observable inputs are based on market data obtained from independent sources. The fair value hierarchy is based on the following three levels of inputs, of which the first two are considered observable and the last one is considered unobservable:
•
Level 1 – Quoted prices (unadjusted) in active markets for identical assets or liabilities that the Company has the ability to access at the measurement date.
•
Level 2 – Inputs other than quoted prices included within Level 1 that are observable for the asset or liability, either directly or indirectly.
•
Level 3 – Unobservable inputs.
The table below sets forth a summary of financial instruments that are measured at fair value on a recurring basis at June 30, 2019:
 
Total
 
Quoted Prices in
Active Markets for
Identical Assets
(Level 1)
 
Significant Other
Observable Inputs
(Level 2)
 
Significant
Unobservable Inputs 
(Level 3)
 
(in thousands)
Cash equivalents
$
13,377

 
$
13,377

 
$
—

 
$
—


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The table below sets forth a summary of financial instruments that are measured at fair value on a recurring basis at December 31, 2018:
 
Total
 
Quoted Prices in
Active Markets for
Identical Assets
(Level 1)
 
Significant Other
Observable Inputs
(Level 2)
 
Significant
Unobservable Inputs 
(Level 3)
 
(in thousands)
Cash equivalents
$
13,692

 
$
13,692

 
$
—

 
$
—

U.S. Treasury, government and agency debt securities
$
7,524

 
$
7,524

 
$
—

 
$
—


At June 30, 2019 and December 31, 2018, cash equivalents of $13.4 million and $13.7 million, respectively, consisted of money market funds and commercial paper, with original maturities of three months or less. The carrying amounts of cash equivalents are classified as Level 1 or Level 2 depending on whether or not their fair values are based on quoted market prices for identical securities that are traded in an active market. Corporate debt securities (which are included in marketable securities on the balance sheet) with fair values derived from similar securities rather than based on quoted market prices for identical securities, are classified as Level 2 as well. The fair values of the Company's U.S. treasury, government and agency debt securities are based on quoted market prices and classified as Level 1, and are included within marketable securities.
Note 5—Other Balance Sheet Amounts
Investments in marketable securities as of December 31, 2018 consisted of the following:
 
Amortized
Cost
 
Gross
Unrealized
Gains
 
Gross
Unrealized
Losses
 
Fair
Value
 
(in thousands)
Available-for-sale—short-term:
 
 
 
 
 
 
 
U.S. Treasury, government and agency debt securities
$
7,526

 
$
—

 
$
(2
)
 
$
7,524


The Company had no available-for-sale securities as of June 30, 2019. For the three and six months ended June 30, 2019, there were no realized gains (losses) and there were no unrealized holding gains (losses) reclassified out of accumulated other comprehensive loss into the condensed consolidated statements of operations for the sale of available-for-sale investments. For the three and six months ended June 30, 2018, the Company sold $6.1 million of available-for-sale investments, on which the realized gains were de minimis and there were no unrealized holding gains (losses) reclassified out of accumulated other comprehensive loss into the condensed consolidated statements of operations.
Accounts payable and accrued expenses included the following:
 
June 30, 2019
 
December 31, 2018
 
(in thousands)
Accounts payable—seller
$
202,463

 
$
230,423

Accounts payable—trade
4,849

 
3,122

Accrued employee-related payables
5,845

 
6,133

Total
$
213,157

 
$
239,678


There was no restricted cash as of June 30, 2019 and December 31, 2018.


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Note 6—Intangible Assets
The Company’s intangible assets as of June 30, 2019 and December 31, 2018 included the following:
 
June 30, 2019
 
December 31, 2018
 
(in thousands)
Amortizable intangible assets:
 
 
 
Developed technology
$
16,878

 
$
16,878

Non-compete agreements
690

 
690

Trademarks
20

 
20

Total identifiable intangible assets, gross
17,588

 
17,588

Accumulated amortization—intangible assets:
 
 
 
Developed technology
(8,301
)
 
(6,888
)
Non-compete agreements
(678
)
 
(506
)
Trademarks
(20
)
 
(20
)
Total accumulated amortization—intangible assets
(8,999
)
 
(7,414
)
Total identifiable intangible assets, net
$
8,589

 
$
10,174


Amortization of intangible assets for the three months ended June 30, 2019 and 2018 was $0.8 million for both periods, and $1.6 million for both the six months ended June 30, 2019 and 2018. The estimated remaining amortization expense associated with the Company's intangible assets was as follows as of June 30, 2019:
Fiscal Year
Amount
 
(in thousands)
Remaining 2019
$
1,425

2020
2,826

2021
2,826

2022
1,512

2023
—

Thereafter
—

Total
$
8,589


Note 7—Stock-Based Compensation
The Company’s equity incentive plans provide for the grant of equity awards, including non-statutory or incentive stock options, restricted stock awards ("RSAs"), and restricted stock units ("RSUs"), to the Company's employees, officers, directors, and consultants. The Company's board of directors administers the plans. Outstanding options vest based upon continued service at varying rates, but generally over four years from issuance with 25% vesting after one year of service and the remainder vesting monthly thereafter. RSAs and RSUs vest at varying rates, typically approximately 25% vesting after approximately one year of service and the remainder vesting semi-annually thereafter, but with certain retention grants vesting 50% on each of the first and second anniversaries of the grant date. Options, RSAs, and RSUs granted under the plans accelerate under certain circumstances for certain participants upon a change in control, as defined in the governing plan. An aggregate of 4,444,960 shares remained available for future grants at June 30, 2019 under the plans.

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Stock Options
A summary of stock option activity for the six months ended June 30, 2019 is as follows:

Shares Under Option
 
Weighted- Average Exercise Price
 
Weighted- Average Contractual Life
 
Aggregate Intrinsic Value

(in thousands)
 
 
 
 
 
(in thousands)
Outstanding at December 31, 2018
3,488

 
$
7.06

 
 
 
 
Granted
1,184

 
$
4.98

 
 
 
 
Exercised
(156
)
 
$
2.46

 
 
 
 
Expired
(35
)
 
$
14.13

 
 
 
 
Forfeited
(73
)
 
$
2.62

 
 
 
 
Outstanding at June 30, 2019
4,408

 
$
6.68

 
7.45 years
 
$
6,829

Exercisable at June 30, 2019
2,340

 
$
8.69

 
6.07 years
 
$
2,720


The total intrinsic values of options exercised during the six months ended June 30, 2019 was $0.6 million. At June 30, 2019, the Company had unrecognized employee stock-based compensation expense relating to nonvested stock options of approximately $5.2 million, which is expected to be recognized over a weighted-average period of 2.9 years. The weighted-average grant date fair value per share of stock options granted during the six months ended June 30, 2019 was $2.85. Total fair value of options vested during the six months ended June 30, 2019 was $1.0 million.
The Company estimates the fair value of stock options that contain service and/or performance conditions using the Black-Scholes option pricing model. The weighted-average input assumptions used by the Company were as follows:
 
Three Months Ended
 
Six Months Ended
 
June 30, 2019
 
June 30, 2018
 
June 30, 2019
 
June 30, 2018
Expected term (in years)
N/A
 
N/A
 
6.1

 
6.1

Risk-free interest rate
N/A
 
N/A
 
2.51
%
 
2.66
%
Expected volatility
N/A
 
N/A
 
60
%
 
57
%
Dividend yield
N/A
 
N/A
 
—
%
 
—
%

Restricted Stock Awards
A summary of RSA activity for the six months ended June 30, 2019 is as follows:
 
Number of Shares
 
Weighted-Average Grant Date Fair Value
 
(in thousands)
 
 
Nonvested shares of restricted stock awards outstanding at December 31, 2018
197

 
$
12.06

Granted
—

 
$
—

Canceled
(182
)
 
$
11.92

Vested
(10
)
 
$
13.84

Nonvested shares of restricted stock awards outstanding at June 30, 2019
5

 
$
13.49


The aggregate fair value of restricted stock with service conditions that vested during the six months ended June 30, 2019 was $0.1 million. At June 30, 2019, the Company had unrecognized stock-based compensation expense for RSAs with service conditions of $0.1 million, which is expected to be recognized over a weighted-average period of 0.9 years.

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Restricted Stock Units
A summary of RSU activity for the six months ended June 30, 2019 is as follows:
 
Number of Shares
 
Weighted-Average Grant Date Fair Value
 
(in thousands)
 
 
Nonvested restricted stock units outstanding at December 31, 2018
6,100

 
$
3.56

Granted
4,668

 
$
4.68

Canceled
(288
)
 
$
3.58

Vested
(2,193
)
 
$
3.39

Nonvested restricted stock units outstanding at June 30, 2019
8,287

 
$
4.24


The weighted-average grant date fair value per share of RSUs granted during the six months ended June 30, 2019 was $4.68, which included 1.6 million RSUs that vest 50% annually over two years. The aggregate fair value of RSUs that vested during six months ended June 30, 2019 was $11.2 million. At June 30, 2019, the intrinsic value of nonvested RSUs was $52.7 million. At June 30, 2019, the Company had unrecognized stock-based compensation expense relating to nonvested RSUs of approximately $29.8 million, which is expected to be recognized over a weighted-average period of 2.5 years.
Employee Stock Purchase Plan
In November 2013, the Company adopted the Company's 2014 Employee Stock Purchase Plan ("ESPP"). The ESPP is designed to enable eligible employees to periodically purchase shares of the Company's common stock at a discount through payroll deductions of up to 10% of their eligible compensation, subject to any plan limitations. At the end of each six-month offering period, employees are able to purchase shares at a price per share equal to 85% of the lower of the fair market value of the Company's common stock on the first trading day of the offering period or on the last trading day of the offering period. Offering periods generally commence and end in May and November of each year.
As of June 30, 2019, the Company has reserved 2,001,256 shares of its common stock for issuance under the ESPP. The ESPP has an evergreen provision pursuant to which the share reserve will automatically increase on January 1st of each year in an amount equal to 1% of the total number of shares of capital stock outstanding on December 31st of the preceding calendar year, although the Company’s board of directors may provide for a lesser increase, or no increase, in any year.
Stock-Based Compensation Expense
Total stock-based compensation expense recorded in the condensed consolidated statements of operations was as follows:  
 
Three Months Ended
 
Six Months Ended
 
June 30, 2019
 
June 30, 2018
 
June 30, 2019

June 30, 2018
 
(in thousands)
 
(in thousands)
Cost of revenue
$
106

 
$
77

 
$
198

 
$
184

Sales and marketing
1,459

 
1,158

 
2,804

 
2,343

Technology and development
1,166

 
623

 
2,225

 
1,472

General and administrative
2,064

 
2,402

 
3,937

 
4,759

Restructuring and other exit costs
—

 
352

 
—

 
398

Total stock-based compensation expense
$
4,795

 
$
4,612

 
$
9,164

 
$
9,156


Note 8—Restructuring and Other Exit Costs
As part of its on-going efforts to control costs and create efficiencies, the Company undertook restructuring events in 2018 to streamline operations, prioritize resources for growth initiatives and increase profitability. Restructuring and other exit costs of $1.0 million and $3.4 million were incurred during the three and six months ended June 30, 2018, respectively, related to severance and one-time termination benefit costs.

