AdTheorent Holding (ADTH) 10-Q 7 Nov 23 2023 Q3 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	9 Months Ended
	Sep. 30, 2023	Nov. 02, 2023
Document Information [Line Items]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Sep. 30, 2023
Document Fiscal Year Focus	2023
Document Fiscal Period Focus	Q3
Entity Registrant Name	AdTheorent Holding Company, Inc.
Entity Central Index Key	0001838672
Current Fiscal Year End Date	--12-31
Entity Current Reporting Status	Yes
Entity Filer Category	Accelerated Filer
Entity Shell Company	false
Entity Small Business	true
Entity Emerging Growth Company	true
Entity Ex Transition Period	false
Entity Common Stock, Shares Outstanding		88,241,898
Entity Interactive Data Current	Yes
Entity File Number	001-40116
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	85-3978415
Entity Address, Address Line One	330 Hudson Street
Entity Address, Address Line Two	13th Floor
Entity Address, City or Town	New York
Entity Address, State or Province	NY
Entity Address, Postal Zip Code	10013
City Area Code	800
Local Phone Number	804-1359
Document Quarterly Report	true
Document Transition Report	false
Common Stock, Par Value $0.0001 Per Share
Document Information [Line Items]
Title of 12(b) Security	Common stock, par value $0.0001 per share
Trading Symbol	ADTH
Security Exchange Name	NASDAQ
Warrants to Purchase Common Stock
Document Information [Line Items]
Title of 12(b) Security	Warrants to purchase common stock
Trading Symbol	ADTHW
Security Exchange Name	NASDAQ

CONDENSED CONSOLIDATED BALANCE

CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Current assets
Cash and cash equivalents	$ 74,339	$ 72,579
Accounts receivable, net	48,693	56,027
Income tax recoverable	177	145
Prepaid expenses	2,673	1,466
Total current assets	125,882	130,217
Property and equipment, net	465	520
Operating lease right-of-use asset	4,987	5,732
Investment in SymetryML Holdings	636	789
Customer relationships, net	1,119	4,475
Other intangible assets, net	7,854	6,708
Goodwill	34,842	34,842
Deferred income taxes, net	12,067	6,962
Other assets	308	359
Total assets	188,160	190,604
Current liabilities
Accounts payable	10,294	9,479
Accrued compensation	5,117	8,939
Accrued expenses	5,076	6,224
Operating lease liabilities, current	1,265	1,265
Total current liabilities	21,752	25,907
Warrants	862	2,298
Seller's Earn-Out	23	773
Operating lease liabilities, non-current	5,253	6,201
Total liabilities	27,890	35,179
Stockholders’ equity
Preferred stock, $0.0001 per share, 20,000,000 shares authorized, no shares issued and outstanding as of September 30, 2023 and December 31, 2022
Common stock, $0.0001 par value, 350,000,000 shares authorized; 88,206,048 and 86,968,309 shares issued and outstanding as of September 30, 2023 and December 31, 2022, respectively	9	9
Additional paid-in capital	89,746	83,566
Retained earnings	70,515	71,850
Total stockholders' equity	160,270	155,425
Total liabilities and stockholders' equity	$ 188,160	$ 190,604

CONDENSED CONSOLIDATED BALANC_2

CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - $ / shares	Sep. 30, 2023	Dec. 31, 2022
Statement of Financial Position [Abstract]
Preferred stock, par value	$ 0.0001	$ 0.0001
Preferred stock, shares authorized	20,000,000	20,000,000
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0
Common stock, par value	$ 0.0001	$ 0.0001
Common stock, shares authorized	350,000,000	350,000,000
Common stock, shares issued	88,206,048	86,968,309
Common stock, shares outstanding	88,206,048	86,968,309

CONDENSED CONSOLIDATED STATEMEN

CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Income Statement [Abstract]
Revenue	$ 40,890	$ 37,584	$ 111,151	$ 114,301
Operating expenses:
Platform operations	22,019	19,581	61,141	58,207
Sales and marketing	11,119	11,127	32,050	32,540
Technology and development	3,794	3,955	10,453	12,393
General and administrative	4,113	4,729	11,638	15,433
Total operating expenses	41,045	39,392	115,282	118,573
Loss from operations	(155)	(1,808)	(4,131)	(4,272)
Interest income (expense), net	707	97	1,750	(59)
Gain on change in fair value of Seller's Earn-Out	225	2,901	750	15,664
Gain on change in fair value of warrants	1,290	5,674	1,436	8,261
Gain on deconsolidation of SymetryML	0	0	0	1,939
Loss on change in fair value of SAFE Notes	0	0	0	(788)
Gain (loss) on fair value of investment in SymetryML Holdings	5	(39)	(153)	(49)
Other expense, net	(12)	(5)	(49)	(24)
Total other income, net	2,215	8,628	3,734	24,944
Net income (loss) before income taxes	2,060	6,820	(397)	20,672
(Provision) benefit for income taxes	(6,254)	(1,095)	(938)	540
Net (loss) income	(4,194)	5,725	(1,335)	21,212
Less: Net loss attributable to noncontrolling interest	0	0	0	550
Net (loss) income attributable to AdTheorent Holding Company, Inc.	$ (4,194)	$ 5,725	$ (1,335)	$ 21,762
(Loss) earnings per share:
Basic	$ (0.05)	$ 0.07	$ (0.02)	$ 0.25
Diluted	$ (0.05)	$ 0.06	$ (0.02)	$ 0.23
Weighted-average common shares outstanding:
Basic	88,175,813	86,492,025	87,869,345	86,003,514
Diluted	88,175,813	92,122,421	87,869,345	92,885,851

CONDENSED CONSOLIDATED STATEM_2

CONDENSED CONSOLIDATED STATEMENTS OF EQUITY (unaudited) - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-in Capital	Retained Earnings	Noncontrolling Interests
Balance at the beginning at Dec. 31, 2021	$ 111,883	$ 9	$ 70,778	$ 42,512	$ (1,416)
Balance at the beginning (in shares) at Dec. 31, 2021		85,743,994
Equity-based compensation	1,988		1,988
Seller's Earn-Out equity-based compensation	492		492
Conversion of SAFE Note into SymetryML Preferred Stock	3,938				3,938
SymetryML preferred Stock Issuance	400				400
Deconsolidation of SymetryML	(2,372)				(2,372)
Net (loss) income	(42,290)			(41,740)	(550)
Balance at the end at Mar. 31, 2022	74,039	$ 9	73,258	772	0
Balance at the end (in shares) at Mar. 31, 2022		85,743,994
Balance at the beginning at Dec. 31, 2021	111,883	$ 9	70,778	42,512	(1,416)
Balance at the beginning (in shares) at Dec. 31, 2021		85,743,994
Net (loss) income	21,212
Balance at the end at Sep. 30, 2022	145,222	$ 9	80,939	64,274	0
Balance at the end (in shares) at Sep. 30, 2022		86,691,430
Balance at the beginning at Mar. 31, 2022	74,039	$ 9	73,258	772	0
Balance at the beginning (in shares) at Mar. 31, 2022		85,743,994
Equity-based compensation	3,856		3,856
Seller's Earn-Out equity-based compensation	499		499
Exercises of options	183		183
Exercises of options (in shares)		355,629
Exercises of warrants (in shares)		10
Transaction cost adjustment	55		55
Net (loss) income	57,777			57,777
Balance at the end at Jun. 30, 2022	136,409	$ 9	77,851	58,549	0
Balance at the end (in shares) at Jun. 30, 2022		86,099,633
Equity-based compensation	2,783		2,783
Seller's Earn-Out equity-based compensation	373		373
Exercises of options	163		163
Exercises of options (in shares)		244,922
Vesting of restricted stock, net of shares withheld for taxes	(231)		(231)
Vesting of restricted stock, net of shares withheld for taxes (in shares)		346,875
Net (loss) income	5,725			5,725
Balance at the end at Sep. 30, 2022	145,222	$ 9	80,939	64,274	0
Balance at the end (in shares) at Sep. 30, 2022		86,691,430
Balance at the beginning at Dec. 31, 2022	155,425	$ 9	83,566	71,850	0
Balance at the beginning (in shares) at Dec. 31, 2022		86,968,309
Equity-based compensation	1,552		1,552
Exercises of options	57		57
Exercises of options (in shares)		80,520
Vesting of restricted stock, net of shares withheld for taxes	(399)		(399)
Vesting of restricted stock, net of shares withheld for taxes (in shares)		605,854
Shares issued under employee stock purchase plan	172		172
Shares issued under employee stock purchase plan (in shares)		111,433
Net (loss) income	(5,223)			(5,223)
Balance at the end at Mar. 31, 2023	151,584	$ 9	84,948	66,627	0
Balance at the end (in shares) at Mar. 31, 2023		87,766,116
Balance at the beginning at Dec. 31, 2022	$ 155,425	$ 9	83,566	71,850	0
Balance at the beginning (in shares) at Dec. 31, 2022		86,968,309
Exercises of options (in shares)	233,467
Net (loss) income	$ (1,335)
Balance at the end at Sep. 30, 2023	160,270	$ 9	89,746	70,515	0
Balance at the end (in shares) at Sep. 30, 2023		88,206,048
Balance at the beginning at Mar. 31, 2023	151,584	$ 9	84,948	66,627	0
Balance at the beginning (in shares) at Mar. 31, 2023		87,766,116
Equity-based compensation	1,932		1,932
Exercises of options	93		93
Exercises of options (in shares)		152,947
Vesting of restricted stock, net of shares withheld for taxes	(38)		(38)
Vesting of restricted stock, net of shares withheld for taxes (in shares)		51,834
Net (loss) income	8,082			8,082
Balance at the end at Jun. 30, 2023	161,653	$ 9	86,935	74,709	0
Balance at the end (in shares) at Jun. 30, 2023		87,970,897
Equity-based compensation	2,697		2,697
Vesting of restricted stock, net of shares withheld for taxes	(29)		(29)
Vesting of restricted stock, net of shares withheld for taxes (in shares)		114,179
Shares issued under employee stock purchase plan	143		143
Shares issued under employee stock purchase plan (in shares)		120,972
Net (loss) income	(4,194)			(4,194)
Balance at the end at Sep. 30, 2023	$ 160,270	$ 9	$ 89,746	$ 70,515	$ 0
Balance at the end (in shares) at Sep. 30, 2023		88,206,048

CONDENSED CONSOLIDATED STATEM_3

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (unaudited) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022
Cash flows from operating activities
Net (loss) income	$ (1,335)	$ 21,212
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for credit losses	10	240
Amortization expense	6,473	5,872
Depreciation expense	146	143
Amortization of debt issuance costs	42	42
Gain on change in fair value of Seller's Earn-Out	(750)	(15,664)
Gain on change in fair value of warrants	(1,436)	(8,261)
Gain on deconsolidation of SymetryML	0	(1,939)
Loss on change in fair value of SAFE Notes	0	788
Loss on fair value of investment in SymetryML Holdings	153	49
Deferred tax benefit	(5,105)	(5,455)
Equity-based compensation	5,924	8,627
Seller's Earn-Out equity-based compensation	0	1,364
Changes in operating assets and liabilities:
Accounts receivable	7,324	13,103
Income taxes recoverable	(32)	(4)
Prepaid expenses and other assets	(453)	337
Accounts payable	775	(3,911)
Accrued compensation, accrued expenses, and other liabilities	(5,918)	(8,104)
Net cash provided by operating activities	5,818	8,439
Cash flows from investing activities
Capitalized software development costs	(3,969)	(2,008)
Purchase of property and equipment	(88)	(311)
Decrease in cash from deconsolidation of SymetryML	0	(69)
Net cash used in investing activities	(4,057)	(2,388)
Cash flows from financing activities
Cash received for exercised options	150	346
Payment of revolver borrowings	0	(39,017)
Proceeds from SAFE Notes	0	200
Proceeds from SymetryML preferred stock issuance	0	400
Taxes paid related to net settlement of restricted stock awards	(466)	(231)
Proceeds from employee stock purchase plan	315	0
Net cash used in financing activities	(1)	(38,302)
Net increase (decrease) in cash and cash equivalents	1,760	(32,251)
Cash and cash equivalents at beginning of period	72,579	100,093
Cash and cash equivalents at end of period	74,339	67,842
Supplemental disclosure of cash flow information
Increase in lease liabilities from obtaining right-of-use assets - ASC 842 adoption	0	8,376
Increase in lease liabilities from obtaining right-of-use assets	0	214
Non-cash investing and financial activities
Capitalized software and property and equipment, net included in accounts payable	40	56
Stock based compensation included in capitalized software development costs	$ 257	$ 0

Description of Business

Description of Business	9 Months Ended
	Sep. 30, 2023
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Description of Business	1. DESCRIPTION OF BUSINESS AdTheorent Holding Company Inc. and its subsidiaries (the “Company”, “AdTheorent”), is a digital media platform which focuses on performance-first, privacy-forward methods to execute programmatic digital advertising campaigns, serving both advertising agency and brand customers. The Company uses machine learning and advanced data science to organize, analyze and operationalize non-sensitive data to deliver real-world value for customers. Central to its ad-targeting and campaign optimization methods, the Company builds custom machine learning models for each campaign using historic and real-time data to predict future consumer conversion actions for every digital ad impression. The Company’s machine learning models are customized for every campaign and the platform “learns” over the course of each campaign as it processes more data related to post media view conversion experience. AdTheorent is a Delaware corporation headquartered in New York, New York.

