Marin Software (MRIN) 10-K/A 6 Mar 24 2023 FY Annual report (amended) Financial data

Document and Entity Information

Document and Entity Information - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Feb. 15, 2024	Jun. 30, 2023
Cover [Abstract]
Entity Registrant Name	Marin Software Incorporated
Entity Central Index Key	0001389002
Current Fiscal Year End Date	--12-31
Entity Current Reporting Status	Yes
Entity Well-known Seasoned Issuer	No
Entity Voluntary Filers	No
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 Annual Report	true
Document Transition Report	false
Entity Common Stock, Shares Outstanding		18,067,139
Entity Public Float			$ 9.1
Document Type	10-K/A
Amendment Flag	true
Document Period End Date	Dec. 31, 2023
Document Fiscal Year Focus	2023
Document Fiscal Period Focus	FY
Entity File Number	001-35838
Entity Tax Identification Number	20-4647180
Entity Incorporation, State or Country Code	DE
Entity Address, Address Line One	149 New Montgomery Street
Entity Address, Address Line Two	4th 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, par value $0.001 per share
Trading Symbol	MRIN
Amendment Description	Marin Software Incorporated (together with its subsidiaries, “Marin,” “our,” or the "Company") is filing this Amendment No. 1 on Form 10-K/A (this "Form 10-K/A") to amend our Annual Report on Form 10-K for the fiscal year ended December 31, 2023, initially filed with the Securities and Exchange Commission (the "SEC") on February 23, 2024 (the “Original Filing”). This Form 10-K/A amends Item 15 of Part IV of the Original Filing for an immaterial typographical error included in Note 1. Organization and Summary of Significant Accounting Policies.This Form 10-K/A consists solely of the cover page, this explanatory note, Part II. Item 8. “Financial Statements and Supplementary Data” in its entirety, Part IV. Item 15. “Exhibits and Financial Statement Schedules” in its entirety, the signature page, and the new certifications from the Company’s Principal Executive Officer and Principal Financial Officer.This Form 10-K/A speaks as of the date of the Original Filing and does not reflect events that may have occurred after the date of the Original Filing. This Form 10-K/A does not modify or update in any way the disclosures made in the Original Filing, except as described above, and should be read in conjunction with the Original Filing and with the Company’s subsequent filings with the SEC.
Document Financial Statement Error Correction [Flag]	true
Document Financial Statement Restatement Recovery Analysis [Flag]	false
Security Exchange Name	NASDAQ
ICFR Auditor Attestation Flag	false
Auditor Firm ID	248
Auditor Location	San Jose, California
Auditor Name	GRANT THORNTON LLP

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Current assets:
Cash and cash equivalents	$ 11,363	$ 27,957
Accounts receivable, net	3,864	4,521
Prepaid expenses and other current assets	1,548	2,016
Total current assets	16,775	34,494
Property and equipment, net	120	3,213
Right-of-use assets, operating leases	1,912	3,844
Other non-current assets	508	533
Total assets	19,315	42,084
Current liabilities:
Accounts payable	664	1,011
Accrued expenses and other current liabilities	2,099	3,513
Operating lease liabilities	1,518	1,645
Total current liabilities	4,281	6,169
Operating lease liabilities, non-current	394	2,199
Other long-term liabilities	1,001	1,002
Total liabilities	5,676	9,370
Commitments and contingencies (Note 15)
Stockholders' equity:
Common stock, $0.001 par value - 142,857 shares authorized, 17,226 and 15,532 shares issued and outstanding at December 31, 2022 and 2021, respectively	18	17
Additional paid-in capital	358,869	355,996
Accumulated deficit	(344,251)	(322,334)
Accumulated other comprehensive loss	(997)	(965)
Total stockholders' equity	13,639	32,714
Total liabilities and stockholders' equity	$ 19,315	$ 42,084

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parentheticals) - $ / shares shares in Thousands	Dec. 31, 2023	Dec. 31, 2022
Stockholders' equity:
Convertible preferred stock, par value (in dollars per share)	$ 0.001	$ 0.001
Convertible preferred stock, authorized (in shares)	10,000	10,000
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)	18,064	17,226
Common stock, outstanding (in shares)	18,064	17,226

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Loss - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Revenues, net	$ 17,731	$ 20,019
Cost of revenues	11,635	12,795
Gross profit	6,096	7,224
Operating expenses:
Sales and marketing	6,520	6,997
Research and development	10,235	11,832
General and administrative	8,871	10,396
Impairment loss on long-lived assets	3,276	0
Total operating expenses	28,902	29,225
Loss from operations	(22,806)	(22,001)
Other income, net	739	4,079
Loss before provision for (benefit from) income taxes	(22,067)	(17,922)
Income tax benefit, net	(150)	305
Net loss	(21,917)	(18,227)
Foreign currency translation adjustments	(32)	79
Comprehensive loss	$ (21,949)	$ (18,148)
Net loss per share available to common stockholders, basic	$ (1.24)	$ (1.15)
Net loss per share available to common stockholders, diluted	$ (1.24)	$ (1.15)
Weighted-average shares used to compute net loss per share available to common stockholders, basic	17,656,000	15,891,000
Weighted-average shares used to compute net loss per share available to common stockholders, diluted	17,656,000	15,891,000

Consolidated Statements of Stoc

Consolidated Statements of Stockholders' Equity - 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, 2021	$ 46,258	$ 15	$ 351,394	$ (304,107)	$ (1,044)
Balances at beginning of period (in shares) at Dec. 31, 2021		15,532
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net proceeds from common stock sold	1,333	$ 1	1,332
Common stock sold under agreement | shares		1,073
Issuance of common stock from vesting of restricted stock units (in shares)		594
Tax withholding related to vesting of restricted stock units	(434)		(434)
Issuance of common stock under employee stock purchase plan	37	$ 1	36
Issuance of common stock under employee stock purchase plan (in shares)		27
Stock-based compensation expense	3,668		3,668
Net loss	(18,227)			(18,227)
Foreign currency translation adjustments	79				79
Balances at end of period at Dec. 31, 2022	32,714	$ 17	355,996	(322,334)	(965)
Balances at end of period (in shares) at Dec. 31, 2022		17,226
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock from vesting of restricted stock units	1	$ 1
Issuance of common stock from vesting of restricted stock units (in shares)		825
Tax withholding related to vesting of restricted stock units	(238)		(238)
Issuance of common stock under employee stock purchase plan	6		6
Issuance of common stock under employee stock purchase plan (in shares)		13
Stock-based compensation expense	3,105		3,105
Net loss	(21,917)			(21,917)
Foreign currency translation adjustments	(32)				(32)
Balances at end of period at Dec. 31, 2023	$ 13,639	$ 18	$ 358,869	$ (344,251)	$ (997)
Balances at end of period (in shares) at Dec. 31, 2023		18,064

Consolidated Statements of St_2

Consolidated Statements of Stockholders' Equity (Parenthetical) - USD ($) $ in Thousands	1 Months Ended	12 Months Ended
	Feb. 28, 2021	Dec. 31, 2022	Dec. 31, 2020	Dec. 31, 2019
Statement of Stockholders' Equity [Abstract]
Offering costs	$ 157	$ 95	$ 463	$ 210

Consolidated Statements of Cash

Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Operating activities:
Net loss	$ (21,917)	$ (18,227)
Adjustments to reconcile net loss to net cash used in operating activities
Depreciation	19	447
Amortization of internally developed software	1,701	1,810
Amortization of right-of-use assets	1,528	2,832
Amortization of deferred costs to obtain and fulfill contracts	366	352
Forgiveness of Paycheck Protection Program loan	0	(3,117)
Impairment on long-lived assets	3,276
Loss on disposals of property and equipment and right-of-use assets	3	28
Unrealized foreign currency (gains) losses	46	80
Stock-based compensation related to equity awards	3,006	3,555
Provision for bad debts	(414)	16
Deferred income tax benefits	(70)	48
Changes in operating assets and liabilities
Accounts receivable	1,037	73
Prepaid expenses and other assets	183	(102)
Accounts payable	(353)	31
Accrued expenses and other liabilities	(1,466)	(2,786)
Operating lease liabilities	(1,528)	(3,177)
Net cash used in operating activities	(14,583)	(18,137)
Investing activities:
Purchases of property and equipment	0	(24)
Capitalization of internally developed software	(1,807)	(1,740)
Net cash used in investing activities	(1,807)	(1,764)
Financing activities:
Proceeds from issuance of common shares through at-the-market offering, net of offering costs	0	1,333
Repayment of Paycheck Protection Program loan	0	(203)
Employee taxes paid for withheld shares upon equity award settlement	(206)	(424)
Proceeds from employee stock purchase plan, net	(3)	34
Net cash provided by financing activities	(209)	740
Effect of foreign exchange rate changes on cash and cash equivalents and restricted cash	5	61
Net (decrease) increase in cash and cash equivalents and restricted cash	(16,594)	(19,100)
Cash and cash equivalents and restricted cash:
Beginning of year	27,957	47,057
End of year	11,363	27,957
Supplemental disclosures of other cash flow information:
Cash paid for (received from) income taxes	85	168
Forgiveness of Paycheck Protection Program loan		3,117
Supplemental disclosures of lease transactions:
Issuance of common stock under employee stock purchase plan	$ 6	$ 37

Background

Background	12 Months Ended
	Dec. 31, 2023
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Background	1. Organization and Summary of Significant Accounting Policies Organization Marin Software Incorporated ("Marin", "Marin Software", or 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 and eCommerce advertising, the Company’s platform helps digital marketers convert precise audiences, improve financial performance and make better decisions. References to “2023” and “2022” shall mean the years ended December 31, 2023 and 2022 , respectively. All amounts presented in these notes to the consolidated financial statements are in thousands, except where noted.