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The following table summarizes restructuring and other exit cost activity for the six months ended June 30, 2018 (in thousands):
Accrued restructuring and other exit costs at January 1, 2018
$
—

Restructuring and other exit costs
3,440

Cash paid for restructuring and other exit costs
(2,561
)
Non-cash stock-based compensation for restructuring and other exit costs
(398
)
Accrued restructuring and other exit costs at June 30, 2018
$
481


As of December 31, 2018, the Company had $0.1 million accrued restructuring and other exit costs remaining. No restructuring and other exit costs were incurred during the three and six months ended June 30, 2019, and all remaining accrued costs associated with the 2018 restructuring events were paid in the first quarter of 2019.
Note 9—Income Taxes
In determining quarterly provisions for income taxes, the Company uses the annual estimated effective tax rate applied to the actual year-to-date income. The Company's annual estimated effective tax rate differs from the statutory rate primarily as a result of state taxes, foreign taxes, nondeductible stock option expenses, and changes in the Company's valuation allowance.
The Company recorded an income tax expense of $0.1 million and an income tax benefit of $0.6 million for the three and six months ended June 30, 2019, respectively, and income tax expenses of $0.1 million for both the three and six months ended June 30, 2018. The tax provision for the three and six months ended June 30, 2019 is primarily the result of the release of a foreign valuation allowance resulting from a change to a cost plus arrangement for a foreign subsidiary, the domestic valuation allowance, and the tax liability associated with the foreign subsidiaries.
On December 22, 2017, the U.S. government enacted the Tax Cuts and Jobs Act (the “Tax Act”). The Tax Act includes significant changes to the U.S. corporate income tax system including a federal corporate rate reduction from 34% to 21%. For additional information and a discussion of the impact of the Tax Act on the Company, refer to Note 15 of the "Notes to Consolidated Financial Statements" within our Annual Report on Form 10-K for December 31, 2018.
Due to uncertainty as to the realization of benefits from the Company's domestic and certain international deferred tax assets, including net operating loss carryforwards and research and development tax credits, the Company has a full valuation allowance reserved against such assets. The Company intends to continue to maintain a full valuation allowance on the deferred tax assets until there is sufficient evidence to support the reversal of all or some portion of these allowances.
There were no material changes to the Company's unrecognized tax benefits in the six months ended June 30, 2019, and the Company does not expect to have any significant changes to unrecognized tax benefits through the end of the fiscal year. Because of the Company's history of tax losses, all years remain open to tax audit.
Note 10—Commitments and Contingencies
Commitments
As of June 30, 2019 and December 31, 2018, the Company had $3.7 million and $2.9 million, respectively, of letters of credit associated with office leases available for borrowing, on which there were no outstanding borrowings as of either date. The Company also has operating lease agreements, discussed in more detail in Note 11.
Guarantees and Indemnification
The Company’s agreements with sellers, buyers, and other third parties typically obligate it to provide indemnity and defense for losses resulting from claims of intellectual property infringement, damages to property or persons, business losses, or other liabilities. Generally, these indemnity and defense obligations relate to the Company’s own business operations, obligations, and acts or omissions. However, under some circumstances, the Company agrees to indemnify and defend contract counterparties against losses resulting from their own business operations, obligations, and acts or omissions, or the business operations, obligations, and acts or omissions of third parties. For example, because the Company’s business interposes the Company between buyers and sellers in various ways, buyers often require the Company to indemnify them against acts and omissions of sellers, and sellers often require the Company to indemnify them against acts and omissions of buyers. In addition, the Company’s agreements with sellers, buyers, and other third parties typically include provisions limiting the Company’s liability to the counterparty, and the counterparty’s liability to the Company. These limits sometimes do not apply to certain liabilities, including indemnity obligations. These indemnity and limitation of liability provisions generally survive termination or expiration of the agreements in which they appear. The Company has also entered into indemnification agreements with its directors, executive officers, and certain other officers that will require the Company, among other things, to indemnify them against certain liabilities that may arise by reason of their status or service as directors, officers, or employees. No material demands have been made upon the Company to provide

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indemnification under such agreements and there are no claims that the Company is aware of that could have a material effect on the Company’s condensed consolidated financial statements.
Litigation
The Company and its subsidiaries may from time to time be parties to legal or regulatory proceedings, lawsuits and other claims incident to their business activities and to the Company’s status as a public company. Such routine matters may include, among other things, assertions of contract breach or intellectual property infringement, claims for indemnity arising in the course of the Company’s business, regulatory investigations or enforcement proceedings, and claims by persons whose employment has been terminated. Such matters are subject to many uncertainties, and outcomes are not predictable with assurance. Consequently, management is unable to ascertain the ultimate aggregate amount of monetary liability, amounts which may be covered by insurance or recoverable from third parties, or the financial impact with respect to such matters as of June 30, 2019. However, based on management’s knowledge as of June 30, 2019, management believes that the final resolution of these matters known at such date, individually and in the aggregate, will not have a material adverse effect upon the Company’s condensed consolidated financial position, results of operations or cash flows.
Employment Contracts
The Company has entered into severance agreements with certain employees and officers. The Company may be required to pay severance and accelerate the vesting of certain equity awards in the event of involuntary terminations.
Note 11—Lease Obligations
The Company adopted ASC 842 as of January 1, 2019. As part of the implementation, the Company recognized its lease liabilities, including the current and non-current portions, within its condensed consolidated balance sheet as of the adoption date, which represents the present value of the Company’s obligation related to the estimated future lease payments. The Company also recognized a right-of-use asset, or ROU asset, which represents the right to use the leased asset over the period of the lease. The ROU asset was calculated as the lease liability less any asset or liability balances that existed at the time of adoption.
The lease term is generally specified in the lease agreement, however certain agreements provide for lease term extensions or early termination options. To determine the period for the estimated future lease payments, the Company evaluates whether it is reasonably certain that it will exercise the option at the commencement date and periodically thereafter. Certain data center lease agreements include one year extension options or month-to-month extension options, and one or more of these extensions have been assumed for each lease that the Company believes to be an integral part of our business in the near term. The lease terms of the Company’s operating leases generally range from one year to seven years, and the weighted average remaining lease term of leases included in the lease liability is 3.1 years as of June 30, 2019.
To determine the estimated future lease payments, the Company reviews each of its lease agreements to identify the various payment components. For real estate and equipment leases, the Company includes only the actual lease components in its determination of future lease payments, and for its data center leases, includes both the fixed lease and non-lease components in the estimated future lease payments. This typically includes a fixed minimum power commitment that is included in the data center agreements, but it does not include any variable or usage-based additional charges. Once the estimated future lease payments are determined, the Company uses a discount rate to calculate the present value of the future lease payments. As of June 30, 2019, a weighted average discount rate of 5.20% has been applied to the remaining lease payments to calculate the lease liabilities included within the condensed consolidated balance sheet. This represents the incremental borrowing rate the Company would be subject to on borrowings from its available revolving debt agreement (See Note 12).
For the three and six months ended June 30, 2019, the Company recognized $1.8 million and $3.6 million, respectively, of lease expense under ASC 842, which included operating lease expenses associated with leases included in the lease liability and ROU asset on the condensed consolidated balance sheet. In addition, for the three and six months ended June 30, 2019, the Company recognized $0.2 million and $0.4 million, respectively, of lease expense related to short-term leases that are not included in the ROU asset or lease liability balances. For the three and six months ended June 30, 2018, the Company recognized rental expenses of $3.3 million and $6.5 million, respectively, under ASC 840, which included expenses related to short-term leases, and also included certain non-lease components including variable capacity related expenses at the data centers. The Company also received rental income of $46.2 thousand and $0.2 million for real estate leases for which it subleases the property to a third party during the three months ended June 30, 2019 and 2018, respectively, and $0.2 million and $0.4 million for the six months ended June 30, 2019 and 2018, respectively.

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The maturity of the Company's lease liabilities were as follows (in thousands):
Fiscal Year
 
Remaining 2019
$
3,808

2020
6,795

2021
3,043

2022
1,096

2023
809

Thereafter
1,046

Total lease payments (undiscounted)
16,597

Less: imputed interest
(1,255
)
Lease liabilities—total (discounted)
$
15,342


In addition to the leases included in these condensed consolidated financial statements, the Company entered into lease agreements for office locations in New York and New Jersey during the first half of 2019 that have not yet commenced as of June 30, 2019. The Company anticipates the recognition of approximately $9 million additional lease liabilities related to the New York and New Jersey leases when the properties are made available to the Company for use, which is expected to occur in the third quarter of 2019.