Summary of Significant Accounti

Summary of Significant Accounting Policies	9 Months Ended
	Sep. 30, 2023
Accounting Policies [Abstract]
Summary of Significant Accounting Policies	2. SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES Basis of Presentation and Principles of Consolidation The accompanying Condensed Consolidated Financial Statements are prepared in accordance with accounting principles generally accepted in the United States of America (“GAAP”) and include the operations of the Company. All intercompany transactions have been eliminated in consolidation. In the opinion of management, the accompanying unaudited Condensed Consolidated Financial Statements contain all adjustments, consisting of only normal recurring adjustments, necessary for a fair statement of the Company's financial position as of September 30, 2023 and for the three and nine months ended September 30, 2023 and 2022. The Condensed Consolidated Balance Sheet as of December 31, 2022, has been derived from the Company's audited consolidated financial statements as of that date. The Condensed Consolidated Financial Statements should be read in conjunction with the Consolidated Financial Statements and notes thereto included in the Company's Annual Report on Form 10-K for the year ended December 31, 2022 , which include a complete set of footnote disclosures, including the Company's significant accounting policies. The results for interim periods are not necessarily indicative of the results that may be expected for a full fiscal year or for any other future period. Summary of Significant Accounting Policies There have been no material changes in the Company's significant accounting policies during the nine months ended September 30, 2023, as compared to the significant accounting policies described in Note 2 to the Consolidated Financial Statements for the year ended December 31, 2022 , except as detailed below. Accounts Receivable and Allowance for Credit Losses (formerly Allowance for Doubtful Accounts) Accounts receivable are recorded at the invoiced amount, are unsecured, and do not bear interest. The allowance for credit losses is based on the best estimate of the amount of probable credit losses in existing accounts receivable. The Company reviews the allowance for credit losses on a quarterly basis. The allowance for credit losses is determined based on historical collection experience, the review in each period of the status of the then outstanding accounts receivable , while taking into consideration current customer information, and other macroeconomic and industry factors. Account balances are written off against the allowance when the Company believes it is probable the receivable will not be recovered. Emerging Growth Company From time to time, new accounting pronouncements, or Accounting Standard Updates (“ASU”) are issued by the Financial Accounting Standards Board (“FASB”), or other standard setting bodies and adopted by the Company as of the specified effective date. Unless otherwise discussed, the impact of recently issued standards that are not yet effective will not have a material impact on the Company’s financial position or results of operations upon adoption. The Company is an emerging growth company (“EGC”) as defined in the Jumpstart Our Business Startups Act of 2012 (“JOBS Act”) and may take advantage of reduced reporting requirements that are otherwise applicable to public companies. Section 107 of the JOBS Act exempts emerging growth companies from being required to comply with new or revised financial accounting standards until private companies are required to comply with those standards. This means that when a standard is issued or revised and it has different application dates for public and nonpublic companies, the Company has the option to adopt the new or revised standard at the time nonpublic companies adopt the new or revised standard and can do so until such time that the Company either (i) irrevocably elects to “opt out” of such extended transition period or (ii) no longer qualifies as an emerging growth company. The Company has elected to use the extended transition period for complying with new or revised accounting standards unless the Company otherwise early adopts select standards. Recent Accounting Pronouncements Recently Adopted Accounting Pronouncements ASU No. 2019-12, Income Taxes – Simplifying the Accounting for Income Taxes (Topic 740) In December 2019, the FASB issued ASU No. 2019-12, Income Taxes (Topic 740) (“ASU 2019-12”), which is part of the FASB’s overall simplification initiative to reduce the costs and complexity of applying accounting standards while maintaining or improving the usefulness of the information provided to users of financial statements. ASU 2019-12 simplifies accounting guidance for intra-period allocations, deferred tax liabilities, year-to-date losses in interim periods, franchise taxes, step-up in tax basis of goodwill, separate entity financial statements, and interim recognition of tax laws or rate changes. ASU 2019-12 is effective for emerging growth companies following private company adoption dates in fiscal years beginning after December 15, 2021, and interim periods within fiscal years beginning after December 15, 2022 , with early adoption permitted. The Company has determined the adoption did not have a material impact on the Condensed Consolidated Financial Statements. ASU No. 2016-13, Financial Instruments - Credit Losses (Topic 326) In June 2016, the FASB issued ASU No. 2016-13, Financial Instruments — Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments (“ASU 2016-13”), which requires entities to estimate all expected credit losses for certain types of financial instruments, including trade receivables, held at the reporting date based on historical experience, current conditions, and reasonable and supportable forecasts. The updated guidance also expands the disclosure requirements to enable users of financial statements to understand the entity’s assumptions, models and methods for estimating expected credit losses over the entire contractual term of the instrument from the date of initial recognition of that instrument. ASU 2016-13, as subsequently amended for various technical issues, is effective for emerging growth companies following private company adoption dates for fiscal years, and for interim periods within those fiscal years, beginning after December 15, 2022, with early adoption permitted. The Company adopted this ASU effective January 1, 2023 . The adoption of this ASU did not have a material impact on the Company’s Condensed Consolidated Financial Statements.

Revenue Recognition

Revenue Recognition	9 Months Ended
	Sep. 30, 2023
Revenue from Contract with Customer [Abstract]
Revenue Recognition	3. REVENUE RECOGNITION ASC 606, Revenue from Contracts with Customers Under ASC 606, revenue is recognized when a customer obtains control of promised goods or services in an amount that reflects the consideration the Company expects to receive in exchange for those goods or services. The Company measures revenue based on the consideration specified in the customer arrangement, and revenue is recognized when the performance obligations in the customer arrangement are satisfied. The transaction price of a contract is allocated to each distinct performance obligation and recognized as revenue when or as the customer receives the benefit of the performance obligation. The Company’s revenue streams include Managed Programmatic revenue and Direct Access revenue. The Direct Access offerings are new to the market and not yet material to the Company from a financial reporting perspective. For its Managed Programmatic revenue, the Company negotiates insertion orders (“IOs”) with the advertising agency or brand, which specifies the material terms of the campaign. IOs are subject to cancellation by the client, usually with no penalty, for the unfilled portion of the IO. The Company’s performance obligation is to deliver digital advertisements in accordance with the terms of the IO. The Company has concluded that this constitutes a single performance obligation for financial reporting purposes and that such obligation is recognized over the time, using the output method, for which the Company is transferring value to the customer through delivered advertising units. The Company is responsible for fulfilling advertising delivery, including optimization and reporting, establishes the selling price for the delivery, and the Company performs billing and collections, including ultimately retaining credit risk. The Company has therefore determined that it serves as a principal and that gross presentation of revenue is appropriate. Direct Access customers access the Company’s platform directly and manage all aspects of their advertising campaigns. The Company provides advertiser and marketer customers direct access to the platform so that they can execute and manage advertising campaigns and is not primarily responsible for the purchase of advertising inventory, third party data, and other related expenses. Revenue for customers working with the Company on this basis are recorded net of the amount incurred and payable to suppliers for the cost of advertising inventory, third party data and other add-on features, as the Company does not control the purchase nor have pricing discretion with regard to these items. The Company bills clients for their purchases through its platform and the associated platform fees. For the Company’s Direct Access Plus offering, which is used as a higher-touch on-boarding level of service for Direct Access customers who desire greater implementation support, the Company is primarily responsible for the purchase of advertising inventory, third party data, and other related expenses. The Company has therefore determined that the Company serves as a principal and that gross presentation of revenue is appropriate. The Company has elected to expense the costs to obtain or fulfill a contract as incurred because the amortization period of the asset that the Company otherwise would have recognized is one year or less. Therefore, there were no contract cost assets recognized as of September 30, 2023 or December 31, 2022. The Company has elected not to disclose the aggregate amount of the transaction price allocated to performance obligations that are unsatisfied (or partially unsatisfied) as of the end of the reporting period for performance obligations with a remaining performance obligation that is part of a contract that has an original expected duration of one year or less. Contract assets and contract liabilities related to the Company’s revenue streams were not significant to the accompanying Condensed Consolidated Financial Statements.

Accounts Receivable, Net

Accounts Receivable, Net	9 Months Ended
	Sep. 30, 2023
Receivables [Abstract]
Accounts Receivable, Net	4. ACCOUNTS RECEIVABLE, Net Accounts receivable, net consisted of the following: September 30, December 31, 2023 2022 Accounts receivable $ 49,309 $ 56,243 Other receivables 40 483 $ 49,349 $ 56,726 Less: allowance for credit losses ( 656 ) ( 699 ) Accounts receivable, net $ 48,693 $ 56,027 The provision for credit losses on accounts receivable was $ 10 and $ 68 for the three months ended September 30, 2023 and 2022, respectively, and $ 10 and $ 240 for the nine months ended September 30, 2023 and 2022, respectively. The following table presents changes in the allowance for credit losses: Three Months Ended September 30, Nine Months Ended September 30, 2023 2022 2023 2022 Beginning balance $ 663 $ 537 $ 699 $ 365 Reserve for credit losses 10 68 10 246 Write-offs, net of recoveries ( 17 ) — ( 53 ) ( 6 ) Ending balance $ 656 $ 605 $ 656 $ 605

Prepaid Expenses

Prepaid Expenses	9 Months Ended
	Sep. 30, 2023
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]
Prepaid Expenses	5. PREPAID EXPENSES Prepaid expenses consisted of the following: September 30, December 31, 2023 2022 Platform operations $ 1,344 $ 876 Software 576 501 Insurance 499 — Other 254 89 Total $ 2,673 $ 1,466

Property and Equipment, Net

Property and Equipment, Net	9 Months Ended
	Sep. 30, 2023
Property, Plant and Equipment [Abstract]
Property and Equipment, Net	6. PROPERTY AND EQUIPMENT, Net Property and equipment, net consisted of the following: September 30, December 31, 2023 2022 Computers and equipment $ 908 $ 949 Less: accumulated depreciation ( 443 ) ( 429 ) Total $ 465 $ 520 Depreciation expense on Property and equipment was $ 48 and $ 51 for the three months ended September 30, 2023 and 2022, respectively, and $ 146 and $ 143 for the nine months ended September 30, 2023 and 2022 , respectively.

Intangible Assets, Net

Intangible Assets, Net	9 Months Ended
	Sep. 30, 2023
Goodwill and Intangible Assets Disclosure [Abstract]
Intangible Assets, Net	7. INTANGIBLE ASSETS, Net Intangible assets, net consisted of the following: September 30, 2023 Remaining Weighted Average Useful Life (in years) Gross amount Accumulated amortization Net carrying amount Software — $ 6,038 $ ( 6,038 ) $ — Capitalized software costs 1.3 14,435 ( 9,890 ) 4,545 Customer relationships 0.3 31,492 ( 30,373 ) 1,119 Trademarks/tradename 3.3 10,195 ( 6,886 ) 3,309 Total $ 62,160 $ ( 53,187 ) $ 8,973 December 31, 2022 Remaining Weighted Average Useful Life (in years) Gross amount Accumulated amortization Net carrying amount Software — $ 6,038 $ ( 6,038 ) $ — Capitalized software costs 1.1 10,173 ( 7,535 ) 2,638 Customer relationships 1.0 31,492 ( 27,017 ) 4,475 Trademarks/tradename 4.0 10,195 ( 6,125 ) 4,070 Total $ 57,898 $ ( 46,715 ) $ 11,183 Amortization expense was included in the Company’s Condensed Consolidated Statements of Operations as follows: Three Months Ended September 30, Nine Months Ended September 30, 2023 2022 2023 2022 Platform operations $ 798 $ 549 $ 2,173 $ 1,615 Sales and marketing 1,371 1,370 4,111 4,110 Technology and development 98 — 181 140 General and administrative 2 3 8 7 Total $ 2,269 $ 1,922 $ 6,473 $ 5,872 Total amortization expense for the three months ended September 30, 2023 and 2022 was $ 2,269 and $ 1,922 , respectively, and $ 6,473 and $ 5,872 for the nine months ended September 30, 2023 and 2022, respectively. Amortization expense for capitalized software costs for the three months ended September 30, 2023 and 2022 was $ 896 and $ 549 , respectively, and $ 2,354 and $ 1,614 for the nine months ended September 30, 2023 and 2022, respectively. Estimated future amortization of intangible assets as of September 30, 2023 is as follows: Remainder of 2023 $ 2,285 2024 3,881 2025 1,782 2026 1,016 2027 7 Thereafter 2 Total $ 8,973

Goodwill

Goodwill	9 Months Ended
	Sep. 30, 2023
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill	8. GOODWILL The Company is a single reporting unit. The goodwill balance as of September 30, 2023 and December 31, 2022 was $ 34,842 . The Company did no t identify a goodwill impairment indicator during the nine months ended September 30, 2023 to necessitate the performance of an interim impairment test. The Company will continue to monitor impairment indicators in future periods, inclusive of its stock price.