Summary of Significant Accounti

Summary of Significant Accounting Policies	12 Months Ended
	Dec. 31, 2023
Accounting Policies [Abstract]
Summary of Significant Accounting Policies	Principles of Consolidation The consolidated financial statements include the accounts of the Company and its wholly owned subsidiaries. All intercompany accounts and transactions have been eliminated upon consolidation. Reclassifications Certain prior fiscal year balances have been reclassified to conform to the current fiscal year presentation. Accounting Estimates The preparation of financial statements in conformity with accounting principles generally accepted in the United States (“GAAP”) requires management to make certain estimates and assumptions that affect the amounts reported in the financial statements and accompanying notes. The Company is subject to uncertainties such as the impact of future events, economic and political factors and changes in the Company’s business environment; therefore, actual results could differ from these estimates. Accordingly, the accounting estimates used in the preparation of the Company’s financial statements will change as new events occur, as more experience is acquired, as additional information is obtained and as the Company’s operating environment changes. Changes in estimates are made when circumstances warrant. Such changes in estimates and refinements in estimation methodologies are reflected in reported results of operations and if material, the effects of changes in estimates are disclosed in the notes to the consolidated financial statements. Significant estimates and assumptions by management affect the allowances for doubtful accounts and customer revenue credits, and the accounting for income taxes. Liquidity and Going Concern The Company has incurred significant losses in each fiscal year since its incorporation in 2006, and management expects such losses to continue in the future. The Company incurred net losses of $ 21,917 and $ 18,227 in 2023 and 2022, respectively. As of December 31, 2023, the Company had an accumulated deficit of $ 344,251 . The Company had cash and cash equivalents of $ 11,363 as of December 31, 2023. Historically, the Company has relied primarily on the sale of its capital stock to fund operating activities. Management expects to incur additional losses and experience negative operating cash flows into the foreseeable future. In July 2023, the Company commenced a restructuring plan that included a global reduction-in-force and other cost saving actions to reduce its expenses (the "2023 Restructuring Plan"). The 2023 Restructuring Plan resulted in the reduction of the Company's global employees by approximately 64 full-time employees during the second half of 2023, reducing its total headcount by approximately 37% from 172 as of June 30, 2023 to 108 as of December 31, 2023. As of December 31, 2023, the 2023 Restructuring Plan has been substantially completed. 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, which is impacted by several factors, such as its ability to manage its cash flows, including the effectiveness of cost saving measures that the Company has implemented in the second half of 2023, its ability to maintain its strategic partnerships, its ability to increase new bookings, the extent of customer acceptance, retention and use of its MarinOne platform, and general macroeconomic conditions such as inflation or the extent and duration of any recession. Although the Company has pursued, and may continue to pursue, additional sources of liquidity, including additional equity and debt financing, there is no assurance that any additional financing will be available on acceptable terms, or at all. Failure to manage its cash flows, improve customer retention rates, or raise additional capital would have a material adverse effect on the Company’s ability to achieve its intended business objectives. Based on the funds the Company has available as of the date of the filing of this Form 10-K/A and its history of recurring losses and negative operating cash flows, there is substantial doubt raised about the Company’s ability to continue as a going concern. The Company’s ability to continue as a going concern is substantially dependent upon its ability to achieve its intended business objectives. If the Company is unable to achieve its intended business objectives, it is probable that the Company may be required to initiate further cost savings activities, extend payment terms with suppliers, liquidate assets where possible, or wind-up operations. These actions could materially impact the Company’s business, results of operations and future prospects. Therefore, there is substantial doubt about the Company’s ability to continue as a going concern for one year after the filing date of the accompanying consolidated financial statements. The accompanying consolidated financial statements have been prepared assuming the Company will continue to operate as a going concern and do not include any adjustments to reflect the possible future effects on the recoverability and classification of assets or the amounts and classifications of liabilities that may result from the Company’s uncertainty related to its ability to continue as a going concern. These adjustments could materially impact the Company’s accompanying consolidated financial statements. In August 2021, the Company filed a new shelf registration statement on Form S-3 with the SEC, which was declared effective by the SEC on August 19, 2021 and provides that the Company may offer its common stock, preferred stock, debt securities, warrants, subscription rights and units having an aggregate offering price of up to $ 100,000 . As part of this new 2021 registration statement, the Company entered into a third equity distribution agreement with JMP Securities and established a new $ 50,000 “at-the-market” securities offering facility pursuant to which it may be able to issue and sell shares of its common stock. During the year ended December 31, 2022, the Company sold 1.1 million shares of its common stock under this new equity distribution agreement and received proceeds of approximately $ 1.3 million, net of offering costs of $ 0.1 million, at a weighted average sales price of $ 1.33 per share. In accordance with the SEC’s Instruction I.B.6 of Registration Statement on Form S-3, the Company adjusted the maximum aggregate market value of the securities that may be sold pursuant to this current "at-the-market" securities offering facility from $ 50,000 to approximately $ 22,800 based on the market capitalization of the Company on the date the Company filed its Annual Report on Form 10-K for the year ended December 31, 2021. The Company is not aware of any s pecific event or circumstance that would require it to update its estimates, judgments or revise the carrying value of its assets or liabilities. These estimates may change, as new events occur and additional information is obtained, and are recognized in the consolidated financial statements as soon as they become known. Actual results could differ from those estimates and any such differences may be material to the Company’s accompanying consolidated financial statements. 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 and eCommerce 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 advertisin g 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. Refer to Note 2 for further discussion on the Company's revenues. Cost of Revenues Cost of revenues primarily consists of costs related to hosting the Company’s cloud-based platform, providing implementation and ongoing customer support, data communications expenses, salaries and benefits of operations and support personnel, software license fees, costs associated with website development activities, indirect overhead, amortization expense associated with capitalized internally developed software and property and equipment depreciation. Stock-Based Compensation Expense Stock-based compensation expense is measured at grant date based on the fair value of the award and is expensed on a straight-line basis over the requisite service period. Restricted stock units (“RSUs”) are measured based on the fair market values of the underlying common stock on the dates of grant. Shares of common stock are issued on the vesting dates. Fair values of stock option awards are determined on the date of grant using the Black-Scholes option-pricing model. In applying this option-pricing model, the Company’s determination of the fair value of the stock option award on the date of grant is affected by the Company’s fair value of its common stock, as well as assumptions regarding a number of subjective variables. These variables include, but are not limited to, the Company’s expected stock price volatility, actual and projected stock option exercise behaviors and risk-free interest rate. For stock option and RSU awards with time-based vesting, the Company recognizes stock-based compensation expense over the requisite service period using the straight-line method, based on awards ultimately expected to vest. The Company recognizes forfeitures on stock options and RSU awards as they occur. Refer to Note 3 for further in formation. Impairment of Long-Lived Assets The Company evaluates long-lived assets for potential impairment whenever adverse events or changes in circumstances or business climate indicate that 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 the long-lived asset, or asset group, is not recoverable and exceeds its fair value. The carrying value of the 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 long-lived asset, or asset group. Refer to Note 7 for further in formation. Research and Development Research and development costs are expensed as incurred, except for certain internal software development costs, which may be capitalized as noted above. Research and development costs consist of personnel costs, including salaries, stock-based compensation expense, benefits and bonuses, as well as non-personnel costs such as professional fees payable to third-party development resources, amortization of intangible assets and allocated overhead costs. Advertising and Promotion Advertising and promotional costs are expensed as incurred and included in sales and marketing expense in the accompanying consolidated statements of comprehensive loss. Advertising and promotion expense totaled $ 909 and $ 653 for 2023 and 2022 , respectively, included in sales and marketing on the consolidated statements of comprehensive loss. Employee Benefit Plans The Company sponsors a 401(k) defined contribution plan (the "401(k) Plan") covering all employees in the United States and a statutorily required defined contribution pension plan (the "DCP Plan") covering all employees in the United Kingdom . The Company made contributions of $ 242 and $ 91 to the 401(K) Plan in 2023 and 2022 , respectively, and contributions of $ 65 and $ 69 to the DCP Plan in 2023 and 2022 , respectively. Sales Taxes Sales and other taxes collected from customers and remitted to governmental authorities are presented on a net basis and thus excluded from revenues. Foreign Currency For international subsidiaries whose functional currency is not the U.S. Dollar, the Company re-measures the monetary assets and liabilities of these subsidiaries to U.S. Dollars using rates of exchange in effect at the balance sheet date. Nonmonetary assets and liabilities are re-measured to U.S. Dollars using historical exchange rates, and other accounts are re-measured using average exchange rates in effect during each period presented. The effects of foreign currency translation adjustments are included in stockholders’ equity as a component of accumulated other comprehensive loss on the accompanying consolidated balance sheets, and related periodic movements are summarized as a line item in the consolidated statements of comprehensive loss. The Company records net gains and losses resulting from foreign exchange transactions as a component of other income, net. Aggregate foreign currency gains (losses) included in determining net loss were $( 137 ) a nd $( 127 ) in 2023 and 2022 , respectively. Income Taxes The Company accounts for income taxes using the asset and liability method. Under this method, deferred tax assets and liabilities are determined based on differences between the financial statement and tax basis of assets and liabilities and net operating loss and credit carryforwards using enacted tax rates in effect for the year in which the differences are expected to reverse. Valuation allowances are established when necessary to reduce deferred tax assets to the amounts expected to be realized. The Company accounts for uncertain tax positions using a more-likely-than-not threshold for financial statement recognition and measurement of tax positions taken or expected to be taken in a tax return. The Company establishes a liability for tax-related uncertainties based on estimates of whether, and the extent to which, additional taxes will be due. The Company records an income tax liability, if any, for the difference between the benefit recognized and measured and the tax position taken or expected to be taken on the Company’s tax returns. To the extent that the assessment of such tax positions changes, the change in estimate is recorded in the period in which the determination is made. The liability is adjusted in light of changing facts and circumstances, such as the outcome of a tax audit. The Compa ny recognizes interest and penalties related to uncertain tax positions as income tax expense, though such amounts were no t material in 2023 or 2022. The Company does not expect that changes in the liability for uncertain tax positions for the next twelve months will have a material impact on the Company’s consolidated financial position or results of operations. Segment Reporting The Company defines the term “chief operating decision maker” to be the Company's Chief Executive Officer. The Company's 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. Cash and Cash Equivalents The Company considers all highly liquid investments with an original or remaining maturity from the Company’s date of purchase of 90 days or less to be cash equivalents. Deposits held with financial institutions are likely to exceed the amount of insurance on these deposits. Cash equivalents consist of money market funds which are readily convertible into cash and have original maturity dates of less than three months from the date of their respective purchases. Cash equivalents were $ 10,548 and $ 26,645 as of December 31, 2023 and 2022, respectively. Allowance for Credit Losses The allowance for credit losses reflects the Company’s best estimate of probable losses inherent in the Company’s receivables portfolio determined by a forward-looking current expected credit loss model. The Company performs a regular review of its customers’ payment histories and associated credit risks and it generally does not require collateral from its customers. 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. The Company maintains an allowance for credit losses which reflects its best estimate of potentially uncollectible trade receivables and is based on both specific and general reserves. General reserves are maintained on a collective basis by considering factors such as historical experience, the age of the receivable balances, current economic conditions and a reasonable and supportable forecast of future economic conditions. The allowance for credit losses charges are included as a component of general and administrative expenses. The following are changes in the allowance for credit losses for the periods presented: Years Ended December 31, 2023 2022 Balances at beginning of year $ 736 $ 786 Addition to (reduction in) expense 29 16 Write-offs and other deductions ( 264 ) ( 66 ) Balances at end of year $ 501 $ 736 Revenue Credits From time to time, the Company provides revenue credits to customers. These typically relate to customer disputes and billing adjustments and are recorded as a reduction of revenues, net. Reserves for these revenue credits are accounted for as variable consideration under authoritative revenue recognition guidance and are estimated based on historical credit activity. As of December 31, 2023 and 2022, the Company recorded an allowance for potential customer revenue credits in the amount of $ 12 an d $ 110 , respectively. Fair Value of Financial Instruments The Company’s financial instruments, including accounts receivable, accounts payable and accrued expenses are carried at cost, which approximates fair value because of the short-term nature of those instruments. Based on borrowing rates available to the Company and the Company’s credit risk profile, the carrying value of outstanding lease liabilities approximates fair value as well. The Company measures and reports certain financial assets at fair value on a recurring basis, including its investments in money market funds. The fair value hierarchy prioritizes the inputs into three broad levels, which are: Level 1 - Inputs are unadjusted quoted prices in active markets for identical assets or liabilities Level 2 - Inputs are quoted prices for similar assets and liabilities in active markets or inputs that are observable for the asset or liability, either directly or indirectly through market corroboration, or substantially the full term of the financial instrument Level 3 - Inputs are unobservable inputs based on the Company's assumptions A financial instrument’s level within the fair value hierarchy is based on the lowest level of input that is significant to the fair value measurement. Account balances measured at fair value on a recurring basis include the following as of the dates presented: December 31, 2023 2022 Level 1 Level 2 Level 3 Level 1 Level 2 Level 3 Cash equivalents: Money market funds $ 10,548 $ — $ — $ 26,645 $ — $ — The Company’s cash equivalents balance as of December 31, 2023 and 2022 consisted of money market funds that are classified as Level 1 financial instruments as they have active markets. The fair value of the Company’s money market funds approximated amortized cost and, as such, there were no unrealized gains or losses on money market funds as of December 31, 2023 and 2022 . Concentration of Credit Risk Financial instruments that potentially subject the Company to concentrations of credit risk consist of cash, cash equivalents and accounts receivable. The Company’s cash and cash equivalents are placed with high-credit-quality financial institutions and issuers, and at times exceed federally insured limits. The Company has not experienced any loss relating to cash and cash equivalents in these accounts. The Company performs periodic credit evaluations of its customers and generally does not require collateral. As of December 31, 2023 and 2022, accounts receivable from one long-term strategic agreement with Google, as described in Note 2, accounted for 46 % and 40 %, respectively, of the Company's total accounts receivable, net. Revenues, net from the same long-term strategic agreement accounted for 40 % and 36 % of total revenues, net for the years ended December 31, 2023 and 2022 , respectively. Property and Equipment Property and equipment are stated at historical cost less accumulated depreciation and amortization. Depreciation and amortization are computed using the straight-line method over the estimated useful lives of the related assets. Upon retirement or sale, the cost and related accumulated depreciation are removed from the balance sheet and the resulting gain or loss is reflected in operations. Major additions and improvements are capitalized while repairs and maintenance that do not extend the life of the asset are charged to operations as incurred. Depreciation and amortization expense is allocated to both cost of revenues and operating expenses. Internally Developed Software Costs incurred in the development phase are capitalized and amortized over the product’s estimated useful life, which is three years . The Company expenses all costs incurred that relate to planning and post implementation phases of development. Development phase costs generally inc lude salaries and personnel costs and third-party contractor expenses associated with software development, configuration and coding. Capitalized costs related to internally developed software under development are treated as construction in progress until the program, feature or functionality is ready for its intended use, at which time amortization commences. For 2023 and 2022, the Company capitalized $ 1,906 and $ 1,853 of costs related to internally developed software, respectively. Amortization of capitalized costs related to internally developed software was $ 1,701 and $ 1,810 for 2023 and 2022, respectively. As of December 31, 2023 and 2022, unamortized internally developed software costs, including construction in progress, totaled $ 3,276 and $ 3,071 , respectively. Amortization of internally developed software is reflected in cost of revenues. Costs associated with minor enhancements and maintenance are expensed as incurred. Leases The Company has operating leases for space at a data center and for office space worldwide. New contractual arrangements are evaluated 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 right-of-use ("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 12 months or less, the Company recognizes the lease expense as incurred and does not recognize lease liabilities and ROU assets. 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. Current and non-current operating lease liabilities are presented on the 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 consolidated balance sheets. 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 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. Refer to Note 8 for further discussion on the Company’s leases. Borrowings The Company accounted for its Paycheck Protection Program ("PPP") Loan as debt under the guidance in Accounting Standards Codification 470, Debt. As such, the outstanding amount was reflected as a note payable in the Company’s consolidated balance sheets, the proceeds were reflected under financing activities in the Company’s consolidated statement of cash flows and interest expense was accrued and recognized in the Company’s statement of operations. An aggregate principal amount of $ 3,117 of the Loan was forgiven in January 2022 and the Company repaid the remaining outstanding balance of approximately $ 200 in February 2022. The forgiveness of a $ 3,117 of the PPP Loan amount in January 2022 was reflected as a gain on debt extinguishment in the Company’s statement of operations and as an adjustment to cash from operating activities in the Statements of Cash Flows. The $200 repayment was reflected as a financing activity in the Statements of Cash Flows. Refer to Note 9 for fu rther information. Recently Adopted Accounting Pronouncements On January 1, 2023, the Company adopted Accounting Standards Update ("ASU") 2016-13, Financial Instruments – Credit Losses – Measurement of Credit Losses on Financial Instruments (Topic 326) , using the modified retrospective transition method. Upon adoption, the Company changed its impairment model to utilize a forward-looking current expected credit losses model in place of the incurred loss methodology for financial instruments measured at amortized cost, primarily the Company’s accounts receivable. The cumulative effect from adoption was immaterial to the Company’s consolidated financial statements. Recent Accounting Pronouncements Not Yet Effective In November 2023, the Financial Standards Accounting Board ("FASB") issued ASU 2023-07, Segment Reporting – Improvements to Reportable Segment Disclosures (Topic 280) ("ASU 2023-07"). ASU 2023-07 expands annual and interim disclosure requirements for reportable segments, primarily through enhanced disclosures about significant segment expenses. ASU 2023-07 is effective for our annual periods beginning January 1, 2024, and for interim periods beginning January 1, 2025, with early adoption permitted. The Company is evaluating the impact of this guidance on its consolidated financial statements and related disclosures. In December 2023, the FASB issued ASU 2023-09, Income Taxes – Improvements to Income Tax Disclosures (Topic 740) ("ASU 2023-09"). ASU 2023-09 requires enhanced annual disclosures regarding the rate reconciliation and income taxes paid information. ASU 2023-09 is effective for annual periods beginning after December 15, 2024 and may be adopted on a prospective or retrospective basis. Early adoption is permitted. The Company is evaluating the impact of this guidance on its consolidated financial statements and related disclosures.