Note 12—Debt
In September 2018, the Company amended and restated its loan and security agreement with Silicon Valley Bank (the "Loan Agreement"). The Loan Agreement provides a senior secured revolving credit facility of up to $40.0 million with a maturity date of September 26, 2020. The Company incurred $0.1 million of debt issuance fees that were capitalized and are being amortized over the term of the Loan Agreement.
An unused revolver fee in the amount of 0.15% per annum of the average unused portion of the revolver line is charged and is payable monthly in arrears. The Company may elect for advances to bear interest calculated by reference to prime or LIBOR. If the Company elects LIBOR, amounts outstanding under the amended credit facility bear interest at a rate per annum equal to (a) LIBOR plus 2.50% if a streamline period applies or (b) LIBOR plus 4.00% if a streamline period does not apply. If the Company elects prime, advances bear interest at a rate of (a) prime plus 0.50% if a streamline period applies or (b) prime plus 2.00% if a streamline period does not apply. A streamline period is any period during which an event of default does not exist and the Company's Adjusted Quick Ratio (as defined in the Loan Agreement) is at least 1.05 for each day in the preceding month.
The Loan Agreement is collateralized by security interests in substantially all of the Company's assets. Subject to certain exceptions, the Loan Agreement restricts the Company's ability to, among other things, pay dividends, sell assets, make changes to the nature of the business, engage in mergers or acquisitions, incur, assume or permit to exist, additional indebtedness and guarantees, create or permit to exist, liens, make distributions or redeem or repurchase capital stock, or make other investments, engage in transactions with affiliates, make payments with respect to subordinated debt, and enter into certain transactions without the consent of the financial institution. If a streamline period is not in effect, the Company is required to maintain a lockbox arrangement where clients payments received in the lockbox will immediately reduce the amounts outstanding on the credit facility.
The Loan Agreement requires the Company to comply with financial covenants, including a minimum Adjusted Quick Ratio and the achievement of certain Adjusted EBITDA targets. On a monthly basis, or quarterly if there were no advances outstanding during the calendar quarter, the Company is required to maintain a minimum Adjusted Quick Ratio of: (i) 1.00 if the trailing six month Adjusted EBITDA is $0 or less, or (ii) 0.90 if the trailing six month Adjusted EBITDA is greater than $0. If the Company’s Adjusted Quick Ratio is 1.05 or greater, a streamline period applies. As of June 30, 2019, the Company's Adjusted Quick Ratio was 1.16, which is in compliance with its covenant requirement and is higher than the minimum Adjusted Quick Ratio required to qualify for a streamline period. The Company must also maintain the following trailing twelve month Adjusted EBITDA targets as of the end of each quarter as follows: (1) September 30, 2018 through June 30, 2019 Adjusted EBITDA must be within 20% of the Adjusted EBITDA projections that were delivered to Silicon Valley Bank; (2) September 30, 2019 Adjusted EBITDA of $1 or greater; and (3) December 31, 2019 and thereafter, Adjusted EBITDA of $5.0 million or greater. As of June 30, 2019, the Company was in compliance with the Adjusted EBITDA covenant.
The Loan Agreement also includes customary representations and warranties, affirmative covenants, and events of default, including events of default upon a change of control and material adverse change (as defined in the Loan Agreement). Following an

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event of default, SVB would be entitled to, among other things, accelerate payment of amounts due under the credit facility and exercise all rights of a secured creditor.
As of June 30, 2019, there were no amounts outstanding under the Loan Agreement. Future availability under the credit facility is dependent on several factors including the available borrowing base and compliance with future covenant requirements.


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Item 2. Management's Discussion and Analysis of Financial Condition and Results of Operations
This Quarterly Report on Form 10-Q and related statements by the Company contain forward-looking statements, including statements based upon or relating to our expectations, assumptions, estimates, and projections. In some cases, you can identify forward-looking statements by terms such as "may," "might," "will," "objective," "intend," "should," "could," "can," "would," "expect," "believe," "design," "anticipate," "estimate," "predict," "potential," "plan" or the negative of these terms, and similar expressions. Forward-looking statements may include, but are not limited to, statements concerning our anticipated financial performance, including, without limitation, revenue, advertising spend, non-GAAP loss per share, profitability, net income (loss), Adjusted EBITDA, earnings per share, and cash flow; strategic objectives, including focus on header bidding, mobile, video, Demand Manager, and private marketplace opportunities; investments in our business; development of our technology; introduction of new offerings; the impact of transparency initiatives we may undertake; the impact of our traffic shaping technology on our business; the effects of our cost reduction initiatives; scope and duration of client relationships; the fees we may charge in the future; business mix and expansion of our mobile, video and private marketplace offerings; sales growth; client utilization of our offerings; our competitive differentiation; our market share and leadership position in the industry; market conditions, trends, and opportunities; user reach; certain statements regarding future operational performance measures including ad requests, fill rate, paid impressions, average CPM, take rate, and advertising spend; benefits from supply path optimization; and factors that could affect these and other aspects of our business. These statements are not guarantees of future performance; they reflect our current views with respect to future events and are based on assumptions and estimates and subject to known and unknown risks, uncertainties and other factors that may cause our actual results, performance or achievements to be materially different from expectations or results projected or implied by forward-looking statements. These risks include, but are not limited to:
•
our ability to continue to grow and to manage our growth effectively;
•
our ability to develop innovative new technologies and remain a market leader;
•
our ability to attract and retain buyers and sellers and increase our business with them;
•
our vulnerability to loss of, or reduction in spending by, buyers;
•
our reliance on large sources of advertising demand and aggregators of advertising inventory;
•
our ability to maintain and grow a supply of advertising inventory from sellers and to fill the increased inventory;
•
the effect on the advertising market and our business from difficult economic conditions or uncertainty;
•
the freedom of buyers and sellers to direct their spending and inventory to competing sources of inventory and demand;
•
our ability to use our solution to purchase and sell higher value advertising and to expand the use of our solution by buyers and sellers utilizing evolving digital media platforms;
•
our ability to introduce new offerings and bring them to market in a timely manner, and otherwise adapt in response to client demands and industry trends, including shifts in digital advertising growth from desktop to mobile channels and from display to video formats and the introduction and market acceptance of Demand Manager;
•
the increased prevalence of header bidding and its effect on our competitive position;
•
uncertainty of our estimates and expectations associated with new offerings, including header bidding, private marketplace, mobile, video, Demand Manager, and traffic shaping;
•
lower fees and take rate and the need to grow through advertising spend increases rather than fee increases;
•
our ability to compensate for a reduced take rate by increasing the volume and/or value of transactions on our platform and increasing our fill rate;
•
our vulnerability to the depletion of our cash resources as we incur additional investments in technology required to support the increased volume of transactions on our exchange and development of new offerings;
•
our ability to support our growth objectives with reduced resources from our cost reduction initiatives;
•
our ability to raise additional capital if needed and/or renew our working capital line of credit;
•
our limited operating history and history of losses;
•
our ability to continue to expand into new geographic markets;
•
our ability to adapt effectively to shifts in digital advertising;
•
increased prevalence of ad-blocking or cookie-blocking technologies;
•
the slowing growth rate of desktop display advertising;
•
the growing percentage of online and mobile advertising spending captured by owned and operated sites (such as Facebook, Google, and Amazon);

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•
the effects, including loss of market share, of increased competition in our market and increasing concentration of advertising spending, including mobile spending, in a small number of very large competitors;
•
the effects of consolidation in the ad tech industry;
•
acts of competitors and other third parties that can adversely affect our business;
•
our ability to differentiate our offerings and compete effectively in a market trending increasingly toward commodification, transparency, and disintermediation;
•
requests for discounts, fee concessions or revisions, rebates, refunds, favorable payment terms and greater levels of pricing transparency and specificity;
•
potential adverse effects of malicious activity such as fraudulent inventory and malware;
•
the effects of seasonal trends on our results of operations;
•
costs associated with defending intellectual property infringement and other claims;
•
our ability to attract and retain qualified employees and key personnel;
•
our ability to identify future acquisitions of or investments in complementary companies or technologies and our ability to consummate the acquisitions and integrate such companies or technologies; and
•
our ability to comply with, and the effect on our business of evolving legal standards and regulations, particularly concerning data protection and consumer privacy and evolving labor standards.
We discuss many of these risks and additional factors that could cause actual results to differ materially from those anticipated by our forward-looking statements under the headings "Risk Factors" and "Management's Discussion and Analysis of Financial Condition and Results of Operations," and elsewhere in this report and in other filings we have made and will make from time to time with the Securities and Exchange Commission, or SEC, including our Annual Report on Form 10-K for the year ended December 31, 2018 and subsequent Quarterly Reports on Form 10-Q. These forward-looking statements represent our estimates and assumptions only as of the date of the report in which they are included. Unless required by federal securities laws, we assume no obligation to update any of these forward-looking statements, or to update the reasons actual results could differ materially from those anticipated, to reflect circumstances or events that occur after the statements are made. Without limiting the foregoing, any guidance we may provide will generally be given only in connection with quarterly and annual earnings announcements, without interim updates, and we may appear at industry conferences or make other public statements without disclosing material nonpublic information in our possession. Given these uncertainties, investors should not place undue reliance on these forward-looking statements.
Investors should read this Quarterly Report on Form 10-Q and the documents that we reference in this report and have filed or will file with the SEC completely and with the understanding that our actual future results may be materially different from what we expect. We qualify all of our forward-looking statements by these cautionary statements.
The following discussion should be read in conjunction with our unaudited condensed consolidated financial statements and notes thereto appearing elsewhere in this Quarterly Report on Form 10-Q.
Overview
We provide a technology solution to automate the purchase and sale of digital advertising inventory for buyers and sellers. Our platform features applications and services for digital advertising inventory sellers, including websites, mobile applications, other digital media properties, and their representatives, to sell their digital advertising inventory; applications and services for buyers, including advertisers, agencies, agency trading desks, and demand side platforms, or DSPs, to buy digital advertising inventory; and a marketplace over which such transactions are executed. Together, these features power and enhance a comprehensive, transparent, independent advertising marketplace that brings buyers and sellers together and facilitates intelligent decision making and automated transaction execution for the digital advertising inventory we manage on our platform. Our clients include many of the world’s leading publishers of websites and mobile applications and buyers of digital advertising inventory.
Advertising inventory takes different forms, referred to as advertising units, is purchased and sold through different transactional methods, and allows advertising content to be presented to consumers through different channels. Our solution enables buyers and sellers to purchase and sell:
•
a comprehensive range of advertising units, including display, audio, and video;
•
that are transacted through real-time bidding, which includes (i) direct sale of premium inventory, which we refer to as private marketplace ("PMP"), and (ii) open auction bidding, which we refer to as open marketplace ("OMP"); and

