Marin Software (MRIN) 10-Q/A 13 Nov 19 2019 Q3 Quarterly report (amended) Financial data

Document and Entity Information

Document and Entity Information - shares	9 Months Ended
	Sep. 30, 2019	Nov. 04, 2019
Cover [Abstract]
Entity Registrant Name	MARIN SOFTWARE INC
Entity Central Index Key	0001389002
Current Fiscal Year End Date	--12-31
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Shell Company	false
Entity Filer Category	Non-accelerated Filer
Entity Small Business	true
Entity Emerging Growth Company	false
Document Quarterly Report	true
Document Transition Report	false
Entity Common Stock, Shares Outstanding		6,644,000
Document Type	10-Q/A
Amendment Flag	true
Amendment Description	Marin Software Incorporated (the “Company”) is filing this Amendment No. 1 (“Amendment No. 1”) to its Quarterly Report on Form 10-Q filed on November 7, 2019, for the quarterly period ended September 30, 2019 (the “Original 10-Q”) to correct certain errors for the three months ended September 30, 2018 in the table under the caption “Adjusted EBITDA,” as presented in Part I, Item 2 “Management’s Discussion and Analysis of Financial Condition and Results of Operations” of the Original 10-Q.In accordance with applicable Securities and Exchange Commission rules and as required by Rule 12b-15 under the Securities Exchange Act of 1934, as amended, Amendment No. 1 includes new certifications from the Company’s Principal Executive Officer and Principal Financial Officer dated as of the date of filing of Amendment No. 1. Except as described above, no changes have been made to the Original Filing, and this Amendment No. 1 does not modify, amend or update in any way, any of the financial or other information contained in the Original Filing.
Document Period End Date	Sep. 30, 2019
Document Fiscal Year Focus	2019
Document Fiscal Period Focus	Q3
Entity File Number	001-35838
Entity Tax Identification Number	20-4647180
Entity Incorporation, State or Country Code	DE
Entity Address, Address Line One	123 Mission Street
Entity Address, Address Line Two	27th Floor
Entity Address, City or Town	San Francisco
Entity Address, State or Province	CA
Entity Address, Postal Zip Code	94105
City Area Code	415
Local Phone Number	399-2580
Title of 12(b) Security	Common Stock, $0.001 Par Value Per Share
Trading Symbol	MRIN
Security Exchange Name	NASDAQ

CONDENSED CONSOLIDATED BALANCE

CONDENSED CONSOLIDATED BALANCE SHEETS (Unaudited) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018	[1]
Current assets:
Cash and cash equivalents	$ 9,167	$ 10,210
Restricted cash	971	1,293
Accounts receivable, net	9,258	12,906
Prepaid expenses and other current assets	3,949	4,642
Total current assets	23,345	29,051
Property and equipment, net	9,763	11,815
Right-of-use assets, operating leases	8,641	0
Goodwill	1,868	1,943
Intangible assets, net	470	1,938
Other non-current assets	1,508	2,045
Total assets	45,595	46,792
Current liabilities:
Accounts payable	1,908	2,699
Accrued expenses and other current liabilities	10,721	10,632
Operating lease liabilities	4,294	0
Total current liabilities	16,923	13,331
Operating lease liabilities, non-current	5,696	0
Other long-term liabilities	2,098	4,090
Total liabilities	24,717	17,421
Commitments and contingencies (Note 13)
Stockholders’ equity:
Common stock, $0.001 par value - 142,857 shares authorized, 6,642 and 5,938 shares issued and outstanding at September 30, 2019 and December 31, 2018, respectively	7	6
Additional paid-in capital	298,553	295,116
Accumulated deficit	(276,595)	(264,713)
Accumulated other comprehensive loss	(1,087)	(1,038)
Total stockholders’ equity	20,878	29,371
Total liabilities and stockholders’ equity	$ 45,595	$ 46,792
[1]	Derived from the Company’s audited consolidated financial statements as of December 31, 2018.

CONDENSED CONSOLIDATED BALANC_2

CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) (Unaudited) - $ / shares shares in Thousands	Sep. 30, 2019	Dec. 31, 2018	[1]
Stockholders’ equity:
Common stock, par value (in dollars per share)	$ 0.001	$ 0.001
Common stock, authorized (in shares)	142,857	142,857
Common stock, issued (in shares)	6,642	5,938
Common stock, outstanding (in shares)	6,642	5,938
[1]	Derived from the Company’s audited consolidated financial statements as of December 31, 2018.

CONDENSED CONSOLIDATED STATEMEN

CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Revenues, net	$ 11,728	$ 13,153	$ 37,652	$ 42,806
Cost of revenues	5,567	6,459	17,307	20,994
Gross profit	6,161	6,694	20,345	21,812
Operating expenses
Sales and marketing	3,732	5,296	12,453	18,831
Research and development	3,872	5,471	13,427	17,443
General and administrative	2,631	2,921	8,129	10,064
Impairment of goodwill	0	14,740	0	14,740
Total operating expenses	10,235	28,428	34,009	61,078
Loss from operations	(4,074)	(21,734)	(13,664)	(39,266)
Other income, net	640	336	1,712	1,008
Loss before (benefit from) provision for income taxes	(3,434)	(21,398)	(11,952)	(38,258)
(Benefit from) provision for income taxes	(161)	96	(70)	624
Net loss	(3,273)	(21,494)	(11,882)	(38,882)
Foreign currency translation adjustments	(54)	(93)	(49)	(227)
Comprehensive loss	$ (3,327)	$ (21,587)	$ (11,931)	$ (39,109)
Net loss per share available to common stockholders, basic and diluted (Note 11)	$ (0.49)	$ (3.71)	$ (1.90)	$ (6.75)
Weighted-average shares used to compute net loss per share available to common stockholders, basic and diluted	6,631	5,787	6,262	5,763
Stock-based compensation expense	$ 653	$ 875	$ 2,100	$ 2,933
Amortization of intangible assets	468	598	1,468	1,939
Cost of Revenues [Member]
Operating expenses
Stock-based compensation expense	127	160	394	536
Amortization of intangible assets	234	234	702	704
Restructuring related expenses	0	37	6	176
Sales and Marketing [Member]
Operating expenses
Stock-based compensation expense	155	181	540	692
Amortization of intangible assets	0	130	64	527
Restructuring related expenses	0	113	223	658
Research and Development [Member]
Operating expenses
Stock-based compensation expense	266	339	816	992
Amortization of intangible assets	234	234	702	705
Restructuring related expenses	0	0	0	115
General and Administrative [Member]
Operating expenses
Stock-based compensation expense	105	195	350	713
Amortization of intangible assets	0	0	0	3
Restructuring related expenses	$ 0	$ 11	$ 0	$ 158

CONDENSED CONSOLIDATED STATEM_2

CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (Unaudited) - USD ($) shares in Thousands, $ in Thousands	Total		Common Stock [Member]	Additional Paid-in Capital [Member]	Accumulated Deficit [Member]	Accumulated Other Comprehensive Loss [Member]
Balances at beginning of period at Dec. 31, 2017	$ 62,783		$ 6	$ 291,163	$ (227,704)	$ (682)
Balances at beginning of period (in shares) at Dec. 31, 2017			5,729
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Impact of adoption of ASC 606 | ASC 606 [Member]	4,235		$ 0	0	4,235	0
Issuance of common stock from vesting of restricted stock units	0		$ 0	0	0	0
Issuance of common stock from vesting of restricted stock units (in shares)			30
Tax withholding related to vesting of restricted stock units	(137)		$ 0	(137)	0	0
Issuance of common stock under employee stock purchase plan	172		$ 0	172	0	0
Issuance of common stock under employee stock purchase plan (in shares)			31
Stock-based compensation expense	2,933		$ 0	2,933	0	0
Net loss	(38,882)		0	0	(38,882)	0
Foreign currency translation adjustments	(223)		0	4	0	(227)
Balances at end of period at Sep. 30, 2018	30,881		$ 6	294,135	(262,351)	(909)
Balances at end of period (in shares) at Sep. 30, 2018			5,790
Balances at beginning of period at Dec. 31, 2017	62,783		$ 6	291,163	(227,704)	(682)
Balances at beginning of period (in shares) at Dec. 31, 2017			5,729
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss	(41,244)
Balances at end of period at Dec. 31, 2018	29,371	[1]	$ 6	295,116	(264,713)	(1,038)
Balances at end of period (in shares) at Dec. 31, 2018			5,938
Balances at beginning of period at Jun. 30, 2018	51,611		$ 6	293,278	(240,857)	(816)
Balances at beginning of period (in shares) at Jun. 30, 2018			5,784
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock from vesting of restricted stock units	0		$ 0	0	0	0
Issuance of common stock from vesting of restricted stock units (in shares)			6
Tax withholding related to vesting of restricted stock units	(18)		$ 0	(18)	0	0
Stock-based compensation expense	875		0	875	0	0
Net loss	(21,494)		0	0	(21,494)	0
Foreign currency translation adjustments	(93)		0	0	0	(93)
Balances at end of period at Sep. 30, 2018	30,881		$ 6	294,135	(262,351)	(909)
Balances at end of period (in shares) at Sep. 30, 2018			5,790
Balances at beginning of period at Dec. 31, 2018	29,371	[1]	$ 6	295,116	(264,713)	(1,038)
Balances at beginning of period (in shares) at Dec. 31, 2018			5,938
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock through at-the-market offering, net of offering costs	$ 1,504		$ 1	1,503	0	0
Issuance of common stock through at-the-market offering, net of offering costs (in shares)	570		570
Issuance of common stock from vesting of restricted stock units	$ 0		$ 0	0	0	0
Issuance of common stock from vesting of restricted stock units (in shares)			92
Tax withholding related to vesting of restricted stock units	(254)		$ 0	(254)	0	0
Issuance of common stock under employee stock purchase plan	88		$ 0	88	0	0
Issuance of common stock under employee stock purchase plan (in shares)			42
Stock-based compensation expense	2,100		$ 0	2,100	0	0
Net loss	(11,882)		0	0	(11,882)	0
Foreign currency translation adjustments	(49)		0	0	0	(49)
Balances at end of period at Sep. 30, 2019	20,878		$ 7	298,553	(276,595)	(1,087)
Balances at end of period (in shares) at Sep. 30, 2019			6,642
Balances at beginning of period at Jun. 30, 2019	$ 23,555		$ 7	297,903	(273,322)	(1,033)
Balances at beginning of period (in shares) at Jun. 30, 2019			6,623
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock through at-the-market offering, net of offering costs (in shares)	0
Issuance of common stock from vesting of restricted stock units	$ 0		$ 0	0	0	0
Issuance of common stock from vesting of restricted stock units (in shares)			19
Tax withholding related to vesting of restricted stock units	(3)		$ 0	(3)	0	0
Stock-based compensation expense	653		0	653	0	0
Net loss	(3,273)		0	0	(3,273)	0
Foreign currency translation adjustments	(54)		0	0	0	(54)
Balances at end of period at Sep. 30, 2019	$ 20,878		$ 7	$ 298,553	$ (276,595)	$ (1,087)
Balances at end of period (in shares) at Sep. 30, 2019			6,642
[1]	Derived from the Company’s audited consolidated financial statements as of December 31, 2018.