Accrued Expenses

Accrued Expenses	9 Months Ended
	Sep. 30, 2023
Payables and Accruals [Abstract]
Accrued Expenses	9. ACCRUED EXPENSES Accrued expenses consisted of the following: September 30, 2023 December 31, 2022 Campaign costs $ 2,128 $ 4,081 Income taxes 1,852 120 Deferred revenues 430 1,149 Platform operations 373 401 Other 293 473 Total $ 5,076 $ 6,224

Debt

Debt	9 Months Ended
	Sep. 30, 2023
Debt Disclosure [Abstract]
Debt	10. DEBT On December 22, 2021, the Company entered into a senior secured credit facilities credit agreement (the “Senior Secured Agreement”) with Silicon Valley Bank (“SVB”). The Senior Secured Agreement allows for the Company to borrow up to $ 40,000 in a revolving credit facility (“Revolving Credit Facility”), including a $ 10,000 sub-limit for letters of credit and a swing line sub-limit of $ 10,000 . The Revolving Credit Facility commitment termination date is December 22, 2026 . On March 10, 2023, SVB was seized by regulators and placed under the receivership of the Federal Deposit Insurance Corporation (“FDIC”). Two days after the failure, the FDIC announced jointly with other agencies that all depositors would have full access to their funds the next morning. The FDIC reopened SVB on March 13, 2023 as a newly organized bridge bank, Silicon Valley Bridge Bank, N.A (“SVBB”) and on March 27, 2023, First Citizens Bank acquired SVBB. The Company’s Senior Secured Agreement remains available to the Company with no amendments to the original agreement with SVB, which is now a division of First Citizens Bank. The Company is subject to customary representations, warranties, and covenants. The Senior Secured Agreement requires that the Company meet certain financial and non-financial covenants which include, but are not limited to, (i) delivering audited consolidated financial statements to the lender within 90 days after year-end commencing with the fiscal year ending December 31, 2022 financial statements, (ii) delivering unaudited quarterly consolidated financial statements within 45 days after each fiscal quarter, commencing with the quarterly period ending on March 31, 2022 and (iii) maintaining certain leverage ratios and liquidity coverage ratios. As of September 30, 2023 and December 31, 2022, the Company was in full compliance with the terms of the Senior Secured Agreement. As of both September 30, 2023 and December 31, 2022 , the Company had one letter of credit for $ 983 . As of September 30, 2023 and December 31, 2022 , there were no amounts drawn on the Revolving Credit Facility.

Income Taxes

Income Taxes	9 Months Ended
	Sep. 30, 2023
Income Tax Disclosure [Abstract]
Income Taxes	11. INCOME TAXES For the three months ended September 30, 2023 and 2022, the Company recorded an income tax provision of $ 6,254 and $ 1,095 , respectively, and for the nine months ended September 30, 2023 and 2022, the Company recorded an income tax (provision) benefit of ($ 938 ) and $ 540 , respectively. The annual effective income tax rates before discrete items (“AETR”) for the nine months ended September 30, 2023 and 2022 was 36.1 % and 15.0 %, respectively. The AETR for the nine months ended September 30, 2023 was more than the statutory rate of 21 % primarily due to state and local income taxes, meals and entertainment, and executive equity-based compensation not deductible for tax purposes. The Company did not include any fair value adjustments not reasonably estimable for the full-year in the calculation of its AETR as the full-year impact of these specific items cannot be reasonably projected. Refer to Note 14 – Seller's Earn-out and Note 15 – Warrants for further detail on fair value adjustments for the Seller's Earn-Out and warrant liabilities, respectively.

Equity-Based Compensation

Equity-Based Compensation	9 Months Ended
	Sep. 30, 2023
Share-Based Payment Arrangement [Abstract]
Equity-Based Compensation	12. EQUITY-BASED COMPENSATION 2021 Long-Term Incentive Plan The Board approved 2021 Long-Term Incentive Plan (the “2021 Plan”) was adopted by the Company’s stockholders on December 21, 2021, initially authorizing the Company to issue 10,131,638 shares of Common Stock. Annually, on each January 1 and through January 1, 2031, the 2021 Plan authorizes the Company to increase the shares available for issuance by an amount equal to the lesser of (a) 5 % of the total number of shares outstanding on the last day of the preceding calendar year or (b) such smaller number of shares as determined by the Company’s Board of Directors. On January 1, 2023, the Company added 4,348,415 shares to the shares available for issuance under the 2021 Plan. As of September 30, 2 023, 6,627,316 shares remained available for issuance pursuant to the 2021 Plan. Stock Option Award Activity For the three months ended September 30, 2023 and 2022, $ 0 a nd $ 62 , respectively, of equity-based compensation expense was recognized related to equity options granted, and for the nine months ended September 30, 2023 and 2022, $ 3 a nd $ 187 , respectively, of the equity-based compensation expense was recognized related to equity options granted. All equity options were fully vested as of July 1, 2023. The following table summarizes stock option activity for the nine months ended September 30, 2023: Stock Options Weighted-Average Exercise Price Outstanding as of December 31, 2022 6,915,715 $ 0.61 Exercised ( 233,467 ) 0.64 Forfeited ( 18,563 ) 0.74 Outstanding as of September 30, 2023 6,663,685 $ 0.60 Exercisable as of September 30, 2023 6,663,685 $ 0.60 Restricted Stock Units The fair value of Restricted Stock Units (“RSUs”) equals the market value of the Company’s common stock on the date of the grant. The RSUs are excluded from issued and outstanding shares until they are vested. On May 24, 2023, th e Company granted 5,564,806 RSUs at a fair value of $ 1.51 per s hare to employees and Board members, which consisted of a mix of both time-based and performance-based vesting conditions (“PSUs”). The vesting conditions for the PSUs are based on achievement of revenue targets. Equity-based compensation expense was not recognized on the PSUs for the three and nine months ended September 30, 2023 and 2022, on the basis that achievement of the specified performance targets was not considered probable to be met in the periods. All PSUs granted in the year ended December 31, 2022 were cancelled as of December 31, 2022 due to not obtaining the defined targets of the related grants. For the three months ended September 30, 2023 and 2022 , $ 2,558 , and $ 2,694 of equity-based compensation expense was recognized, and for the nine months ended September 30, 2023 and 2022 , $ 5,823 and $ 8,413 of equity-based compensation expense was recognized, related to RSUs with time-based vesting conditions . The following summarizes RSU activity for the nine months ended September 30, 2023: Restricted Stock Units Weighted-Average Grant Date Fair Value Outstanding as of December 31, 2022 2,764,681 $ 9.23 Granted 5,564,806 1.51 Vested ( 1,055,472 ) 9.01 Forfeited ( 169,943 ) 7.83 Outstanding as of September 30, 2023 7,104,072 $ 3.25 Employee Stock Purchase Plan On December 21, 2021, the Company’s stockholders approved the AdTheorent Holding Company, Inc. Employee Stock Purchase Plan (the “ESPP”) and the ESPP became effective on such date with an authorized 2,026,328 shares of common stock (subject to certain adjustments to reflect changes in the Company’s capitalization) are reserved and may be purchased by eligible employees who become participants in the ESPP. The purchase price per share of the common stock is the lesser of 85 % of the fair market value of a share of common stock on the offering date or 85 % of the fair market value of a share of common stock on the purchase date. The first offering period under the ESPP began August 15, 2022 and ended January 14, 2023. Beginning with the second offering period beginning January 14, 2023, each offering period will be six months. Pursuant to the ESPP, on January 1, 2023, the Company added 869,863 shares available for issuance. As of September 30, 2023, there were 2,552,353 shares of common stock available for issuance pursuant to the ESPP. Total compensation expense related to the ESPP was $ 26 and $ 27 for the three months ended September 30, 2023 and 2022, respectively, and $ 98 and $ 27 for the nine months ended September 30, 2023 and 2022, respectively, classified within each applicable operating expense category on the accompanying Consolidated Statements of Operations and in the equity-based compensation table below. The fair value of the purchase rights granted under the ESPP for the offering period beginning July 15, 2023 was $ 0.51 . It was estimated by applying the Black-Scholes Option-Pricing model (“BSM”) to the purchase period in the offering period using the following assumptions: July 15, 2023 Grant price $ 1.50 Expected term 6 months Expected volatility 65.19 % Risk-free interest rate 5.52 % Expected dividend yield 0.00 % Grant price - Closing stock price on the first day of the offering period Expected Term - The expected term is based on the end date of the purchase period of each offering period, which is three months from the commencement of each new offering period. Expected volatility - The expected volatility is based on historical volatility of the Company’s stock as well as the implied volatility from publicly traded options on the Company’s stock. Risk-free interest rate - The risk-free interest rate is based on a United States (“U.S.”) Treasury rate in effect on the date of grant with a term equal to the expected term. Equity-Based Compensation Expense The following table summarizes the total equity-based compensation expense included in the Condensed Consolidated Statements of Operations: Three Months Ended September 30, Nine Months Ended September 30, 2023 2022 2023 2022 Platform operations $ 412 $ 485 $ 919 $ 1,365 Sales and marketing 1,031 920 2,373 2,773 Technology and development 251 424 640 1,448 General and administrative 890 954 1,992 3,041 Total equity-based compensation expense $ 2,584 $ 2,783 $ 5,924 $ 8,627 Equity-based compensation included in capitalized softwa re development costs was $ 113 and $ 0 for the three months ended September 30, 2023 and 2022 , respectively and $ 257 and $ 0 for the nine months ended September 30, 2023 and 2022, respectively. As of September 30, 2023, all stock options were vested and the related compensation cost was fully recognized. As of September 30, 2023, there was $ 15,797 of total unrecognized compensation expense related to the RSUs, which is expected to be recognized over a weighted average period of 1.6 years.

Equity

Equity	9 Months Ended
	Sep. 30, 2023
Equity [Abstract]
Equity	13. EQUITY The Company has authorized a total of 370,000,000 shares for issuance with 350,000,000 shares designated as common stock and 20,000,000 shares designated as preferred stock. The Company’s common stockholders are entitled to one vote per share for the election of the Company directors and all other matters submitted to a vote of stockholders of the company. Additionally, the Company’s common stockholders will be entitled to receive dividends when, as and if declared by the Company Board, payable either in cash, in property or in shares of capital stock, after payment to any Company preferred stockholders having preference, if any. Out of the total authorized commo n stock, 88,206,048 , and 86,968,309 were issued and outstanding as of September 30, 2023 and December 31, 2022, respectively. The Company’s Board is authorized to issue shares of preferred stock, without stockholder approval, with such designations, voting and other rights and preferences as they may determine. As of September 30, 2023 and December 31, 2022 , there were no shares of preferred stock issued and outstanding.