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•
that are displayed across digital channels, including mobile web, mobile application, desktop, and connected TV ("CTV"), as well as across various out-of-home channels, such as digital billboards.
We generate revenue from transactions where we provide a platform for the purchase and sale of digital advertising inventory. Digital advertising inventory is created when consumers access sellers’ content. Sellers provide digital advertising inventory to our platform in the form of advertising requests, or ad requests. When we receive ad requests from sellers, we send bid requests to buyers, which enable buyers to bid on sellers’ digital advertising inventory. Winning bids can create advertising, or paid impressions, for the seller to present to the consumer. The volume of paid impressions measured as a percentage of ad requests is referred to as fill rate. The price that buyers pay for each thousand paid impressions purchased is measured in units referred to as CPM.
The total volume of spending between buyers and sellers on our platform is referred to as advertising spend. We keep a percentage of that advertising spend as a fee, and remit the remainder to the seller. The fee that we retain from the gross advertising spend on our platform is recognized as revenue. The fee earned on each transaction is based on the pre-existing agreement between the Company and the seller and the clearing price of the winning bid. We also refer to revenue divided by advertising spend as our take rate.

Industry Trends and Trends in Our Business
Market Opportunities
The programmatic digital advertising market continues to experience growth. In September 2018, MAGNA estimated that the global programmatic market (excluding search and social) will grow from $34 billion in 2018 to $60 billion by 2022, which represents a 15% compound annual growth rate over that period. Another important trend in the digital advertising industry is the continued expansion of automated buying and selling of advertising inventory through new and developing channels, including mobile, which has market growth rates exceeding those of the desktop channel and is a critical area of operational focus for us. According to MAGNA estimates, mobile advertising was an $18 billion global market in 2018 that is expected to increase to $43 billion by 2022, producing a compound annual growth rate of 24%.
Consistent with industry trends, our mobile business is growing faster than desktop. Our mobile revenue increased $12.9 million, or 51%, for the six months ended June 30, 2019, compared to the six months ended June 30, 2018, while our desktop revenue increased 14% during the same period. Our mobile business consists of two components, mobile web and mobile applications. Initially our mobile business was built upon mobile web, which is more similar to our desktop business and subject to similar market pressures as discussed below, and as a result has experienced lower growth in recent periods. Our mobile application business has shown growth rates in excess of industry projections. Revenue from mobile applications is approximately half of our mobile business.
We enable an omni-channel approach to expand automatic buying and selling of advertising to all forms of inventory through various channels and have observed growth trends in emerging formats like video and audio. According to MAGNA estimates, video advertising was $17 billion in 2018 and is projected to increase to $45 billion in 2022, with a compound annual growth rate of 27%. We expect video to be a meaningful driver of our future growth with a longer-term opportunity in connected television, or CTV, advertising as more linear TV budgets shift to programmatic.
The growth of automated buying and selling of advertising is also expanding into geographic markets outside of the United States, and in some markets, the adoption rate of programmatic digital advertising is greater than in the United States. We attribute advertising spend to the geographic location of the seller on whose inventory the advertising spend was directed. Our markets outside of the United States are more heavily built upon desktop display advertising than they are on mobile, and as such are subject to the same factors impacting our desktop business as described below. In addition, as programmatic advertising has grown in markets outside of the United States, we have seen more competitors enter those markets aggressively and gain market share. Another factor impacting our business is that a large share of the growth in digital advertising spending worldwide is being captured by owned and operated sites, such as Facebook, Google, and increasingly Amazon.
Macro Trends Impacting Our Business
In recent years, we have seen an industry-wide slowdown in the growth rate for traditional desktop advertising, and the growth rate for this portion of the market is expected to flatten in future years. According to MAGNA, programmatic desktop advertising is expected to grow at a 1% compound annual growth rate over the 2018-2022 period. This results from the market shift to mobile channels noted above. These market factors present long-term growth opportunities; however, in the near term, these trends are dampening our overall growth rate, because desktop advertising continues to be a meaningful part of our core business, representing 45% of revenue in the first half of 2019.

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Header bidding, which increases competition for ad inventory by exposing impressions simultaneously to multiple sources of demand in a competitive auction, has been a transformative change in programatic digital advertising over the last several years. While we initially lagged industry adoption, header bidding now represents roughly 80% of our revenue. Header bidding is going through an additional technical evolution from the client side, which involves the browser running the auction, to a server-side solution, in which a server runs the auction and offers the potential for improved performance and speed. We believe that our investments in our client-side header bidding solution, as well as server-side header bidding, have the potential to improve our competitiveness in all markets in future periods. However, we must continue to address certain technical and operational challenges, as described under "Risk Factors" in our Annual Report on Form 10-K for the year ended December 31, 2018, in order to realize our header bidding solution's full potential.
While the rise of header bidding increased revenue for sellers, it also created new challenges. Managing multiple exchanges on the page is technically complex, and in the early days of header bidding this complexity was exacerbated by the lack of independent technology standards. In 2017, we began to address these issues through our support of Prebid, a free and open source suite of software products designed by advertising community developers to enable publishers to implement header bidding on their websites and from within their apps. Despite Prebid’s adoption by a number of the world’s largest sellers, deploying and customizing it still requires dedicated technical resources. In May 2019, we introduced the beta version of Demand Manager, a new service that makes it easy for sellers to deploy, configure, and optimize their own Prebid-based header bidding solutions. This tool allows sellers to more effectively monetize their inventory. We believe that adoption of these tools will further strengthen our relationship with sellers and contribute to our future revenue growth.
In an effort to capture more inventory for our buyers and deliver better monetization to our sellers, and to provide better transparency and predictability to all our clients, we made first price our default auction dynamic for header bidding transactions in 2018. This means that the first price or highest bid in our auction wins and that first price is passed to the downstream auction. To assist buyers in increasing advertising campaign returns and performance through the utilization of first price auction dynamics, we built and implemented an optional feature at no additional cost, which we call Estimated Market Rate ("EMR"). This feature uses algorithms that monitor existing market conditions against our dataset of auction outcomes to look for opportunities to reduce the amount of the bid that we pass through to the downstream auction on behalf of our winning bidder, while maintaining high fill rates. This is intended to help buyers bid on digital advertising inventory consistent with market values while preserving demand and budget for sellers on our platform. In addition to increasing the rate at which buyers win in our auctions, and the monetization that winning provides to sellers, our first price auction dynamic and EMR solution have contributed to higher CPMs, or cost per ad unit, for our header bidding inventory.
Supply Path Optimization, or SPO, refers to efforts by buyers to consolidate the number of vendors they work with to find the most effective and cost-efficient paths to procure media. This practice emerged in 2018 and continues to gain momentum in 2019. SPO is important to buyers because it can increase the proportion of their advertising that is ultimately spent on working media, with the goal of increasing return on their advertising spending, and can help them gain efficiencies by reducing the number of vendors they work with in a complex ecosystem. There are a number of criteria that buyers use to evaluate supply partners, including transparency, cost, quality of inventory, privacy standards, brand safety, and fraudulent traffic prevention policies. We believe we are well positioned to benefit from supply path optimization in the long run as a result of our broad inventory supply, buyer tools such as traffic shaping and EMR, which reduce the overall cost of working with us, our transparency, and our brand safety measures.
We began to see some pressure on CPMs in 2018 that continued into the first half of 2019 but has moderated and began to stabilize in the second quarter of 2019. We believe that CPM increases for publishers in 2017 and early 2018 were driven by header bidding and the move to first price auctions, but that large buyers have adapted to the new bidding environment and have improved their pricing algorithms, which lowered overall CPMs. We believe that better pricing has helped advertising campaigns' return on investment and is driving significant increases in the volume of paid impressions. In the future, CPMs may be negatively impacted as a result of privacy initiatives that drive a higher mix of contextual versus behavioral impressions being sold.
Ad tech exchange intermediaries like us have experienced market demands for greater transparency and reduced costs from all participants. The fees that we charge, or take rate, have been reduced significantly over the last several years. While we were able to increase take rates slightly over the course of 2018, we do not expect significant further increases in take rates.

Our take rate can be impacted by the type of advertising spend transacted on our platform, OMP or PMP, which carry different rates. OMP fees are higher than PMP, and our overall take rate could change depending on the mix. In addition, any discounts we negotiate with brands or agencies to consolidate spend in exchange for lower seller fees may also impact the average rate we are able to charge. If pressure for reduced costs continue, or if mix changes unfavorably, our revenue growth may be negatively impacted if we are not able to offset the related take rate reductions through increasing the volume of total advertising spend transacted on our platform.