Revenues

Revenues	12 Months Ended
	Dec. 31, 2023
Revenue from Contract with Customer [Abstract]
Revenues	. Revenues Revenue Recognition 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 a performance obligation. Subscriptions 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, though certain contracts extend up to two years . 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. Generally 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 ASC 606. Expected future revenues for subscription services related to performance obligations that are unsatisfied (or partially unsatisfied) as of December 31, 2023 were as follows: Subscription Services Revenues 2024 $ 1,015 2025 268 Total $ 1,283 The Company applies the optional exemption under ASC 606 and does not disclose the value of unsatisfied performance obligations on subscription contracts with an original term of one year or less. The amounts disclosed above as remaining performance obligations consist primarily of fixed or monthly minimum fees under contracts with an original expected duration of greater than one year . The amounts exclude estimates of variable consideration such as volume-based contracts, as well as anticipated renewals of contracts. 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. The first Google agreement was executed in December 2018, with an effective date of October 1, 2018 and expired in September 2021 (the “Original Google Revenue Share Agreement”). Under the Original Google Revenue Share Agreement, which constituted a single performance obligation, the Company was eligible to receive 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 Original Google Revenue Share Agreement required the Company to reinvest a specified percentage of these revenue share payments in its search technology platform to drive innovation. The performance obligation was 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. In September 2021, the Company entered into a New Revenue Share Agreement with Google, which agreement has a scheduled three-year term beginning on October 1, 2021 (the "New Google Revenue Share Agreement") and continuing through September 30, 2024. This agreement is similar to the Original Google Revenue Share Agreement in that the Company is eligible to receive fixed and variable revenue share payments based on a percentage of the search advertising spend that is managed through the Company’s platform and in that the Company is required to reinvest a specified percentage of these revenue share payments in its search technology platform to drive innovation. The Company expects to recognize revenues totaling approximatel y $ 5,363 for th e year ending December 31, 2024, related to remaining performance obligations under this New Google Revenue Share Agreement. The Company evaluates the total amount of variable revenue share payments expected to be earned from the New Google Revenue Share Agreement by using the most likely 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 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 years ended December 31, 2023 and 2022, the Company recogni zed $ 7,150 as revenues from the New Google Revenue Share Agreement. Disaggregation of Revenues, net Revenues, net by geographic area, based on the billing location of the customer, were as follows for the periods presented: Years Ended December 31, 2023 2022 United States of America $ 14,213 $ 15,867 United Kingdom 2,038 2,272 Other (1) 1,480 1,880 Total revenues, net $ 17,731 $ 20,019 (1) No individual country within the “Other” category accounted for 10% or more of revenues, n et for any period presented. Revenues, net by nature of services performed were as follows for the periods presented: Years Ended December 31, 2023 2022 Subscriptions $ 10,585 $ 12,722 Strategic agreements 7,146 7,297 Total revenues, net $ 17,731 $ 20,019 Advertisers from outside of the United States represented 20 % and 21 % of total revenues for the years ended December 31, 2023 and 2022, respectively. The New Google Revenue Share Agreement accounted for approximately 40 % and 36 % for the years ended December 31, 2023 and 2022, respectively. Additionally, two customers accounted for approximately 24 % of total revenues for the year ended December 31, 2023. No additional customers represented greater than 10% of the Company's revenues for the years ended December 31, 2023 and 2022. 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. Included in the balance of accounts receivable, net as of December 31, 2022 was $ 1,788 , of unbilled receivables r elated to the New Google Revenue Share Agreement. Customer advances In certain situations, the Company receives cash payments from customers in advance of its performance of the underlying services. These advances from customers are included within accrued expenses and other current liabilities on the accompanying 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, th e 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 consolidated statements of comprehensive loss. There were no impairment losses related to costs capitalized in 2023 and 2022. 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 consolidated balance sheets. Changes in the balances of deferred costs to obtain and fulfill contracts during the year ended December 31, 2023 were as follows: Deferred Costs to Obtain Contracts Deferred Costs to Fulfill Contracts Balances at December 31, 2022 $ 344 $ 131 Costs deferred 207 70 Amortization ( 263 ) ( 103 ) Balances at December 31, 2023 $ 288 $ 98

Stock-Based Compensation

Stock-Based Compensation	12 Months Ended
	Dec. 31, 2023
Share-Based Payment Arrangement [Abstract]
Stock-Based Compensation	3. Stock-based Compensation Stock-based Compensation Expense Stock-based compensation expense was allocated as follows: Years Ended December 31, 2023 2022 (in thousands) Cost of revenues $ 307 $ 481 Sales and marketing 502 596 Research and development 825 996 General and administrative 1,372 1,482 $ 3,006 $ 3,555 For stock-based awards granted by the Company, stock-based compensation cost is measured as of the grant date based on the fair value of the award and is subsequently expensed over the requisite service period. Stock-based compensation capitalized as internally developed software was $ 99 and $ 113 fo r 2023 and 2022, respectively. Equity Award Plans The Company may grant, or has granted, stock options, restricted stock awards, stock appreciation rights, RSUs, performance awards and stock bonuses under the following equity incentive plans: 2006 Plan 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. 2013 Plan 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 were eligible for issuance under the 2013 Plan. The 2013 Plan authorized the award of incentive and non-statutory stock options, restricted stock awards, stock appreciation rights, 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 automatically increased 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 861 shares of common stock on January 1, 2023. The 2013 Plan has expired in accordance with its terms and the Company has ceased granting awards under this plan. Amended and Restated Plan On March 24, 2023, the Board approved the Amended and Restated 2013 Equity Incentive Plan ("Amended and Restated Plan") under which incentive and non-statutory stock options, restricted stock awards, stock appreciation rights, RSUs, performance awards and stock bonuses may be awarded to the Company’s employees, directors, consultants, independent contractors and advisors. Under the Amended and Restated Plan, 425 shares of common stock have been reserved for issuance. Additionally, shares that cease to be subject to equity awards that have been granted under the 2006 Plan and the 2013 Plan are eligible for issuance under the Amended and Restated Plan. On January 1 of each calendar year through 2033, the number of shares of common stock reserved under the Amended and Restated 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. The Company's stockholders approved the Amended and Restated Plan at the Company's 2023 annual stockholder meeting on May 25, 2023. Stock Options Under the 2006 Plan, the 2013 Plan and the Amended and Restated Plan, the term of options granted may not exceed ten years. Unless the terms of an optionee's stock option agreement provide otherwise, if an optionee's service relationship with the Company, or any of its affiliates, ceases for any reason other than disability or death, the optionee may exercise the vested portion of any options for three months after the date of such termination. If an optionee's service relationship with the Company, or any of its affiliates, ceases due to disability or death (or an optionee dies within a certain period following cessation of service), the optionee or a beneficiary may exercise any vested options for a period of 12 months. In no event, however, may an option be exercised beyond the expiration of its term. A summary of stock option activity under the 2006 Plan and the 2013 Plan is as follows: Options Outstanding Number of Shares Weighted Average Exercise Price Per Share Weighted Average Remaining Contract Term (in Years) Aggregate Intrinsic Value Balance at December 31, 2021 383 $ 23.23 4.85 $ — Options forfeited and cancelled ( 46 ) 49.87 — Balance at December 31, 2022 337 $ 19.59 4.45 $ — Options forfeited and cancelled ( 16 ) 76.91 — Balance at December 31, 2023 321 $ 16.78 3.63 $ — Options exercisable as of December 31, 2023 321 $ 16.78 3.63 Options vested as of December 31, 2023 321 16.78 3.63 Options vested and expected to vest as of December 31, 2023 321 16.78 3.63 There were no grants or exercises of stock options in 2023 or 2022. As of December 31, 2023, there wa s no unrecognized compensation cost related to options. The total estimated fair value of options vested was $ 31 during 2023 and 2022, respectively. RSUs A summary of RSU activity under the 2013 Plan and Amended and Restated Plan is as follows: RSUs Outstanding Number of Shares Weighted Average Grant Date Fair Value Per Unit Granted and unvested at December 31, 2021 1,542 $ 4.60 RSUs granted 1,142 1.90 RSUs vested ( 594 ) 3.72 RSUs cancelled and withheld to cover taxes ( 276 ) 5.91 Granted and unvested at December 31, 2022 1,814 $ 2.99 RSUs granted 1,482 1.23 RSUs vested ( 825 ) 2.97 RSUs cancelled and withheld to cover taxes ( 746 ) 2.99 Granted and unvested at December 31, 2023 1,725 $ 1.48 As of December 31, 2023, there was $ 1,431 of unrecognized compensation cost related to RSUs, which is expected to be recognized over a weighted-average period of 1.2 years. Th e 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 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 six-month purchase periods ending in May and November and 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 increased 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 100 shares on January 1, 2023. The 2013 ESPP has expired in accordance with its terms. On March 24, 2023, the Board approved the Amended and Restated 2013 Employee Stock Purchase Plan ("Amended and Restated ESPP") which provides for six-month purchase periods ending in May and November of each year with the purchase price for each share of common stock purchased being 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. Under the Amended and Restated ESPP, 432 shares of common stock have been reserved for issuance. The Company's stockholders approved the Amended and Restated ESPP at the Company's 2023 annual stockholder meeting on May 25, 2023. The Company estimates the fair value of purchase rights under the 2013 ESPP and Amended and Restated ESPP using the Black-Scholes valuation model. The fair value of each purchase right under the 2013 ESPP and Amended and Restated 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 and Amended and Restated ESPP.

Restructuring Activities

Restructuring Activities	12 Months Ended
	Dec. 31, 2023
Restructuring and Related Activities [Abstract]
Restructuring Activities	. Restructuring Activities 2023 Restructuring Plan In the third quarter of 2023 , the Company commenced the 2023 Restructuring Plan, which included a global reduction-in-force and other cost saving actions to reduce its operating costs, resulting in the reduction of the Company’s global employees by approximately 64 employees reducing its total headcount by approximately 37 % from 172 as of June 30, 2023 to 108 as of December 31, 2023. As of December 31, 2023, the Company had substantially completed the 2023 Restructuring Plan and had no restructuring liability outstanding related to the 2023 Restructuring Plan. During the year ended December 31, 2023, the Company recorded $ 1,821 of restructuring-related expenses in connection with the 2023 Restructuring Plan in the accompanying consolidated statements of comprehensive loss, of which $ 837 was included in research and development, $ 673 was included in cost of revenues, $ 189 was included in general and administrative and $ 122 was included in sales and marketing. 2020 Restructuring Plan In the third quarter of 2020, the Company commenced the implementation of a restructuring and reduction-in-force plan to reduce the Company’s operating costs and address the impact of the COVID-19 pandemic, which ultimately resulted in the reduction of the Company’s global workforce by approximately 60 employees, approximately half of which were located outside of the United States. The majority of the planned workforce reductions were substantially completed during 2020. For the year ended December 31, 2022, the Company recorded $ 266 of res tructuring-related expenses in connection with the 2020 Restructuring Plan in the accompanying consolidated statements of comprehensive loss, of which $ 171 was included in research and development, $ 78 was included in general and administrative and $ 17 was included in cost of revenues.

Balance Sheet Components

Balance Sheet Components	12 Months Ended
	Dec. 31, 2023
Balance Sheet Components [Abstract]
Balance Sheet Components	. Balance Sheet Components The following table shows the components of property and equipment as of the dates presented: December 31, Estimated Useful Life 2023 2022 Software, including internally developed software 3 years $ 34,972 $ 33,073 Computer equipment 3 to 4 years 18,080 18,622 Leasehold improvements Shorter of useful life or lease term 512 512 Office equipment, furniture and fixtures 3 to 5 years 94 630 Total property and equipment 53,658 52,837 Less: Accumulated depreciation and amortization ( 50,262 ) ( 49,624 ) Less: Accumulated impairment losses ( 3,276 ) — Property and equipment, net $ 120 $ 3,213 Depreciation and amortization of internally developed software for the year ended December 31, 2023 and 2022 was $ 1,720 an d $ 2,257 , respectively. During the fourth quarter of 2023, the Company concluded that indictors of impairment were present with respect to its sole asset group, which was determined by the Company to be the consolidated entity, due to the current economic environment and the Company’s history of recurring losses and negative operating cash flows. As a result, the Company compared the sum of undiscounted future cash flows of the asset group to its respective carrying amount and recorded an impairment loss on long-lived assets of $ 3,276 as t he difference between the carrying amount of the asset group and its estimated fair value for the year ended December 31, 2023 in the consolidated statements of comprehensive loss. The Company estimated the fair value of long-lived assets using a direct comparison market approach valuation method based on recent observable transactions of comparable transactions and assets. The following table shows the components of accrued expenses and other current liabilities as of the dates presented: December 31, 2023 2022 Accrued salary and payroll-related expenses $ 872 $ 1,460 Accrued liabilities 376 535 Income taxes payable 192 464 Advanced billings and customer credits (1) 636 1,016 Other 23 38 Total accrued expenses and other current liabilities $ 2,099 $ 3,513 (1) During the year ended December 31, 2023 the Company wrote off customer credit balances of $ 443 as credits to bad debt expense. No customer credit balances were written off during the year ended December 31, 2022.

Borrowing

Borrowing	12 Months Ended
	Dec. 31, 2023
Debt Disclosure [Abstract]
Borrowing	9. Borrowings In April 2020, the Company entered into an original loan agreement with Harvest Small Business Finance, LLC as the lender (“Lender”) for a loan in an aggregate principal amount of $ 3,320 (the “Loan”) pursuant to the PPP under the Coronavirus Aid, Relief, and Economic Security Act (the “CARES Act”) and implemented by the U.S. Small Business Administration (the “SBA”). The Loan was originally evidenced by a Note dated effective as of April 2020, but such Note was replaced by a Note with substantially the same terms, but with an updated effective date of May 2020 to account for a delay in disbursement of funds. The Loan matured two years from the date of first disbursement of the Loan, which occurred in May 2020. The Company received the loan proceeds on May 12, 2020. The Loan bore interest at a rate of 1 % per annum. Initially, all payments were deferred through the ten-month anniversary of the date of the Note. The Paycheck Protection Flexibility Act of 2020, P.L. 116-142, extended the deferral period for loan payment to the date that SBA remits the borrower’s loan forgiveness amount to the Lender. The PPP provided that borrowers may apply for forgiveness of amounts due under the Loan, with the amount of potential Loan forgiveness to be calculated based on payroll costs, any mortgage interest payments, any covered rent payments and any covered utilities payments during the 10-week period beginning on the date of first disbursement of the Loan. An aggregate principal amount of $ 3,117 of the Loan was forgiven in January 2022 and the Company repaid the remaining outstanding balance of approximately $ 200 in February 2022.