Seller's Earn-Out

Seller's Earn-Out	9 Months Ended
	Sep. 30, 2023
Business Combination, Description [Abstract]
Seller's Earn-Out	14. SELLER'S EARN-OUT The estimated fair value of the Seller’s Earn-Out, as defined in Note 15 – Seller’s Earn-Out included in the Company's Annual Report on Form 10-K for the year ended December 31, 2022 , was determined using a Monte Carlo simulation valuation model using the most reliable information available. Assumptions used in the valuation were as follows: September 30, 2023 December 31, 2022 Stock price $ 1.29 $ 1.66 Dividend yield 0.00 % 0.00 % Volatility 70.00 % 75.00 % Risk-free rate 4.80 % 4.37 % Forecast period (in years) 1.23 1.98 Dividend yield - The expected dividend assumption is based on the Company’s history and expectation of dividend payouts. The Company has not paid and does not intend to pay dividends. Expected Volatility - The expected volatility assumption was determined by examining the Company’s historical volatility, the historical volatilities of a group of industry peers, and the implied volatility from the market price of the Public Warrants. Risk-free rate - The risk-free rate assumption is based on the U.S. Treasury instruments, the terms of which were consistent with the expected term of the Seller’s Earn-Out. Forecast period – The forecast period represents the time until expiration of the Seller’s Earn-Out. Seller’s Earn-Out to equity holders and vested Exchanged Options as of Close: The Seller’s Earn-Out is recorded on the Condensed Consolidated Balance Sheet as a non-current liability since the expected date of achievement based on the valuation model is over twelve months as of September 30, 2023 . The following table presents activity for the Seller's Earn-Out measured using the Monte Carlo model, described above, as of September 30, 2023 and December 31, 2022: Seller's Earn-Out Balance at December 31, 2022 $ 773 Change in fair value ( 750 ) Balance at September 30, 2023 $ 23 Seller’s Earn-Out to Exchanged Option and Exchanged Unit holders as of Close: Equity-based compensation related to the Seller’s Earn-Out to Exchanged Option and Exchanged Unit holders was $ 0 and $ 373 for the three months ended September 30, 2023 and 2022 , respectively, and $ 0 and $ 1,364 for the nine months ended September 30, 2023 and 2022, respectively. The compensation expense was fully recognized in the third quarter of 2022. Equity-based compensation expense related to the Seller’s Earn-Out to Exchanged Option an d Exchanged Unit holders was included in the Company’s Condensed Consolidated Statements of Operations for the three and nine months ended September 30, 2022 as follows: Three Months Ended Nine Months Ended September 30, 2022 September 30, 2022 Platform operations $ 44 $ 161 Sales and marketing 110 405 Technology and development 37 131 General and administrative 182 667 Total $ 373 $ 1,364

Warrants

Warrants	9 Months Ended
	Sep. 30, 2023
Warrants and Rights Note Disclosure [Abstract]
Warrants	15. WARRANTS The following table summarizes the number of outstanding Public Warrants and Private Placement Warrants and the corresponding exercise price: September 30, 2023 December 31, 2022 Exercise Price Expiration Date Public Warrants 10,541,657 10,541,657 $ 11.50 December 21, 2026 Private Placement Warrants 5,432,237 5,432,237 $ 11.50 December 21, 2026 Of the 5,432,237 Private Placement Warrants, 551,096 warrants are held in escrow subject to earn-out targets (“Escrow Warrants”). The Escrow Warrants will be released if the volume-weighted average price of the Company’s common stock equals or exce eds $ 14.00 pe r share for any 20 trading days within any consecutive 30 trading day period on or before December 21, 2024. Measurement of Public Warrants The Public Warrants are measured at fair value on a recurring basis. The measurement of the Public Warrants as of September 30, 2023 is classified as Level 1 due to the use of an observable market quote in an active market under the ticker ADTHW. Measurement of Private Placement Warrants The Private Placement Warrants are measured at fair value on a recurring basis. As of September 30, 2023, a BSM was used to determine fair value and as of December 31, 2022, a Monte Carlo simulation model is used to determine fair value. The measurement of the Private Placement Warrants is classified as Level 2. The key inputs into the BSM and Monte Carlo simulation model as of September 30, 2023 and December 31, 2022, respectively, for the Private Placement Warrants were as follows: September 30, December 31, 2023 2022 Risk-free interest rate 4.78 % 4.07 % Dividend yield 0.00 % 0.00 % Expected term (years) 3.23 3.98 Expected Volatility 70.00 % 69.50 % Exercise Price $ 11.50 $ 11.50 Stock Price $ 1.29 $ 1.66 The volatility utilized in estimating the fair value of the Company’s Private Placement Warrant liability as of September 30, 2023, was based on a weighted average of the implied volatility, the guideline public company volatility, and the Company’s historical volatility. The implied volatility was calculated from the public warrants and using the Monte Carlo simulation approach. The guideline public company volatility was estimated based on historical lookback volatility of guideline public companies over a term commensurate with the expected term of the warrant, as well as consideration to implied volatilities sourced from Bloomberg, L.P. The Company’s historical volatility was estimated based on the historical lookback of AdTheorent’s volatility over the time since the Company was publicly traded. The volatility utilized in estimating the fair value of the Company’s Private Placement Warrant liability as of December 31, 2022, was based on a weighted average of the implied volatility and guideline public company volatility. The implied volatility was estimated by calibrating to the market price of the public warrants as of December 31, 2022, using a binomial lattice model. The guideline public company volatility was estimated based on historical lookback volatility of guideline public companies over a term commensurate with the expected term of the warrant, as well as consideration to implied volatilities sourced from Bloomberg, L.P. Key assumptions are as follows: Risk-free interest rate - The risk-free rate assumption is based on the U.S. Treasury instruments, the terms of which were consistent with the expected term of the Private Placement Warrants. Dividend yield - The expected dividend assumption is based on the Company’s history and expectation of dividend payouts. The Company has not paid and does not intend to pay dividends. Expected term – The forecast period represents the time until expiration of the Private Placement Warrants. Expected Volatility - The expected volatility assumption was determined by examining the Company’s historical volatility, the historical volatilities of a group of industry peers, and the implied volatility from the market price of the Public Warrants. Warrant liability On September 30, 2023, the fair values of the Public Warrants and Private Placement Warrants outstanding were determined to be $ 0.04 and $ 0.08 per warrant, respectively. On December 31, 2022, the Public Warrants and Private Placement Warrants outstand ing were determined to be $ 0.10 and $ 0.23 per warrant, respectively. The following table presents the changes in the fair value of the Public and Private Placement Warrants: Public Warrants Private Placement Warrants Total Warrant Liabilities Fair value as of December 31, 2022 $ 1,054 $ 1,244 $ 2,298 Change in valuation inputs or other assumptions ( 632 ) ( 804 ) ( 1,436 ) Fair value as of September 30, 2023 $ 422 $ 440 $ 862

Symetryml and Symetryml Holding

Symetryml and Symetryml Holdings	9 Months Ended
	Sep. 30, 2023
Equity [Abstract]
Symetryml and Symetryml Holdings	16. SYMETRYML AND SYMETRYML HOLDINGS SymetryML Holdings, LLC (“SymetryML Holdings”) was a subsidiary of Legacy AdTheorent after a contribution of Legacy AdTheorent’s SymetryML department in exchange for membership interest. Class B interests in SymetryML Holdings that vest over time, comprising 50 % of the total equity interests of SymetryML Holdings, were offered to certain employees (a non-controlling interest) of SymetryML. Legacy AdTheorent retained the remaining 50 % total equity interests, through the holding of all Class A equity interests in SymetryML Holdings. SymetryML Holdings and SymetryML was ultimately deconsolidated as of March 31, 2022 through a series seed preferred financing transaction (“D econsolidation”), resulting in a gain of $ 1,939 , of which $ 541 related to the remeasurement of the retained noncontrolling investment to fair value. The gain of $ 1,939 was recorded within Other Income on the Company’s Condensed Consolidated Statements of Operations for the nine months ended September 30, 2022. The following table shows the amounts related to the accounting for the Deconsolidation: For the Nine Months Ended September 30, 2022 Fair value of consideration received $ — Fair value of retained noncontrolling interest 861 Carrying amount of deconsolidated noncontrolling interest 2,372 Less: Carrying amount of deconsolidated net assets ( 1,294 ) Gain on Deconsolidation $ 1,939 The Deconsolidation resulted in the removal of the noncontrolling interest presentation and therefore there is no noncontrolling interest as of September 30, 2023 or December 31, 2022. VIE Determination Based on the Company’s assessment, after the Deconsolidation, SymetryML is considered a variable interest entity (“VIE”) because it does not have sufficient equity at risk to finance its activities without additional subordinated financial support. SymetryML Holdings is not the primary beneficiary as it no longer has the power to direct the activities that most significantly impact SymetryML’s economic performance. Based on the Company’s assessment, SymetryML Holdings, after the Deconsolidation, is considered a VIE because the holders of the equity investment at risk, as a group, lack the power to direct the activities of SymetryML Holdings that most significantly impact its economic performance. This is due to the conclusion that Class B equity interests do not meet the definition of equity at risk because the Class B interests were issued by Legacy AdTheorent to SymetryML management as founders’ equity to compensate for past and future services to SymetryML. The Company further concluded that the Company is not the primary beneficiary as it no longer has the power to direct the activities that most significantly impact SymetryML economic performance. As a result of the Deconsolidation of SymetryML and SymetryML Holdings, the Company has retained a noncontrolling investment in SymetryML Holdings that provides the Company the ability to exercise significant influence over both VIEs. The entities continue to be considered related parties of the Company following the Deconsolidation. Retained Fair Value Option Investments in SymetryML and SymetryML Holdings For its retained noncontrolling investment in SymetryML Holdings, the Company has made an irrevocable election to account for its investment at fair value with changes in fair value reported in earnings. The Company elected to apply fair value accounting to the retained investment in SymetryML Holdings because the Company believes that fair value is the most relevant measurement attribute for these investments, as well as to reduce operational and accounting complexity. The Company’s election to apply fair value accounting to these investments may cause fluctuations in the Company’s earnings from period to period. The fair value of the Company’s retained investment was $ 636 and $ 789 a s of September 30, 2023 and December 31, 2022, respectively. The fair value measurements involve significant unobservable inputs, which include total equity value of SymetryML, volatility, risk-free rate, equity holder required rate of return, and discount for lack of marketability (“DLOM”). The total equity value of SymetryML was calculated using the Backsolve Method under the Market Approach. The volatility was based on guideline public companies and adjusted for differences in size and leverage. The risk-free rate was based on U.S. Treasury securities with a term commensurate with the time to exit. The equity holder required rate of return was based on private equity and venture capital rate of return studies. The DLOM was estimated based on put option models and series volatility. The Company’s maximum exposure to loss as a result of its involvement with these VIEs is limited to the carrying amount of its investment which is recorded at fair value each reporting period as described above. There are not any explicit or implicit contracts, guarantees, or commitments that would require the Company to provide financial support to the investees or any other arrangements that could expose the Company to losses beyond the fair value of its current investment.

Fair Value Measurements

Fair Value Measurements	9 Months Ended
	Sep. 30, 2023
Fair Value Disclosures [Abstract]
Fair Value Measurements	17. FAIR VALUE MEASUREMENTS The following tables summarize the Company's assets and liabilities measured at fair value on a recurring basis by level within the fair value hierarchy: September 30, 2023 Level 1 Level 2 Level 3 Total Assets: Investment in SymetryML Holdings(2) $ — $ — $ 636 $ 636 Total assets $ — $ — $ 636 $ 636 Liabilities: Public warrants(1) $ 422 $ — $ — $ 422 Private placement warrants(1) — 440 — 440 Seller's Earn-Out(1) — — 23 23 Total liabilities $ 422 $ 440 $ 23 $ 885 December 31, 2022 Level 1 Level 2 Level 3 Total Assets: Investment in SymetryML Holdings(2) $ — $ — $ 789 $ 789 Total assets $ — $ — $ 789 $ 789 Liabilities: Public warrants(1) $ 1,054 $ — $ — $ 1,054 Private placement warrants(1) — 1,244 — 1,244 Seller's Earn-Out(1) — — 773 773 Total liabilities $ 1,054 $ 1,244 $ 773 $ 3,071 (1) Refe r to Note 15 — Seller's Earn-Out and Note 16 — Warrants included in the Company's Annual Report on Form 10-K for the year ended December 31, 2022, for further i nformation about the initial and subsequent measurement, including significant assumptions and valuation methodologies of these instruments. (2) Refe r to Note 16 — SymetryML and SymetryML Holdings belo w for further information about the initial measurement, including significant assumptions and valuation methodologies of this investment. The following tables present a rollforward of the Company's assets and liabilities classified as Level 3 for nine months ended September 30, 2023 and 2022. Nine Months Ended Investment in SymetryML Holdings Seller's Earn-Out Liability Balance as December 31, 2022 $ 789 $ 773 Measurement adjustments ( 153 ) ( 750 ) Balance as of September 30, 2023 $ 636 $ 23 Nine Months Ended Investment in SymetryML Holdings Seller's Earn-Out Liability Balance as December 31, 2021 $ — $ 18,081 Additions 861 — Measurement adjustments ( 49 ) ( 15,664 ) Balance as of September 30, 2022 $ 812 $ 2,417

(Loss) Earnings Per Share

(Loss) Earnings Per Share	9 Months Ended
	Sep. 30, 2023
Earnings Per Share [Abstract]
(LOSS) EARNINGS PER SHARE	18. (LOSS) EARNINGS PER SHARE The computation of net (loss) income per share was as follows: Three Months Ended September 30, Nine Months Ended September 30, 2023 2022 2023 2022 Net (loss) income attributable to AdTheorent Holding Company, Inc. $ ( 4,194 ) $ 5,725 $ ( 1,335 ) $ 21,762 Weighted-average common shares outstanding - basic 88,175,813 86,492,025 87,869,345 86,003,514 Effect of dilutive equity-based awards — 5,630,396 — 6,882,337 Weighted-average common shares outstanding - diluted 88,175,813 92,122,421 87,869,345 92,885,851 (Loss) earnings per share: Basic $ ( 0.05 ) $ 0.07 $ ( 0.02 ) $ 0.25 Diluted $ ( 0.05 ) $ 0.06 $ ( 0.02 ) $ 0.23 The following outstanding potentially dilutive securities were excluded from the calculation of diluted net (loss) income per common stockholder because their impact would have been anti-dilutive for the period presented, or their contingency conditions were not met: Three Months Ended September 30, Nine Months Ended September 30, 2023 2022 2023 2022 Stock options 6,663,685 1,541,098 6,663,685 565,303 Restricted stock units 6,066,092 2,840,126 6,066,092 2,563,980 Public warrants 10,541,657 10,541,657 10,541,657 10,541,657 Private placement warrants (1) 5,432,237 5,432,237 5,432,237 5,432,237 Seller's Earn-Out 6,785,714 6,785,714 6,785,714 6,785,714 Sponsor Earn-Out 598,875 598,875 598,875 598,875 Total 36,088,260 27,739,707 36,088,260 26,487,766 (1) Of the 5,432,237 Private Placement Warrants, 551,096 warrants are held in escrow subject to earn-out targets.