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Revenue growth from our traditional desktop display business has benefited from year-over-year take rate increases. Lower industry growth rates in desktop will make growth of desktop revenue more challenging unless we are able to grow market share through SPO or the expansion of additional inventory. Our strategic focus is on growth areas—including mobile, video, PMPs, Demand Manager, and header bidding—that are expected to represent a majority of our revenue in future periods. However, despite our progress in mobile, our traditional desktop display business is expected to continue to represent a significant part of our revenue in the near term. Therefore, the mix of our desktop display business will continue to have a significant effect on our growth until our advertising spend mix has shifted more fully to growth areas.
Industry dynamics are challenging due to market and competitive pressures and make it difficult to predict the near-term effect of our growth initiatives. While we anticipate long-term benefits from these initiatives, unless we are able to continue to increase advertising spend on our platform, through higher transaction volumes or higher transaction values or both, our revenue growth may be limited.
Expense Reduction Initiatives    
In addition to strategic decisions made to reduce costs paid by our clients on our platform while growing revenue through transaction volume, we have also focused on the cost structure of our business to enable us to compete more effectively. We must operate efficiently to relieve the pressure on our margins and cash resources that has resulted from our price reductions undertaken in 2017, and to compensate for the ongoing investments in technology and data processing capabilities required to support the increased volume of transactions that our growth plans require. As part of these efforts, during the first quarter of 2018 we undertook measures to reduce headcount by approximately 100 people, or 19% of our workforce, and to reduce other operating costs. Our actions included reductions in administrative staff to bring our general and administrative operations into better alignment with the current size of the business, as well as in sales and technical personnel as a result of offshoring certain development functions, organizational delayering and restructuring, and reducing investment in unprofitable projects. We are continuously evaluating our costs and pursuing additional cost-control and efficiency opportunities, including increased automation, across all aspects of the Company. However, we anticipate significant increases in ad request volume in 2019, and are developing internal tools to manage the volume increases and investing in software architectural improvements, filtering, and cloud services to accelerate innovation and further enable efficiencies.
Uncertainty Resulting from Privacy Regulations
Our business is highly susceptible to emerging privacy regulations and oversight. In Europe, data protection authorities have started to clarify certain requirements under the European General Data Protection Regulation, or GDPR, but uncertainty remains.    
In addition to GDPR, there are a number of new privacy regulations that are expected to come into effect in 2020. Last year, California passed the California Consumer Privacy Act, which imposes new obligations on businesses that handle the personal information of California residents. The obligations imposed on the Company remain unclear due to ambiguities in the drafting. These ambiguities and resulting impact on our business will need to be resolved over time. In addition, other privacy bills have been introduced at both the state and federal level. Certain international territories are also imposing new or expanded privacy obligations, including Brazil. In the coming years, we expect further consumer privacy regulation worldwide.  
Until prevailing compliance practices standardize, the impact of the GDPR and other privacy regulations on our business and, consequently, our revenue could be negatively impacted.
Components of Our Results of Operations
We report our financial results as one operating segment. Our consolidated operating results, together with non-GAAP financial measures, are regularly reviewed by our chief operating decision maker, principally to make decisions about how we allocate our resources and to measure our consolidated operating performance.
Revenue
We generate revenue from the purchase and sale of digital advertising inventory through our marketplace. We recognize revenue upon the fulfillment of our contractual obligations in connection with a completed transaction, subject to satisfying all other revenue recognition criteria. Our revenue recognition policies are discussed in more detail within Note 3 of the accompanying Notes to the Condensed Consolidated Financial Statements.

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Expenses
We classify our expenses into the following categories:
Cost of Revenue. Our cost of revenue consists primarily of data center costs, bandwidth costs, depreciation and maintenance expense of hardware supporting our revenue-producing platform, amortization of software costs for the development of our revenue-producing platform, amortization expense associated with acquired developed technologies, personnel costs, facilities-related costs, and cloud computing costs. Personnel costs included in cost of revenue include salaries, bonuses, stock-based compensation, and employee benefit costs, and are primarily attributable to personnel in our network operations group who support our platform. We capitalize costs associated with software that is developed or obtained for internal use and amortize the costs associated with our revenue-producing platform in cost of revenue over their estimated useful lives. We amortize acquired developed technologies over their estimated useful lives.
Sales and Marketing. Our sales and marketing expenses consist primarily of personnel costs, including stock-based compensation and the sales bonuses paid to our sales organization, as well as marketing expenses such as brand marketing, travel expenses, trade shows and marketing materials, professional services, and amortization expense associated with client relationships and backlog from our business acquisitions, and to a lesser extent, facilities-related costs and depreciation and amortization. Our sales organization focuses on increasing the adoption of our solution by existing and new buyers and sellers. We amortize acquired intangibles associated with client relationships and backlog from our business acquisitions over their estimated useful lives.
Technology and Development. Our technology and development expenses consist primarily of personnel costs, including stock-based compensation and bonuses, as well as professional services associated with the ongoing development and maintenance of our solution, and to a lesser extent, facilities-related costs and depreciation and amortization, including amortization expense associated with acquired intangible assets from our business acquisitions that are related to technology and development functions. These expenses include costs incurred in the development, implementation, and maintenance of internal use software, including our platform and related infrastructure. Technology and development costs are expensed as incurred, except to the extent that such costs are associated with internal use software development that qualifies for capitalization, which are then recorded as internal use software development costs, net, on our condensed consolidated balance sheet. We amortize internal use software development costs that relate to our revenue-producing activities on our platform to cost of revenue and amortize other internal use software development costs to technology and development costs or general and administrative expenses, depending on the nature of the related project. We amortize acquired intangibles associated with technology and development functions from our business acquisitions over their estimated useful lives.
General and Administrative. Our general and administrative expenses consist primarily of personnel costs, including stock-based compensation and bonuses, associated with our executive, finance, legal, human resources, compliance, and other administrative personnel, as well as accounting and legal professional services fees, facilities-related costs and depreciation and amortization, and other corporate-related expenses. General and administrative expenses also include amortization of internal use software development costs and acquired intangible assets from our business acquisitions over their estimated useful lives that relate to general and administrative functions.
Restructuring and Other Exit Costs. Our restructuring and other exit costs consist primarily of employee termination costs, including stock-based compensation charges.
Other (Income), Expense
Interest (Income) Expense, Net. Interest income consists of interest earned on our cash equivalents and marketable securities. Interest expense is mainly related to our credit facility and was insignificant for the six months ended June 30, 2019 and 2018.
Other Income. Other income consists primarily of rental income from commercial office space we hold under lease and have sublet to other tenants.
Foreign Currency Exchange (Gain) Loss, Net. Foreign currency exchange (gain) loss, net consists primarily of gains and losses on foreign currency transactions. We have foreign currency exposure related to our accounts receivable and accounts payable that are denominated in currencies other than the U.S. Dollar, principally the British Pound and the Euro.
Provision (Benefit) for Income Taxes
Provision (benefit) for income taxes consists of federal, state, and foreign income taxes and is primarily the result of the release of a foreign valuation allowance resulting from a change to a cost-plus arrangement for a foreign subsidiary, the domestic valuation allowance, and the tax liability associated with foreign subsidiaries. Due to uncertainty as to the realization of benefits from the predominant portion of our domestic and international net deferred tax assets, including net operating loss carryforwards and research and development tax credits, we have a full valuation allowance reserved against such net deferred tax assets. We intend to continue to maintain a full valuation allowance on our deferred tax assets until there is sufficient evidence to support the

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reversal of all or some portion of these allowances. Release of the valuation allowance would result in the recognition of certain net deferred tax assets and a decrease to income tax expense or recognition of a benefit for the period the release is recorded. However, the exact timing and amount of the valuation allowance release are subject to change on the basis of the level of profitability that we are able to achieve.

Results of Operations
The following table sets forth our condensed consolidated results of operations:
 
Three Months Ended
 
Favorable/(Unfavorable) %
 
Six Months Ended
 
Favorable/(Unfavorable) %
 
June 30, 2019
 
June 30, 2018
 
 
June 30, 2019
 
June 30, 2018
 
 
(in thousands)
 
 
 
(in thousands)
 
 
Revenue
$
37,870

 
$
28,648

 
32
 %
 
$
70,286

 
$
53,524

 
31
 %
Expenses (1)(2):
 
 
 
 
 
 
 
 
 
 
 
Cost of revenue
15,085

 
15,044

 
—
 %
 
30,201

 
29,827

 
(1
)%
Sales and marketing
11,519

 
11,135

 
(3
)%
 
22,111

 
23,392

 
5
 %
Technology and development
9,839

 
9,245

 
(6
)%
 
19,555

 
19,739

 
1
 %
General and administrative
10,027

 
11,441

 
12
 %
 
20,307

 
23,985

 
15
 %
Restructuring and other exit costs
—

 
974

 
100
 %
 
—

 
3,440

 
100
 %
Total expenses
46,470

 
47,839

 
3
 %
 
92,174

 
100,383

 
8
 %
Loss from operations
(8,600
)
 
(19,191
)
 
55
 %
 
(21,888
)
 
(46,859
)
 
53
 %
Other income, net
(403
)
 
(1,281
)
 
(69
)%
 
(437
)
 
(1,208
)
 
(64
)%
Loss before income taxes
(8,197
)
 
(17,910
)
 
54
 %
 
(21,451
)
 
(45,651
)
 
53
 %
Provision (benefit) for income taxes
84

 
74

 
(14
)%
 
(624
)
 
149

 
NM

Net loss
$
(8,281
)
 
$
(17,984
)
 
54
 %
 
$
(20,827
)
 
$
(45,800
)
 
55
 %
NM - Not Meaningful
(1) Stock-based compensation expense included in our expenses was as follows:
 
 
 
 
 
Three Months Ended
 
Six Months Ended
 
June 30, 2019
 
June 30, 2018
 
June 30, 2019
 
June 30, 2018
 
(in thousands)
 