Shelf Registration and At-the-M

Shelf Registration and At-the-Market Offering	12 Months Ended
	Dec. 31, 2023
Shelf Registration And At The Market Offering [Abstract]
Shelf Registration and At-the-Market Offering	. Shelf Registration and At-the-Market Offering 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 could 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 was not required to sell any securities under this offering program. JMP Securities was 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. For the year ended December 31, 2020, the Company sold 2,726 shares of its common stock under this equity distribution agreement and received proceeds of $ 7,500 , net of offering costs of $ 463 , at a weighted average sales price of $ 2.92 per share. For the year ended December 31, 2019, the Company sold 658 shares of its common stock under this equity distribution agreement and received proceeds of $ 1,643 , net of offering costs of $ 210 , at a weighted average sales price of $ 2.82 per share. During February 2021, the Company sold an additional 1,186 shares of its common stock under the equity distribution agreement and received proceeds of $ 3,025 , net of offering costs of $ 157 , at a weighted average sales price of $ 2.68 per share. After such sales, no additional amounts were available to be sold under this equity distribution agreement. On July 15, 2021, the Company increased the size of the remaining $ 37,000 available on the Initial Registration Statement by an additional $ 3,000 allowing it to offer securities with an aggregate gross sales price of up to $ 40,000 . The Company also entered into a new equity distribution agreement with JMP Securities (the “July 2021 equity distribution agreement”) under which it could sell shares of its common stock up to a gross aggregate sales price of $ 40,000 through an at-the-market offering program administered by JMP Securities. JMP Securities was entitled to fees of 3 % of the gross proceeds from sales of the Company’s common stock under this July 2021 equity distribution agreement. In July 2021 the Company sold 4,316 shares of its common stock under the July 2021 equity distribution agreement and received proceeds of $ 38,800 , net of $ 1,200 in fees to JMP Securities, at a weighted average sales price of $ 9.27 per share, which resulted in the Company exhausting the amounts available for sale under the 2021 equity distribution agreement. On August 3, 2021, the Company filed a new shelf registration statement on Form S-3 with the SEC (the “2021 Registration Statement”), which was declared effective by the SEC on August 19, 2021 and provides that the Company may offer its common stock, preferred stock, debt securities, warrants, subscription rights and units having an aggregate offering price of up to $ 100,000 . As part of this 2021 Registration Statement, the Company entered into a third equity distribution agreement with JMP Securities and established a new $ 50,000 “at-the-market” securities offering facility, pursuant to which, the Company may be able to issue and sell shares of the Company common stock. During the year ended December 31, 2022, the Company sold 1.1 million shares of its common stock under this new equity distribution agre ement and received proceeds of approximately $ 1.3 million, net of offering costs of $ 0.1 million at a weighted average sales price of $ 1.33 per share. In accordance with the SEC’s Instruction I.B.6 of Registration Statement on Form S-3, the Company is adjusting the maximum aggregate market value of the securities that may be sold pursuant to this current "at-the-market" securities offering facility from $ 50,000 to approximately $ 22,800 based on the market capitalization of the Company on the date the Company filed its Annual Report on Form 10-K for the year ended December 31, 2021.

Leases

Leases	12 Months Ended
	Dec. 31, 2023
Leases [Abstract]
Leases	. Leases Operating and Finance Leases The Company's primary operating lease is for space at a data center which was renewed in April 2022 and expires in 2025. In April 2023, the Company finalized exercising an option to decrease the space at the data center under the operating lease. As a result, the Company remeasured its lease liability and adjusted its ROU assets by $ 565 , respectively, during 2023. 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. 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 December 31, 2023 , the weighted-average rate used in discounting the lease liabilities for ROU operating leases was 6.0 %. Curre nt and non-current operating lease liabilities are presented on the condensed consolidated balance sheet. Operating lease costs, consisting primarily of rental expense, were approximately $ 1,842 a nd $ 3,654 for the years ended December 31, 2023 and 2022, respectively. Variable rent expense was not material for the years ended December 31, 2023 or 2022. The maturities of operating lease liabilities as of December 31, 2023 are as follows: Operating Leases 2024 $ 1,584 2025 396 Total lease payments 1,980 Less: Amount representing imputed interest ( 68 ) Present value of lease liabilities 1,912 Less: Current portion of lease liabilities ( 1,518 ) Non-current portion of lease liabilities $ 394 Supplemental cash flow information related to operating leases was as follows: Years Ended December 31, 2023 2022 Cash paid for amounts included in the measurement of lease liabilities: Operating cash flows from operating leases $ 1,842 $ 3,974 ROU assets obtained in exchange for lease liabilities: $ 161 $ 5,015 Subleases The Company sublet portions of its San Francisco office space under an agreement that expired in July 2022. Income from this sublease agreement was included in other income, net, on the accompanying consolidated statements of comprehensive loss. Sublease income for the year ended December 31, 2022 was $ 587 .

Income Taxes

Income Taxes	12 Months Ended
	Dec. 31, 2023
Income Tax Disclosure [Abstract]
Income Taxes	. Income Taxes The components of the Company’s loss before provision for (benefit from) income taxes are as follows: Years Ended December 31, 2023 2022 United States of America $ ( 21,851 ) $ ( 18,455 ) International ( 216 ) 533 Loss before provision for (benefit from) income taxes $ ( 22,067 ) $ ( 17,922 ) The components of the provision for (benefit from) income taxes were as follows: Years Ended December 31, 2023 2022 Current income tax provision: State $ 10 $ 25 Foreign ( 90 ) 232 Total current income tax provision ( 80 ) 257 Deferred income tax benefit: Foreign ( 70 ) 48 Total deferred income tax benefit ( 70 ) 48 Provision for (benefit from) income taxes $ ( 150 ) $ 305 The differences in the total provision for (benefit from) income taxes that would result from applying the 21 % federal statutory rate in 2023 and 2022 to the loss before provision for income taxes and the reported provision for income taxes were as follows: Years Ended December 31, 2023 2022 Tax benefit at U.S. statutory rate $ ( 4,634 ) $ ( 3,763 ) Change in valuation allowance 2,131 6,009 Stock-based compensation 461 ( 6 ) Uncertain tax positions ( 31 ) ( 32 ) State income taxes, net of federal benefit ( 637 ) ( 1,288 ) Foreign income and withholding taxes 147 8 Other permanent differences 154 81 Expired other credits 2,269 — PPP loan forgiveness — ( 667 ) Provision to return adjustments ( 10 ) ( 37 ) Provision for (benefit from) income taxes $ ( 150 ) $ 305 Major components of the Company’s deferred tax assets and liabilities as of December 31, 2023 and 2022 were as follows: December 31, 2023 2022 Non-current deferred tax assets: Net operating loss $ 41,327 $ 37,783 Research and development credits 9,820 9,820 Other credits 1,292 4,165 Operating lease liabilities 516 1,037 Stock-based compensation 983 1,164 Property and equipment and intangible assets 956 — Capitalized research and development 1,709 912 Accruals and reserves 68 133 Gross non-current deferred tax assets 56,671 55,014 Right-of-use assets, operating leases ( 516 ) ( 1,037 ) Property and equipment and intangible assets - ( 23 ) Total non-current deferred tax liabilities ( 516 ) ( 1,060 ) Total deferred tax assets 56,155 53,954 Valuation allowance ( 56,055 ) ( 53,924 ) Net deferred tax assets (liabilities) $ 100 $ 30 The Tax Reform Act of 1986, as amended, imposes restrictions on the utilization of net operating losses and tax credit carryforwards in certain situations where changes occur in the stock ownership of a corporation. Utilization of a domestic net operation loss or tax credit carryforward may be subject to a substantial limitation due to ownership changes that may have occurred or that could occur in the future, as required by Internal Revenue Code Section 382 ("IRC Section 382"), as well as similar state provisions. Accordingly, a company’s ability to use net operating losses may be limited as prescribed under IRC Section 382. Events which may cause limitations in the amount of the net operating losses that the Company may use in any one year include, but are not limited to, a cumulative ownership change of more than 50 % over a three-year period. The Company last assessed the application of IRC Section 382 during the fourth quarter of 2017 and concluded that no such limitation currently applies. These conclusions are monitored in future periods as circumstances dictate, such as significant changes in the Company's stock ownership. In the event the Company experiences any subsequent changes in ownership, the amount of net operating losses and research and development credit carryovers available in any taxable year could be limited and may expire unutilized. As of December 31, 2023, the Company had federal and state net operating loss carryforwards of approximately $ 163,439 and $ 144,131 , respectively. The federal net operating loss carryforward will begin expiring in 2027 and the state net operating loss carryforward will begin expiring in 2025 . As of December 31, 2023, the Company had federal and state research and development credits of approximately $ 6,123 and $ 6,451 , respectively. The federal research and development credits will begin expiring in 2026 . The state research and development credits are not currently subject to expiration. As of December 31, 2023, the Company had approximately $ 1,123 of state enterprise zone credits which begin to expire in 2024 ; approximately $ 2,872 expired unutilized in 2023 . The Company has recorded a full valuation allowance against its otherwise recognizable deferred income tax assets as of December 31, 2022 and 2021 (except for the deferred income tax assets associated with certain of the Company’s foreign subsidiaries). The Company has determined, after evaluating all positive and negative historical and prospective evidence, that it is more likely than not that the deferred income tax assets will not be realized (except for those associated with certain of the Company's foreign subsidiaries). The valuation allowance increased by $ 2,131 and $ 6,009 for the years ended December 31, 2023, and December 31, 2022, respectively. The Company files federal, state and foreign income tax returns in jurisdictions with varying statutes of limitations. In the normal course of business, the Company is subject to examination by taxing authorities throughout the world. These audits include questioning the timing and amount of deduction, the nexus of income among various tax jurisdictions and compliance with state, local and foreign tax laws. The Company is not currently under any examination by any federal, state or foreign tax authorities. Because of net operating loss and credit carryforwards, all of the Company’s tax years dating to inception in 2006 remain open to examination. Uncertain Tax Positions As of December 31, 2023 and 2022, the Company had uncertain tax positions of $ 984 and $ 985 , respectively, that if recognized would impact the annual effective tax rate. During 2023 and 2022, the Company did not have any material interest or penalties related to uncertain tax positions. The aggregate changes in the balance of gross uncertain tax positions were as follows: Ending balance as of December 31, 2021 $ 9,055 Decrease in balances related to lapses in statutes of limitations ( 94 ) Ending balance as of December 31, 2022 8,961 Increase in balances related to tax positions taken during the prior period 30 Decrease in balances related to lapses in statutes of limitations ( 31 ) Ending balance as of December 31, 2023 $ 8,960 It is reasonably possible that uncertain tax positions existing as of December 31, 2023 could decrease by approximately $ 368 within the next twelve months.

Net Loss Per Share Available to

Net Loss Per Share Available to Common Stockholders	12 Months Ended
	Dec. 31, 2023
Earnings Per Share [Abstract]
Net Loss Per Share Available to Common Stockholders	5. Net Loss Per Share Available to Common Stockholders 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 was the same for all periods presented, as the impact of all potentially dilutive securities outstanding was anti-dilutive. The following table presents the calculation of basic and diluted net loss per share: Years Ended December 31, 2023 2022 Net loss available to common stockholders $ ( 21,917 ) $ ( 18,227 ) Weighted average number of shares, basic and diluted 17,656 15,891 Basic and diluted net loss per common share available to common stockholders $ ( 1.24 ) $ ( 1.15 ) 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: Years Ended December 31, 2023 2022 Options to purchase common stock 321 337 Unvested RSUs 1,725 1,814 Total 2,046 2,151

Commitments and Contingencies

Commitments and Contingencies	12 Months Ended
	Dec. 31, 2023
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	11. 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 December 31, 2023, no material amounts are recorded related to legal proceedings on the 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 for these obligations on the consolidated balance sheets as of December 31, 2023 and 2022. 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 for these obligations on the consolidated balance sheets as of December 31, 2023 and 2022. 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 Significant Accoun_2