CONDENSED CONSOLIDATED STATEM_3

CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (Unaudited) (Parenthetical) $ in Thousands	9 Months Ended
	Sep. 30, 2019USD ($)
Statement Of Stockholders Equity [Abstract]
Offering costs	$ 203

CONDENSED CONSOLIDATED STATEM_4

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018
Operating activities
Net loss	$ (11,882)	$ (38,882)
Adjustments to reconcile net loss to net cash provided by (used in) operating activities:
Impairment of goodwill	0	14,740
Depreciation	1,475	2,185
Amortization of internally developed software	2,762	2,871
Amortization of intangible assets	1,468	1,939
Loss on disposals of property and equipment and right-of-use assets	13	3
Amortization of deferred costs to obtain and fulfill contracts	1,240	1,624
Unrealized foreign currency gains	(52)	(12)
Stock-based compensation expense related to equity awards	2,100	2,933
Provision for bad debts	(47)	(194)
Net change in operating leases	(421)	0
Changes in operating assets and liabilities:
Accounts receivable	3,728	3,773
Prepaid expenses and other assets	1	(824)
Accounts payable	(774)	(751)
Accrued expenses and other liabilities	737	(181)
Net cash provided by (used in) operating activities	348	(10,776)
Investing activities
Purchases of property and equipment	(92)	(580)
Proceeds from disposals of property and equipment	0	3
Capitalization of internally developed software	(1,874)	(1,693)
Net cash used in investing activities	(1,966)	(2,270)
Financing activities
Proceeds from issuance of common shares through at-the-market offering, net of offering costs of $203	1,504	0
Payment of principal on finance lease liabilities	(986)	(971)
Employee taxes paid for withheld shares upon equity award settlement	(295)	(137)
Proceeds from employee stock purchase plan, net	123	249
Net cash provided by (used in) financing activities	346	(859)
Effect of foreign exchange rate changes on cash and cash equivalents and restricted cash	(93)	(242)
Net decrease in cash and cash equivalents and restricted cash	(1,365)	(14,147)
Cash and cash equivalents and restricted cash
Beginning of period	11,503	28,837
End of period	10,138	14,690
Supplemental disclosure of non-cash investing and financing activities
Purchases of property and equipment recorded in accounts payable and accrued expenses	318	2
Issuance of common stock under employee stock purchase plan	$ 88	$ 172

CONDENSED CONSOLIDATED STATEM_5

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) (Parenthetical) $ in Thousands	9 Months Ended
	Sep. 30, 2019USD ($)
Financing activities
Offering costs	$ 203

Summary of Business and Signifi

Summary of Business and Significant Accounting Policies	9 Months Ended
	Sep. 30, 2019
Accounting Policies [Abstract]
Summary of Business and Significant Accounting Policies	1. Summary of Business and Significant Accounting Policies Marin Software Incorporated (the “Company”) was incorporated in Delaware in March 2006. The Company provides enterprise marketing software for advertisers and agencies to integrate, align and amplify their digital advertising spend across the web and mobile devices. Offered as a unified software-as-a-service (“SaaS”) advertising management solution for search, social, eCommerce and display advertising, the Company’s platform helps digital marketers convert precise audiences, improve financial performance and make better decisions. The Company’s corporate headquarters are located in San Francisco, California, and the Company has additional offices in the following locations: Austin, Chicago, Dublin, London, New York, Paris, Portland, Shanghai and Tokyo. Liquidity The Company has incurred significant losses in each fiscal year since its incorporation in 2006, and management expects such losses to continue over the next several years. The Company incurred a net loss of $11,882 for the nine months ended September 30, 2019, and a net loss of $41,244 for the year ended December 31, 2018. As of September 30, 2019, the Company had an accumulated deficit of $276,595. The Company had cash, cash equivalents and restricted cash of $10,138 as of September 30, 2019. Management expects to incur additional losses and experience negative operating cash flows in the future. The Company’s ability to achieve its business objectives and to continue to meet its obligations is dependent upon maintaining a certain level of liquidity. To meet its liquidity objectives, the Company intends to raise additional capital through its equity distribution agreement, enter into other strategic agreements and continue to lower its operating costs through additional cost saving activities. If the Company is unable to raise sufficient additional capital or unable to consummate other strategic agreements, the Company may be required to initiate further cost savings activities through additional headcount reductions, such as the organizational restructuring initiated in 2018 (see Note 5). In March 2019, the Company filed a shelf registration statement with the Securities and Exchange Commission (“SEC”) that the SEC declared effective on May 10, 2019 and under which it may offer a variety of equity and debt securities with an aggregate offering price of up to $50,000. As part of that shelf registration statement, the Company entered into an equity distribution agreement with JMP Securities LLC (“JMP Securities”) under which it may sell shares of its common stock up to a gross aggregate offering price of $13,000 (Note 6). For the nine months ended September 30, 2019, the Company sold 570 shares of its common stock under this agreement for net proceeds of $1,504. The total amount of cash that may be generated under this equity distribution agreement is uncertain and depends on a variety of factors, including market conditions and the trading price of the Company’s common stock. The Company believes that its cash, cash equivalents and restricted cash will provide sufficient funds for the Company to continue as a going concern for at least 12 months from the date of issuance of these condensed consolidated financial statements. This determination is based on a number of factors, including projections that are predicated on the Company achieving certain levels of new bookings and customer renewals and operating cost savings primarily resulting from lower personnel costs. Basis of Presentation and Consolidation The accompanying unaudited condensed consolidated financial statements and condensed footnotes have been prepared in accordance with 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 U.S. generally accepted accounting principles (“GAAP”) for complete financial statements. In the opinion of management, all adjustments, consisting of only normal recurring items, considered necessary for fair statement have been included. The results of operations for the three and nine months ended September 30, 2019 are not necessarily indicative of the results to be expected for the year ending December 31, 2019, or for other interim periods or future years. The accompanying unaudited condensed consolidated financial statements include the accounts of the Company and its wholly-owned subsidiaries. All intercompany accounts and transactions have been eliminated in consolidation. The condensed consolidated balance sheet as of December 31, 2018 is derived from audited financial statements as of that date but does not include all of the information and footnotes required by GAAP for complete financial statements. These condensed consolidated financial statements should be read in conjunction with the consolidated financial statements and related notes included in the Company’s Annual Report on Form 10-K for the fiscal year ended December 31, 2018, filed with the SEC on March 14, 2019. Fair Value of Financial Instruments The Company’s financial instruments, including cash and cash equivalents, accounts receivable, accounts payable and accrued expenses are carried at amounts that approximate fair value due to the short-term nature of those instruments. Based on borrowing rates available to the Company for loans with similar terms and maturities and in consideration of the Company’s credit risk profile, the carrying value of outstanding lease liabilities (Note 9) approximates fair value as well. Allowances for Doubtful Accounts and Revenue Credits The allowance for doubtful accounts reflects the Company’s best estimate of probable losses inherent in the Company’s receivables portfolio based on historical experience, specific allowances for known troubled accounts and other available information. The Company does not require collateral from its customers, and it performs a regular review of its customers’ payment histories and associated credit risks. Certain contracts with advertising agencies contain sequential liability provisions, whereby the agency does not have an obligation to pay the Company until payment is received from the agency’s customers. In these circumstances, the Company evaluates the credit worthiness of the agency’s customers in addition to the agency itself. As of September 30, 2019 and December 31, 2018, the Company recorded an allowance for doubtful accounts of $1,891 and $2,651, respectively. From time to time, the Company provides credits to customers that typically relate to customer disputes or billing adjustments and are recorded as a reduction of revenue. Reserves for these revenue credits are accounted for as variable consideration under authoritative revenue recognition guidance (see Note 2) and are estimated based on historical credit activity. As of September 30, 2019, and December 31, 2018, the Company recorded an allowance for potential customer credits in the amount of $298 and $353, respectively. Goodwill Impairment Assessment The Company evaluates goodwill for impairment annually in the fourth quarter of its fiscal year, or more frequently if events or changes in circumstances indicate that goodwill may be impaired. For the purposes of impairment testing, the Company has determined that it has one reporting unit. The Company performs its goodwill impairment test using the simplified method, whereby the fair value of the reporting unit is compared to its carrying value. If the fair value of the reporting unit exceeds the carrying value of the net assets assigned to that reporting unit, goodwill is not considered impaired. If the carrying value of the net assets assigned to the reporting unit exceeds the fair value of the reporting unit, the goodwill is considered impaired by an amount equal to that difference. The Company previously recorded a goodwill impairment of $14,740 in the third quarter of 2018. Due to a sustained decline in the market capitalization of the Company’s common stock during the three months ended September 30, 2019, the Company performed an interim goodwill test. The Company determined that there was no impairment to the carrying value of goodwill as of September 30, 2019 as the fair value of the Company’s sole reporting unit was determined to be in excess of the net book value of the Company’s net assets. Long-Lived Assets Impairment Assessment The Company evaluates long-lived assets, excluding goodwill, for potential impairment whenever adverse events or changes in circumstances or business climate indicate that the expected undiscounted future cash flows related to such long-lived assets may not be sufficient to support the net book value of such assets. An impairment loss is recognized only if the carrying value of a long-lived asset or asset group is not recoverable and exceeds its fair value. The carrying value of a long-lived asset or asset group is not recoverable if it exceeds the sum of the undiscounted cash flows expected to result from the use and eventual disposition of the asset. There were no such impairment losses recorded in any of the periods presented. Revenue Recognition The Company generates revenues principally from subscriptions either directly with advertisers or with advertising agencies to its platform for the management of search, social, eCommerce and display advertising. The Company also generates revenues from strategic agreements with certain leading publishers. Under these strategic agreements, the Company receives consideration based on a percentage of the search advertising spend that customers manage on its platform. Revenues are recognized when control of these services is transferred to the Company’s customers, in an amount that reflects the consideration the Company expects to be entitled to in exchange for those services. See Note 2 for further discussion on the Company’s revenues. Recent Accounting Pronouncements Adopted in 2019 In February 2016, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) 2016-02, Leases As a result of the adoption, the Company recorded right-of-use (“ROU”) assets of $14,589 and lease liabilities of $16,425 related to operating leases on January 1, 2019. ASC 842 did not have a material impact on the Company’s condensed consolidated statement of comprehensive loss for the three and nine months ended September 30, 2019. Refer to Note 9 for further information on leases. In February 2018, the FASB issued ASU 2018-02, Income Statement – Reporting Comprehensive Income – Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income Recent Accounting Pronouncements Not Yet Effective In June 2016, the FASB issued ASU 2016-13, Financial Instruments – Credit Losses – Measurement of Credit Losses on Financial Instruments In August 2018, the FASB issued ASU 2018-13, Fair Value Measurement In August 2018, the FASB issued ASU 2018-15, Intangibles – Goodwill and Other – Internal-Use Software