(in thousands)
Cost of revenue
$
106

 
$
77

 
$
198

 
$
184

Sales and marketing
1,459

 
1,158

 
2,804

 
2,343

Technology and development
1,166

 
623

 
2,225

 
1,472

General and administrative
2,064

 
2,402

 
3,937

 
4,759

Restructuring and other exit costs
—

 
352

 
—

 
398

Total stock-based compensation expense
$
4,795

 
$
4,612

 
$
9,164

 
$
9,156

(2) Depreciation and amortization expense included in our expenses was as follows:
 
 
 
 
 
Three Months Ended
 
Six Months Ended
 
June 30, 2019
 
June 30, 2018
 
June 30, 2019
 
June 30, 2018
 
(in thousands)
 
(in thousands)
Cost of revenue
$
7,758

 
$
8,353

 
$
15,803

 
$
16,514

Sales and marketing
113

 
151

 
238

 
314

Technology and development
178

 
227

 
374

 
468

General and administrative
125

 
147

 
399

 
292

Total depreciation and amortization expense
$
8,174

 
$
8,878

 
$
16,814

 
$
17,588


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The following table sets forth our condensed consolidated results of operations for the specified periods as a percentage of our revenue for those periods presented:
 
Three Months Ended
 
Six Months Ended
 
June 30, 2019
 
June 30, 2018
 
June 30, 2019
 
June 30, 2018
Revenue
100
 %
 
100
 %
 
100
 %
 
100
 %
Cost of revenue
40

 
53

 
43

 
56

Sales and marketing
30

 
39

 
31

 
44

Technology and development
26

 
32

 
28

 
37

General and administrative
27

 
40

 
29

 
45

Restructuring and other exit costs
—

 
3

 
—

 
6

Total expenses
123

 
167

 
131

 
188

Loss from operations
(23
)
 
(67
)
 
(31
)
 
(88
)
Other income, net
(1
)
 
(4
)
 
—

 
(2
)
Loss before income taxes
(22
)
 
(63
)
 
(31
)
 
(86
)
Provision (benefit) for income taxes
—

 
—

 
(1
)
 
—

Net loss
(22
)%
 
(63
)%
 
(30
)%
 
(86)
 %
Comparison of the Three and Six Months Ended June 30, 2019 and 2018
Revenue
Revenue increased $9.2 million, or 32%, for the three months ended June 30, 2019 compared to the three months ended June 30, 2018. The increase was driven by increases in both advertising spend transacted on our platform and take rate, or the fee we earn on advertising spend.
For the six months ended June 30, 2019, revenue increased $16.8 million, or 31%, compared to the prior year period, primarily for the same reasons described above for the three month period.
Revenue is impacted by shifts in the mix of advertising spend by transaction type and channel, changes in the fees we charge for our services, and other factors such as changes in the market, our execution of the business, and competition. In addition, an increase in PMP transactions as a percentage of the transactions on our platform could also result in reduced revenue, if not offset by increased volume, because PMP transactions can carry lower fees than OMP transactions. As highlighted previously, in late 2018, we began to see some pressure on desktop CPMs, which carried over to mobile CPMs, as a result of buyer pricing tools and the impact from privacy initiatives, such as Apple’s ITP, that drive a higher mix of contextual versus behavioral impressions being sold. We believe that better pricing has helped advertising campaigns' return on investment and is driving significant increases in paid impressions. Industry dynamics are challenging due to market and competitive pressures and make it difficult to predict the near-term effect of our growth initiatives. While we anticipate long-term benefits from these initiatives, unless we are able to continue to increase advertising spend on our platform, through higher transaction volumes or higher transaction values or both, our revenue growth may be limited. We expect revenue to be higher in absolute dollars in 2019 compared to 2018 and to increase above first half revenue in the second half of 2019.
Cost of Revenue
Cost of revenue remained relatively flat for the three months ended June 30, 2019 compared to the three months ended June 30, 2018. For the six months ended June 30, 2019, cost of revenue increased $0.4 million, or 1%, compared to the prior year period.
We expect cost of revenue to be higher in absolute dollars in 2019 compared to 2018, and to increase in the second half of 2019, as a result of increased spending on data centers, serving costs, cloud computing costs, and technology to process the greater volumes of data and transactions we will need to grow revenue. Cost of revenue may fluctuate from quarter to quarter and period to period, on an absolute dollar basis and as a percentage of revenue, depending on revenue levels and the volume of transactions we process supporting those revenues, and the timing and amounts of depreciation and amortization of equipment and software. We are expanding select data center operations to cloud service providers to accelerate innovation and gain efficiencies, and we expect an increase in cost of revenue expenses as a result.

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Sales and Marketing
Sales and marketing expenses increased $0.4 million, or 3%, for the three months ended June 30, 2019 compared to the three months ended June 30, 2018, primarily due to an increase in personnel costs.
For the six months ended June 30, 2019, sales and marketing expenses decreased $1.3 million, or 5%, compared to the prior year period. The decrease was partially due to a decrease of $0.4 million in personnel costs as a result of our 2018 cost control initiatives for the six month comparative period. In addition, professional services and facilities related expenses each decreased $0.5 million compared to the prior year period.
We expect sales and marketing expenses to remain at similar levels in 2019 compared to 2018, and to increase slightly in the second half of 2019 above the first half level despite the continued benefit from cost reductions that were achieved in the second half of 2018, as described below. Sales and marketing expense may fluctuate quarter to quarter and period to period, on an absolute dollar basis and as a percentage of revenue, based on revenue levels, the timing of our investments and seasonality in our industry and business.
Technology and Development
Technology and development expenses increased by $0.6 million, or 6%, for the three months ended June 30, 2019 compared to the three months ended June 30, 2018, primarily due to an increase of $0.8 million in personnel costs.
For the six months ended June 30, 2019, technology and development expenses decreased $0.2 million, or 1%, compared to the prior year period.
We expect technology and development expense to increase in 2019 compared to 2018, with small increases in the upcoming quarters as we make a limited number of strategic headcount additions to focus on the engineering aspect of our new developments, including Demand Manager and other initiatives. The timing and amount of our capitalized development and enhancement projects may affect the amount of development costs expensed in any given period. As a percentage of revenue, technology and development expense may fluctuate from quarter to quarter and period to period based on revenue levels, the timing and amounts of these investments, the timing and the rate of the amortization of capitalized projects and the timing and amounts of future capitalized internal use software development costs.
General and Administrative  
General and administrative expenses decreased by $1.4 million, or 12%, for the three months ended June 30, 2019 compared to the three months ended June 30, 2018. The decrease is due to decreases of $0.5 million in personnel costs as a result of our 2018 cost control initiatives and $0.7 million in professional services expenses.
For the six months ended June 30, 2019, general and administrative expenses decreased $3.7 million, or 15%, compared to the prior year period, primarily due to a $2.5 million decrease in personnel costs as a result of our 2018 cost control initiatives. In addition, expenses related to professional services also decreased $1.2 million in the current year period.
We expect general and administrative expenses to decrease in 2019 compared to 2018, with a modest increase in the second half of 2019 compared to the first half of 2019, despite the continued benefit from cost reductions that were achieved in the second half of 2018, as described below. General and administrative expenses may fluctuate from quarter to quarter and period to period based on the timing and amounts of expenditures in our general and administrative functions as they vary in scope and scale over periods. Such fluctuations may not be directly proportional to changes in revenue.
Restructuring and Other Exit Costs
For the three and six months ended June 30, 2018, we incurred restructuring and other exit costs of $1.0 million and $3.4 million, respectively, for severance and other one-time employee termination benefits related to headcount reductions that were made in the first quarter of 2018 (see Note 8). There were no restructuring and other exit costs incurred during the three and six months ended June 30, 2019, and all remaining accrued costs associated with the 2018 restructuring events were paid in the first quarter of 2019.
As part of our on-going evaluation of efficiency and implementation of cost-control measures, during the first quarter of 2018 we undertook measures to reduce headcount by approximately 100 people, or 19% of our workforce, and to reduce other operating costs. Our actions included reductions in administrative staff to bring our general and administrative operations into better alignment with the current size of the business, as well as in sales and technical personnel as a result of offshoring certain development functions, organizational delayering and restructuring, and reducing investment in unprofitable projects.

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Other (Income) Expense, Net
 
Three Months Ended
 
Six Months Ended
 
June 30, 2019
 
June 30, 2018
 
June 30, 2019
 
June 30, 2018
 
(in thousands)
 
(in thousands)
Interest income, net
$
(214
)
 
$
(274
)
 
$
(407
)
 
$
(545
)
Other income
(46
)
 
(210
)
 
(188
)
 
(420
)
Foreign exchange (gain) loss, net
(143
)
 
(797
)
 
158

 
(243
)
Total other income, net
$
(403
)
 
$
(1,281
)
 
$
(437
)
 