Leases

Leases	9 Months Ended
	Sep. 30, 2023
Leases [Abstract]
Leases	19. LEASES The Company has operating lease agreements for office space in the U.S. With the exception of the New York headquarters office lease, the Company’s leases expire at various times through July 2025 and certain leases may be extended at the Company’s option. The New York headquarters office lease expires in 2028 . The C ompany recognizes operating lease expense on a straight-line basis over the term of the lease. Additionally, the Company has short-term leases with an initial term of twelve months or less that are not recorded on the Condensed Consolidated Balance Sheets. Lease expense is allocated to operating expense categories (Platform operations, Sales and marketing, Technology and development, General and administrative) in the Condensed Consolidated Statements of Operations in proportion to headcount in each of these categories. The components of lease expense for the three and nine months ended September 30, 2023 and 2022 were as follows: Three Months Ended September 30, Nine Months Ended September 30, 2023 2022 2023 2022 Operating lease cost $ 246 $ 257 $ 745 $ 729 Short term lease cost $ 140 $ 49 $ 404 $ 98 Variable lease cost $ — $ — $ — $ — Supplemental cash flow information related to the Company’s operating leases for the nine months ended September 30, 2023 and 2022 were as follows: Nine Months Ended September 30, 2023 2022 Operating cash flows used for operating leases $ 1,116 $ 998 Right-of-use assets obtained in exchange for new operating lease obligations $ — $ 214 Supplemental balance sheet information related to the Company’s operating leases as of September 30, 2023 and December 31, 2022 were as follows: September 30, 2023 December 31, 2022 Weighted average remaining lease term (years) 4.88 5.59 Weighted average discount rate (%) 3.25 % 3.25 % Approximate future minimum lease payments for the Company’s operating leases are as follows as of September 30, 2023: September 30, 2023 Remainder of 2023 $ 368 2024 1,441 2025 1,433 2026 1,415 2027 1,364 Thereafter 1,023 Total operating lease payments 7,044 Less: Imputed interest ( 526 ) Total operating lease liabilities $ 6,518 In connection with one lease agreement, the Company maintains a letter of credit in the total amount of $ 983 as of both September 30, 2023 and December 31, 2022 .

Summary of Significant Accoun_2

Summary of Significant Accounting Policies (Policies)	9 Months Ended
	Sep. 30, 2023
Accounting Policies [Abstract]
Basis of Presentation and Principles of Consolidation	Basis of Presentation and Principles of Consolidation The accompanying Condensed Consolidated Financial Statements are prepared in accordance with accounting principles generally accepted in the United States of America (“GAAP”) and include the operations of the Company. All intercompany transactions have been eliminated in consolidation. In the opinion of management, the accompanying unaudited Condensed Consolidated Financial Statements contain all adjustments, consisting of only normal recurring adjustments, necessary for a fair statement of the Company's financial position as of September 30, 2023 and for the three and nine months ended September 30, 2023 and 2022. The Condensed Consolidated Balance Sheet as of December 31, 2022, has been derived from the Company's audited consolidated financial statements as of that date. The Condensed Consolidated Financial Statements should be read in conjunction with the Consolidated Financial Statements and notes thereto included in the Company's Annual Report on Form 10-K for the year ended December 31, 2022 , which include a complete set of footnote disclosures, including the Company's significant accounting policies. The results for interim periods are not necessarily indicative of the results that may be expected for a full fiscal year or for any other future period.
Summary of Significant Accounting Policies	Summary of Significant Accounting Policies There have been no material changes in the Company's significant accounting policies during the nine months ended September 30, 2023, as compared to the significant accounting policies described in Note 2 to the Consolidated Financial Statements for the year ended December 31, 2022 , except as detailed below.
Accounts Receivable and Allowance for Credit Losses (formerly Allowance for Doubtful Accounts)	Accounts Receivable and Allowance for Credit Losses (formerly Allowance for Doubtful Accounts) Accounts receivable are recorded at the invoiced amount, are unsecured, and do not bear interest. The allowance for credit losses is based on the best estimate of the amount of probable credit losses in existing accounts receivable. The Company reviews the allowance for credit losses on a quarterly basis. The allowance for credit losses is determined based on historical collection experience, the review in each period of the status of the then outstanding accounts receivable , while taking into consideration current customer information, and other macroeconomic and industry factors. Account balances are written off against the allowance when the Company believes it is probable the receivable will not be recovered.
Emerging Growth Company	Emerging Growth Company From time to time, new accounting pronouncements, or Accounting Standard Updates (“ASU”) are issued by the Financial Accounting Standards Board (“FASB”), or other standard setting bodies and adopted by the Company as of the specified effective date. Unless otherwise discussed, the impact of recently issued standards that are not yet effective will not have a material impact on the Company’s financial position or results of operations upon adoption. The Company is an emerging growth company (“EGC”) as defined in the Jumpstart Our Business Startups Act of 2012 (“JOBS Act”) and may take advantage of reduced reporting requirements that are otherwise applicable to public companies. Section 107 of the JOBS Act exempts emerging growth companies from being required to comply with new or revised financial accounting standards until private companies are required to comply with those standards. This means that when a standard is issued or revised and it has different application dates for public and nonpublic companies, the Company has the option to adopt the new or revised standard at the time nonpublic companies adopt the new or revised standard and can do so until such time that the Company either (i) irrevocably elects to “opt out” of such extended transition period or (ii) no longer qualifies as an emerging growth company. The Company has elected to use the extended transition period for complying with new or revised accounting standards unless the Company otherwise early adopts select standards.
Recent Accounting Pronouncements	Recent Accounting Pronouncements Recently Adopted Accounting Pronouncements ASU No. 2019-12, Income Taxes – Simplifying the Accounting for Income Taxes (Topic 740) In December 2019, the FASB issued ASU No. 2019-12, Income Taxes (Topic 740) (“ASU 2019-12”), which is part of the FASB’s overall simplification initiative to reduce the costs and complexity of applying accounting standards while maintaining or improving the usefulness of the information provided to users of financial statements. ASU 2019-12 simplifies accounting guidance for intra-period allocations, deferred tax liabilities, year-to-date losses in interim periods, franchise taxes, step-up in tax basis of goodwill, separate entity financial statements, and interim recognition of tax laws or rate changes. ASU 2019-12 is effective for emerging growth companies following private company adoption dates in fiscal years beginning after December 15, 2021, and interim periods within fiscal years beginning after December 15, 2022 , with early adoption permitted. The Company has determined the adoption did not have a material impact on the Condensed Consolidated Financial Statements. ASU No. 2016-13, Financial Instruments - Credit Losses (Topic 326) In June 2016, the FASB issued ASU No. 2016-13, Financial Instruments — Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments (“ASU 2016-13”), which requires entities to estimate all expected credit losses for certain types of financial instruments, including trade receivables, held at the reporting date based on historical experience, current conditions, and reasonable and supportable forecasts. The updated guidance also expands the disclosure requirements to enable users of financial statements to understand the entity’s assumptions, models and methods for estimating expected credit losses over the entire contractual term of the instrument from the date of initial recognition of that instrument. ASU 2016-13, as subsequently amended for various technical issues, is effective for emerging growth companies following private company adoption dates for fiscal years, and for interim periods within those fiscal years, beginning after December 15, 2022, with early adoption permitted. The Company adopted this ASU effective January 1, 2023 . The adoption of this ASU did not have a material impact on the Company’s Condensed Consolidated Financial Statements.

Accounts Receivable, Net (Table

Accounts Receivable, Net (Tables)	9 Months Ended
	Sep. 30, 2023
Receivables [Abstract]
Summary of Accounts Receivable, Net	Accounts receivable, net consisted of the following: September 30, December 31, 2023 2022 Accounts receivable $ 49,309 $ 56,243 Other receivables 40 483 $ 49,349 $ 56,726 Less: allowance for credit losses ( 656 ) ( 699 ) Accounts receivable, net $ 48,693 $ 56,027
Schedule of Changes in Allowance for credit losses	The following table presents changes in the allowance for credit losses: Three Months Ended September 30, Nine Months Ended September 30, 2023 2022 2023 2022 Beginning balance $ 663 $ 537 $ 699 $ 365 Reserve for credit losses 10 68 10 246 Write-offs, net of recoveries ( 17 ) — ( 53 ) ( 6 ) Ending balance $ 656 $ 605 $ 656 $ 605

Prepaid Expenses (Tables)

Prepaid Expenses (Tables)	9 Months Ended
	Sep. 30, 2023
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]
Schedule of Prepaid Expenses	Prepaid expenses consisted of the following: September 30, December 31, 2023 2022 Platform operations $ 1,344 $ 876 Software 576 501 Insurance 499 — Other 254 89 Total $ 2,673 $ 1,466

Property and Equipment, Net (Ta

Property and Equipment, Net (Tables)	9 Months Ended
	Sep. 30, 2023
Property, Plant and Equipment [Abstract]
Schedule of Property and Equipment, Net	Property and equipment, net consisted of the following: September 30, December 31, 2023 2022 Computers and equipment $ 908 $ 949 Less: accumulated depreciation ( 443 ) ( 429 ) Total $ 465 $ 520

Intangible Assets, Net (Tables)

Intangible Assets, Net (Tables)	9 Months Ended
	Sep. 30, 2023
Goodwill and Intangible Assets Disclosure [Abstract]
Schedule of Intangible Assets, Net	Intangible assets, net consisted of the following: September 30, 2023 Remaining Weighted Average Useful Life (in years) Gross amount Accumulated amortization Net carrying amount Software — $ 6,038 $ ( 6,038 ) $ — Capitalized software costs 1.3 14,435 ( 9,890 ) 4,545 Customer relationships 0.3 31,492 ( 30,373 ) 1,119 Trademarks/tradename 3.3 10,195 ( 6,886 ) 3,309 Total $ 62,160 $ ( 53,187 ) $ 8,973 December 31, 2022 Remaining Weighted Average Useful Life (in years) Gross amount Accumulated amortization Net carrying amount Software — $ 6,038 $ ( 6,038 ) $ — Capitalized software costs 1.1 10,173 ( 7,535 ) 2,638 Customer relationships 1.0 31,492 ( 27,017 ) 4,475 Trademarks/tradename 4.0 10,195 ( 6,125 ) 4,070 Total $ 57,898 $ ( 46,715 ) $ 11,183
Summary of Amortization Expense	Amortization expense was included in the Company’s Condensed Consolidated Statements of Operations as follows: Three Months Ended September 30, Nine Months Ended September 30, 2023 2022 2023 2022 Platform operations $ 798 $ 549 $ 2,173 $ 1,615 Sales and marketing 1,371 1,370 4,111 4,110 Technology and development 98 — 181 140 General and administrative 2 3 8 7 Total $ 2,269 $ 1,922 $ 6,473 $ 5,872
Schedule of Future Amortization of Intangible Assets	Estimated future amortization of intangible assets as of September 30, 2023 is as follows: Remainder of 2023 $ 2,285 2024 3,881 2025 1,782 2026 1,016 2027 7 Thereafter 2 Total $ 8,973

Accrued Expenses (Tables)

Accrued Expenses (Tables)	9 Months Ended
	Sep. 30, 2023
Payables and Accruals [Abstract]
Schedule of Accrued Expenses	Accrued expenses consisted of the following: September 30, 2023 December 31, 2022 Campaign costs $ 2,128 $ 4,081 Income taxes 1,852 120 Deferred revenues 430 1,149 Platform operations 373 401 Other 293 473 Total $ 5,076 $ 6,224

Equity-Based Compensation (Tabl

Equity-Based Compensation (Tables)	9 Months Ended
	Sep. 30, 2023
Share-Based Payment Arrangement [Abstract]
Summary of Stock Option Activity	The following table summarizes stock option activity for the nine months ended September 30, 2023: Stock Options Weighted-Average Exercise Price Outstanding as of December 31, 2022 6,915,715 $ 0.61 Exercised ( 233,467 ) 0.64 Forfeited ( 18,563 ) 0.74 Outstanding as of September 30, 2023 6,663,685 $ 0.60 Exercisable as of September 30, 2023 6,663,685 $ 0.60
Summary of RSU Activity	The following summarizes RSU activity for the nine months ended September 30, 2023: Restricted Stock Units Weighted-Average Grant Date Fair Value Outstanding as of December 31, 2022 2,764,681 $ 9.23 Granted 5,564,806 1.51 Vested ( 1,055,472 ) 9.01 Forfeited ( 169,943 ) 7.83 Outstanding as of September 30, 2023 7,104,072 $ 3.25
Summary of Fair Value of Purchase rights Granted under Black-Scholes Option-Pricing Model Assumptions	It was estimated by applying the Black-Scholes Option-Pricing model (“BSM”) to the purchase period in the offering period using the following assumptions: July 15, 2023 Grant price $ 1.50 Expected term 6 months Expected volatility 65.19 % Risk-free interest rate 5.52 % Expected dividend yield 0.00 %
Summary of Total Equity-based Compensation Expense	The following table summarizes the total equity-based compensation expense included in the Condensed Consolidated Statements of Operations: Three Months Ended September 30, Nine Months Ended September 30, 2023 2022 2023 2022 Platform operations $ 412 $ 485 $ 919 $ 1,365 Sales and marketing 1,031 920 2,373 2,773 Technology and development 251 424 640 1,448 General and administrative 890 954 1,992 3,041 Total equity-based compensation expense $ 2,584 $ 2,783 $ 5,924 $ 8,627