Revenues

Revenues	9 Months Ended
	Sep. 30, 2019
Revenue From Contract With Customer [Abstract]
Revenues	2. Revenue Recognition The Company generates its revenues principally from subscriptions, either directly with advertisers or with advertising agencies, to its platform for the management of search, social, eCommerce and display advertising. It also generates a portion of its revenues from long-term strategic agreements with certain leading publishers. Revenues are recognized when control of these services is transferred to the Company’s customers in an amount that reflects the consideration the Company expects to be entitled to in exchange for those services. The Company determines revenue recognition through the following steps: • Identification of the contract, or contracts, with a customer; • Identification of the performance obligations in the contract; • Determination of the transaction price; • Allocation of the transaction price to the performance obligations in the contract; and • Recognition of revenue when, or as, the Company satisfies its performance obligations. Subscription The Company’s subscription contracts provide advertisers with access to the Company’s advertising management platform. Advertisers do not have the right to take possession of the software supporting the services at any time. These contracts are generally one year or less in length. The subscription fee under most contracts consists of the greater of a minimum monthly platform fee or variable consideration based on the volume of advertising spend managed through the Company’s platform at the contractual percentage of spend. The variable portion generally includes tiered pricing, whereby the percentage of spend charged decreases as the value of advertising spend increases. The tiered pricing resets monthly and is consistent throughout the contract term. The Company has concluded that this volume-based pricing approach does not constitute a future material right as the pricing tiers are consistent throughout the term of the contract and similar pricing is typically offered to similar classes of customers within the same geographical areas and markets. Certain subscription contracts consist of only a flat monthly platform fee. Subscription fees are generally invoiced on a monthly basis in arrears based on the actual amount of advertising spend managed on the platform. In certain limited circumstances, the Company will invoice an advertiser in advance for the contractual minimum monthly platform fee for a defined future period, which is typically three to 12 months. The Company’s subscription services comprise a single stand-ready performance obligation satisfied over time as the advertiser simultaneously receives and consumes the benefit from the Company’s performance. This performance obligation constitutes a series of services that are substantially the same in nature and are provided over time using the same measure of progress. Revenues derived from these arrangements are recognized over time using an output method based upon the passage of time as this provides a faithful depiction of the pattern of transfer of control. Fixed minimum monthly platform fees are recognized ratably over the contract term as the single performance obligation is satisfied. Variable fees are allocated to the distinct month of the series in which they are earned because the terms of the variable payments relate specifically to the outcome from transferring the distinct time increment (month) of service and because such amounts reflect the fees to which the Company expects to be entitled for providing access to the advertising management platform for that period, consistent with the allocation objective of authoritative revenue guidance under Accounting Standards Codification 606 (“ASC 606”). Strategic Agreements The Company has entered into long-term strategic agreements with certain leading search publishers. Under these strategic agreements, the Company receives consideration based on a percentage of the search advertising spend that its customers manage on its platform. These strategic agreements are generally billed on a quarterly basis. The majority of the Company’s strategic agreement revenue is concentrated in one revenue share agreement, executed with Google in December 2018, with an effective date of October 1, 2018 (the “Google Revenue Share Agreement”). Under the Google Revenue Share Agreement, which constitutes a single performance obligation, the Company receives both fixed and variable revenue share payments based on a percentage of the search advertising spend that is managed through the Company’s platform. The Google Revenue Share Agreement requires the Company to reinvest a specified percentage of these revenue share payments in its search technology platform to drive innovation. The performance obligation is expected to be satisfied ratably over the two-year contractual term using the output method based upon the passage of time, as Google simultaneously receives and consumes the benefit from the Company’s performance, which provides a faithful depiction of the pattern of transfer of control. The Google Revenue Share Agreement has a three-year term; however, after two years, Google may terminate the Google Revenue Share Agreement with no penalty if the Company does not meet certain financial metrics. Accordingly, the Company accounts for the Google Revenue Share Agreement as a two-year agreement with one optional renewal year. The Company evaluates the total amount of variable revenue share payments expected to be earned from the Google Revenue Share Agreement by using the expected value method, as it believes this method represents the most appropriate estimate for this consideration, based on historical service trends, the individual contract considerations and the Company’s best judgment. The Company includes estimates of variable consideration in revenues only to the extent that it believes it is probable that a significant reversal in the amount of cumulative revenue recognized will not occur when the uncertainty associated with the variable consideration is subsequently resolved. For the three and nine months ended September 30, 2019, the Company recognized $3,026 and $8,988, respectively, in revenues from the Google Revenue Share Agreement, including $45 related to performance obligations satisfied in previous periods. As of September 30, 2019, the Company expects to recognize revenues totaling approximately $2,980 for the remaining three months of 2019, and $8,940 for the year ending December 31, 2020, related to remaining performance obligations under the Google Revenue Share Agreement. Disaggregation of Revenues Revenues by geographic area, based on the billing location of the customer, were as follows for the periods presented: Three Months Ended September 30, Nine Months Ended September 30, 2019 2018 2019 2018 United States of America $ 8,802 $ 9,192 $ 28,135 $ 28,987 United Kingdom 1,312 1,755 4,340 5,877 Other (1) 1,614 2,206 5,177 7,942 Total revenues, net $ 11,728 $ 13,153 $ 37,652 $ 42,806 (1) No individual country within the “Other” category accounted for 10% or more of revenues, net for any period presented. Revenues by nature of services performed were as follows for the periods presented: Three Months Ended September 30, Nine Months Ended September 30, 2019 2018 2019 2018 Subscriptions $ 8,696 $ 12,884 $ 28,548 $ 41,795 Strategic agreements 3,032 269 9,104 1,011 Total revenues, net $ 11,728 $ 13,153 $ 37,652 $ 42,806 Contract Balances Accounts Receivable, Net The timing of revenue recognition may differ from the timing of invoicing to customers. Accounts receivable are recorded at the invoice amount, net of any allowances for doubtful accounts and revenue credits. A receivable is recognized in the period the Company provides the underlying services or when the right to consideration is unconditional. The balances of accounts receivable, net of the allowances for doubtful accounts and revenue credits, as of September 30, 2019 and December 31, 2018 are presented in the accompanying condensed consolidated balance sheets. Included in the balance of accounts receivable, net as of September 30, 2019 and December 31, 2018 was $3,874 and $3,867, respectively, related to the Google Revenue Share Agreement executed in December 2018, which represented 42% and 30%, respectively, of accounts receivable, net as of those dates. Customer Advances In certain situations, the Company receives cash payments from customers in advance of its performance of the underlying services. These services are contracted on a weekly basis and cash payments are generally received on a weekly basis at amounts that are at the discretion of the customers, based on established advertising budgets. The unused portion of these advances from customers is included within accrued expenses and other current liabilities on the accompanying condensed consolidated balance sheets. Under the Company’s terms of service, individual customer advances that are not used by the customer for a period of 180 days become the property of the Company. The Company recognizes advances from customers that have remained outstanding for this period of time as breakage revenues at the time the Company has received full consideration and has no remaining obligations to the customer. For the three and nine months ended September 30, 2019, the Company recognized $49 and $203, respectively, in breakage revenues from balances previously included in the customer advances account. For the three and nine months ended September 30, 2018, the Company recognized $34 and $156, respectively, in breakage revenues. Deferred Strategic Agreement Revenues Due to the timing of revenue recognition under the Google Revenue Share Agreement, the contractual billings exceed revenue recognized to date, resulting in a contract liability. As of September 30, 2019 and December 31, 2018, the Company recorded deferred strategic agreement revenues of $2,721 and $934, respectively, within accrued expenses and other current liabilities on the accompanying condensed consolidated balance sheets. Costs to Obtain and Fulfill Contracts The Company capitalizes certain contract acquisition costs, consisting primarily of commissions and related payroll taxes, when customer contracts are signed. The Company also capitalizes certain contract fulfillment costs, consisting primarily of the portion of the payroll and fringe benefits of the Company’s professional services team that relates directly to performing on-boarding and integration services for new and existing customers (collectively, “deferred costs to obtain and fulfill contracts”). The deferred costs to obtain and fulfill contracts are amortized over the expected period of benefit, which the Company has determined to be approximately 30 months. This expected period of benefit takes into consideration the duration of the Company’s customer contracts, historical contract renewal rates, the underlying technology and other factors. Amortization expense for deferred costs to obtain and fulfill contracts is included in sales and marketing expense and cost of sales, respectively, on the accompanying condensed consolidated statements of comprehensive loss. The Company classifies deferred costs to obtain and fulfill contracts as current or non-current based on the timing of when the related amortization expense is expected to be recognized. The current portion of these deferred costs is included in prepaid expenses and other current assets, while the non-current portion is included in other non-current assets on the accompanying condensed consolidated balance sheets. Changes in the balances of deferred costs to obtain and fulfill contracts during the nine months ended September 30, 2019 were as follows: Deferred Costs to Obtain Contracts Deferred Costs to Fulfill Contracts Balances at December 31, 2018 $ 1,413 $ 606 Costs deferred 342 146 Amortization (817 ) (423 ) Balances at September 30, 2019 $ 938 $ 329

Balance Sheet Components

Balance Sheet Components	9 Months Ended
	Sep. 30, 2019
Balance Sheet Components [Abstract]
Balance Sheet Components	3. The following table shows the components of property and equipment as of the dates presented: September 30, December 31, Estimated Useful Life 2019 2018 Software, including internally developed software 3 years $ 27,710 $ 25,518 Computer equipment 3 to 4 years 22,619 22,714 Finance lease ROU assets Shorter of useful life or lease term 5,067 5,067 Leasehold improvements Shorter of useful life or lease term 4,645 4,778 Office equipment, furniture and fixtures 3 to 5 years 1,987 2,140 Total property and equipment 62,028 60,217 Less: Accumulated depreciation and amortization (52,265 ) (48,402 ) Property and equipment, net $ 9,763 $ 11,815 Finance lease ROU assets consist of computer equipment and were previously included in the “Computer equipment” line in filings for periods prior to 2019. Depreciation and amortization of internally developed software for the nine months ended September 30, 2019 and 2018 was $4,237 and $5,056, respectively. The following table shows the components of accrued expenses and other current liabilities as of the dates presented: September 30, December 31, 2019 2018 Accrued salary and payroll-related expenses $ 2,972 $ 3,695 Deferred strategic agreement revenues 2,721 934 Accrued liabilities 1,983 1,249 Income taxes payable 636 883 Finance lease liabilities 777 866 Advanced billings 437 859 Customer advances 282 432 Sales and use tax payable 4 244 Deferred rent — 538 Other 909 932 Total accrued expenses and other current liabilities $ 10,721 $ 10,632

Goodwill and Intangible Assets

Goodwill and Intangible Assets	9 Months Ended
	Sep. 30, 2019
Goodwill And Intangible Assets Disclosure [Abstract]
Goodwill and Intangible Assets	4. The goodwill activity for the nine months ended September 30, 2019 consisted of the following: Balance at December 31, 2018 $ 1,943 Foreign currency translation adjustments (75 ) Balance at September 30, 2019 $ 1,868 Intangible assets consisted of the following as of the dates presented: September 30, December 31, Estimated Useful Life 2019 2018 Developed technology 5 to 6 years $ 9,910 $ 9,910 Customer relationships 4 years — 2,080 Total intangible assets 9,910 11,990 Less: accumulated amortization (9,440 ) (10,052 ) Intangible assets, net $ 470 $ 1,938 Customer relationships were fully amortized as of September 30, 2019. Amortization of intangible assets was $468 and $598 for the three months ended September 30, 2019 and 2018, respectively, and $1,468 and $1,939 for the nine months ended September 30, 2019 and 2018, respectively. Future estimated amortization of intangible assets as of September 30, 2019, is presented below: Remaining three months of 2019 $ 375 Year ending December 31, 2020 95 Total $ 470

Restructuring Activities

Restructuring Activities	9 Months Ended
	Sep. 30, 2019
Restructuring And Related Activities [Abstract]
Restructuring Activities	5. Restructuring Activities In January 2018, the Company initiated an organizational restructuring plan (the “2018 Restructuring Plan”) designed to reduce operating expenses in response to declines in revenues. The 2018 Restructuring Plan included a headcount reduction of approximately 13% of the Company’s workforce, the closure of certain leased facilities and the consolidation of space in the Company’s San Francisco headquarters. Actions pursuant to the 2018 Restructuring Plan are substantially complete, and further costs associated with this plan are not expected to be material in future periods. The Company initiated certain other organizational restructuring plans during 2018 that also aimed to reduce operating expenses and primarily consisted of further headcount reductions. For the three and nine months ended September 30, 2019, the Company recorded zero and $229, respectively, of restructuring-related expenses in connection with the 2018 Restructuring Plan, as well as other organizational restructuring plans, in the accompanying condensed consolidated statements of comprehensive loss. For the three and nine months ended September 30, 2018, the Company recorded $161 and $1,107, respectively, of restructuring-related expenses in connection with these restructuring plans in the accompanying condensed consolidated statements of comprehensive loss.