$
(1,208
)
Foreign exchange (gain) loss, net is impacted by movements in exchange rates and the amount of foreign currency-denominated receivables and payables, which are impacted by our billings to buyers and payments to sellers. During the three and six months ended June 30, 2019, the net foreign exchange (gain) loss was primarily attributable to the currency movements between the British Pound and the Danish Krone relative to the U.S. Dollar.
Provision (Benefit) for Income Taxes     
We recorded an income tax expense of $0.1 million and an income tax benefit of $0.6 million for the three and six months ended June 30, 2019, respectively, and income tax expenses of $0.1 million for both the three and six months ended June 30, 2018. The tax provision for the three and six months ended June 30, 2019 is primarily the result of the release of a foreign valuation allowance resulting from a change to a cost-plus arrangement for a foreign subsidiary, the domestic valuation allowance, and the tax liability associated with foreign subsidiaries.
Liquidity and Capital Resources
Our principal sources of liquidity are our cash and cash equivalents, marketable securities, cash generated from operations, and our credit facility with Silicon Valley Bank ("SVB"). At June 30, 2019, we had cash and cash equivalents of $86.1 million, of which $14.6 million was held in foreign currency cash accounts. Our cash and marketable securities balances are affected by our results of operations, the timing of capital expenditures which are typically greater in the second half of the year, and by changes in our working capital, particularly changes in accounts receivable and accounts payable. The timing of cash receipts from buyers and payments to sellers can significantly impact our cash flows from operating activities and our liquidity for, and within, any period presented. Our collection and payment cycle can vary from period to period depending upon various circumstances, including seasonality.
In September 2018, we amended and restated our loan and security agreement with SVB (the "Loan Agreement"). The Loan Agreement provides a senior secured revolving credit facility of up to $40.0 million with a maturity date of September 26, 2020. Pursuant to the Loan Agreement, we are required to comply with financial covenants. While we are currently in compliance with these covenants, this could change in the future depending on our operating results.
At June 30, 2019, we had no amounts outstanding under our Loan Agreement with SVB. Future availability under the credit facility is dependent on several factors including the available borrowing base and compliance with future covenant requirements. See Note 12 of "Notes to Condensed Consolidated Financial Statements" for additional information regarding the Loan Agreement.
We believe our existing cash and cash equivalents and investment balances will be sufficient to meet our working capital requirements for at least the next twelve months from the issuance of our financial statements. However, there are multiple factors that could impact our cash balances in the future. For example, we typically collect from buyers in advance of payments to sellers, and our collection and payment cycle can vary from period to period depending upon various circumstances, including seasonality. Some buyers have been demanding longer terms to pay us later and some sellers have been demanding shorter terms to collect from us earlier. We may not have the leverage to resist these demands given the competitive nature of our business. If this continues, more of our cash will be required to fund our payment cycle and therefore not available for other uses. Some buyers have also began experiencing financial difficulty and have been forced into filing for bankruptcy protection, and we may be forced to pay sellers even if we are unable to collect from buyers. Our future capital requirements and the adequacy of available funds will depend on many factors, including those set forth in Part II, Item 1A: "Risk Factors" of our Annual Report on Form 10-K for the year ended December 31, 2018 and in Part II, Item 1A of our subsequent Quarterly Reports on Form 10-Q.
Our ability to renew our existing credit facility, which matures in September 2020, or to enter into a new credit facility to replace or supplement the existing facility may be limited due to various factors, including the status of our business, global credit market conditions, and perceptions of our business or industry by sources of financing. In particular, it may be difficult to renew or replace our existing credit facility if we are not able to demonstrate a path to consistently produce positive cash flow. In

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addition, even if credit is available, lenders may seek more restrictive covenants and higher interest rates that may reduce our borrowing capacity, increase our costs, and reduce our operating flexibility.
In the future, we may attempt to raise additional capital through the sale of equity securities or through equity-linked or debt financing arrangements. If we raise additional funds by issuing equity or equity-linked securities, the ownership of our existing stockholders will be diluted. If we raise additional financing by incurring indebtedness, we will be subject to increased fixed payment obligations and could also be subject to restrictive covenants, such as limitations on our ability to incur additional debt, and other operating restrictions that could adversely impact our ability to conduct our business. Any future indebtedness we incur may result in terms that could be unfavorable to equity investors.
An inability to raise additional capital could adversely affect our ability to achieve our business objectives. In addition, if our operating performance during the next twelve months is below our expectations, our liquidity and ability to operate our business could be adversely affected.
Cash Flows
The following table summarizes our cash flows for the periods presented:
 
Six Months Ended
 
June 30, 2019
 
June 30, 2018
 
(in thousands)
Cash flows provided by (used in) operating activities
$
5,533

 
$
(21,090
)
Cash flows provided by investing activities
1,128

 
17,212

Cash flows used in financing activities
(987
)
 
(470
)
Effects of exchange rate changes on cash, cash equivalents and restricted cash
(15
)
 
(47
)
Change in cash, cash equivalents and restricted cash
$
5,659

 
$
(4,395
)
Operating Activities
Our cash flows from operating activities are primarily driven by revenues generated from advertising activity, offset by the cash costs of operations, and significantly influenced by increases or decreases in receipts from buyers and related payments to sellers. Our future cash flows will be diminished if we cannot increase our revenue levels and manage costs appropriately. Cash flows from operating activities have been further affected by changes in our working capital, particularly changes in accounts receivable and accounts payable. The timing of cash receipts from buyers and payments to sellers can significantly impact our cash flows from operating activities for any period presented.
For the six months ended June 30, 2019, net cash provided by operating activities was $5.5 million compared to net cash used in operating activities of $21.1 million for the six months ended June 30, 2018. Our operating activities included our net losses of $20.8 million and $45.8 million for the six months ended June 30, 2019 and 2018, respectively, which were offset by non-cash adjustments of $26.6 million and $26.0 million, respectively. In the first half of 2019, net changes in our working capital reduced cash provided by operating activities by $0.3 million. Net cash used in operating activities for the first half of 2018 was increased by a net decrease in our working capital of $1.3 million. The net changes in working capital for both periods are primarily due to the timing of cash receipts from buyers and the timing of payments to sellers.
We believe that cash flows from operations will continue to be negatively impacted by our ongoing net losses and working capital needs.
Investing Activities
Our primary investing activities have consisted of investments in, and maturities of, available-for-sale securities, acquisitions of businesses, purchases of property and equipment, and capital expenditures to develop our internal use software in support of creating and enhancing our technology infrastructure. Purchases of property and equipment and investments in internal use software development may vary from period-to-period due to the timing of the expansion of our operations, changes to headcount, and the cycles of our internal use software development. As we execute on our strategy to be a high volume, low cost advertising exchange, we are developing solutions to manage the growth of our digital advertising inventory volume more efficiently. We anticipate investment in internal use software development to remain relatively consistent with past years' investment levels as we continue to innovate new solutions on our platform. As the business continues to grow, we expect our investment in property and equipment to slightly increase compared to 2018. Historically, a majority of our purchases in property and equipment have occurred in the latter half of the year in preparation for the peak volumes of the fourth quarter and early in the first quarter of the following year. We expect those trends to continue, with higher levels of property and equipment spend in

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the latter half of this year compared to the first half of the year. Investments in, and maturities of, available-for-sale securities and acquisitions of businesses vary from period-to-period.
During the six months ended June 30, 2019 and 2018, our investing activities provided net cash of $1.1 million and $17.2 million, respectively. For the six months ended June 30, 2019 and 2018, we had net maturities of investments in available-for-sale securities of $7.5 million and $17.2 million, respectively. In addition, we had cash inflows of $6.1 million during the six months ended June 30, 2018 related to sales of available-for-sale securities. These cash inflows were offset by purchases of property and equipment of $2.2 million and $1.2 million during the six months ended June 30, 2019 and 2018, respectively, and investments in our internally developed software of $4.2 million and $4.8 million, respectively.
Financing Activities
Our financing activities consisted of transactions related to the issuance of our common stock under our equity plans.
For the six months ended June 30, 2019 and 2018, we used net cash of $1.0 million and $0.5 million, respectively, for financing activities. Cash outflows from financing activities for the six months ended June 30, 2019 and 2018 included payments of $1.8 million and $0.7 million, respectively, for income tax deposits paid in respect of vesting of stock-based compensation awards that were reimbursed by the award recipients through surrender of shares.
Off-Balance Sheet Arrangements
We do not have any relationships with other entities or financial partnerships, such as entities often referred to as structured finance or special purpose entities that have been established for the purpose of facilitating off-balance sheet arrangements or other contractually narrow or limited purposes. We did not have any other off-balance sheet arrangements at June 30, 2019 other than the short-term operating leases and the indemnification agreements described below.
Contractual Obligations and Known Future Cash Requirements
Our principal commitments consist of leases for our various office facilities, including our corporate headquarters in Los Angeles, California, and operating lease agreements including data centers that expire at various times through 2026. At June 30, 2019, expected future commitments relating to operating leases associated with leases included in the lease liability and ROU asset on the condensed consolidated balance sheet were $16.6 million. See Note 11 of "Notes to Condensed Consolidated Financial Statements" for our lease commitment for each of the next five years and thereafter. In certain cases, the terms of the lease agreements provide for rental payments on a graduated basis. We received rental income from subleases totaling $46.2 thousand and $0.2 million for the three and six months ended June 30, 2019, respectively.
There were no significant changes to our unrecognized tax benefits in the six months ended June 30, 2019 and we do not expect to have any significant changes to unrecognized tax benefits through December 31, 2019.
In the ordinary course of business, we enter into agreements with sellers, buyers, and other third parties pursuant to which we agree to indemnify buyers, sellers, vendors, lessors, business partners, lenders, stockholders, and other parties with respect to certain matters, including, but not limited to, losses resulting from claims of intellectual property infringement, damages to property or persons, business losses, or other liabilities. Generally, these indemnity and defense obligations relate to our own business operations, obligations, and acts or omissions. However, under some circumstances, we agree to indemnify and defend contract counterparties against losses resulting from their own business operations, obligations, and acts or omissions, or the business operations, obligations, and acts or omissions of third parties. These indemnity provisions generally survive termination or expiration of the agreements in which they appear. In addition, we have entered into indemnification agreements with our directors, executive officers and certain other officers that will require us, among other things, to indemnify them against certain liabilities that may arise by reason of their status or service as directors, officers, or employees. No demands for indemnification have been made as of June 30, 2019.
Critical Accounting Policies and Estimates
Our condensed consolidated financial statements are prepared in accordance with GAAP. The preparation of these condensed consolidated financial statements requires us to make estimates and assumptions that affect the reported amounts of assets, liabilities, revenue, expenses, and related disclosures. We evaluate our estimates and assumptions on an ongoing basis. Our estimates are based on historical experience and various other assumptions that we believe to be reasonable under the circumstances. Our actual results could differ from these estimates.
We believe that the following assumptions and estimates have the greatest potential impact on our condensed consolidated financial statements: (i) the determination of revenue recognition as net versus gross in our revenue arrangements, (ii) internal-use software development costs, (iii) intangible asset impairment analysis, (iv) assumptions used in the valuation models to determine the fair value of stock options and stock-based compensation expense, (v) the assumptions used in the valuation of acquired assets and liabilities in business combinations, and (vi) income taxes, including the realization of tax assets and estimates of tax liabilities.