Summary of Significant Accounting Policies (Policies)	12 Months Ended
	Dec. 31, 2023
Accounting Policies [Abstract]
Principles of Consolidation	Principles of Consolidation The consolidated financial statements include the accounts of the Company and its wholly owned subsidiaries. All intercompany accounts and transactions have been eliminated upon consolidation. Reclassifications Certain prior fiscal year balances have been reclassified to conform to the current fiscal year presentation.
Accounting Estimates	Accounting Estimates The preparation of financial statements in conformity with accounting principles generally accepted in the United States (“GAAP”) requires management to make certain estimates and assumptions that affect the amounts reported in the financial statements and accompanying notes. The Company is subject to uncertainties such as the impact of future events, economic and political factors and changes in the Company’s business environment; therefore, actual results could differ from these estimates. Accordingly, the accounting estimates used in the preparation of the Company’s financial statements will change as new events occur, as more experience is acquired, as additional information is obtained and as the Company’s operating environment changes. Changes in estimates are made when circumstances warrant. Such changes in estimates and refinements in estimation methodologies are reflected in reported results of operations and if material, the effects of changes in estimates are disclosed in the notes to the consolidated financial statements. Significant estimates and assumptions by management affect the allowances for doubtful accounts and customer revenue credits, and the accounting for income taxes.
Certain Significant Risks and Uncertainties	The Company has incurred significant losses in each fiscal year since its incorporation in 2006, and management expects such losses to continue in the future. The Company incurred net losses of $ 21,917 and $ 18,227 in 2023 and 2022, respectively. As of December 31, 2023, the Company had an accumulated deficit of $ 344,251 . The Company had cash and cash equivalents of $ 11,363 as of December 31, 2023. Historically, the Company has relied primarily on the sale of its capital stock to fund operating activities. Management expects to incur additional losses and experience negative operating cash flows into the foreseeable future. In July 2023, the Company commenced a restructuring plan that included a global reduction-in-force and other cost saving actions to reduce its expenses (the "2023 Restructuring Plan"). The 2023 Restructuring Plan resulted in the reduction of the Company's global employees by approximately 64 full-time employees during the second half of 2023, reducing its total headcount by approximately 37% from 172 as of June 30, 2023 to 108 as of December 31, 2023. As of December 31, 2023, the 2023 Restructuring Plan has been substantially completed. 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, which is impacted by several factors, such as its ability to manage its cash flows, including the effectiveness of cost saving measures that the Company has implemented in the second half of 2023, its ability to maintain its strategic partnerships, its ability to increase new bookings, the extent of customer acceptance, retention and use of its MarinOne platform, and general macroeconomic conditions such as inflation or the extent and duration of any recession. Although the Company has pursued, and may continue to pursue, additional sources of liquidity, including additional equity and debt financing, there is no assurance that any additional financing will be available on acceptable terms, or at all. Failure to manage its cash flows, improve customer retention rates, or raise additional capital would have a material adverse effect on the Company’s ability to achieve its intended business objectives. Based on the funds the Company has available as of the date of the filing of this Form 10-K/A and its history of recurring losses and negative operating cash flows, there is substantial doubt raised about the Company’s ability to continue as a going concern. The Company’s ability to continue as a going concern is substantially dependent upon its ability to achieve its intended business objectives. If the Company is unable to achieve its intended business objectives, it is probable that the Company may be required to initiate further cost savings activities, extend payment terms with suppliers, liquidate assets where possible, or wind-up operations. These actions could materially impact the Company’s business, results of operations and future prospects. Therefore, there is substantial doubt about the Company’s ability to continue as a going concern for one year after the filing date of the accompanying consolidated financial statements. The accompanying consolidated financial statements have been prepared assuming the Company will continue to operate as a going concern and do not include any adjustments to reflect the possible future effects on the recoverability and classification of assets or the amounts and classifications of liabilities that may result from the Company’s uncertainty related to its ability to continue as a going concern. These adjustments could materially impact the Company’s accompanying consolidated financial statements. In August 2021, the Company filed a new shelf registration statement on Form S-3 with the SEC, which was declared effective by the SEC on August 19, 2021 and provides that the Company may offer its common stock, preferred stock, debt securities, warrants, subscription rights and units having an aggregate offering price of up to $ 100,000 . As part of this new 2021 registration statement, the Company entered into a third equity distribution agreement with JMP Securities and established a new $ 50,000 “at-the-market” securities offering facility pursuant to which it may be able to issue and sell shares of its common stock. During the year ended December 31, 2022, the Company sold 1.1 million shares of its common stock under this new equity distribution agreement and received proceeds of approximately $ 1.3 million, net of offering costs of $ 0.1 million, at a weighted average sales price of $ 1.33 per share. In accordance with the SEC’s Instruction I.B.6 of Registration Statement on Form S-3, the Company adjusted the maximum aggregate market value of the securities that may be sold pursuant to this current "at-the-market" securities offering facility from $ 50,000 to approximately $ 22,800 based on the market capitalization of the Company on the date the Company filed its Annual Report on Form 10-K for the year ended December 31, 2021. The Company is not aware of any s pecific event or circumstance that would require it to update its estimates, judgments or revise the carrying value of its assets or liabilities. These estimates may change, as new events occur and additional information is obtained, and are recognized in the consolidated financial statements as soon as they become known. Actual results could differ from those estimates and any such differences may be material to the Company’s accompanying consolidated financial statements.
Concentration of Credit Risk	Concentration of Credit Risk Financial instruments that potentially subject the Company to concentrations of credit risk consist of cash, cash equivalents and accounts receivable. The Company’s cash and cash equivalents are placed with high-credit-quality financial institutions and issuers, and at times exceed federally insured limits. The Company has not experienced any loss relating to cash and cash equivalents in these accounts. The Company performs periodic credit evaluations of its customers and generally does not require collateral. As of December 31, 2023 and 2022, accounts receivable from one long-term strategic agreement with Google, as described in Note 2, accounted for 46 % and 40 %, respectively, of the Company's total accounts receivable, net. Revenues, net from the same long-term strategic agreement accounted for 40 % and 36 % of total revenues, net for the years ended December 31, 2023 and 2022 , respectively.
Cash and Cash Equivalents and Restricted Cash	Cash and Cash Equivalents The Company considers all highly liquid investments with an original or remaining maturity from the Company’s date of purchase of 90 days or less to be cash equivalents. Deposits held with financial institutions are likely to exceed the amount of insurance on these deposits. Cash equivalents consist of money market funds which are readily convertible into cash and have original maturity dates of less than three months from the date of their respective purchases. Cash equivalents were $ 10,548 and $ 26,645 as of December 31, 2023 and 2022, respectively. Allowance for Credit Losses The allowance for credit losses reflects the Company’s best estimate of probable losses inherent in the Company’s receivables portfolio determined by a forward-looking current expected credit loss model. The Company performs a regular review of its customers’ payment histories and associated credit risks and it generally does not require collateral from its customers. 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. The Company maintains an allowance for credit losses which reflects its best estimate of potentially uncollectible trade receivables and is based on both specific and general reserves. General reserves are maintained on a collective basis by considering factors such as historical experience, the age of the receivable balances, current economic conditions and a reasonable and supportable forecast of future economic conditions. The allowance for credit losses charges are included as a component of general and administrative expenses. The following are changes in the allowance for credit losses for the periods presented: Years Ended December 31, 2023 2022 Balances at beginning of year $ 736 $ 786 Addition to (reduction in) expense 29 16 Write-offs and other deductions ( 264 ) ( 66 ) Balances at end of year $ 501 $ 736 Revenue Credits From time to time, the Company provides revenue credits to customers. These typically relate to customer disputes and billing adjustments and are recorded as a reduction of revenues, net. Reserves for these revenue credits are accounted for as variable consideration under authoritative revenue recognition guidance and are estimated based on historical credit activity. As of December 31, 2023 and 2022, the Company recorded an allowance for potential customer revenue credits in the amount of $ 12 an d $ 110 , respectively.
Fair Value of Financial Instruments	Fair Value of Financial Instruments The Company’s financial instruments, including accounts receivable, accounts payable and accrued expenses are carried at cost, which approximates fair value because of the short-term nature of those instruments. Based on borrowing rates available to the Company and the Company’s credit risk profile, the carrying value of outstanding lease liabilities approximates fair value as well. The Company measures and reports certain financial assets at fair value on a recurring basis, including its investments in money market funds. The fair value hierarchy prioritizes the inputs into three broad levels, which are: Level 1 - Inputs are unadjusted quoted prices in active markets for identical assets or liabilities Level 2 - Inputs are quoted prices for similar assets and liabilities in active markets or inputs that are observable for the asset or liability, either directly or indirectly through market corroboration, or substantially the full term of the financial instrument Level 3 - Inputs are unobservable inputs based on the Company's assumptions A financial instrument’s level within the fair value hierarchy is based on the lowest level of input that is significant to the fair value measurement. Account balances measured at fair value on a recurring basis include the following as of the dates presented: December 31, 2023 2022 Level 1 Level 2 Level 3 Level 1 Level 2 Level 3 Cash equivalents: Money market funds $ 10,548 $ — $ — $ 26,645 $ — $ — The Company’s cash equivalents balance as of December 31, 2023 and 2022 consisted of money market funds that are classified as Level 1 financial instruments as they have active markets. The fair value of the Company’s money market funds approximated amortized cost and, as such, there were no unrealized gains or losses on money market funds as of December 31, 2023 and 2022 .
Property and Equipment	Property and Equipment Property and equipment are stated at historical cost less accumulated depreciation and amortization. Depreciation and amortization are computed using the straight-line method over the estimated useful lives of the related assets. Upon retirement or sale, the cost and related accumulated depreciation are removed from the balance sheet and the resulting gain or loss is reflected in operations. Major additions and improvements are capitalized while repairs and maintenance that do not extend the life of the asset are charged to operations as incurred. Depreciation and amortization expense is allocated to both cost of revenues and operating expenses.
Internally Developed Software	Internally Developed Software Costs incurred in the development phase are capitalized and amortized over the product’s estimated useful life, which is three years . The Company expenses all costs incurred that relate to planning and post implementation phases of development. Development phase costs generally inc lude salaries and personnel costs and third-party contractor expenses associated with software development, configuration and coding. Capitalized costs related to internally developed software under development are treated as construction in progress until the program, feature or functionality is ready for its intended use, at which time amortization commences. For 2023 and 2022, the Company capitalized $ 1,906 and $ 1,853 of costs related to internally developed software, respectively. Amortization of capitalized costs related to internally developed software was $ 1,701 and $ 1,810 for 2023 and 2022, respectively. As of December 31, 2023 and 2022, unamortized internally developed software costs, including construction in progress, totaled $ 3,276 and $ 3,071 , respectively. Amortization of internally developed software is reflected in cost of revenues. Costs associated with minor enhancements and maintenance are expensed as incurred.
Impairment of Long-Lived Assets	Impairment of Long-Lived Assets The Company evaluates long-lived assets for potential impairment whenever adverse events or changes in circumstances or business climate indicate that 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 the long-lived asset, or asset group, is not recoverable and exceeds its fair value. The carrying value of the 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 long-lived asset, or asset group. Refer to Note 7 for further in formation.
Leases	Leases The Company has operating leases for space at a data center and for office space worldwide. New contractual arrangements are evaluated 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 right-of-use ("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 12 months or less, the Company recognizes the lease expense as incurred and does not recognize lease liabilities and ROU assets. 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. Current and non-current operating lease liabilities are presented on the 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 consolidated balance sheets. 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 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. Refer to Note 8 for further discussion on the Company’s leases.
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 and eCommerce 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 advertisin g 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. Refer to Note 2 for further discussion on the Company's revenues.
Cost of Revenues	Cost of Revenues Cost of revenues primarily consists of costs related to hosting the Company’s cloud-based platform, providing implementation and ongoing customer support, data communications expenses, salaries and benefits of operations and support personnel, software license fees, costs associated with website development activities, indirect overhead, amortization expense associated with capitalized internally developed software and property and equipment depreciation.
Stock-Based Compensation Expense	Stock-Based Compensation Expense Stock-based compensation expense is measured at grant date based on the fair value of the award and is expensed on a straight-line basis over the requisite service period. Restricted stock units (“RSUs”) are measured based on the fair market values of the underlying common stock on the dates of grant. Shares of common stock are issued on the vesting dates. Fair values of stock option awards are determined on the date of grant using the Black-Scholes option-pricing model. In applying this option-pricing model, the Company’s determination of the fair value of the stock option award on the date of grant is affected by the Company’s fair value of its common stock, as well as assumptions regarding a number of subjective variables. These variables include, but are not limited to, the Company’s expected stock price volatility, actual and projected stock option exercise behaviors and risk-free interest rate. For stock option and RSU awards with time-based vesting, the Company recognizes stock-based compensation expense over the requisite service period using the straight-line method, based on awards ultimately expected to vest. The Company recognizes forfeitures on stock options and RSU awards as they occur. Refer to Note 3 for further in formation.
Research and Development	Research and Development Research and development costs are expensed as incurred, except for certain internal software development costs, which may be capitalized as noted above. Research and development costs consist of personnel costs, including salaries, stock-based compensation expense, benefits and bonuses, as well as non-personnel costs such as professional fees payable to third-party development resources, amortization of intangible assets and allocated overhead costs.
Advertising and Promotion	Advertising and Promotion Advertising and promotional costs are expensed as incurred and included in sales and marketing expense in the accompanying consolidated statements of comprehensive loss. Advertising and promotion expense totaled $ 909 and $ 653 for 2023 and 2022 , respectively, included in sales and marketing on the consolidated statements of comprehensive loss.
Employee Benefit Plans	Employee Benefit Plans The Company sponsors a 401(k) defined contribution plan (the "401(k) Plan") covering all employees in the United States and a statutorily required defined contribution pension plan (the "DCP Plan") covering all employees in the United Kingdom . The Company made contributions of $ 242 and $ 91 to the 401(K) Plan in 2023 and 2022 , respectively, and contributions of $ 65 and $ 69 to the DCP Plan in 2023 and 2022 , respectively.
Sales Taxes	Sales Taxes Sales and other taxes collected from customers and remitted to governmental authorities are presented on a net basis and thus excluded from revenues.
Foreign Currency	Foreign Currency For international subsidiaries whose functional currency is not the U.S. Dollar, the Company re-measures the monetary assets and liabilities of these subsidiaries to U.S. Dollars using rates of exchange in effect at the balance sheet date. Nonmonetary assets and liabilities are re-measured to U.S. Dollars using historical exchange rates, and other accounts are re-measured using average exchange rates in effect during each period presented. The effects of foreign currency translation adjustments are included in stockholders’ equity as a component of accumulated other comprehensive loss on the accompanying consolidated balance sheets, and related periodic movements are summarized as a line item in the consolidated statements of comprehensive loss. The Company records net gains and losses resulting from foreign exchange transactions as a component of other income, net. Aggregate foreign currency gains (losses) included in determining net loss were $( 137 ) a nd $( 127 ) in 2023 and 2022 , respectively.
Income Taxes	Income Taxes The Company accounts for income taxes using the asset and liability method. Under this method, deferred tax assets and liabilities are determined based on differences between the financial statement and tax basis of assets and liabilities and net operating loss and credit carryforwards using enacted tax rates in effect for the year in which the differences are expected to reverse. Valuation allowances are established when necessary to reduce deferred tax assets to the amounts expected to be realized. The Company accounts for uncertain tax positions using a more-likely-than-not threshold for financial statement recognition and measurement of tax positions taken or expected to be taken in a tax return. The Company establishes a liability for tax-related uncertainties based on estimates of whether, and the extent to which, additional taxes will be due. The Company records an income tax liability, if any, for the difference between the benefit recognized and measured and the tax position taken or expected to be taken on the Company’s tax returns. To the extent that the assessment of such tax positions changes, the change in estimate is recorded in the period in which the determination is made. The liability is adjusted in light of changing facts and circumstances, such as the outcome of a tax audit. The Compa ny recognizes interest and penalties related to uncertain tax positions as income tax expense, though such amounts were no t material in 2023 or 2022. The Company does not expect that changes in the liability for uncertain tax positions for the next twelve months will have a material impact on the Company’s consolidated financial position or results of operations.
Segment Reporting	Segment Reporting The Company defines the term “chief operating decision maker” to be the Company's Chief Executive Officer. The Company's 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.
Borrowings	Borrowings The Company accounted for its Paycheck Protection Program ("PPP") Loan as debt under the guidance in Accounting Standards Codification 470, Debt. As such, the outstanding amount was reflected as a note payable in the Company’s consolidated balance sheets, the proceeds were reflected under financing activities in the Company’s consolidated statement of cash flows and interest expense was accrued and recognized in the Company’s statement of operations. An aggregate principal amount of $ 3,117 of the Loan was forgiven in January 2022 and the Company repaid the remaining outstanding balance of approximately $ 200 in February 2022. The forgiveness of a $ 3,117 of the PPP Loan amount in January 2022 was reflected as a gain on debt extinguishment in the Company’s statement of operations and as an adjustment to cash from operating activities in the Statements of Cash Flows. The $200 repayment was reflected as a financing activity in the Statements of Cash Flows. Refer to Note 9 for fu rther information.
Recently Adopted Accounting Pronouncements	Recently Adopted Accounting Pronouncements On January 1, 2023, the Company adopted Accounting Standards Update ("ASU") 2016-13, Financial Instruments – Credit Losses – Measurement of Credit Losses on Financial Instruments (Topic 326) , using the modified retrospective transition method. Upon adoption, the Company changed its impairment model to utilize a forward-looking current expected credit losses model in place of the incurred loss methodology for financial instruments measured at amortized cost, primarily the Company’s accounts receivable. The cumulative effect from adoption was immaterial to the Company’s consolidated financial statements.
Recent Accounting Pronouncements Not Yet Effective	Recent Accounting Pronouncements Not Yet Effective In November 2023, the Financial Standards Accounting Board ("FASB") issued ASU 2023-07, Segment Reporting – Improvements to Reportable Segment Disclosures (Topic 280) ("ASU 2023-07"). ASU 2023-07 expands annual and interim disclosure requirements for reportable segments, primarily through enhanced disclosures about significant segment expenses. ASU 2023-07 is effective for our annual periods beginning January 1, 2024, and for interim periods beginning January 1, 2025, with early adoption permitted. The Company is evaluating the impact of this guidance on its consolidated financial statements and related disclosures. In December 2023, the FASB issued ASU 2023-09, Income Taxes – Improvements to Income Tax Disclosures (Topic 740) ("ASU 2023-09"). ASU 2023-09 requires enhanced annual disclosures regarding the rate reconciliation and income taxes paid information. ASU 2023-09 is effective for annual periods beginning after December 15, 2024 and may be adopted on a prospective or retrospective basis. Early adoption is permitted. The Company is evaluating the impact of this guidance on its consolidated financial statements and related disclosures.