Shelf Registration Statement an

Shelf Registration Statement and At-the-Market Offering	9 Months Ended
	Sep. 30, 2019
Shelf Registration Statement And At The Market Offering [Abstract]
Shelf Registration Statement and At-the-Market Offering	6. On March 14, 2019, the Company filed a shelf registration statement on Form S-3 with the SEC, which was declared effective by the SEC on May 10, 2019 and enables the Company to offer its common stock, preferred stock, debt securities, warrants, subscription rights and units having an aggregate offering price of up to $50,000. As part of this shelf registration, the Company entered into an equity distribution agreement with JMP Securities, pursuant to which the Company may offer and sell shares of its common stock having an aggregate offering price of up to $13,000 through an at-the-market offering program administered by JMP Securities. The Company is not required to sell any securities under this offering program. JMP Securities is entitled to compensation of up to 5.0% of the gross proceeds from sales of the Company’s common stock pursuant to the equity distribution agreement. No shares were sold under this equity distribution agreement for the three months ended September 30, 2019. For the nine months ended September 30, 2019, the Company sold 570 shares of its common stock under this equity distribution agreement and received proceeds of $1,504, net of offering costs of $203, at a weighted average sales price of $3.00 per share. The amount of any future proceeds that may be realized from this equity distribution agreement depends on a variety of factors, including market conditions and the price of the Company’s common stock. As of September 30, 2019, the Company had common stock with an aggregate offering price of up to $11,293 available for issuance under the equity distribution agreement.

Equity Award Plans

Equity Award Plans	9 Months Ended
	Sep. 30, 2019
Equity Award Plans [Abstract]
Equity Award Plans	7. In April 2006, the Company’s Board of Directors (the “Board”) adopted and the stockholders approved the 2006 Stock Option Plan (“2006 Plan”), which provided for the grant of incentive and non-statutory stock options. In February 2013 the Board adopted and the stockholders approved the 2013 Equity Incentive Plan (“2013 Plan”), which became effective on March 21, 2013. At that time, the Company ceased to grant equity awards under the 2006 Plan. Under the 2013 Plan, 643 shares of common stock were originally reserved for issuance. Additionally, all reserved and unissued shares under the 2006 Plan are eligible for issuance under the 2013 Plan. The 2013 Plan authorizes the award of incentive and non-statutory stock options, restricted stock awards, stock appreciation rights, restricted stock units (“RSUs”), performance awards and stock bonuses to the Company’s employees, directors, consultants, independent contractors and advisors. On January 1 of each calendar year through 2023, the number of shares of common stock reserved under the 2013 Plan will automatically increase by an amount equal to 5% of the total outstanding shares as of the immediately preceding December 31, or such lesser number of shares as determined by the Board. Pursuant to terms of the 2013 Plan, the shares available for issuance increased by 297 shares of common stock on January 1, 2019. As of September 30, 2019, 708 shares of common stock were available for future grants under the 2013 Plan. Stock Options A summary of stock option activity under the 2006 Plan and 2013 Plan is as follows: Options Outstanding Number of Shares Weighted Average Exercise Price Per Share Weighted Average Remaining Contractual Term (in Years) Aggregate Intrinsic Value Balances at December 31, 2018 436 $ 29.01 6.79 $ — Options granted 128 4.00 9.62 — Options forfeited and cancelled (14 ) 62.96 — — Balances at September 30, 2019 550 22.33 6.95 — Options exercisable 356 31.09 5.80 — Options vested 356 31.09 5.80 — Options vested and expected to vest 527 23.04 6.85 — RSUs A summary of RSUs granted and unvested under the 2013 Plan is as follows: RSUs Outstanding Number of Shares Weighted Average Grant Date Fair Value Per Unit Granted and unvested at December 31, 2018 834 $ 7.99 RSUs granted 737 3.93 RSUs vested (92 ) 9.43 RSUs cancelled and withheld to cover taxes (366 ) 6.88 Granted and unvested at September 30, 2019 1,113 $ 5.54 Employee Stock Purchase Plan In February 2013, the Board and stockholders approved the 2013 Employee Stock Purchase Plan (“2013 ESPP”), under which 143 shares of common stock were originally reserved for issuance. The 2013 ESPP became effective on March 22, 2013. The 2013 ESPP generally provides for purchase periods each nine months with the purchase price for shares of common stock purchased under the 2013 ESPP is 85% of the lesser of the fair market value of the common stock on (1) the first trading day of the applicable offering period and (2) the last trading day of each purchase period in the applicable offering period. On January 1 of each calendar year following the first offering date, the number of shares reserved under the 2013 ESPP automatically increases by an amount equal to 1% of the total outstanding shares as of immediately preceding December 31, but not to exceed 100 shares. Pursuant to terms of the 2013 ESPP, the shares available for issuance increased by 59 shares on January 1, 2019. As of September 30, 2019, 171 shares were reserved for issuance under the 2013 ESPP. During the three and nine months ended September 30, 2019, zero and 42 shares, respectively, were issued under the 2013 ESPP. During the three and nine months ended September 30, 2018, zero and 31 shares, respectively, were issued under the 2013 ESPP.

Stock-Based Compensation

Stock-Based Compensation	9 Months Ended
	Sep. 30, 2019
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Stock-Based Compensation	8. Stock-Based Compensation For stock-based awards granted by the Company, stock-based compensation expense is measured at grant date based on the fair value of the award and is expensed over the requisite service period. The Company recorded stock-based compensation expense of $653 and $875 for the three months ended September 30, 2019 and 2018, respectively, and $2,100 and $2,933 for the nine months ended September 30, 2019 and 2018, respectively. Stock Options The Company uses the Black-Scholes option-pricing model to estimate the fair value of options. This model requires the input of highly subjective assumptions including the expected volatility, risk-free interest rate and the expected life of options. The Company used the following assumptions for its Black-Scholes option-pricing model for the periods presented (there were no stock options granted during the three months ended September 30, 2019 and 2018): Nine Months Ended September 30, 2019 2018 Dividend yield — — Expected volatility 66.4 % 55.9 % Risk-free interest rate 2.18 % 2.54 % Expected life of options (in years) 4.00 4.00 The Company estimates the expected volatility of its common stock and expected life of its stock options based on its own historical experience. The expected volatility reflects the actual historical volatility of the price of the Company’s common stock since it began trading publicly in March 2013. The expected life represents the period of time that stock options are expected to be outstanding, based on historical exercise and employee departure behavior. The Company has no history or expectation of paying cash dividends on its common stock. The risk-free interest rate is based on the U.S. Treasury yield for a term consistent with the expected life of the options in effect at the time of grant. There were no exercises of stock options during the three and nine months ended September 30, 2019 and 2018. Compensation expense, net of estimated forfeitures, is recognized ratably over the requisite service period. As of September 30, 2019, there was $478 of unrecognized compensation expense related to stock options, which is expected to be recognized over a weighted-average period of 1.8 years. RSUs As of September 30, 2019, there was $4,231 of unrecognized compensation expense, net of estimated forfeitures, related to RSUs, which is expected to be recognized over a weighted-average period of 2.5 years. The Company uses the fair market value of the underlying common stock on the dates of grant to determine the fair value of RSUs. Employee Stock Purchase Plan The Company estimates the fair value of purchase rights under the 2013 ESPP using the Black-Scholes valuation model. The fair value of each purchase right under the 2013 ESPP is estimated on the date of grant using the Black-Scholes option valuation model and the straight-line attribution approach with assumptions substantially similar to those used for the valuation of stock option awards, with the exception of the expected life. The expected life is estimated to be six months, which is consistent with the purchase periods under the 2013 ESPP.