Seller's Earn-Out (Tables)

Seller's Earn-Out (Tables)	9 Months Ended
	Sep. 30, 2023
Business Acquisition [Line Items]
Schedule of Fair Value of Options	It was estimated by applying the Black-Scholes Option-Pricing model (“BSM”) to the purchase period in the offering period using the following assumptions: July 15, 2023 Grant price $ 1.50 Expected term 6 months Expected volatility 65.19 % Risk-free interest rate 5.52 % Expected dividend yield 0.00 %
Seller's Earn-Out
Business Acquisition [Line Items]
Schedule of Fair Value of Options	Assumptions used in the valuation were as follows: September 30, 2023 December 31, 2022 Stock price $ 1.29 $ 1.66 Dividend yield 0.00 % 0.00 % Volatility 70.00 % 75.00 % Risk-free rate 4.80 % 4.37 % Forecast period (in years) 1.23 1.98
Schedule of Change in Fair Value	The following table presents activity for the Seller's Earn-Out measured using the Monte Carlo model, described above, as of September 30, 2023 and December 31, 2022: Seller's Earn-Out Balance at December 31, 2022 $ 773 Change in fair value ( 750 ) Balance at September 30, 2023 $ 23
Equity based Compensation Expense Related to the Sellers Earn Out to Exchanged Option and Exchanged Unit holders	Equity-based compensation expense related to the Seller’s Earn-Out to Exchanged Option an d Exchanged Unit holders was included in the Company’s Condensed Consolidated Statements of Operations for the three and nine months ended September 30, 2022 as follows: Three Months Ended Nine Months Ended September 30, 2022 September 30, 2022 Platform operations $ 44 $ 161 Sales and marketing 110 405 Technology and development 37 131 General and administrative 182 667 Total $ 373 $ 1,364

Warrants (Tables)

Warrants (Tables)	9 Months Ended
	Sep. 30, 2023
Warrants and Rights Note Disclosure [Abstract]
Summary of Number of Outstanding Public and Private Placement Warrants and Corresponding Exercise Price	The following table summarizes the number of outstanding Public Warrants and Private Placement Warrants and the corresponding exercise price: September 30, 2023 December 31, 2022 Exercise Price Expiration Date Public Warrants 10,541,657 10,541,657 $ 11.50 December 21, 2026 Private Placement Warrants 5,432,237 5,432,237 $ 11.50 December 21, 2026
Schedule of Key Inputs into Monte Carlo Simulation Model for Private Placement Warrants at Initial and Subsequent Measurement Date	The key inputs into the BSM and Monte Carlo simulation model as of September 30, 2023 and December 31, 2022, respectively, for the Private Placement Warrants were as follows: September 30, December 31, 2023 2022 Risk-free interest rate 4.78 % 4.07 % Dividend yield 0.00 % 0.00 % Expected term (years) 3.23 3.98 Expected Volatility 70.00 % 69.50 % Exercise Price $ 11.50 $ 11.50 Stock Price $ 1.29 $ 1.66
Schedule of Changes in Fair Value of Public and Private Placement Warrants	The following table presents the changes in the fair value of the Public and Private Placement Warrants: Public Warrants Private Placement Warrants Total Warrant Liabilities Fair value as of December 31, 2022 $ 1,054 $ 1,244 $ 2,298 Change in valuation inputs or other assumptions ( 632 ) ( 804 ) ( 1,436 ) Fair value as of September 30, 2023 $ 422 $ 440 $ 862

Symetryml and Symetryml Holdi_2

Symetryml and Symetryml Holdings (Tables)	9 Months Ended
	Sep. 30, 2023
Equity [Abstract]
Summary of Amounts Related to Accounting Deconsolidation Transaction	The following table shows the amounts related to the accounting for the Deconsolidation: For the Nine Months Ended September 30, 2022 Fair value of consideration received $ — Fair value of retained noncontrolling interest 861 Carrying amount of deconsolidated noncontrolling interest 2,372 Less: Carrying amount of deconsolidated net assets ( 1,294 ) Gain on Deconsolidation $ 1,939

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	9 Months Ended
	Sep. 30, 2023
Fair Value Disclosures [Abstract]
Schedule of company's assets and liabilities that are measured at fair value	The following tables summarize the Company's assets and liabilities measured at fair value on a recurring basis by level within the fair value hierarchy: September 30, 2023 Level 1 Level 2 Level 3 Total Assets: Investment in SymetryML Holdings(2) $ — $ — $ 636 $ 636 Total assets $ — $ — $ 636 $ 636 Liabilities: Public warrants(1) $ 422 $ — $ — $ 422 Private placement warrants(1) — 440 — 440 Seller's Earn-Out(1) — — 23 23 Total liabilities $ 422 $ 440 $ 23 $ 885 December 31, 2022 Level 1 Level 2 Level 3 Total Assets: Investment in SymetryML Holdings(2) $ — $ — $ 789 $ 789 Total assets $ — $ — $ 789 $ 789 Liabilities: Public warrants(1) $ 1,054 $ — $ — $ 1,054 Private placement warrants(1) — 1,244 — 1,244 Seller's Earn-Out(1) — — 773 773 Total liabilities $ 1,054 $ 1,244 $ 773 $ 3,071 (1) Refe r to Note 15 — Seller's Earn-Out and Note 16 — Warrants included in the Company's Annual Report on Form 10-K for the year ended December 31, 2022, for further i nformation about the initial and subsequent measurement, including significant assumptions and valuation methodologies of these instruments. (2) Refe r to Note 16 — SymetryML and SymetryML Holdings belo w for further information about the initial measurement, including significant assumptions and valuation methodologies of this investment.
Summary of rollforward of assets and liabilities classified as Level 3	The following tables present a rollforward of the Company's assets and liabilities classified as Level 3 for nine months ended September 30, 2023 and 2022. Nine Months Ended Investment in SymetryML Holdings Seller's Earn-Out Liability Balance as December 31, 2022 $ 789 $ 773 Measurement adjustments ( 153 ) ( 750 ) Balance as of September 30, 2023 $ 636 $ 23 Nine Months Ended Investment in SymetryML Holdings Seller's Earn-Out Liability Balance as December 31, 2021 $ — $ 18,081 Additions 861 — Measurement adjustments ( 49 ) ( 15,664 ) Balance as of September 30, 2022 $ 812 $ 2,417

(Loss) Earnings Per Share (Tabl

(Loss) Earnings Per Share (Tables)	9 Months Ended
	Sep. 30, 2023
Earnings Per Share [Abstract]
Schedule of Computation of Net Income Per Share	The computation of net (loss) income per share was as follows: Three Months Ended September 30, Nine Months Ended September 30, 2023 2022 2023 2022 Net (loss) income attributable to AdTheorent Holding Company, Inc. $ ( 4,194 ) $ 5,725 $ ( 1,335 ) $ 21,762 Weighted-average common shares outstanding - basic 88,175,813 86,492,025 87,869,345 86,003,514 Effect of dilutive equity-based awards — 5,630,396 — 6,882,337 Weighted-average common shares outstanding - diluted 88,175,813 92,122,421 87,869,345 92,885,851 (Loss) earnings per share: Basic $ ( 0.05 ) $ 0.07 $ ( 0.02 ) $ 0.25 Diluted $ ( 0.05 ) $ 0.06 $ ( 0.02 ) $ 0.23
Summary of Outstanding Potentially Dilutive Securities	The following outstanding potentially dilutive securities were excluded from the calculation of diluted net (loss) income per common stockholder because their impact would have been anti-dilutive for the period presented, or their contingency conditions were not met: Three Months Ended September 30, Nine Months Ended September 30, 2023 2022 2023 2022 Stock options 6,663,685 1,541,098 6,663,685 565,303 Restricted stock units 6,066,092 2,840,126 6,066,092 2,563,980 Public warrants 10,541,657 10,541,657 10,541,657 10,541,657 Private placement warrants (1) 5,432,237 5,432,237 5,432,237 5,432,237 Seller's Earn-Out 6,785,714 6,785,714 6,785,714 6,785,714 Sponsor Earn-Out 598,875 598,875 598,875 598,875 Total 36,088,260 27,739,707 36,088,260 26,487,766 (1) Of the 5,432,237 Private Placement Warrants, 551,096 warrants are held in escrow subject to earn-out targets.

Leases (Tables)

Leases (Tables)	9 Months Ended
	Sep. 30, 2023
Leases [Abstract]
Schedule of Components of Lease Expense	The components of lease expense for the three and nine months ended September 30, 2023 and 2022 were as follows: Three Months Ended September 30, Nine Months Ended September 30, 2023 2022 2023 2022 Operating lease cost $ 246 $ 257 $ 745 $ 729 Short term lease cost $ 140 $ 49 $ 404 $ 98 Variable lease cost $ — $ — $ — $ —
Summary of Supplemental Cash Flow Information Related to Operating Leases	Supplemental cash flow information related to the Company’s operating leases for the nine months ended September 30, 2023 and 2022 were as follows: Nine Months Ended September 30, 2023 2022 Operating cash flows used for operating leases $ 1,116 $ 998 Right-of-use assets obtained in exchange for new operating lease obligations $ — $ 214
Schedule of Supplemental Balance Sheet Information Related to Operating Leases	Supplemental balance sheet information related to the Company’s operating leases as of September 30, 2023 and December 31, 2022 were as follows: September 30, 2023 December 31, 2022 Weighted average remaining lease term (years) 4.88 5.59 Weighted average discount rate (%) 3.25 % 3.25 %
Summary of Future Minimum Lease Payments	Approximate future minimum lease payments for the Company’s operating leases are as follows as of September 30, 2023: September 30, 2023 Remainder of 2023 $ 368 2024 1,441 2025 1,433 2026 1,415 2027 1,364 Thereafter 1,023 Total operating lease payments 7,044 Less: Imputed interest ( 526 ) Total operating lease liabilities $ 6,518

Summary of Significant Accoun_3

Summary of Significant Accounting Policies - Additional Information (Details)	Sep. 30, 2023
ASU 2019-12
Summary Of Significant Accounting Policies [Line Items]
Change in accounting principle, accounting standards update, adopted	true
Change in accounting principle, accounting standards update, adoption date	Dec. 15, 2022
Change in accounting principle, accounting standards update, immaterial effect	true
ASU 2016-13
Summary Of Significant Accounting Policies [Line Items]
Change in accounting principle, accounting standards update, adopted	true
Change in accounting principle, accounting standards update, adoption date	Jan. 01, 2023
Change in accounting principle, accounting standards update, immaterial effect	true

Revenue Recognition - Additiona

Revenue Recognition - Additional Information (Details) - USD ($)	9 Months Ended
	Sep. 30, 2023	Dec. 31, 2022
Disaggregation Of Revenue [Line Items]
Revenue, practical expedient, incremental cost of obtaining contract [true false]	true
Contract cost asset recognized	$ 0	$ 0
Revenue, Practical Expedient, Initial Application and Transition, Nondisclosure of Transaction Price Allocation to Remaining Performance Obligation [true false]	true

Accounts Receivable, Net - Summ

Accounts Receivable, Net - Summary of Accounts Receivable, Net (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Receivables [Abstract]
Accounts receivable	$ 49,309	$ 56,243
Other receivables	40	483
Accounts and other receivables, Gross	49,349	56,726
Less: allowance for credit losses	(656)	(699)
Accounts receivable, net	$ 48,693	$ 56,027

Accounts Receivable, Net - Addi

Accounts Receivable, Net - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Receivables [Abstract]
Provision for credit losses	$ 10	$ 68	$ 10	$ 240

Accounts Receivable, Net - Sche

Accounts Receivable, Net - Schedule of Changes in Allowance for Doubtful Accounts (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Receivables [Abstract]
Beginning balance	$ 663	$ 537	$ 699	$ 365
Reserve for credit losses	10	68	10	246
Write-offs, net of recoveries	(17)	0	(53)	(6)
Ending balance	$ 656	$ 605	$ 656	$ 605

Prepaid Expenses - Schedule of

Prepaid Expenses - Schedule of Prepaid Expenses (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]
Platform operations	$ 1,344	$ 876
Insurance	499	0
Software	576	501
Other	254	89
Total	$ 2,673	$ 1,466