Summary of Significant Accoun_3

Summary of Significant Accounting Policies (Tables)	12 Months Ended
	Dec. 31, 2023
Accounting Policies [Abstract]
Schedule of Changes in Allowance for Doubtful Accounts	The following are changes in the allowance for credit losses for the periods presented: Years Ended December 31, 2023 2022 Balances at beginning of year $ 736 $ 786 Addition to (reduction in) expense 29 16 Write-offs and other deductions ( 264 ) ( 66 ) Balances at end of year $ 501 $ 736
Schedule of Account Balances Measured at Fair Value on Recurring Basis	Account balances measured at fair value on a recurring basis include the following as of the dates presented: December 31, 2023 2022 Level 1 Level 2 Level 3 Level 1 Level 2 Level 3 Cash equivalents: Money market funds $ 10,548 $ — $ — $ 26,645 $ — $ —

Revenues (Tables)

Revenues (Tables)	12 Months Ended
	Dec. 31, 2023
Revenue from Contract with Customer [Abstract]
Expected Future Revenue for Subscription Services Related to Performance Obligations Unsatisfied or Partially Unsatisfied	Expected future revenues for subscription services related to performance obligations that are unsatisfied (or partially unsatisfied) as of December 31, 2023 were as follows: Subscription Services Revenues 2024 $ 1,015 2025 268 Total $ 1,283
Disaggregation of Revenues, Net	Revenues, net by geographic area, based on the billing location of the customer, were as follows for the periods presented: Years Ended December 31, 2023 2022 United States of America $ 14,213 $ 15,867 United Kingdom 2,038 2,272 Other (1) 1,480 1,880 Total revenues, net $ 17,731 $ 20,019 (1) No individual country within the “Other” category accounted for 10% or more of revenues, n et for any period presented. Revenues, net by nature of services performed were as follows for the periods presented: Years Ended December 31, 2023 2022 Subscriptions $ 10,585 $ 12,722 Strategic agreements 7,146 7,297 Total revenues, net $ 17,731 $ 20,019 Advertisers from outside of the United States represented 20 % and 21 % of total revenues for the years ended December 31, 2023 and 2022, respectively. The New Google Revenue Share Agreement accounted for approximately 40 % and 36 % for the years ended December 31, 2023 and 2022, respectively. Additionally, two customers accounted for approximately 24 % of total revenues for the year ended December 31, 2023. No additional customers represented greater than 10% of the Company's revenues for the years ended December 31, 2023 and 2022.
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 year ended December 31, 2023 were as follows: Deferred Costs to Obtain Contracts Deferred Costs to Fulfill Contracts Balances at December 31, 2022 $ 344 $ 131 Costs deferred 207 70 Amortization ( 263 ) ( 103 ) Balances at December 31, 2023 $ 288 $ 98

Stock-Based Compensation Expens

Stock-Based Compensation Expense (Tables)	12 Months Ended
	Dec. 31, 2023
Share-Based Payment Arrangement [Abstract]
Summary of Stock-based Compensation Expense	Stock-based compensation expense was allocated as follows: Years Ended December 31, 2023 2022 (in thousands) Cost of revenues $ 307 $ 481 Sales and marketing 502 596 Research and development 825 996 General and administrative 1,372 1,482 $ 3,006 $ 3,555
Summary of Stock Option Activity	A summary of stock option activity under the 2006 Plan and the 2013 Plan is as follows: Options Outstanding Number of Shares Weighted Average Exercise Price Per Share Weighted Average Remaining Contract Term (in Years) Aggregate Intrinsic Value Balance at December 31, 2021 383 $ 23.23 4.85 $ — Options forfeited and cancelled ( 46 ) 49.87 — Balance at December 31, 2022 337 $ 19.59 4.45 $ — Options forfeited and cancelled ( 16 ) 76.91 — Balance at December 31, 2023 321 $ 16.78 3.63 $ — Options exercisable as of December 31, 2023 321 $ 16.78 3.63 Options vested as of December 31, 2023 321 16.78 3.63 Options vested and expected to vest as of December 31, 2023 321 16.78 3.63
Summary of RSU Activity	A summary of RSU activity under the 2013 Plan and Amended and Restated Plan is as follows: RSUs Outstanding Number of Shares Weighted Average Grant Date Fair Value Per Unit Granted and unvested at December 31, 2021 1,542 $ 4.60 RSUs granted 1,142 1.90 RSUs vested ( 594 ) 3.72 RSUs cancelled and withheld to cover taxes ( 276 ) 5.91 Granted and unvested at December 31, 2022 1,814 $ 2.99 RSUs granted 1,482 1.23 RSUs vested ( 825 ) 2.97 RSUs cancelled and withheld to cover taxes ( 746 ) 2.99 Granted and unvested at December 31, 2023 1,725 $ 1.48

Balance Sheet Components (Table

Balance Sheet Components (Tables)	12 Months Ended
	Dec. 31, 2023
Balance Sheet Components [Abstract]
Components of Property and Equipment	The following table shows the components of property and equipment as of the dates presented: December 31, Estimated Useful Life 2023 2022 Software, including internally developed software 3 years $ 34,972 $ 33,073 Computer equipment 3 to 4 years 18,080 18,622 Leasehold improvements Shorter of useful life or lease term 512 512 Office equipment, furniture and fixtures 3 to 5 years 94 630 Total property and equipment 53,658 52,837 Less: Accumulated depreciation and amortization ( 50,262 ) ( 49,624 ) Less: Accumulated impairment losses ( 3,276 ) — Property and equipment, net $ 120 $ 3,213
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: December 31, 2023 2022 Accrued salary and payroll-related expenses $ 872 $ 1,460 Accrued liabilities 376 535 Income taxes payable 192 464 Advanced billings and customer credits (1) 636 1,016 Other 23 38 Total accrued expenses and other current liabilities $ 2,099 $ 3,513 (1) During the year ended December 31, 2023 the Company wrote off customer credit balances of $ 443 as credits to bad debt expense. No customer credit balances were written off during the year ended December 31, 2022.

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	12 Months Ended
	Dec. 31, 2023
Fair Value Disclosures [Abstract]
Schedule of Account Balances Measured at Fair Value on Recurring Basis	Account balances measured at fair value on a recurring basis include the following as of the dates presented: December 31, 2023 2022 Level 1 Level 2 Level 3 Level 1 Level 2 Level 3 Cash equivalents: Money market funds $ 10,548 $ — $ — $ 26,645 $ — $ —

Leases (Tables)

Leases (Tables)	12 Months Ended
	Dec. 31, 2023
Leases [Abstract]
Maturities of operating lease liabilities	The maturities of operating lease liabilities as of December 31, 2023 are as follows: Operating Leases 2024 $ 1,584 2025 396 Total lease payments 1,980 Less: Amount representing imputed interest ( 68 ) Present value of lease liabilities 1,912 Less: Current portion of lease liabilities ( 1,518 ) Non-current portion of lease liabilities $ 394
Supplemental Cash Flow Information Related to Leases	Supplemental cash flow information related to operating leases was as follows: Years Ended December 31, 2023 2022 Cash paid for amounts included in the measurement of lease liabilities: Operating cash flows from operating leases $ 1,842 $ 3,974 ROU assets obtained in exchange for lease liabilities: $ 161 $ 5,015

Income Taxes (Tables)

Income Taxes (Tables)	12 Months Ended
	Dec. 31, 2023
Income Tax Disclosure [Abstract]
Schedule of Components of Loss Before Benefit from or Provision for Income Taxes	The components of the Company’s loss before provision for (benefit from) income taxes are as follows: Years Ended December 31, 2023 2022 United States of America $ ( 21,851 ) $ ( 18,455 ) International ( 216 ) 533 Loss before provision for (benefit from) income taxes $ ( 22,067 ) $ ( 17,922 )
Schedule of Components of Benefit from or Provision for Income Taxes	The components of the provision for (benefit from) income taxes were as follows: Years Ended December 31, 2023 2022 Current income tax provision: State $ 10 $ 25 Foreign ( 90 ) 232 Total current income tax provision ( 80 ) 257 Deferred income tax benefit: Foreign ( 70 ) 48 Total deferred income tax benefit ( 70 ) 48 Provision for (benefit from) income taxes $ ( 150 ) $ 305
Differences in Total Benefit from or Provision for Income Taxes	The differences in the total provision for (benefit from) income taxes that would result from applying the 21 % federal statutory rate in 2023 and 2022 to the loss before provision for income taxes and the reported provision for income taxes were as follows: Years Ended December 31, 2023 2022 Tax benefit at U.S. statutory rate $ ( 4,634 ) $ ( 3,763 ) Change in valuation allowance 2,131 6,009 Stock-based compensation 461 ( 6 ) Uncertain tax positions ( 31 ) ( 32 ) State income taxes, net of federal benefit ( 637 ) ( 1,288 ) Foreign income and withholding taxes 147 8 Other permanent differences 154 81 Expired other credits 2,269 — PPP loan forgiveness — ( 667 ) Provision to return adjustments ( 10 ) ( 37 ) Provision for (benefit from) income taxes $ ( 150 ) $ 305
Schedule of Components of Deferred Tax Assets and Liabilities	Major components of the Company’s deferred tax assets and liabilities as of December 31, 2023 and 2022 were as follows: December 31, 2023 2022 Non-current deferred tax assets: Net operating loss $ 41,327 $ 37,783 Research and development credits 9,820 9,820 Other credits 1,292 4,165 Operating lease liabilities 516 1,037 Stock-based compensation 983 1,164 Property and equipment and intangible assets 956 — Capitalized research and development 1,709 912 Accruals and reserves 68 133 Gross non-current deferred tax assets 56,671 55,014 Right-of-use assets, operating leases ( 516 ) ( 1,037 ) Property and equipment and intangible assets - ( 23 ) Total non-current deferred tax liabilities ( 516 ) ( 1,060 ) Total deferred tax assets 56,155 53,954 Valuation allowance ( 56,055 ) ( 53,924 ) Net deferred tax assets (liabilities) $ 100 $ 30
Schedule of Changes in Uncertain Tax Positions	The aggregate changes in the balance of gross uncertain tax positions were as follows: Ending balance as of December 31, 2021 $ 9,055 Decrease in balances related to lapses in statutes of limitations ( 94 ) Ending balance as of December 31, 2022 8,961 Increase in balances related to tax positions taken during the prior period 30 Decrease in balances related to lapses in statutes of limitations ( 31 ) Ending balance as of December 31, 2023 $ 8,960 It is reasonably possible that uncertain tax positions existing as of

Net Loss Per Share Available _2

Net Loss Per Share Available to Common Stockholders (Tables)	12 Months Ended
	Dec. 31, 2023
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: Years Ended December 31, 2023 2022 Net loss available to common stockholders $ ( 21,917 ) $ ( 18,227 ) Weighted average number of shares, basic and diluted 17,656 15,891 Basic and diluted net loss per common share available to common stockholders $ ( 1.24 ) $ ( 1.15 )
Schedule of Potential Shares 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: Years Ended December 31, 2023 2022 Options to purchase common stock 321 337 Unvested RSUs 1,725 1,814 Total 2,046 2,151