Leases

Leases	9 Months Ended
	Sep. 30, 2019
Leases [Abstract]
Leases	9. Operating and Finance Leases The Company evaluates new contractual arrangements at inception to determine if the contract is or contains a lease. For any contracts that are or contain a lease, the Company determines the appropriate classification of each identified lease as operating or finance. For all identified leases, the Company records the related lease liabilities and ROU assets based on the future minimum lease payments over the lease term, which only includes options to renew the lease if it is reasonably certain that the Company will exercise that option. For leases with original terms of twelve months or less, the Company recognizes the lease expense as incurred and does not recognize lease liabilities and ROU assets. The Company has operating leases for corporate offices worldwide and for space at a data center. Additionally, the Company leases computer equipment through various finance leases. Lease liabilities are measured based on the future minimum lease payments discounted over the lease term. The Company uses the discount rate implicit in the lease whenever that rate is readily determinable. For leases where no such rate is determinable, the Company uses its incremental borrowing rate, or the rate of interest that Company would have to pay to borrow an amount equal to the lease payments, on a collateralized basis over a similar term and in a similar economic environment. As of September 30, 2019, the weighted-average rate used in discounting the lease liabilities for ROU operating and finance leases was 6.8% and 6.1%, respectively. Current and non-current operating lease liabilities are presented on the condensed consolidated balance sheet, while current finance lease liabilities are included in accrued expenses and other current liabilities, and non-current finance lease liabilities are included in other long-term liabilities on the condensed consolidated balance sheets. Balances classified as capital lease obligations under previous lease guidance are presented for all periods prior to the three and nine months ended September 30, 2019 to conform to the presentation of finance lease liabilities under ASC 842. ROU assets are measured based on the associated lease liabilities, adjusted for any lease incentives such as tenant improvement allowances. ROU assets for operating leases are presented as non-current assets on the condensed consolidated balance sheet, while ROU assets for finance leases are included within property and equipment, net. For operating leases, the Company recognizes the expense for lease payments on straight-line basis over the lease term. As of September 30, 2019, the weighted-average remaining lease term for ROU operating and finance leases was 2.4 years and 1.0 years, respectively. As of September 30, 2019, the Company had net operating lease ROU assets of $8,641. Operating lease costs, consisting primarily of rental expense, were approximately $1,943 and $5,869, respectively, for the three and nine months ended September 30, 2019, and $2,089 and $6,284, respectively, for the three and nine months ended September 30, 2018. Variable rent expense was not significant for the three and nine months ended September 30, 2019. In February 2019, the Company executed a new lease agreement for office space in Paris and exited its prior office space shortly thereafter. There were no material costs incurred associated with that exit. As part of the new lease, the Company was required to enter into an irrevocable $109 letter of credit. The cash used to secure the letter of credit has been classified as restricted cash on the accompanying condensed consolidated balance sheet. At various dates between August 2015 and October 2016, the Company entered into finance lease arrangements with two separate manufacturers for computer equipment. These finance leases are collateralized by the underlying computer equipment. As of September 30, 2019, the Company had net finance lease ROU assets of $720. Finance lease ROU assets are included in property and equipment on the condensed consolidated balance sheets. Interest expense associated with finance leases is included within other income, net, on the accompanying condensed consolidated statements of comprehensive loss. Finance lease costs for the three and nine months ended September 30, 2019 consisted of $184 and $545, respectively, in depreciation of the leased assets, and $13 and $55, respectively, in interest expense. Costs associated with capital leases for the three and nine months ended September 30, 2018 consisted of $221 and $725, respectively, in depreciation of the leased assets, and $34 and $116, respectively, in interest expense. The maturities of operating lease and finance lease liabilities as of September 30, 2019 are as follows: Operating Leases Finance Leases 2019 (remaining three months) $ 2,006 $ 278 2020 3,657 552 2021 3,306 12 2022 1,844 — Total lease payments 10,813 842 Less: Amount representing imputed interest (823 ) (29 ) Present value of lease liabilities 9,990 813 Less: Current portion of lease liabilities (4,294 ) (777 ) Non-current portion of lease liabilities $ 5,696 $ 36 Supplemental cash flow information related to operating leases was as follows: Nine Months Ended September 30, 2019 Cash paid for amounts included in the measurement of lease liabilities: Financing cash flows from finance leases $ 986 Operating cash flows from finance leases 61 Operating cash flows from operating leases 6,317 ROU assets obtained in exchange for lease liabilities: Finance lease liabilities $ — Operating lease liabilities 812 The operating lease ROU asset obtained relates to the Paris office lease executed in February 2019, as well as a new Dublin office lease executed in May 2019. Subleases The Company subleases portions of its San Francisco and Portland office spaces. In August 2018, the Company entered into agreements to (a) extend its existing sublease for a portion of its San Francisco office space through July 2022, and (b) sublease an additional 14,380 square feet of its San Francisco office space to an unrelated third party through July 2020, with a subtenant option to extend the sublease through July 2022. The Company’s sublease for its Portland office space is with an unrelated third party and expires in May 2020. Income from these sublease agreements is included in other income, net, on the accompanying condensed consolidated statements of comprehensive loss. Sublease income for the three and nine months ended September 30, 2019 was $570 and $1,711, respectively, and for the three and nine months ended September 30, 2018 was $366 and $920, respectively. Future minimum amounts due under subleases as of September 30, 2019 were as follows: Operating Sublease Income 2019 (remaining three months) $ 569 2020 1,768 2021 1,105 2022 616 Total amounts due under subleases $ 4,058

Income Taxes

Income Taxes	9 Months Ended
	Sep. 30, 2019
Income Tax Disclosure [Abstract]
Income Taxes	10. Income Taxes The Company’s quarterly benefit from or provision for income taxes is based on an estimated effective annual income tax rate, and it also includes the tax impact of certain unusual or infrequently occurring items, if any. These may include changes in judgment about valuation allowances and effects of changes in tax laws or rates in the interim period in which they occur. Income tax benefit for the three and nine months ended September 30, 2019 was $161 and $70, respectively, on pre-tax losses of $3,434 and $11,952, respectively. As of September 30, 2019, the income tax rate varies from the federal income tax rate primarily due to valuation allowances in the United States and taxable income generated by the Company’s foreign wholly-owned subsidiaries. The Company reviews the likelihood that it will realize the benefit of its deferred tax assets and, therefore, the need for valuation allowances on a quarterly basis. There is no income tax benefit recognized with respect to losses incurred and no income tax expense recognized with respect to earnings generated in jurisdictions with a valuation allowance. This causes variability in the Company’s effective tax rate. The Company will maintain the valuation allowances until it is more likely than not that the net deferred tax assets will be realized. Tax positions taken by the Company are subject to audits by multiple tax jurisdictions. The Company believes that it has provided adequate reserves for its uncertain tax positions for all tax years still open for assessment. The Company also believes that it does not have any tax position for which it is not reasonably possible that the total amounts of uncertain tax positions will significantly increase or decrease within the next year. For the three and nine months ended September 30, 2019 and 2018, the Company did not recognize any material interest or penalties related to uncertain tax positions.

Net Loss Per Share Available to

Net Loss Per Share Available to Common Stockholders	9 Months Ended
	Sep. 30, 2019
Earnings Per Share [Abstract]
Net Loss Per Share Available to Common Stockholders	11. Basic net loss per share of common stock is calculated by dividing the net loss available to common stockholders by the weighted-average number of shares of common stock outstanding for the period. Diluted net loss per share of common stock is computed by dividing the net loss using the weighted-average number of shares of common stock, excluding common stock subject to repurchase, and, if dilutive, potential shares of common stock outstanding during the period. Basic and diluted net loss per share is the same for all periods presented, as the impact of all potentially dilutive outstanding securities was anti-dilutive. The following table presents the calculation of basic and diluted net loss per share for the periods presented: Three Months Ended September 30, Nine Months Ended September 30, 2019 2018 2019 2018 Numerator: Net loss available to common stockholders $ (3,273 ) $ (21,494 ) $ (11,882 ) $ (38,882 ) Denominator: Weighted average number of shares, basic and diluted 6,631 5,787 6,262 5,763 Net loss per share available to common stockholders Basic and diluted net loss per common share available to common stockholders $ (0.49 ) $ (3.71 ) $ (1.90 ) $ (6.75 ) The following table presents the potential shares of common stock outstanding that were excluded from the computation of diluted net loss per share available to common stockholders for the periods presented because including them would have been anti-dilutive: Three and Nine Months Ended September 30, 2019 2018 Options to purchase common stock 550 512 Unvested RSUs 1,113 977 Total 1,663 1,489

Segment Reporting

Segment Reporting	9 Months Ended
	Sep. 30, 2019
Segment Reporting [Abstract]
Segment Reporting	12. The Company defines the term “chief operating decision maker” to be the Chief Executive Officer. The Chief Executive Officer reviews the financial information presented on a consolidated basis for purposes of allocating resources and evaluating of financial performance. Accordingly, the Company has determined that it operates as a single reporting and operating segment.

Commitments and Contingencies

Commitments and Contingencies	9 Months Ended
	Sep. 30, 2019
Commitments And Contingencies Disclosure [Abstract]
Commitments and Contingencies	13. Commitments and Contingencies Legal Matters From time to time, the Company may be involved in lawsuits, claims, investigations and proceedings, consisting of intellectual property, commercial, employment and other matters, which arise in the ordinary course of business. In accordance with GAAP, the Company records a liability when it is both probable that a liability has been incurred and the amount of the loss can be reasonably estimated. These provisions are reviewed at least quarterly and adjusted to reflect the impact of negotiations, settlements, ruling, advice of legal counsel and other information and events pertaining to a particular case. Litigation is inherently unpredictable. If any unfavorable ruling was to occur in any specific period or if a loss becomes probable and estimable, there exists the possibility of a material adverse impact on the Company’s results of operations, financial position or cash flows. As of September 30, 2019, no material amounts are recorded related to legal proceedings on the unaudited condensed consolidated balance sheet. Indemnification The Company enters into standard indemnification agreements in the ordinary course of business. Pursuant to the agreements, each party may indemnify, defend and hold the other party harmless with respect to such claim, suit or proceeding brought against it by a third party alleging that the indemnifying party’s intellectual property infringes upon the intellectual property of the third party, or results from a breach of the indemnifying party’s representations and warranties or covenants, or that results from any acts of negligence or willful misconduct. The term of these indemnification agreements is generally perpetual any time after execution of the agreement. The maximum potential amount of future payments the Company could be required to make under these indemnification agreements is unlimited. Historically, the Company has not been obligated to make significant payments for these obligations and no liabilities have been recorded on the unaudited condensed consolidated balance sheet as of September 30, 2019 and the audited consolidated balance sheet as of December 31, 2018. The Company also indemnifies its officers and directors for certain events or occurrences, subject to certain limits, while the officer or director is or was serving at the Company’s request in such capacity. The maximum amount of potential future indemnification is unlimited; however, the Company has a directors and officers insurance policy that enables the Company to recover a portion of any future amounts paid. Historically, the Company has not been obligated to make any payments for these obligations and no liabilities have been recorded as of September 30, 2019 and December 31, 2018. Other Contingencies The Company is subject to claims and assessments from time to time in the ordinary course of business. The Company’s management does not believe that any such matters, individually or in the aggregate, will have a material adverse effect on the Company’s financial position, results of operations or cash flows.