Property and Equipment, Net - S

Property and Equipment, Net - Schedule of Property and Equipment, Net (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Property Plant And Equipment [Line Items]
Less: accumulated depreciation	$ (443)	$ (429)
Total	465	520
Computers and Equipment
Property Plant And Equipment [Line Items]
Property and equipment, net, gross	$ 908	$ 949

Property and Equipment, Net - A

Property and Equipment, Net - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Property, Plant and Equipment [Abstract]
Depreciation expense	$ 48	$ 51	$ 146	$ 143

Intangible Assets, Net - Schedu

Intangible Assets, Net - Schedule of Intangible Assets, Net (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Finite Lived Intangible Assets [Line Items]
Gross amount	$ 62,160	$ 57,898
Accumulated amortization	(53,187)	(46,715)
Net carrying amount	$ 8,973	$ 11,183
Software
Finite Lived Intangible Assets [Line Items]
Remaining Weighted Average Useful Life (in years)	0 years	0 years
Gross amount	$ 6,038	$ 6,038
Accumulated amortization	(6,038)	(6,038)
Net carrying amount	$ 0	$ 0
Capitalized Software Costs
Finite Lived Intangible Assets [Line Items]
Remaining Weighted Average Useful Life (in years)	1 year 3 months 18 days	1 year 1 month 6 days
Gross amount	$ 14,435	$ 10,173
Accumulated amortization	(9,890)	(7,535)
Net carrying amount	$ 4,545	$ 2,638
Customer Relationships
Finite Lived Intangible Assets [Line Items]
Remaining Weighted Average Useful Life (in years)	3 months 18 days	1 year
Gross amount	$ 31,492	$ 31,492
Accumulated amortization	(30,373)	(27,017)
Net carrying amount	$ 1,119	$ 4,475
Trademarks/tradename
Finite Lived Intangible Assets [Line Items]
Remaining Weighted Average Useful Life (in years)	3 years 3 months 18 days	4 years
Gross amount	$ 10,195	$ 10,195
Accumulated amortization	(6,886)	(6,125)
Net carrying amount	$ 3,309	$ 4,070

Intangible Assets, Net - Summar

Intangible Assets, Net - Summary of Amortization Expense on Intangible Assets (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Finite Lived Intangible Assets [Line Items]
Amortization expense	$ 2,269	$ 1,922	$ 6,473	$ 5,872
Platform Operations
Finite Lived Intangible Assets [Line Items]
Amortization expense	798	549	2,173	1,615
Sales and Marketing
Finite Lived Intangible Assets [Line Items]
Amortization expense	1,371	1,370	4,111	4,110
Technology and Development
Finite Lived Intangible Assets [Line Items]
Amortization expense	98	0	181	140
General and Administrative Expense
Finite Lived Intangible Assets [Line Items]
Amortization expense	$ 2	$ 3	$ 8	$ 7

Intangible Assets, Net - Additi

Intangible Assets, Net - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Goodwill and Intangible Assets Disclosure [Abstract]
Amortization expense for Capitalized software costs	$ 896	$ 549	$ 2,354	$ 1,614
Amortization expense	$ 2,269	$ 1,922	$ 6,473	$ 5,872

Intangible Assets, Net - Sche_2

Intangible Assets, Net - Schedule of Future Amortization of Intangible Assets (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Goodwill and Intangible Assets Disclosure [Abstract]
Remainder of 2023	$ 2,285
2024	3,881
2025	1,782
2026	1,016
2027	7
Thereafter	2
Net carrying amount	$ 8,973	$ 11,183

Goodwill - Additional Informati

Goodwill - Additional Information (Details)	9 Months Ended
	Sep. 30, 2023 USD ($) Segment	Dec. 31, 2022 USD ($)
Goodwill and Intangible Assets Disclosure [Abstract]
Number of reporting units | Segment	1
Goodwill	$ 34,842,000	$ 34,842,000
Impairment of goodwill	$ 0

Accrued Expenses - Schedule of

Accrued Expenses - Schedule of Accrued Expenses (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Payables and Accruals [Abstract]
Campaign costs	$ 2,128	$ 4,081
Income taxes	1,852	120
Deferred revenues	430	1,149
Platform operations	373	401
Other	293	473
Total	$ 5,076	$ 6,224

Debt - Additional Information (

Debt - Additional Information (Details) - USD ($)	Dec. 22, 2021	Sep. 30, 2023	Dec. 31, 2022
Letters of Credit
Debt Instrument [Line Items]
Line of credit		$ 983,000	$ 983,000
Senior Secured Agreement | Silicon Valley Bank (“SVB”)
Debt Instrument [Line Items]
Debt instrument, maturity date	Dec. 22, 2026
Senior Secured Agreement | Letters of Credit
Debt Instrument [Line Items]
Line of credit		983,000	983,000
Senior Secured Agreement | Letters of Credit | Silicon Valley Bank (“SVB”)
Debt Instrument [Line Items]
Maximum borrowing capacity	$ 10,000,000
Senior Secured Agreement | Revolving Credit Facility
Debt Instrument [Line Items]
Line of credit		$ 0	$ 0
Senior Secured Agreement | Revolving Credit Facility | Maximum | Silicon Valley Bank (“SVB”)
Debt Instrument [Line Items]
Maximum borrowing capacity	40,000,000
Senior Secured Agreement | Swing Line Loans | Silicon Valley Bank (“SVB”)
Debt Instrument [Line Items]
Maximum borrowing capacity	$ 10,000,000

Income Taxes - Additional Infor

Income Taxes - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Income Tax Disclosure [Abstract]
Provision for income taxes	$ (6,254)	$ (1,095)	$ (938)	$ 540
Annual effective income tax rates			36.10%	15%
Statutory income tax rate			21%

Equity-Based Compensation - Add

Equity-Based Compensation - Additional Information (Details) - USD ($)		3 Months Ended		9 Months Ended
	May 24, 2023	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022	Jul. 15, 2023	Jun. 30, 2023	Jan. 01, 2023	Dec. 31, 2021
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Options available for grant								4,348,415
Compensation expense				$ 5,924,000	$ 8,627,000
Capitalized Software Development Costs
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Compensation expense		$ 113,000	$ 0	257,000	0
Stock Option
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Compensation expense		0	62,000	$ 3,000	187,000
RSUs
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Share-based compensation, equity instruments other than options, granted	5,564,806			5,564,806
Share-based payment award, equity instruments other than options, granted, fair value per unit	$ 1.51			$ 1.51
Compensation expense		2,558,000	2,694,000	$ 5,823,000	8,413,000
Total unrecognized compensation expense		$ 15,797,000		$ 15,797,000
Total unrecognized compensation cost, expected weighted average period				1 year 7 months 6 days
2021 Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of common units, authorized		10,131,638		10,131,638
Annual increase in number of shares reserved for issuance percent				5%
Options available for grant		6,627,316		6,627,316
Employee Stock Purchase Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Percentage of fair markets value of common stock share on offering date									85%
Percentage of fair market value of common stock share on purchase date									85%
Compensation expense		$ 26,000	$ 27,000	$ 0	$ 27,000
Fair value of purchase rights granted						$ 510
Aggregate number of common stock shares reserved for future issuance							2,552,353	869,863	2,026,328

Equity-Based Compensation - Sum

Equity-Based Compensation - Summary of Stock Option Activity (Details)	9 Months Ended
	Sep. 30, 2023 $ / shares shares
Share-Based Payment Arrangement [Abstract]
Stock Options, Outstanding, Beginning balance | shares	6,915,715
Stock Options, Exercised | shares	(233,467)
Stock Options, Forfeited | shares	(18,563)
Stock Options, Outstanding, Ending balance | shares	6,663,685
Stock Options, Exercisable | shares	6,663,685
Weighted Average Exercise Price, Outstanding, Beginning balance | $ / shares	$ 0.61
Weighted Average Exercise Price, Exercised | $ / shares	0.64
Weighted Average Exercise Price, Forfeited | $ / shares	0.74
Weighted Average Exercise Price, Outstanding, Ending balance | $ / shares	0.6
Weighted Average Exercise Price, Exercisable | $ / shares	$ 0.6

Equity-Based Compensation - S_2

Equity-Based Compensation - Summary of RSU Activity (Details) - RSUs - $ / shares		9 Months Ended
	May 24, 2023	Sep. 30, 2023
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Restricted Stock Units, Outstanding, Beginning of the year		2,764,681
Equity Option Awards, Granted	5,564,806	5,564,806
Restricted Stock Units, Vested		(1,055,472)
Restricted Stock Units, Forfeited		(169,943)
Restricted Stock Units, Outstanding, End of the year		7,104,072
Weighted Average Grant-Date Fair Value per Unit, Nonvested Beginning of the year		$ 9.23
Weighted Average Grant-Date Fair Value per Unit, Granted	$ 1.51	1.51
Weighted Average Grant-Date Fair Value per Unit, Vested		9.01
Weighted Average Grant-Date Fair Value per Unit, Forfeited		7.83
Weighted Average Grant-Date Fair Value per Unit, Nonvested End of the year		$ 3.25

Equity-Based Compensation - S_3

Equity-Based Compensation - Summary of Fair Value of Purchase rights Granted under Black-Scholes Option-Pricing Model Assumptions (Details)	Jul. 15, 2023 $ / shares
Share-Based Payment Arrangement [Abstract]
Grant price	$ 1.5
Expected term	6 months
Expected volatility	65.19%
Risk-free interest rate	5.52%
Expected dividend yield	0%

Equity-Based Compensation - S_4

Equity-Based Compensation - Summary of Total Equity-based Compensation Expense (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Total equity-based compensation expense	$ 2,584	$ 2,783	$ 5,924	$ 8,627
Platform Operations
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Total equity-based compensation expense	412	485	919	1,365
Sales and Marketing
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Total equity-based compensation expense	1,031	920	2,373	2,773
Technology and Development
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Total equity-based compensation expense	251	424	640	1,448
General and Administrative Expense
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Total equity-based compensation expense	$ 890	$ 954	$ 1,992	$ 3,041

Equity - Additional Information

Equity - Additional Information (Details) - shares	9 Months Ended
	Sep. 30, 2023	Dec. 31, 2022
Class of Stock [Line Items]
Shares authorized	370,000,000
Common stock, shares authorized	350,000,000	350,000,000
Preferred stock, shares authorized	20,000,000	20,000,000
Common stock voting rights	one
Common stock, shares issued	88,206,048	86,968,309
Common stock, shares outstanding	88,206,048	86,968,309
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0

Seller's Earn-Out - Schedule of

Seller's Earn-Out - Schedule of Assumption Used in Valuation (Details) - Seller's Earn-Out	Sep. 30, 2023	Dec. 31, 2022
Stock Price
Business Acquisition [Line Items]
Warrants and rights outstanding, measurement input	1.29	1.66
Dividend Yield
Business Acquisition [Line Items]
Warrants and rights outstanding, measurement input	0	0
Volatility
Business Acquisition [Line Items]
Warrants and rights outstanding, measurement input	70	75
Risk-free Rate
Business Acquisition [Line Items]
Warrants and rights outstanding, measurement input	4.8	4.37
Forecast Period (in years)
Business Acquisition [Line Items]
Warrants and rights outstanding, measurement input	1.23	1.98

Seller's Earn-Out - Schedule _2

Seller's Earn-Out - Schedule of Change in Fair Value (Details) - Seller's Earn-Out $ in Thousands	9 Months Ended
	Sep. 30, 2023 USD ($)
Business Acquisition [Line Items]
Fair value as of beginning balance	$ 773
Change in fair value	(750)
Fair value as of ending balance	$ 23

Seller's Earn-Out - Additional

Seller's Earn-Out - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Business Acquisition [Line Items]
Seller's Earn-Out equity-based compensation			$ 0	$ 1,364
Seller's Earn-Out
Business Acquisition [Line Items]
Seller's Earn-Out equity-based compensation	$ 0	$ 373	$ 0	$ 1,364

Seller's Earn-Out - Equity base

Seller's Earn-Out - Equity based Compensation Expense Related to the Sellers Earn Out to Exchanged Option and Exchanged U (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Business Acquisition [Line Items]
Total equity-based compensation expense	$ 2,584	$ 2,783	$ 5,924	$ 8,627
Seller's Earn-Out
Business Acquisition [Line Items]
Total equity-based compensation expense		373		1,364
Platform Operations
Business Acquisition [Line Items]
Total equity-based compensation expense	412	485	919	1,365
Platform Operations | Seller's Earn-Out
Business Acquisition [Line Items]
Total equity-based compensation expense		44		161
Sales and Marketing
Business Acquisition [Line Items]
Total equity-based compensation expense	1,031	920	2,373	2,773
Sales and Marketing | Seller's Earn-Out
Business Acquisition [Line Items]
Total equity-based compensation expense		110		405
Technology and Development
Business Acquisition [Line Items]
Total equity-based compensation expense	251	424	640	1,448
Technology and Development | Seller's Earn-Out
Business Acquisition [Line Items]
Total equity-based compensation expense		37		131
General and Administrative Expense
Business Acquisition [Line Items]
Total equity-based compensation expense	$ 890	954	$ 1,992	3,041
General and Administrative Expense | Seller's Earn-Out
Business Acquisition [Line Items]
Total equity-based compensation expense		$ 182		$ 667