Summary of Significant Accoun_4

Summary of Significant Accounting Policies - Additional Information (Details) $ / shares in Units, $ in Thousands			1 Months Ended		3 Months Ended		12 Months Ended
	Feb. 28, 2022 USD ($)	Aug. 31, 2021 USD ($)	Jul. 31, 2021 USD ($) $ / shares shares	Feb. 28, 2021 USD ($) $ / shares shares	Sep. 30, 2023 Employee	Sep. 30, 2020 Employee	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($) $ / shares shares	Dec. 31, 2020 USD ($) $ / shares shares	Dec. 31, 2019 USD ($) $ / shares shares	Jan. 31, 2022 USD ($)	Dec. 31, 2021	Aug. 03, 2021 USD ($)	Jul. 15, 2021 USD ($)	May 31, 2020 USD ($)
Summary Of Significant Accounting Policies [Line Items]
Net loss							$ (21,917)	$ (18,227)
Accumulated deficit							(344,251)	(322,334)
Cash, cash equivalents and restricted cash							$ 11,363
Restructuring reducation plan description							The 2023 Restructuring Plan resulted in the reduction of the Company's global employees by approximately 64 full-time employees during the second half of 2023, reducing its total headcount by approximately 37% from 172 as of June 30, 2023 to 108 as of December 31, 2023.
Repayment of loan	$ 200
Aggregate gross sales price													$ 22,800	$ 40,000
Common stock sold under agreement | shares | shares				1,186,000					2,726,000	658,000
Offering costs				$ 157				95	$ 463	$ 210
Weighted average sales price (in dollars per share) | $ / shares				$ 2.68					$ 2.92	$ 2.82
Net proceeds from common stock sold				$ 3,025				1,333	$ 7,500	$ 1,643
Allowance for potential customer revenue credits							$ 12	110
Unrealized gains (losses) on money market funds							0	0
Payments to develop software							1,906	1,853
Amortization of capitalized costs							1,701	1,810
Unamortized internally developed software costs, including construction in progress							3,276	3,071
Uncertain tax position							0	0
Impairment loss on long-lived assets							3,276	0
Advertising and promotion expense							909	653
Contributions by employer							65	69
Aggregate foreign currency (losses) gains							$ (137)	(127)
At-the-market Offering [Member]
Summary Of Significant Accounting Policies [Line Items]
Aggregate gross sales price													50,000
Accounting Standards Update 2019-12 [Member]
Summary Of Significant Accounting Policies [Line Items]
Accounting standards update, adopted [true false]												true
Accounting standards update, immaterial effect [true false]												true
Software and Software Development Costs [Member]
Summary Of Significant Accounting Policies [Line Items]
Property, plant and equipment, useful life							3 years
Money Market Funds [Member] | Fair Value, Inputs, Level 1 [Member]
Summary Of Significant Accounting Policies [Line Items]
Cash and cash equivalents, fair value disclosure							$ 10,548	$ 26,645
Google [Member] | Accounts Receivable [Member] | Customer Concentration Risk [Member]
Summary Of Significant Accounting Policies [Line Items]
Percentage of concentration risk							46%	40%
Google [Member] | Sales Revenue, Net [Member] | Customer Concentration Risk [Member]
Summary Of Significant Accounting Policies [Line Items]
Percentage of concentration risk							40%	36%
Maximum [Member]
Summary Of Significant Accounting Policies [Line Items]
Aggregate gross sales price		$ 50,000					$ 50,000						100,000
Offering costs		$ 100,000
Paycheck Protection Program [Member]
Summary Of Significant Accounting Policies [Line Items]
Aggregate principal amount of the loan											$ 3,117
Paycheck Protection Program [Member] | Harvest Small Business Finance, LLC [Member]
Summary Of Significant Accounting Policies [Line Items]
Aggregate principal amount of the loan															$ 3,320
Restructuring and Reduction in Force Plan [Member] | 2020 Restructuring Plan [Member]
Summary Of Significant Accounting Policies [Line Items]
Expected reduction of workforce | Employee					64	60
United Kingdom [Member]
Summary Of Significant Accounting Policies [Line Items]
Contributions by employer							$ 242	$ 91
2021 Equity Distribution Agreement [Member]
Summary Of Significant Accounting Policies [Line Items]
Common stock sold under agreement | shares | shares			4,316,000
Weighted average sales price (in dollars per share) | $ / shares			$ 9.27
Net proceeds from common stock sold			$ 38,800
2021 Equity Distribution Agreement [Member] | JMP Securities [Member]
Summary Of Significant Accounting Policies [Line Items]
Aggregate gross sales price													$ 50,000
Common stock sold under agreement | shares | shares								1,100,000
Offering costs								$ 100
Weighted average sales price (in dollars per share) | $ / shares								$ 1.33
Net proceeds from common stock sold								$ 1,300
Net of securities fees			$ 1,200
2021 Equity Distribution Agreement [Member] | JMP Securities [Member] | Maximum [Member] | At-the-market Offering [Member]
Summary Of Significant Accounting Policies [Line Items]
Aggregate gross sales price														$ 40,000

Summary of Significant Accoun_5

Summary of Significant Accounting Policies - Changes in Allowance for Doubtful Accounts (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Accounting Policies [Abstract]
Balances	$ 736	$ 786
Reductions to expense	29	16
Write-offs and other deductions	(264)	(66)
Balances	$ 501	$ 736

Summary of Significant Accoun_6

Summary of Significant Accounting Policies - Fair Value Measurement on a Recurring Basis (Details) - Money Market Funds [Member] - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Fair Value, Inputs, Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents, fair value disclosure	$ 10,548	$ 26,645
Fair Value, Inputs, Level 1 [Member] | Fair Value, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents, fair value disclosure	10,548	26,645
Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents, fair value disclosure	0	0
Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents, fair value disclosure	$ 0	$ 0

Revenues - Additional Informati

Revenues - Additional Information (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2023 USD ($) Customer	Dec. 31, 2022 USD ($)
Disaggregation Of Revenue [Line Items]
Subscription contracts term	1 year
Unsatisfied performance obligation on subscription contract term	1 year
Revenues	$ 17,731	$ 20,019
Number of New customer | Customer	0
Remaining performance obligation	$ 1,283
Accounts receivable		1,788
Accounts receivable, after allowance for credit loss, current	$ 3,864	4,521
Deferred costs expected period of benefit	30 months
Impairment losses related to costs capitalized	$ 0	0
Google [Member]
Disaggregation Of Revenue [Line Items]
Revenues	$ 7,150	$ 7,150
Customer Concentration Risk [Member] | Revenue, Segment Benchmark [Member] | Two Customer [Member]
Disaggregation Of Revenue [Line Items]
Concentration Risk, Percentage	24%
Customer Concentration Risk [Member] | Revenue, Segment Benchmark [Member] | Google [Member]
Disaggregation Of Revenue [Line Items]
Concentration Risk, Percentage	40%	36%
Outside United States [Member] | Customer Concentration Risk [Member] | Revenue, Segment Benchmark [Member]
Disaggregation Of Revenue [Line Items]
Concentration Risk, Percentage	20%	21%
Maximum [Member]
Disaggregation Of Revenue [Line Items]
Subscription contracts term	2 years
Advance advertiser invoicing period	12 months
Minimum [Member]
Disaggregation Of Revenue [Line Items]
Advance advertiser invoicing period	3 months
Subscription remaining performance obligations expected duration	1 year

Revenues - Expected Future Reve

Revenues - Expected Future Revenue for Subscription Services Related to Performance Obligations Unsatisfied or Partially Unsatisfied (Details) $ in Thousands	Dec. 31, 2023 USD ($)
Disaggregation Of Revenue [Line Items]
Subscription Services Revenues	$ 1,283
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2023-01-01
Disaggregation Of Revenue [Line Items]
Subscription Services Revenues	1,015
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2024-01-01
Disaggregation Of Revenue [Line Items]
Subscription Services Revenues	$ 268
Remaining performance obligation, satisfaction period	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2025-01-01
Disaggregation Of Revenue [Line Items]
Remaining performance obligation, satisfaction period	1 year

Revenues - Expected Future Re_2

Revenues - Expected Future Revenue for Subscription Services Related to Performance Obligations Unsatisfied or Partially Unsatisfied (Details1) $ in Thousands	Dec. 31, 2023 USD ($)
Disaggregation of Revenue [Line Items]
Subscription Services Revenues	$ 1,283

Revenues - Additional Informa_2

Revenues - Additional Information (Details1) - USD ($) $ in Thousands	Dec. 31, 2023	Sep. 30, 2021
Disaggregation Of Revenue [Line Items]
Remaining performance obligation	$ 1,283
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2023-01-01
Disaggregation Of Revenue [Line Items]
Remaining performance obligation	1,015
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2024-01-01
Disaggregation Of Revenue [Line Items]
Remaining performance obligation	$ 268
Remaining performance obligation, satisfaction period	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2025-01-01
Disaggregation Of Revenue [Line Items]
Remaining performance obligation, satisfaction period	1 year
Google [Member] | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2021-10-01
Disaggregation Of Revenue [Line Items]
Remaining performance obligation, satisfaction period		3 months
Google [Member] | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2022-01-01
Disaggregation Of Revenue [Line Items]
Remaining performance obligation, satisfaction period		1 year
Google [Member] | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2023-01-01
Disaggregation Of Revenue [Line Items]
Remaining performance obligation, satisfaction period		1 year
Google [Member] | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2024-01-01
Disaggregation Of Revenue [Line Items]
Remaining performance obligation	$ 5,363
Remaining performance obligation, satisfaction period		1 year

Revenues - Disaggregation of Re

Revenues - Disaggregation of Revenues (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2023	Dec. 31, 2022
Disaggregation Of Revenue [Line Items]
Revenues		$ 17,731	$ 20,019
Subscriptions [Member]
Disaggregation Of Revenue [Line Items]
Revenues		10,585	12,722
Strategic Agreements [Member]
Disaggregation Of Revenue [Line Items]
Revenues		7,146	7,297
United States of America [Member]
Disaggregation Of Revenue [Line Items]
Revenues		14,213	15,867
United Kingdom [Member]
Disaggregation Of Revenue [Line Items]
Revenues		2,038	2,272
Other [Member]
Disaggregation Of Revenue [Line Items]
Revenues	[1]	$ 1,480	$ 1,880
[1] No individual country within the “Other” category accounted for 10% or more of revenues, n et for any period presented.

Revenues - Changes in Balances

Revenues - Changes in Balances of Deferred Costs to Obtain and Fulfill Contracts (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2023 USD ($)
Deferred Costs to Obtain Contracts [Member]
Capitalized Contract Cost [Line Items]
Balance at beginning of period	$ 344
Costs deferred	207
Amortization	(263)
Balance at end of period	288
Deferred Costs to Fulfill Contracts [Member]
Capitalized Contract Cost [Line Items]
Balance at beginning of period	131
Costs deferred	70
Amortization	(103)
Balance at end of period	$ 98

Stock-based Compensation - Summ

Stock-based Compensation - Summary of Stock Option Activity (Details) - 2006 and 2013 Plan [Member] - Stock Options [Member] - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Number of Shares
Balance at beginning of period	337	383
Options forfeited and cancelled	(16)	(46)
Balance at end of period	321	337	383
Options exercisable as of December 31, 2023	321
Options vested as of December 31, 2023	321
Options vested and expected to vest as of December 31, 2023	321
Weighted Average Exercise Price Per Share
Balance at beginning of period	$ 19.59	$ 23.23
Options forfeited and cancelled	76.91	49.87
Balance at end of period	16.78	$ 19.59	$ 23.23
Options exercisable as of December 31, 2023	16.78
Options vested as of December 31, 2023	16.78
Options vested and expected to vest as of December 31, 2023	$ 16.78
Weighted Average Remaining Contractual Term (in Years)
Options outstanding	3 years 7 months 17 days	4 years 5 months 12 days	4 years 10 months 6 days
Options exercisable	3 years 7 months 17 days
Options vested	3 years 7 months 17 days
Options vested and expected to vest	3 years 7 months 17 days
Aggregate Intrinsic Value
Options outstanding		$ 0	$ 0

Stock-based Compensation - Su_2

Stock-based Compensation - Summary of RSU Activity (Details) - 2013 Plan [Member] - RSUs [Member] - $ / shares shares in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Number of Shares
Granted and unvested at beginning of period	1,814	1,542
RSUs granted	1,482	1,142
RSUs vested	(825)	(594)
RSUs cancelled and withheld to cover taxes	(746)	(276)
Granted and unvested at end of period	1,725	1,814
Weighted Average Grant Date Fair Value Per Unit
Granted and unvested at beginning of period	$ 2.99	$ 4.6
RSUs granted	1.23	1.9
RSUs vested	2.97	3.72
RSUs cancelled and withheld to cover taxes	2.99	5.91
Granted and unvested at end of period	$ 1.48	$ 2.99

Stock-Based Compensation - Su_3

Stock-Based Compensation - Summary of Stock-based Compensation Expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Share-Based Payment Arrangement, Expense	$ 3,006	$ 3,555
Cost of Revenues [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Share-Based Payment Arrangement, Expense	307	481
Sales and Marketing [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Share-Based Payment Arrangement, Expense	502	596
Research and Development [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Share-Based Payment Arrangement, Expense	825	996
General and Administrative [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Share-Based Payment Arrangement, Expense	$ 1,372	$ 1,482