Summary of Business and Signi_2

Summary of Business and Significant Accounting Policies (Policies)	9 Months Ended
	Sep. 30, 2019
Accounting Policies [Abstract]
Liquidity	Liquidity The Company has incurred significant losses in each fiscal year since its incorporation in 2006, and management expects such losses to continue over the next several years. The Company incurred a net loss of $11,882 for the nine months ended September 30, 2019, and a net loss of $41,244 for the year ended December 31, 2018. As of September 30, 2019, the Company had an accumulated deficit of $276,595. The Company had cash, cash equivalents and restricted cash of $10,138 as of September 30, 2019. Management expects to incur additional losses and experience negative operating cash flows in the future. The Company’s ability to achieve its business objectives and to continue to meet its obligations is dependent upon maintaining a certain level of liquidity. To meet its liquidity objectives, the Company intends to raise additional capital through its equity distribution agreement, enter into other strategic agreements and continue to lower its operating costs through additional cost saving activities. If the Company is unable to raise sufficient additional capital or unable to consummate other strategic agreements, the Company may be required to initiate further cost savings activities through additional headcount reductions, such as the organizational restructuring initiated in 2018 (see Note 5). In March 2019, the Company filed a shelf registration statement with the Securities and Exchange Commission (“SEC”) that the SEC declared effective on May 10, 2019 and under which it may offer a variety of equity and debt securities with an aggregate offering price of up to $50,000. As part of that shelf registration statement, the Company entered into an equity distribution agreement with JMP Securities LLC (“JMP Securities”) under which it may sell shares of its common stock up to a gross aggregate offering price of $13,000 (Note 6). For the nine months ended September 30, 2019, the Company sold 570 shares of its common stock under this agreement for net proceeds of $1,504. The total amount of cash that may be generated under this equity distribution agreement is uncertain and depends on a variety of factors, including market conditions and the trading price of the Company’s common stock. The Company believes that its cash, cash equivalents and restricted cash will provide sufficient funds for the Company to continue as a going concern for at least 12 months from the date of issuance of these condensed consolidated financial statements. This determination is based on a number of factors, including projections that are predicated on the Company achieving certain levels of new bookings and customer renewals and operating cost savings primarily resulting from lower personnel costs.
Basis of Presentation and Consolidation	Basis of Presentation and Consolidation The accompanying unaudited condensed consolidated financial statements and condensed footnotes have been prepared in accordance with 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 U.S. generally accepted accounting principles (“GAAP”) for complete financial statements. In the opinion of management, all adjustments, consisting of only normal recurring items, considered necessary for fair statement have been included. The results of operations for the three and nine months ended September 30, 2019 are not necessarily indicative of the results to be expected for the year ending December 31, 2019, or for other interim periods or future years. The accompanying unaudited condensed consolidated financial statements include the accounts of the Company and its wholly-owned subsidiaries. All intercompany accounts and transactions have been eliminated in consolidation. The condensed consolidated balance sheet as of December 31, 2018 is derived from audited financial statements as of that date but does not include all of the information and footnotes required by GAAP for complete financial statements. These condensed consolidated financial statements should be read in conjunction with the consolidated financial statements and related notes included in the Company’s Annual Report on Form 10-K for the fiscal year ended December 31, 2018, filed with the SEC on March 14, 2019.
Fair Value of Financial Instruments	Fair Value of Financial Instruments The Company’s financial instruments, including cash and cash equivalents, accounts receivable, accounts payable and accrued expenses are carried at amounts that approximate fair value due to the short-term nature of those instruments. Based on borrowing rates available to the Company for loans with similar terms and maturities and in consideration of the Company’s credit risk profile, the carrying value of outstanding lease liabilities (Note 9) approximates fair value as well.
Allowances for Doubtful Accounts and Revenue Credits	Allowances for Doubtful Accounts and Revenue Credits The allowance for doubtful accounts reflects the Company’s best estimate of probable losses inherent in the Company’s receivables portfolio based on historical experience, specific allowances for known troubled accounts and other available information. The Company does not require collateral from its customers, and it performs a regular review of its customers’ payment histories and associated credit risks. Certain contracts with advertising agencies contain sequential liability provisions, whereby the agency does not have an obligation to pay the Company until payment is received from the agency’s customers. In these circumstances, the Company evaluates the credit worthiness of the agency’s customers in addition to the agency itself. As of September 30, 2019 and December 31, 2018, the Company recorded an allowance for doubtful accounts of $1,891 and $2,651, respectively. From time to time, the Company provides credits to customers that typically relate to customer disputes or billing adjustments and are recorded as a reduction of revenue. Reserves for these revenue credits are accounted for as variable consideration under authoritative revenue recognition guidance (see Note 2) and are estimated based on historical credit activity. As of September 30, 2019, and December 31, 2018, the Company recorded an allowance for potential customer credits in the amount of $298 and $353, respectively.
Goodwill Impairment Assessment	Goodwill Impairment Assessment The Company evaluates goodwill for impairment annually in the fourth quarter of its fiscal year, or more frequently if events or changes in circumstances indicate that goodwill may be impaired. For the purposes of impairment testing, the Company has determined that it has one reporting unit. The Company performs its goodwill impairment test using the simplified method, whereby the fair value of the reporting unit is compared to its carrying value. If the fair value of the reporting unit exceeds the carrying value of the net assets assigned to that reporting unit, goodwill is not considered impaired. If the carrying value of the net assets assigned to the reporting unit exceeds the fair value of the reporting unit, the goodwill is considered impaired by an amount equal to that difference. The Company previously recorded a goodwill impairment of $14,740 in the third quarter of 2018. Due to a sustained decline in the market capitalization of the Company’s common stock during the three months ended September 30, 2019, the Company performed an interim goodwill test. The Company determined that there was no impairment to the carrying value of goodwill as of September 30, 2019 as the fair value of the Company’s sole reporting unit was determined to be in excess of the net book value of the Company’s net assets.
Long-Lived Assets Impairment Assessment	Long-Lived Assets Impairment Assessment The Company evaluates long-lived assets, excluding goodwill, for potential impairment whenever adverse events or changes in circumstances or business climate indicate that the expected undiscounted future cash flows related to such long-lived assets may not be sufficient to support the net book value of such assets. An impairment loss is recognized only if the carrying value of a long-lived asset or asset group is not recoverable and exceeds its fair value. The carrying value of a long-lived asset or asset group is not recoverable if it exceeds the sum of the undiscounted cash flows expected to result from the use and eventual disposition of the asset. There were no such impairment losses recorded in any of the periods presented.
Revenue Recognition	Revenue Recognition The Company generates revenues principally from subscriptions either directly with advertisers or with advertising agencies to its platform for the management of search, social, eCommerce and display advertising. The Company also generates revenues from strategic agreements with certain leading publishers. Under these strategic agreements, the Company receives consideration based on a percentage of the search advertising spend that customers manage on its platform. Revenues are recognized when control of these services is transferred to the Company’s customers, in an amount that reflects the consideration the Company expects to be entitled to in exchange for those services. See Note 2 for further discussion on the Company’s revenues.
Recent Accounting Pronouncements Adopted in 2019	Recent Accounting Pronouncements Adopted in 2019 In February 2016, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) 2016-02, Leases As a result of the adoption, the Company recorded right-of-use (“ROU”) assets of $14,589 and lease liabilities of $16,425 related to operating leases on January 1, 2019. ASC 842 did not have a material impact on the Company’s condensed consolidated statement of comprehensive loss for the three and nine months ended September 30, 2019. Refer to Note 9 for further information on leases. In February 2018, the FASB issued ASU 2018-02, Income Statement – Reporting Comprehensive Income – Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income
Recent Accounting Pronouncements Not Yet Effective	Recent Accounting Pronouncements Not Yet Effective In June 2016, the FASB issued ASU 2016-13, Financial Instruments – Credit Losses – Measurement of Credit Losses on Financial Instruments In August 2018, the FASB issued ASU 2018-13, Fair Value Measurement In August 2018, the FASB issued ASU 2018-15, Intangibles – Goodwill and Other – Internal-Use Software

Revenues (Tables)

Revenues (Tables)	9 Months Ended
	Sep. 30, 2019
Revenue From Contract With Customer [Abstract]
Disaggregation of Revenues	Revenues by geographic area, based on the billing location of the customer, were as follows for the periods presented: Three Months Ended September 30, Nine Months Ended September 30, 2019 2018 2019 2018 United States of America $ 8,802 $ 9,192 $ 28,135 $ 28,987 United Kingdom 1,312 1,755 4,340 5,877 Other (1) 1,614 2,206 5,177 7,942 Total revenues, net $ 11,728 $ 13,153 $ 37,652 $ 42,806 (1) No individual country within the “Other” category accounted for 10% or more of revenues, net for any period presented. Revenues by nature of services performed were as follows for the periods presented: Three Months Ended September 30, Nine Months Ended September 30, 2019 2018 2019 2018 Subscriptions $ 8,696 $ 12,884 $ 28,548 $ 41,795 Strategic agreements 3,032 269 9,104 1,011 Total revenues, net $ 11,728 $ 13,153 $ 37,652 $ 42,806
Changes in Balances of Deferred Costs to Obtain and Fulfill Contracts	Changes in the balances of deferred costs to obtain and fulfill contracts during the nine months ended September 30, 2019 were as follows: Deferred Costs to Obtain Contracts Deferred Costs to Fulfill Contracts Balances at December 31, 2018 $ 1,413 $ 606 Costs deferred 342 146 Amortization (817 ) (423 ) Balances at September 30, 2019 $ 938 $ 329

Balance Sheet Components (Table

Balance Sheet Components (Tables)	9 Months Ended
	Sep. 30, 2019
Balance Sheet Components [Abstract]
Components of Property and Equipment	The following table shows the components of property and equipment as of the dates presented: September 30, December 31, Estimated Useful Life 2019 2018 Software, including internally developed software 3 years $ 27,710 $ 25,518 Computer equipment 3 to 4 years 22,619 22,714 Finance lease ROU assets Shorter of useful life or lease term 5,067 5,067 Leasehold improvements Shorter of useful life or lease term 4,645 4,778 Office equipment, furniture and fixtures 3 to 5 years 1,987 2,140 Total property and equipment 62,028 60,217 Less: Accumulated depreciation and amortization (52,265 ) (48,402 ) Property and equipment, net $ 9,763 $ 11,815
Components of Accrued Expenses and Other Current Liabilities	The following table shows the components of accrued expenses and other current liabilities as of the dates presented: September 30, December 31, 2019 2018 Accrued salary and payroll-related expenses $ 2,972 $ 3,695 Deferred strategic agreement revenues 2,721 934 Accrued liabilities 1,983 1,249 Income taxes payable 636 883 Finance lease liabilities 777 866 Advanced billings 437 859 Customer advances 282 432 Sales and use tax payable 4 244 Deferred rent — 538 Other 909 932 Total accrued expenses and other current liabilities $ 10,721 $ 10,632

Goodwill and Intangible Assets

Goodwill and Intangible Assets (Tables)	9 Months Ended
	Sep. 30, 2019
Goodwill And Intangible Assets Disclosure [Abstract]
Activity of Goodwill	The goodwill activity for the nine months ended September 30, 2019 consisted of the following: Balance at December 31, 2018 $ 1,943 Foreign currency translation adjustments (75 ) Balance at September 30, 2019 $ 1,868
Summary of Intangible Assets	Intangible assets consisted of the following as of the dates presented: September 30, December 31, Estimated Useful Life 2019 2018 Developed technology 5 to 6 years $ 9,910 $ 9,910 Customer relationships 4 years — 2,080 Total intangible assets 9,910 11,990 Less: accumulated amortization (9,440 ) (10,052 ) Intangible assets, net $ 470 $ 1,938
Schedule of Future Estimated Amortization of Intangible Assets	Future estimated amortization of intangible assets as of September 30, 2019, is presented below: Remaining three months of 2019 $ 375 Year ending December 31, 2020 95 Total $ 470

Equity Award Plans (Tables)

Equity Award Plans (Tables)	9 Months Ended
	Sep. 30, 2019
Equity Award Plans [Abstract]
Summary of Stock Option Activity	A summary of stock option activity under the 2006 Plan and 2013 Plan is as follows: Options Outstanding Number of Shares Weighted Average Exercise Price Per Share Weighted Average Remaining Contractual Term (in Years) Aggregate Intrinsic Value Balances at December 31, 2018 436 $ 29.01 6.79 $ — Options granted 128 4.00 9.62 — Options forfeited and cancelled (14 ) 62.96 — — Balances at September 30, 2019 550 22.33 6.95 — Options exercisable 356 31.09 5.80 — Options vested 356 31.09 5.80 — Options vested and expected to vest 527 23.04 6.85 —
Summary of RSUs Granted and Unvested	A summary of RSUs granted and unvested under the 2013 Plan is as follows: RSUs Outstanding Number of Shares Weighted Average Grant Date Fair Value Per Unit Granted and unvested at December 31, 2018 834 $ 7.99 RSUs granted 737 3.93 RSUs vested (92 ) 9.43 RSUs cancelled and withheld to cover taxes (366 ) 6.88 Granted and unvested at September 30, 2019 1,113 $ 5.54