Warrants - Summary of Number of

Warrants - Summary of Number of Outstanding Public and Private Placement Warrants and Corresponding Exercise Price (Details) - $ / shares	Sep. 30, 2023	Dec. 31, 2022
Public Warrants
Class of Warrant or Right [Line Items]
Warrants Outstanding	10,541,657	10,541,657
Exercise Price	$ 11.5
Expiration Date	Dec. 21, 2026
Private Placement Warrants
Class of Warrant or Right [Line Items]
Warrants Outstanding	5,432,237	5,432,237
Exercise Price	$ 11.5
Expiration Date	Dec. 21, 2026

Warrants - Additional Informati

Warrants - Additional Information (Details)	9 Months Ended
	Sep. 30, 2023 Item $ / shares shares	Dec. 31, 2022 $ / shares shares
Public Warrants
Class of Warrant or Right [Line Items]
Exercise price per share	$ 11.5
Warrants Outstanding | shares	10,541,657	10,541,657
Price per warrant outstanding	$ 0.04	$ 0.1
Private Placement Warrants
Class of Warrant or Right [Line Items]
Exercise price per share	$ 11.5
Warrants Outstanding | shares	5,432,237	5,432,237
Price per warrant outstanding	$ 0.08	$ 0.23
Private Placement Warrants | Release of Warrants When VWAP of Common Stock Equals or Exceeds $14.00
Class of Warrant or Right [Line Items]
Exercise price per share	$ 14
Threshold trading days for redemption of public warrants | Item	20
Threshold consecutive trading days for redemption of public warrants | Item	30
Warrants held in escrow | shares	551,096

Warrants - Schedule of Key Inpu

Warrants - Schedule of Key Inputs into Monte Carlo Simulation Model for Private Placement Warrants at Initial and Subsequent Measurement Date (Details) - Level 2 - Recurring - Private Placement Warrants	Sep. 30, 2023 yr	Dec. 31, 2022 yr
Risk-free interest rate
Class of Warrant or Right [Line Items]
Warrants and Rights Outstanding, Measurement Input	4.78	4.07
Dividend yield
Class of Warrant or Right [Line Items]
Warrants and Rights Outstanding, Measurement Input	0	0
Expected term (years)
Class of Warrant or Right [Line Items]
Warrants and Rights Outstanding, Measurement Input	3.23	3.98
Volatility
Class of Warrant or Right [Line Items]
Warrants and Rights Outstanding, Measurement Input	70	69.5
Exercise Price
Class of Warrant or Right [Line Items]
Warrants and Rights Outstanding, Measurement Input	11.5	11.5
Stock Price
Class of Warrant or Right [Line Items]
Warrants and Rights Outstanding, Measurement Input	1.29	1.66

Warrants - Schedule of Changes

Warrants - Schedule of Changes in Fair Value of Public and Private Placement Warrants (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2023 USD ($)
Public Warrants
Class of Warrant or Right [Line Items]
Fair value as of beginning balance	$ 1,054
Change in valuation inputs or other assumptions	(632)
Fair value as of ending balance	422
Private Placement Warrants
Class of Warrant or Right [Line Items]
Fair value as of beginning balance	1,244
Change in valuation inputs or other assumptions	(804)
Fair value as of ending balance	440
Warrants
Class of Warrant or Right [Line Items]
Fair value as of beginning balance	2,298
Change in valuation inputs or other assumptions	(1,436)
Fair value as of ending balance	$ 862

Symetryml and Symetryml Holdi_3

Symetryml and Symetryml Holdings - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended		12 Months Ended
	Mar. 31, 2022	Sep. 30, 2023	Sep. 30, 2022	Dec. 31, 2022
Class of Stock [Line Items]
Gain on deconsolidation of SymetryML			$ 1,939
SymetryML Holdings
Class of Stock [Line Items]
Percentage of interests owned by noncontrolling interests		0%		0%
Gain on deconsolidation of SymetryML	$ 1,939
Remeasurement of retained noncontrolling investment of fair value	$ 541
Fair value of retained investment		$ 636		$ 789
SymetryML Holdings | Other Income
Class of Stock [Line Items]
Gain on deconsolidation of SymetryML			$ 1,939
Class A Common Stock | SymetryML Holdings | Non Controlling Members Interest
Class of Stock [Line Items]
Percentage of interest owned by employees		50%
Class B Common Stock | SymetryML Holdings | Employees | Non Controlling Members Interest
Class of Stock [Line Items]
Percentage of interest owned by employees		50%

Symetryml and Symetryml Holdi_4

Symetryml and Symetryml Holdings - Summary of Amounts Related to Accounting for Deconsolidation Transaction (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2022 USD ($)
Equity [Abstract]
Fair value of consideration received	$ 0
Fair value of retained noncontrolling interest	861
Carrying amount of deconsolidated noncontrolling interest	2,372
Less: Carrying amount of deconsolidated net assets	(1,294)
Gain on Deconsolidation	$ 1,939

Fair Value Measurements - Fair

Fair Value Measurements - Fair Value of Assets and Liabilities Measured On Recurring Basis (Details) - USD ($) $ in Thousands		Sep. 30, 2023	Dec. 31, 2022
Liabilities:
Fair value of warrants and/or earn-out outstanding		$ 862	$ 2,298
Fair Value, Recurring
Assets:
Total assets		636	789
Liabilities:
Fair value of warrants and/or earn-out outstanding		885	3,071
Level 1 | Fair Value, Recurring
Assets:
Total assets		0	0
Liabilities:
Fair value of warrants and/or earn-out outstanding		422	1,054
Level 2 | Fair Value, Recurring
Assets:
Total assets		0	0
Liabilities:
Fair value of warrants and/or earn-out outstanding		440	1,244
Level 3 | Fair Value, Recurring
Assets:
Total assets		636	789
Liabilities:
Fair value of warrants and/or earn-out outstanding		23	773
Public Warrants | Fair Value, Recurring
Liabilities:
Fair value of warrants and/or earn-out outstanding	[1]	422	1,054
Public Warrants | Level 1 | Fair Value, Recurring
Liabilities:
Fair value of warrants and/or earn-out outstanding	[1]	422	1,054
Public Warrants | Level 2 | Fair Value, Recurring
Liabilities:
Fair value of warrants and/or earn-out outstanding	[1]	0	0
Public Warrants | Level 3 | Fair Value, Recurring
Liabilities:
Fair value of warrants and/or earn-out outstanding	[1]	0	0
Private Placement Warrants | Fair Value, Recurring
Liabilities:
Fair value of warrants and/or earn-out outstanding	[1]	440	1,244
Private Placement Warrants | Level 1 | Fair Value, Recurring
Liabilities:
Fair value of warrants and/or earn-out outstanding	[1]	0	0
Private Placement Warrants | Level 2 | Fair Value, Recurring
Liabilities:
Fair value of warrants and/or earn-out outstanding	[1]	440	1,244
Private Placement Warrants | Level 3 | Fair Value, Recurring
Liabilities:
Fair value of warrants and/or earn-out outstanding	[1]	0	0
Seller's Earn-Out | Fair Value, Recurring
Liabilities:
Fair value of warrants and/or earn-out outstanding	[1]	23	773
Seller's Earn-Out | Level 1 | Fair Value, Recurring
Liabilities:
Fair value of warrants and/or earn-out outstanding	[1]	0	0
Seller's Earn-Out | Level 2 | Fair Value, Recurring
Liabilities:
Fair value of warrants and/or earn-out outstanding	[1]	0	0
Seller's Earn-Out | Level 3 | Fair Value, Recurring
Liabilities:
Fair value of warrants and/or earn-out outstanding	[1]	23	773
Investment in SymetryML Holdings | Fair Value, Recurring
Assets:
Total assets	[2]	636	789
Investment in SymetryML Holdings | Level 1 | Fair Value, Recurring
Assets:
Total assets	[2]	0	0
Investment in SymetryML Holdings | Level 2 | Fair Value, Recurring
Assets:
Total assets	[2]	0	0
Investment in SymetryML Holdings | Level 3 | Fair Value, Recurring
Assets:
Total assets	[2]	$ 636	$ 789
[1] Refe r to Note 15 — Seller's Earn-Out and Note 16 — Warrants included in the Company's Annual Report on Form 10-K for the year ended December 31, 2022, for further i nformation about the initial and subsequent measurement, including significant assumptions and valuation methodologies of these instruments. Refe r to Note 16 — SymetryML and SymetryML Holdings belo w for further information about the initial measurement, including significant assumptions and valuation methodologies of this investment.

Fair Value Measurements - Summa

Fair Value Measurements - Summary of Rollforward of Assets and Liabilities Classified as Level 3 (Details) - Level 3 - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022
Seller's Earn-Out Liability
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning Balance	$ 773	$ 18,081
Additions		0
Measurement adjustments	(750)	(15,664)
Ending Balance	23	2,417
Investment in SymetryML Holdings
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning Balance	789	0
Additions		861
Measurement adjustments	(153)	(49)
Ending Balance	$ 636	$ 812

(Loss) Earnings Per Share - Sch

(Loss) Earnings Per Share - Schedule of Computation of Net Income Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Earnings Per Share [Abstract]
Net (loss) income attributable to AdTheorent Holding Company, Inc.	$ (4,194)	$ 5,725	$ (1,335)	$ 21,762
Weighted-average common shares outstanding - basic	88,175,813	86,492,025	87,869,345	86,003,514
Effect of dilutive equity-based awards	0	5,630,396	0	6,882,337
Weighted-average common shares outstanding - diluted	88,175,813	92,122,421	87,869,345	92,885,851
Basic	$ (0.05)	$ 0.07	$ (0.02)	$ 0.25
Diluted	$ (0.05)	$ 0.06	$ (0.02)	$ 0.23

(Loss) Earnings Per Share - Sum

(Loss) Earnings Per Share - Summary of Outstanding Potentially Dilutive Securities (Details) - shares	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share, shares	36,088,260	27,739,707	36,088,260	26,487,766
Stock Options
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share, shares	6,663,685	1,541,098	6,663,685	565,303
Restricted Stock Units
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share, shares	6,066,092	2,840,126	6,066,092	2,563,980
Public Warrants
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share, shares	10,541,657	10,541,657	10,541,657	10,541,657
Private Placement Warrants
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share, shares	5,432,237	5,432,237	5,432,237	5,432,237
Seller's Earn-Out
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share, shares	6,785,714	6,785,714	6,785,714	6,785,714
Sponsor Earn-Out
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share, shares	598,875	598,875	598,875	598,875

(Loss) Earnings Per Share - S_2

(Loss) Earnings Per Share - Summary of Outstanding Potentially Dilutive Securities (Parenthetical) (Details) - shares	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share, shares	36,088,260	27,739,707	36,088,260	26,487,766
Private Placement Warrants
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share, shares	5,432,237	5,432,237	5,432,237	5,432,237
Warrants Held in Escrow
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share, shares	551,096	551,096	551,096	551,096

Leases - Additional Information

Leases - Additional Information (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2023	Dec. 31, 2022
New York Headquarters Office
Lessee, Lease, Description [Line Items]
Operating lease expiration year	2028
Letters of Credit
Lessee, Lease, Description [Line Items]
Line of credit	$ 983	$ 983

Leases - Schedule of Components

Leases - Schedule of Components of Lease Expense (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Leases [Abstract]
Operating lease cost	$ 246	$ 257	$ 745	$ 729
Short term lease cost	140	49	404	98
Variable lease cost	$ 0	$ 0	$ 0	$ 0

Leases - Summary of Supplementa

Leases - Summary of Supplemental Cash Flow Information Related to Operating Leases (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022
Leases [Abstract]
Operating cash flows used for operating leases	$ 1,116	$ 998
Right-of-use assets obtained in exchange for new operating lease obligations	$ 0	$ 214

Leases - Schedule of Supplement

Leases - Schedule of Supplemental Balance Sheet Information Related to Operating Leases (Details)	Sep. 30, 2023	Dec. 31, 2022
Leases [Abstract]
Weighted average remaining lease term (years)	4 years 10 months 17 days	5 years 7 months 2 days
Weighted average discount rate (%)	3.25%	3.25%

Leases - Summary of Future Mini

Leases - Summary of Future Minimum Lease Payments (Details) $ in Thousands	Sep. 30, 2023 USD ($)
Leases [Abstract]
Remainder of 2023	$ 368
2024	1,441
2025	1,433
2026	1,415
2027	1,364
Thereafter	1,023
Total operating lease payments	7,044
Less: Imputed interest	(526)
Total operating lease liabilities	$ 6,518