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 (Topic 842), or Accounting Standards Codification 842 (“ASC 842”), which superseded existing accounting guidance for leases. ASC 842 requires an entity to recognize an asset and lease liability for all leases with terms of more than 12 months. The Company adopted ASC 842 effective January 1, 2019 using the modified retrospective method. As a result, the Company has not changed previously disclosed amounts or provided additional disclosures for comparative periods. There was no impact to the Company’s opening balance of accumulated deficit. As part of this adoption, the Company elected the package of transitional practical expedients to not reassess (1) whether any contracts that existed prior to adoption have or contain leases, (2) the classification of existing leases or (3) initial direct costs for existing leases. The Company did not elect the practical expedient to use hindsight in determining its lease terms. 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 (Topic 220), which allows for a reclassification from accumulated other comprehensive income to retained earnings for stranded tax effects resulting from the Tax Cuts and Jobs Act. The Company adopted ASU 2018-02 on January 1, 2019, which had no effect on its condensed consolidated financial statements for the three and nine months ended September 30, 2019.
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 (Topic 326), which changes the impairment model for most financial assets and certain other instruments to require the use of a new forward-looking “expected loss” model that will generally result in earlier recognition of allowances for losses. This ASU will also require disclosure of more information related to these items. ASU 2016-13 is effective for annual periods beginning after December 15, 2019, and interim periods within those fiscal years, and early adoption is permitted. The Company is currently assessing the impact this ASU will have on its consolidated financial statements. In August 2018, the FASB issued ASU 2018-13, Fair Value Measurement (Topic 820), which is designed to improve the effectiveness of disclosures related to fair value measurements. ASU 2018-13 is effective for annual periods beginning after December 15, 2019, including interim periods within those fiscal years, and early adoption is permitted. The Company is currently assessing the impact this ASU will have on its consolidated financial statements. In August 2018, the FASB issued ASU 2018-15, Intangibles – Goodwill and Other – Internal-Use Software (Subtopic 35-40), which aligns the requirements for capitalizing implementation costs incurred in a hosting arrangement that is a service contract with the requirements for capitalizing implementation costs incurred to develop or obtain internal-use software. ASU 2018-15 is effective for annual periods beginning after December 15, 2019, including interim periods within those fiscal years, and early adoption is permitted. The Company is currently assessing the impact this ASU will have on its consolidated financial statements.

Summary of Business and Significant Accounting Policies (Policies)

9 Months Ended

Sep. 30, 2019

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 (Topic 842), or Accounting Standards Codification 842 (“ASC 842”), which superseded existing accounting guidance for leases. ASC 842 requires an entity to recognize an asset and lease liability for all leases with terms of more than 12 months. The Company adopted ASC 842 effective January 1, 2019 using the modified retrospective method. As a result, the Company has not changed previously disclosed amounts or provided additional disclosures for comparative periods. There was no impact to the Company’s opening balance of accumulated deficit. As part of this adoption, the Company elected the package of transitional practical expedients to not reassess (1) whether any contracts that existed prior to adoption have or contain leases, (2) the classification of existing leases or (3) initial direct costs for existing leases. The Company did not elect the practical expedient to use hindsight in determining its lease terms.

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 (Topic 220), which allows for a reclassification from accumulated other comprehensive income to retained earnings for stranded tax effects resulting from the Tax Cuts and Jobs Act. The Company adopted ASU 2018-02 on January 1, 2019, which had no effect on its condensed consolidated financial statements for the three and nine months ended September 30, 2019.

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 (Topic 326), which changes the impairment model for most financial assets and certain other instruments to require the use of a new forward-looking “expected loss” model that will generally result in earlier recognition of allowances for losses. This ASU will also require disclosure of more information related to these items. ASU 2016-13 is effective for annual periods beginning after December 15, 2019, and interim periods within those fiscal years, and early adoption is permitted. The Company is currently assessing the impact this ASU will have on its consolidated financial statements.

In August 2018, the FASB issued ASU 2018-13, Fair Value Measurement (Topic 820), which is designed to improve the effectiveness of disclosures related to fair value measurements. ASU 2018-13 is effective for annual periods beginning after December 15, 2019, including interim periods within those fiscal years, and early adoption is permitted. The Company is currently assessing the impact this ASU will have on its consolidated financial statements.

In August 2018, the FASB issued ASU 2018-15, Intangibles – Goodwill and Other – Internal-Use Software (Subtopic 35-40), which aligns the requirements for capitalizing implementation costs incurred in a hosting arrangement that is a service contract with the requirements for capitalizing implementation costs incurred to develop or obtain internal-use software. ASU 2018-15 is effective for annual periods beginning after December 15, 2019, including interim periods within those fiscal years, and early adoption is permitted. The Company is currently assessing the impact this ASU will have on its consolidated financial statements.