Stock-Based Compensation (Table

Stock-Based Compensation (Tables)	9 Months Ended
	Sep. 30, 2019
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Assumptions for Black-Scholes Option-Pricing Model	The Company used the following assumptions for its Black-Scholes option-pricing model for the periods presented (there were no stock options granted during the three months ended September 30, 2019 and 2018): Nine Months Ended September 30, 2019 2018 Dividend yield — — Expected volatility 66.4 % 55.9 % Risk-free interest rate 2.18 % 2.54 % Expected life of options (in years) 4.00 4.00

Leases (Tables)

Leases (Tables)	9 Months Ended
	Sep. 30, 2019
Leases [Abstract]
Maturities of Lease Liabilities	The maturities of operating lease and finance lease liabilities as of September 30, 2019 are as follows: Operating Leases Finance Leases 2019 (remaining three months) $ 2,006 $ 278 2020 3,657 552 2021 3,306 12 2022 1,844 — Total lease payments 10,813 842 Less: Amount representing imputed interest (823 ) (29 ) Present value of lease liabilities 9,990 813 Less: Current portion of lease liabilities (4,294 ) (777 ) Non-current portion of lease liabilities $ 5,696 $ 36
Supplemental Cash Flow Information Related to Leases	Supplemental cash flow information related to operating leases was as follows: Nine Months Ended September 30, 2019 Cash paid for amounts included in the measurement of lease liabilities: Financing cash flows from finance leases $ 986 Operating cash flows from finance leases 61 Operating cash flows from operating leases 6,317 ROU assets obtained in exchange for lease liabilities: Finance lease liabilities $ — Operating lease liabilities 812
Future Minimum Amounts Due Under Subleases	Future minimum amounts due under subleases as of September 30, 2019 were as follows: Operating Sublease Income 2019 (remaining three months) $ 569 2020 1,768 2021 1,105 2022 616 Total amounts due under subleases $ 4,058

Net Loss Per Share Available _2

Net Loss Per Share Available to Common Stockholders (Tables)	9 Months Ended
	Sep. 30, 2019
Earnings Per Share [Abstract]
Schedule of Calculation of Basic and Diluted Net Loss Per Share	The following table presents the calculation of basic and diluted net loss per share for the periods presented: Three Months Ended September 30, Nine Months Ended September 30, 2019 2018 2019 2018 Numerator: Net loss available to common stockholders $ (3,273 ) $ (21,494 ) $ (11,882 ) $ (38,882 ) Denominator: Weighted average number of shares, basic and diluted 6,631 5,787 6,262 5,763 Net loss per share available to common stockholders Basic and diluted net loss per common share available to common stockholders $ (0.49 ) $ (3.71 ) $ (1.90 ) $ (6.75 )
Schedule of Potential Common Stock Outstanding Excluded from Computation of Diluted Net Loss Per Share	The following table presents the potential shares of common stock outstanding that were excluded from the computation of diluted net loss per share available to common stockholders for the periods presented because including them would have been anti-dilutive: Three and Nine Months Ended September 30, 2019 2018 Options to purchase common stock 550 512 Unvested RSUs 1,113 977 Total 1,663 1,489

Summary of Business and Signi_3

Summary of Business and Significant Accounting Policies - Additional Information (Details) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2019USD ($)shares	Sep. 30, 2018USD ($)	Sep. 30, 2019USD ($)Reportingunitshares	Sep. 30, 2018USD ($)	Dec. 31, 2018USD ($)		Jan. 01, 2019USD ($)	Dec. 31, 2017USD ($)
Summary Of Significant Accounting Policies [Line Items]
Net loss	$ (3,273)	$ (21,494)	$ (11,882)	$ (38,882)	$ (41,244)
Accumulated deficit	(276,595)		(276,595)		(264,713)	[1]
Cash, cash equivalents and restricted cash	$ 10,138	14,690	10,138	14,690	11,503			$ 28,837
Net proceeds from common stock sold			$ 1,504
Common stock sold under agreement | shares	0		570
Allowance for doubtful accounts	$ 1,891		$ 1,891		2,651
Allowance for potential customer revenue credits	298		$ 298		353
Number of reporting unit | Reportingunit			1
Impairment of goodwill	0	$ 14,740	$ 0	$ 14,740
Right-of-use assets	8,641		8,641		$ 0	[1]
Lease liability	9,990		9,990
ASU 2016-02 [Member]
Summary Of Significant Accounting Policies [Line Items]
Right-of-use assets							$ 14,589
Lease liability							$ 16,425
Maximum [Member]
Summary Of Significant Accounting Policies [Line Items]
Aggregate offering price	50,000		50,000
JMP Securities [Member] | Maximum [Member]
Summary Of Significant Accounting Policies [Line Items]
Aggregate offering price	$ 13,000		$ 13,000
[1]	Derived from the Company’s audited consolidated financial statements as of December 31, 2018.

Revenues - Additional Informati

Revenues - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018
Disaggregation Of Revenue [Line Items]
Subscription contracts term			1 year
Revenues	$ 11,728	$ 13,153	$ 37,652	$ 42,806
Individual customer advances refund claim period			180 days
Breakage revenues	49	$ 34	$ 203	$ 156
Deferred strategic agreement revenues	2,721		$ 2,721		$ 934
Deferred costs expected period of benefit			30 months
Google [Member]
Disaggregation Of Revenue [Line Items]
Strategic agreement term			2 years
Strategic agreement term, optional renewal term			1 year
Revenues	3,026		$ 8,988
Remaining performance obligation	45		45
Accounts receivable	$ 3,874		$ 3,874		$ 3,867
Google [Member] | Accounts Receivable [Member] | Customer Concentration Risk [Member]
Disaggregation Of Revenue [Line Items]
Percentage of concentration risk			42.00%		30.00%
Minimum [Member]
Disaggregation Of Revenue [Line Items]
Advance advertiser invoicing period			3 months
Maximum [Member]
Disaggregation Of Revenue [Line Items]
Advance advertiser invoicing period			12 months
Maximum [Member] | Google [Member]
Disaggregation Of Revenue [Line Items]
Strategic agreement term			3 years

Revenues - Additional Informa_2

Revenues - Additional Information (Details1) - Google [Member] $ in Thousands	Sep. 30, 2019USD ($)
Disaggregation Of Revenue [Line Items]
Remaining performance obligation	$ 45
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2019-10-01
Disaggregation Of Revenue [Line Items]
Remaining performance obligation	$ 2,980
Remaining performance obligation, satisfaction period	3 months
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2020-01-01
Disaggregation Of Revenue [Line Items]
Remaining performance obligation	$ 8,940
Remaining performance obligation, satisfaction period	1 year

Revenues - Revenues, Disaggrega

Revenues - Revenues, Disaggregation of Revenues (Details) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Disaggregation Of Revenue [Line Items]
Revenues		$ 11,728	$ 13,153	$ 37,652	$ 42,806
Subscriptions [Member]
Disaggregation Of Revenue [Line Items]
Revenues		8,696	12,884	28,548	41,795
Strategic Agreements [Member]
Disaggregation Of Revenue [Line Items]
Revenues		3,032	269	9,104	1,011
United States of America [Member]
Disaggregation Of Revenue [Line Items]
Revenues		8,802	9,192	28,135	28,987
United Kingdom [Member]
Disaggregation Of Revenue [Line Items]
Revenues		1,312	1,755	4,340	5,877
Other [Member]
Disaggregation Of Revenue [Line Items]
Revenues	[1]	$ 1,614	$ 2,206	$ 5,177	$ 7,942
[1]	No individual country within the “Other” category accounted for 10% or more of revenues, net for any period presented.

Revenues - Changes in Balances

Revenues - Changes in Balances of Deferred Costs to Obtain and Fulfill (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2019USD ($)
Deferred Costs to Obtain Contracts [Member]
Capitalized Contract Cost [Line Items]
Balance at beginning of period	$ 1,413
Costs deferred	342
Amortization	(817)
Balance at end of period	938
Deferred Costs to Fulfill Contracts [Member]
Capitalized Contract Cost [Line Items]
Balance at beginning of period	606
Costs deferred	146
Amortization	(423)
Balance at end of period	$ 329

Balance Sheet Components - Comp

Balance Sheet Components - Components of Property and Equipment (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2019	Dec. 31, 2018
Property Plant And Equipment [Line Items]
Property and equipment, gross	$ 62,028	$ 60,217
Less: Accumulated depreciation and amortization	(52,265)	(48,402)
Property and equipment, net	9,763	11,815	[1]
Software, Including Internally Developed Software [Member]
Property Plant And Equipment [Line Items]
Property and equipment, gross	$ 27,710	25,518
Estimated useful life	3 years
Computer Equipment [Member]
Property Plant And Equipment [Line Items]
Property and equipment, gross	$ 22,619	22,714
Computer Equipment [Member] | Minimum [Member]
Property Plant And Equipment [Line Items]
Estimated useful life	3 years
Computer Equipment [Member] | Maximum [Member]
Property Plant And Equipment [Line Items]
Estimated useful life	4 years
Finance Lease ROU Assets [Member]
Property Plant And Equipment [Line Items]
Property and equipment, gross	$ 5,067	5,067
Leasehold Improvements [Member]
Property Plant And Equipment [Line Items]
Property and equipment, gross	4,645	4,778
Office Equipment, Furniture and Fixtures [Member]
Property Plant And Equipment [Line Items]
Property and equipment, gross	$ 1,987	$ 2,140
Office Equipment, Furniture and Fixtures [Member] | Minimum [Member]
Property Plant And Equipment [Line Items]
Estimated useful life	3 years
Office Equipment, Furniture and Fixtures [Member] | Maximum [Member]
Property Plant And Equipment [Line Items]
Estimated useful life	5 years
[1]	Derived from the Company’s audited consolidated financial statements as of December 31, 2018.

Balance Sheet Components - Addi

Balance Sheet Components - Additional Information (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018
Balance Sheet Components [Abstract]
Depreciation and amortization	$ 4,237	$ 5,056

Balance Sheet Components - Co_2

Balance Sheet Components - Components of Accrued Expenses and Other Current Liabilities (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Balance Sheet Components [Abstract]
Accrued salary and payroll-related expenses	$ 2,972	$ 3,695
Deferred strategic agreement revenues	2,721	934
Accrued liabilities	1,983	1,249
Income taxes payable	636	883
Finance lease liabilities	777	866
Advanced billings	437	859
Customer advances	282	432
Sales and use tax payable	4	244
Deferred rent	0	538
Other	909	932
Total accrued expenses and other current liabilities	$ 10,721	$ 10,632	[1]
[1]	Derived from the Company’s audited consolidated financial statements as of December 31, 2018.

Goodwill and Intangible Asset_2

Goodwill and Intangible Assets - Activity of Goodwill (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2019USD ($)
Goodwill [Roll Forward]
Balance at beginning of period	$ 1,943	[1]
Foreign currency translation adjustments	(75)
Balance at end of period	$ 1,868
[1]	Derived from the Company’s audited consolidated financial statements as of December 31, 2018.