Stock-Based Compensation - Addi

Stock-Based Compensation - Additional Information (Details) - USD ($) $ in Thousands				12 Months Ended
	Mar. 24, 2023	Jan. 01, 2023	Feb. 28, 2013	Dec. 31, 2023	Dec. 31, 2022
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Common Stock, Capital Shares Reserved for Future Issuance	425,000		643,000
Percentage of increase in outstanding common shares	5%		5%
Increase in shares available for issuance (in shares)		861,000
Unrecognized compensation cost related to options				$ 0
Share-based compensation arrangement by share-based payment award, options, vested in period, fair value				31	$ 31
Software and Software Development Costs [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Share-based payment arrangement, amount capitalized				$ 99	$ 113
Maximum [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Increase in shares available for issuance, authorized (in shares)			100,000
2013 Employee Stock Purchase Plan [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Share-based payment arrangement, amount capitalized			$ 143
Increase in shares available for issuance (in shares)		100,000
Percentage of lesser of fair market value of common stock			85%
Percentage of increase in outstanding shares			1%
Description of Amended and Restated 2013 Employee Stock Purchase Plan				On March 24, 2023, the Board approved the Amended and Restated 2013 Employee Stock Purchase Plan ("Amended and Restated ESPP") which provides for six-month purchase periods ending in May and November of each year with the purchase price for each share of common stock purchased being 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. Under the Amended and Restated ESPP, 432 shares of common stock have been reserved for issuance.
RSUs [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Share-based compensation, weighted average recognized period				1 year 2 months 12 days
Unrecognized compensation cost related to RSUs				$ 1,431

Restructuring Activities - Addi

Restructuring Activities - Additional Information (Details) $ in Thousands	3 Months Ended			6 Months Ended	12 Months Ended
	Dec. 31, 2023 Employee	Sep. 30, 2023 Employee	Sep. 30, 2020 Employee	Jun. 30, 2023 Employee	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)
Restructuring Cost And Reserve [Line Items]
Research and development					$ 10,235	$ 11,832
Cost of revenues					11,635	12,795
General and administrative					8,871	10,396
Sales and marketing					6,520	6,997
2020 Restructuring Plan [Member]
Restructuring Cost And Reserve [Line Items]
Restructuring related expenses					1,821	266
Research and development					171
Cost of revenues						17
General and administrative						$ 78
2023 Restructuring Plan [Member]
Restructuring Cost And Reserve [Line Items]
Research and development					837
Cost of revenues					673
General and administrative					189
Sales and marketing					$ 122
Restructuring and Reduction in Force Plan [Member] | 2020 Restructuring Plan [Member]
Restructuring Cost And Reserve [Line Items]
Expected reduction of workforce | Employee		64	60
Restructuring and Reduction in Force Plan [Member] | 2023 Restructuring Plan [Member]
Restructuring Cost And Reserve [Line Items]
Expected reduction of workforce | Employee	108			172
Percentage headcount reduction					37%

Balance Sheet Components - Comp

Balance Sheet Components - Components of Property and Equipment (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Property Plant And Equipment [Line Items]
Property and equipment, gross	$ 53,658	$ 52,837
Less: Accumulated depreciation and amortization	(50,262)	(49,624)
Less: Accumulated impairment losses	(3,276)	0
Property and equipment, net	120	3,213
Software, Including Internally Developed Software [Member]
Property Plant And Equipment [Line Items]
Property and equipment, gross	$ 34,972	33,073
Estimated useful life	3 years
Computer Equipment [Member]
Property Plant And Equipment [Line Items]
Property and equipment, gross	$ 18,080	18,622
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
Leasehold Improvements [Member]
Property Plant And Equipment [Line Items]
Property and equipment, gross	$ 512	512
Office Equipment, Furniture and Fixtures [Member]
Property Plant And Equipment [Line Items]
Property and equipment, gross	$ 94	$ 630
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

Balance Sheet Components - Addi

Balance Sheet Components - Additional Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Offsetting Assets [Line Items]
Depreciation and amortization	$ 1,720	$ 2,257
Impairment loss on long-lived assets	3,276	0
Advanced billings and accounts receivable credits reclassified from the caption 'Other'	$ 636	$ 1,016

Balance Sheet Components - Co_2

Balance Sheet Components - Components of Accrued Expenses and Other Current Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Balance Sheet Components [Abstract]
Accrued salary and payroll-related expenses	$ 872	$ 1,460
Accrued liabilities	376	$ 535
Finance Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration]		Operating Lease, Right-of-Use Asset	Operating Lease, Right-of-Use Asset
Income taxes payable	192	$ 464
Advanced billings and accounts receivable credits	636	1,016
Other	23	38
Total accrued expenses and other current liabilities	$ 2,099	$ 3,513

Balance Sheet Components - Co_3

Balance Sheet Components - Components of Accrued Expenses and Other Current Liabilities - (Parenthetical) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Balance Sheet Components [Abstract]
Wrote off credit balance	$ 443	$ 0

Fair Value Measurements - Sched

Fair Value Measurements - Schedule of Account Balances Measured at Fair Value on Recurring Basis (Details) - Money Market Funds [Member] - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Level 1 [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Cash equivalents	$ 10,548	$ 26,645
Fair Value, Measurements, Recurring [Member] | Level 1 [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Cash equivalents	10,548	26,645
Fair Value, Measurements, Recurring [Member] | Level 2 [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Cash equivalents	0	0
Fair Value, Measurements, Recurring [Member] | Level 3 [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Cash equivalents	$ 0	$ 0

Fair Value Measurements - Addit

Fair Value Measurements - Additional Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Fair Value Disclosures [Abstract]
Unrealized gains (losses) on money market funds	$ 0	$ 0

Borrowing - Additional Informat

Borrowing - Additional Information (Details) - USD ($) $ in Thousands		1 Months Ended	12 Months Ended
	May 31, 2020	Feb. 28, 2022	Dec. 31, 2023	Jan. 31, 2022
Debt Instrument [Line Items]
Loan, payment description			the Company repaid the remaining outstanding balance of approximately $200 in February 2022.
Paycheck Protection Program [Member]
Debt Instrument [Line Items]
Aggregate principal amount of the loan				$ 3,117
Repayments of Debt		$ 200
Paycheck Protection Program [Member] | Harvest Small Business Finance, LLC [Member]
Debt Instrument [Line Items]
Aggregate principal amount of the loan	$ 3,320
Loan, maturity period	2 years
Loan, interest rate	1%
Loan Forgiveness			$ 3,117

Shelf Registration and At-the_2

Shelf Registration and At-the-Market Offering - Additional Information (Details) - USD ($) $ / shares in Units, $ in Thousands			1 Months Ended		12 Months Ended
	Aug. 31, 2021	Jul. 15, 2021	Jul. 31, 2021	Feb. 28, 2021	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2020	Dec. 31, 2019	Aug. 03, 2021
Registration Payment Arrangement [Line Items]
Aggregate offering price		$ 40,000							$ 22,800
Issuance of common stock (in shares)				1,186,000			2,726,000	658,000
Proceeds from sales				$ 3,025		$ 1,333	$ 7,500	$ 1,643
Offering costs				$ 157		$ 95	$ 463	$ 210
Weighted average sales price (in dollars per share)				$ 2.68			$ 2.92	$ 2.82
Remaining shares available under Initial Registration Statement		37,000
Additional shares under Initial Registration Statement		$ 3,000
Additional amounts available to be sold							$ 0
Maximum [Member]
Registration Payment Arrangement [Line Items]
Aggregate offering price	$ 50,000				$ 50,000				100,000
Offering costs	$ 100,000
At-the-market Offering [Member]
Registration Payment Arrangement [Line Items]
Aggregate offering price									50,000
2021 Equity Distribution Agreement [Member]
Registration Payment Arrangement [Line Items]
Issuance of common stock (in shares)			4,316,000
Proceeds from sales			$ 38,800
Weighted average sales price (in dollars per share)			$ 9.27
JMP Securities [Member] | 2019 Equity Distribution Agreement [Member] | Maximum [Member]
Registration Payment Arrangement [Line Items]
Aggregate offering price					$ 13,000
Compensation percentage					5%
JMP Securities [Member] | 2021 Equity Distribution Agreement [Member]
Registration Payment Arrangement [Line Items]
Aggregate offering price									$ 50,000
Compensation percentage		3%
Issuance of common stock (in shares)						1,100,000
Proceeds from sales						$ 1,300
Offering costs						$ 100
Weighted average sales price (in dollars per share)						$ 1.33
Net of securities fees			$ 1,200
JMP Securities [Member] | 2021 Equity Distribution Agreement [Member] | At-the-market Offering [Member] | Maximum [Member]
Registration Payment Arrangement [Line Items]
Aggregate offering price		$ 40,000

Leases - Additional Information

Leases - Additional Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Lessee Lease Description [Line Items]
Right-of-use assets, operating leases	$ 1,912	$ 3,844
Lease Liability Adjusted Its Right Of Use Assets	565
Operating lease rental expense	$ 1,842	3,654
Weighted average discount rate, operating lease	6%
Sublease income		$ 587

Leases - Maturities of Lease Li

Leases - Maturities of Lease Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Maturities of Operating Lease Liabilities [Abstract]
2024	$ 1,584
2025	396
Total lease payments	1,980
Less: Amount representing imputed interest	(68)
Present value of lease liabilities	1,912
Less: Current portion of lease liabilities	(1,518)	$ (1,645)
Operating lease liabilities, non-current	$ 394	$ 2,199

Leases - Supplemental Cash Flow

Leases - Supplemental Cash Flow Information Related to Leases (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows from operating leases	$ 1,842	$ 3,974
ROU assets obtained in exchange for lease liabilities:
ROU assets obtained in exchange for lease liabilities:	$ 161	$ 5,015

Income Taxes - Schedule of Comp

Income Taxes - Schedule of Components of Loss Before Benefit from or Provision for Income Taxes (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Income Tax Disclosure [Abstract]
United States of America	$ (21,851)	$ (18,455)
International	(216)	533
Loss before provision for (benefit from) income taxes	$ (22,067)	$ (17,922)

Income Taxes - Schedule of Co_2

Income Taxes - Schedule of Components of Benefit from or Provision for Income Taxes (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Income Tax Disclosure [Abstract]
State, Current income tax provision	$ 10	$ 25
Foreign, Current income tax provision	(90)	232
Total, Current income tax provision	(80)	257
Foreign, Deferred income tax benefit	(70)	48
Total, Deferred income tax benefit	(70)	48
Benefit from income taxes	$ (150)	$ 305

Income Taxes - Additional Infor

Income Taxes - Additional Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent	21%	21%
Cumulative Change in Ownership, Percentage	50%
Cumulative Change in Ownership, Period	3 years
State Enterprise Zone Credits, Total	$ 1,123
State Enterprise Zone Credits, Expiration Year	2024
State Enterprise Zone Credits Unutilized, Total	$ 2,872
State Enterprise Zone Credits Unutilized, Expiration Year	2023
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount	$ 2,131	$ 6,009
Unrecognized Tax Benefits that Would Impact Effective Tax Rate	368
Uncertain tax positions, interest or penalties	984	$ 985
Federal Research and Development [Member]
Operating Loss Carryforwards, Total	$ 163,439
Operating Loss Carry Forwards, Expiration Year	2027
Tax Credit Carryforward, Amount	$ 6,123
Tax Credit Carryforward, Expiration Year	2026
State and Local Jurisdiction [Member]
Operating Loss Carryforwards, Total	$ 144,131
Operating Loss Carry Forwards, Expiration Year	2025
Tax Credit Carryforward, Amount	$ 6,451

Income Taxes - Differences in T

Income Taxes - Differences in Total Benefit from or Provision for Income Taxes (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Income Tax Disclosure [Abstract]
Tax benefit at U.S. statutory rate	$ (4,634)	$ (3,763)
Change in valuation allowance	2,131	6,009
Stock-based compensation	461	(6)
Uncertain tax positions	(31)	(32)
State income taxes, net of federal benefit	(637)	(1,288)
Foreign income and withholding taxes	147	8
Other permanent differences	154	81
Expired other credits	2,269	0
PPP loan forgiveness	0	(667)
Provision to return adjustments	(10)	(37)
Provision for (benefit from) income taxes	$ (150)	$ 305

Income Taxes - Schedule of Co_3

Income Taxes - Schedule of Components of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Non-current deferred tax assets:
Net operating loss	$ 41,327	$ 37,783
Research and development credits	9,820	9,820
Other credits	1,292	4,165
Operating lease liabilities	516	1,037
Stock-based compensation	983	1,164
Property and equipment and intangible assets	956	0
Capitalized research and development	1,709	912
Accruals and reserves	68	133
Gross non-current deferred tax assets	56,671	55,014
Right-of-use assets, operating leases	(516)	(1,037)
Property and equipment and intangible assets	0	(23)
Total non-current deferred tax liabilities	(516)	(1,060)
Total deferred tax assets	56,155	53,954
Valuation allowance	(56,055)	(53,924)
Net deferred tax assets (liabilities)	$ 100	$ 30

Income Taxes - Schedule of Chan

Income Taxes - Schedule of Changes in Uncertain Tax Positions (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Income Tax Disclosure [Abstract]
Balance	$ 8,961	$ 9,055
Increase in balances related to tax positions taken during the prior period	30
Decrease in balances related to lapses in statutes of limitations	(31)	(94)
Balance	$ 8,960	$ 8,961

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, $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Numerator:
Net loss available to common stockholders	$ (21,917)	$ (18,227)
Denominator:
Weighted average number of shares, basic	17,656,000	15,891,000
Weighted average number of shares, diluted	17,656,000	15,891,000
Net loss per share available to common stockholders:
Earnings Per Share, Basic	$ (1.24)	$ (1.15)
Earnings Per Share, Diluted	$ (1.24)	$ (1.15)

Net Loss Per Share Available _4

Net Loss Per Share Available to Common Stockholders - Schedule of Potential Shares of Common Shares Outstanding (Details) - shares shares in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Shares excluded from computation of diluted net loss per share (in shares)	2,046	2,151
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)	321	337
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)	1,725	1,814

Employee Benefit Plans - Additi

Employee Benefit Plans - Additional Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Defined Benefit Plan Disclosure [Line Items]
Contributions by employer	$ 65	$ 69
United Kingdom
Defined Benefit Plan Disclosure [Line Items]
Contributions by employer	$ 242	$ 91

Subsequent Event (Additional In

Subsequent Event (Additional Information) (Details) - Paycheck Protection Program [Member] - USD ($) $ in Thousands	1 Months Ended	12 Months Ended
	Feb. 28, 2022	Dec. 31, 2023
Subsequent Event [Line Items]
Repayments of Debt	$ 200
Harvest Small Business Finance, LLC [Member]
Subsequent Event [Line Items]
Loan Forgiveness		$ 3,117