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There have been no significant changes in our accounting policies from those disclosed in our audited consolidated financial statements and notes thereto for the year ended December 31, 2018 included in our Annual Report on Form 10-K.
Our revenue recognition policy is further described below, which is consistent with the policy included in our Annual Report referenced above.
Revenue Recognition
We generate revenue from transactions where we provide a platform for the purchase and sale of digital advertising inventory. Our advertising automation solution is a marketplace that includes sellers of inventory (providers of websites, mobile applications and other digital media properties, and their representatives) and buyers of inventory (including advertisers, agencies, agency trading desks, and demand-side platforms). This solution incorporates proprietary machine-learning algorithms, sophisticated data processing, high-volume storage, detailed analytics capabilities, and a distributed infrastructure. Together, these features form the basis for our automated advertising solution that brings buyers and sellers together and facilitates intelligent decision-making and automated transaction execution for the digital advertising inventory managed on our platform. Digital advertising inventory is created when consumers access sellers’ content. Sellers provide digital advertising inventory to our platform in the form of advertising requests, or ad requests. When we receive ad requests from sellers, we send bid requests to buyers, which enable buyers to bid on sellers’ digital advertising inventory. Winning bids can create advertising, or paid impressions, for the seller to present to the consumer.
The total volume of spending between buyers and sellers on our platform is referred to as advertising spend. We keep a percentage of that advertising spend as a fee, and remit the remainder to the seller. The fee that we retain from the gross advertising spend on our platform is recognized as revenue. The fee earned on each transaction is based on the pre-existing agreement we have with the seller and the clearing price of the winning bid. We recognize revenue upon fulfillment of our performance obligation to a client, which occurs at the point in time an ad renders and is counted as a paid impression, subject to a contract existing with the client and a fixed or determinable transaction price. Performance obligations for all transactions are satisfied, and the corresponding revenue is recognized, at a distinct point in time; we have no arrangements with multiple performance obligations. We consider the following when determining if a contract exists (i) contract approval by all parties, (ii) identification of each party’s rights regarding the goods or services to be transferred, (iii) specified payment terms, (iv) commercial substance of the contract, and (v) collectability of substantially all of the consideration is probable.
We have determined that we do not act as the principal in the purchase and sale of digital advertising inventory because we are not the primary obligor and do not set prices agreed upon within the auction marketplace, and therefore we report revenue on a net basis.

Recently Issued Accounting Pronouncements
For information regarding recent accounting pronouncements, refer to Note 1 "Organization and Summary of Significant Accounting Policies" to our condensed consolidated financial statements included in this Quarterly Report on Form 10-Q.
Item 3. Quantitative and Qualitative Disclosure About Market Risk
This item is not required for smaller reporting companies.

Item 4. Controls and Procedures
Evaluation of Disclosure Controls and Procedures
Our management, with the participation of our Chief Executive Officer and Chief Financial Officer, evaluated the effectiveness of our disclosure controls and procedures as defined in Rule 13a-15(e) under the Exchange Act. Our disclosure controls and procedures are designed to provide reasonable assurance of achieving their objectives of ensuring that information we are required to disclose in the reports we file or submit under the Exchange Act is accumulated and communicated to our management, including our Chief Executive Officer and Chief Financial Officer, as appropriate to allow timely decisions regarding required disclosures, and is recorded, processed, summarized, and reported within the time periods specified in the SEC’s rules and forms. There is no assurance that our disclosure controls and procedures will operate effectively under all circumstances. Based upon the evaluation described above, our Chief Executive Officer and Chief Financial Officer concluded that, as of June 30, 2019, our disclosure controls and procedures were effective at the reasonable assurance level.

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Changes in Internal Control over Financial Reporting
There have been no changes in our internal control over financial reporting that occurred during the three months ended June 30, 2019 that have materially affected, or are reasonably likely to materially affect, our internal control over financial reporting.
Inherent Limitations on Effectiveness of Controls     
Management recognizes that a control system, no matter how well designed and operated, can provide only reasonable, not absolute, assurance that the objectives of the control system are met. Further, the design of a control system must reflect the fact that there are resource constraints and that management is required to apply its judgment in evaluating the benefits of possible controls and procedures relative to their costs. Because of the inherent limitations in all control systems, no evaluation of controls can provide absolute assurance that all control issues and instances of fraud or error, if any, have been detected. These inherent limitations include the realities that judgments in decision making can be faulty, and that breakdowns can occur because of a simple error or mistake. Additionally, controls can be circumvented by the individual acts of some persons, by collusion of two or more people, or by management override of the controls. The design of any system of controls also is based in part upon certain assumptions about the likelihood of future events, and there can be no assurance that any design will succeed in achieving its stated goals under all potential future conditions; over time, controls may become inadequate because of changes in conditions, or the degree of compliance with policies or procedures may deteriorate. Because of the inherent limitations in a cost-effective control system, misstatements due to error or fraud may occur and not be detected.

PART II. OTHER INFORMATION
Item 1. Legal Proceedings
We and our subsidiaries may from time to time be parties to legal or regulatory proceedings, lawsuits and other claims incident to our business activities and to our status as a public company. Such routine matters may include, among other things, assertions of contract breach or intellectual property infringement, claims for indemnity arising in the course of our business, regulatory investigations or enforcement proceedings, and claims by persons whose employment has been terminated. Such matters are subject to many uncertainties, and outcomes are not predictable with assurance. Consequently, we are unable to ascertain the ultimate aggregate amount of monetary liability, amounts which may be covered by insurance or recoverable from third parties, or the financial impact with respect to such matters as of June 30, 2019. However, based on our knowledge as of June 30, 2019, we believe that the final resolution of such matters pending at the time of this report, individually and in the aggregate, will not have a material adverse effect upon our condensed consolidated financial position, results of operations or cash flows.
Item 1A. Risk Factors
Investing in our common stock involves a high degree of risk. We describe risks associated with our business in Part I, Item 1A of our Annual Report on Form 10-K for the year ended December 31, 2018 (the "Risk Factors"). Each of the risks described in our Risk Factors may be relevant to decisions regarding an investment in or ownership of our stock. The occurrence of any such risks could have a significant adverse effect on our reputation, business, financial condition, revenue, results of operations, growth, or ability to accomplish our strategic objectives, and could cause the trading price of our common stock to decline. You should carefully consider such risks and the other information contained in this report, including our condensed consolidated financial statements and related notes and Management's Discussion and Analysis of Financial Condition and Results of Operations, before making investment decisions related to our common stock. There are no material changes to the Risk Factors of which we are currently aware; but our Risk Factors cannot anticipate and fully address all possible risks of investing in our common stock, the risks of investing in our common stock may change over time, and additional risks and uncertainties that we are not aware of, or that we do not consider to be material, may emerge. Accordingly, you are advised to consider additional sources of information and exercise your own judgment in addition to the information we provide.

Item 2. Unregistered Sales of Equity Securities and Use of Proceeds
(a) Recent Sales of Unregistered Securities
None.
(b) Use of Proceeds
Our initial public offering of common stock was effected through a Registration Statement on Form S-1 (File No.

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333-193739), which was declared effective on April 1, 2014. There has been no material change in the planned use of proceeds from our initial public offering as described in our final prospectus filed with the SEC pursuant to Rule 424(b) of the Securities Act and other periodic reports previously filed with the SEC.
(c) Purchases of Equity Securities by the Company and Affiliated Purchasers
We currently have no publicly announced repurchase plan or program.
Upon vesting of most restricted stock units or stock awards, we are required to deposit statutory employee withholding taxes on behalf of the holders of the vested awards. As reimbursement for these tax deposits, we have the option to withhold from shares otherwise issuable upon vesting a portion of those shares with a fair market value equal to the amount of the deposits we paid. Withholding of shares in this manner is accounted for as a repurchase of common stock. There were no repurchases of common stock during the three months ended June 30, 2019.

Item 6. Exhibits
Number
 
Description
 
 
 
3.1
 
3.2
 
31.1*
 
31.2*
 
32*(1)
 
101.ins *
 
Instance Document- the instance document does not appear in the Interactive Data File because its XBRL tags are embedded within the Inline XBRL document
101.sch *
 
XBRL Taxonomy Schema Linkbase Document
101.cal *
 
XBRL Taxonomy Calculation Linkbase Document
101.def *
 
XBRL Taxonomy Definition Linkbase Document
101.lab *
 
XBRL Taxonomy Label Linkbase Document
101.pre *
 
XBRL Taxonomy Presentation Linkbase Document
 
*    Filed herewith
(1) 
The information in this exhibit is furnished and deemed not filed with the Securities and Exchange Commission for purposes of section 18 of the Exchange Act of 1934, as amended (the "Exchange Act"), and is not to be incorporated by reference into any filing of The Rubicon Project, Inc. under the Securities Act of 1933, as amended (the "Securities Act"), or the Exchange Act, whether made before or after the date hereof, regardless of any general incorporation language in such filing.

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SIGNATURES
 
Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized.
 
 
THE RUBICON PROJECT, INC.
(Registrant)
 

/s/  David Day
 
David Day
 
Chief Financial Officer
(Principal Financial Officer)
Date July 31, 2019