Goodwill and Intangible Asset_3

Goodwill and Intangible Assets - Summary of Intangible Assets (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2019	Dec. 31, 2018
Finite Lived Intangible Assets [Line Items]
Intangible assets, gross	$ 9,910	$ 11,990
Less: accumulated amortization	(9,440)	(10,052)
Intangible assets, net	470	1,938	[1]
Developed Technology [Member]
Finite Lived Intangible Assets [Line Items]
Intangible assets, gross	$ 9,910	9,910
Developed Technology [Member] | Minimum [Member]
Finite Lived Intangible Assets [Line Items]
Estimated useful life	5 years
Developed Technology [Member] | Maximum [Member]
Finite Lived Intangible Assets [Line Items]
Estimated useful life	6 years
Customer Relationships [Member]
Finite Lived Intangible Assets [Line Items]
Intangible assets, gross	$ 0	$ 2,080
Estimated useful life	4 years
[1]	Derived from the Company’s audited consolidated financial statements as of December 31, 2018.

Goodwill and Intangible Asset_4

Goodwill and Intangible Assets - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Goodwill And Intangible Assets Disclosure [Abstract]
Amortization of intangible assets	$ 468	$ 598	$ 1,468	$ 1,939

Goodwill and Intangible Asset_5

Goodwill and Intangible Assets - Schedule of Future Estimated Amortization of Intangible Assets (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018	[1]
Future Estimated Amortization of Intangible Assets [Abstract]
Remaining three months of 2019	$ 375
Year ending December 31, 2020	95
Intangible assets, net	$ 470	$ 1,938
[1]	Derived from the Company’s audited consolidated financial statements as of December 31, 2018.

Restructuring Activities - Addi

Restructuring Activities - Additional Information (Details) - 2018 Restructuring Plan [Member] - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Restructuring Cost And Reserve [Line Items]
Percentage headcount reduction			13.00%
Restructuring related expenses	$ 0	$ 161	$ 229	$ 1,107

Shelf Registration Statement _2

Shelf Registration Statement and At-the-Market Offering - Additional Information (Details) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2019USD ($)shares	Sep. 30, 2019USD ($)$ / sharesshares
Registration Payment Arrangement [Line Items]
Issuance of common stock (in shares) | shares	0	570
Proceeds from sales		$ 1,504
Offering costs		$ 203
Weighted average sales price (in dollars per share) | $ / shares		$ 3
Maximum [Member]
Registration Payment Arrangement [Line Items]
Aggregate offering price	$ 50,000	$ 50,000
Compensation percentage		5.00%
Common stock aggregate offering price available for issuance	11,293	$ 11,293
JMP Securities [Member] | Maximum [Member]
Registration Payment Arrangement [Line Items]
Aggregate offering price	$ 13,000	$ 13,000

Equity Award Plans - Additional

Equity Award Plans - Additional Information (Details) - shares	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Feb. 28, 2013
2013 Plan [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of shares available for future grant	708,000		708,000		643,000
Percentage of increase in outstanding common shares			5.00%
Increase in shares available for issuance (in shares)			297,000
2013 Employee Stock Purchase Plan [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Increase in shares available for issuance (in shares)			59,000
Common stock shares reserved for issuance (in shares)	171,000		171,000		143,000
Percentage of lesser of fair market value of common stock			85.00%
Percentage of increase in outstanding shares			1.00%
Stock issued during period (in shares)	0	0	42,000	31,000
2013 Employee Stock Purchase Plan [Member] | Maximum [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Increase in shares available for issuance, authorized (in shares)	100,000		100,000

Equity Award Plans - Summary of

Equity Award Plans - Summary of Stock Options Activity (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended	12 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Dec. 31, 2018
Number of Shares
Options granted	0	0
2006 and 2013 Plan [Member] | Stock Options [Member]
Number of Shares
Balance at beginning of period			436,000
Options granted			128,000
Options forfeited and cancelled			(14,000)
Balance at end of period	550,000		550,000	436,000
Options exercisable	356,000		356,000
Options vested	356,000		356,000
Options vested and expected to vest	527,000		527,000
Weighted?Average Exercise?Price Per?Share
Balance at beginning of period			$ 29.01
Options granted			4
Options forfeited and cancelled			62.96
Balance at end of period	$ 22.33		22.33	$ 29.01
Options exercisable	31.09		31.09
Options vested	31.09		31.09
Options vested and expected to vest	$ 23.04		$ 23.04
Weighted Average Remaining Contractual Term?(in?Years)
Options outstanding			6 years 11 months 12 days	6 years 9 months 14 days
Options granted			9 years 7 months 13 days
Options exercisable			5 years 9 months 18 days
Options vested			5 years 9 months 18 days
Options vested and expected to vest			6 years 10 months 6 days
Aggregate Intrinsic?Value
Options outstanding			$ 0
Options outstanding	$ 0		$ 0	$ 0

Equity Award Plans - Summary _2

Equity Award Plans - Summary of RSUs Granted and Unvested (Details) - 2013 Plan [Member] - RSUs [Member] shares in Thousands	9 Months Ended
	Sep. 30, 2019$ / sharesshares
Number of Shares
Granted and unvested at beginning of period | shares	834
RSUs granted | shares	737
RSUs vested | shares	(92)
RSUs cancelled and withheld to cover taxes | shares	(366)
Granted and unvested at end of period | shares	1,113
Weighted Average?Grant Date Fair Value?Per?Unit
Granted and unvested at beginning of period | $ / shares	$ 7.99
RSUs granted | $ / shares	3.93
RSUs vested | $ / shares	9.43
RSUs cancelled and withheld to cover taxes | $ / shares	6.88
Granted and unvested at end of period | $ / shares	$ 5.54

Stock-Based Compensation - Addi

Stock-Based Compensation - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock-based compensation expense	$ 653	$ 875	$ 2,100	$ 2,933
Options granted	0	0
Expected life			6 months
Stock Options [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Options exercised (in shares)	0	0	0	0
Unrecognized compensation cost related to options	$ 478		$ 478
Share-based compensation, weighted average recognized period			1 year 9 months 18 days
RSUs [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Share-based compensation, weighted average recognized period			2 years 6 months
Unrecognized compensation cost related to RSUs	$ 4,231		$ 4,231

Stock-Based Compensation - Assu

Stock-Based Compensation - Assumptions for Black-Scholes Option-Pricing Model (Details) - Stock Options [Member]	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018
Assumptions for Black-Scholes Option Pricing Model [Abstract]
Dividend yield	0.00%	0.00%
Expected volatility	66.40%	55.90%
Risk-free interest rate	2.18%	2.54%
Expected life of options (in years)	4 years	4 years

Leases - Additional Information

Leases - Additional Information (Details)	3 Months Ended		9 Months Ended
	Sep. 30, 2019USD ($)ft²	Sep. 30, 2018USD ($)	Sep. 30, 2019USD ($)ft²Manufacturer	Sep. 30, 2018USD ($)	Dec. 31, 2018USD ($)	[1]
Lessee Lease Description [Line Items]
Weighted average discount rate, operating lease	6.80%		6.80%
Weighted average discount rate, finance lease	6.10%		6.10%
Weighted average remaining lease term, operating lease	2 years 4 months 24 days		2 years 4 months 24 days
Weighted average remaining lease term, finance lease	1 year		1 year
Operating lease, right-of-use asset	$ 8,641,000		$ 8,641,000		$ 0
Operating leases, rent expense	1,943,000	$ 2,089,000	$ 5,869,000	$ 6,284,000
Number of manufacturers entered into finance lease arrangements | Manufacturer			2
Finance lease, right-of-use asset	720,000		$ 720,000
Depreciation of finance lease assets	184,000	221,000	545,000	725,000
Finance lease, interest expense	$ 13,000	34,000	$ 55,000	116,000
Additional area subleased | ft²	14,380		14,380
Sublease income	$ 570,000	$ 366,000	$ 1,711,000	$ 920,000
Letter of Credit [Member]
Lessee Lease Description [Line Items]
Maximum borrowing capacity	$ 109,000		$ 109,000
[1]	Derived from the Company’s audited consolidated financial statements as of December 31, 2018.

Leases - Maturities of Lease Li

Leases - Maturities of Lease Liabilities (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Maturities of Operating Lease Liabilities [Abstract]
2019 (remaining three months)	$ 2,006
2020	3,657
2021	3,306
2022	1,844
Total lease payments	10,813
Less: Amount representing imputed interest	(823)
Present value of lease liabilities	9,990
Less: Current portion of lease liabilities	(4,294)	$ 0	[1]
Non-current portion of lease liabilities	5,696	0	[1]
Maturities of Finance Lease Liabilities [Abstract]
2019 (remaining three months)	278
2020	552
2021	12
2022	0
Total lease payments	842
Less: Amount representing imputed interest	(29)
Present value of lease liabilities	813
Less: Current portion of lease liabilities	(777)	$ (866)
Non-current portion of lease liabilities	$ 36
[1]	Derived from the Company’s audited consolidated financial statements as of December 31, 2018.

Leases - Supplemental Cash Flow

Leases - Supplemental Cash Flow Information Related to Leases (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018
Cash paid for amounts included in the measurement of lease liabilities:
Financing cash flows from finance leases	$ 986	$ 971
Operating cash flows from finance leases	61
Operating cash flows from operating leases	6,317
ROU assets obtained in exchange for lease liabilities:
Finance lease liabilities	0
Operating lease liabilities	$ 812

Leases - Future Minimum Amounts

Leases - Future Minimum Amounts Due Under Subleases (Details) $ in Thousands	Sep. 30, 2019USD ($)
Leases [Abstract]
2019 (remaining three months)	$ 569
2020	1,768
2021	1,105
2022	616
Total amounts due under subleases	$ 4,058

Income Taxes - Additional Infor

Income Taxes - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Income Tax Disclosure [Abstract]
Income tax expense (benefit)	$ (161)	$ 96	$ (70)	$ 624
Pre-tax loss	(3,434)	(21,398)	(11,952)	(38,258)
Uncertain tax positions, interest or penalties	$ 0	$ 0	$ 0	$ 0

Net Loss Per Share Available _3

Net Loss Per Share Available to Common Stockholders - Schedule of Calculation of Basic and Diluted Net Loss Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018
Numerator:
Net loss available to common stockholders	$ (3,273)	$ (21,494)	$ (11,882)	$ (38,882)	$ (41,244)
Denominator:
Weighted average number of shares, basic and diluted	6,631	5,787	6,262	5,763
Net loss per share available to common stockholders
Basic and diluted net loss per common share available to common stockholders	$ (0.49)	$ (3.71)	$ (1.90)	$ (6.75)

Net Loss Per Share Available _4

Net Loss Per Share Available to Common Stockholders - Schedule of Potential Common Shares Outstanding (Details) - shares shares in Thousands	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Shares excluded from computation of diluted net loss per share (in shares)	1,663	1,489
Options to Purchase Common Stock [Member]
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Shares excluded from computation of diluted net loss per share (in shares)	550	512
Unvested RSUs [Member]
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Shares excluded from computation of diluted net loss per share (in shares)	1,113	977