Viant Technology (DSP) 10-Q 8 May 23 2023 Q1 Quarterly report Financial data

Cover Page

Cover Page - shares	3 Months Ended
	Mar. 31, 2023	May 04, 2023
Document Information [Line Items]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Mar. 31, 2023
Document Fiscal Year Focus	2023
Document Transition Report	false
Entity File Number	001-40015
Entity Registrant Name	Viant Technology Inc.
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	85-3447553
Entity Address, Address Line One	2722 Michelson Drive
Entity Address, Address Line Two	Suite 100
Entity Address, City or Town	Irvine
Entity Address, State or Province	CA
Entity Address, Postal Zip Code	92612
City Area Code	949
Local Phone Number	861-8888
Title of 12(b) Security	Class A common stock, par value $0.001 per share
Trading Symbol	DSP
Name of each exchange on which registered	NASDAQ
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Non-accelerated Filer
Entity Emerging Growth Company	true
Entity Small Business	true
Entity Ex Transition Period	false
Entity Shell Company	false
Entity Central Index Key	0001828791
Current Fiscal Year End Date	--12-31
Document Fiscal Period Focus	Q1
Amendment Flag	false
Class A Common Stock
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		15,064,581
Class B Common Stock
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		47,082,260

CONDENSED CONSOLIDATED STATEMEN

CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Income Statement [Abstract]
Revenue	$ 41,720	$ 42,629
Operating expenses:
Platform operations	23,337	26,194
Sales and marketing	12,169	13,756
Technology and development	5,894	5,003
General and administrative	11,428	11,083
Total operating expenses	52,828	56,036
Loss from operations	(11,108)	(13,407)
Interest expense (income), net	(1,819)	152
Other expense, net	87	4
Total other expense (income), net	(1,732)	156
Net loss	(9,376)	(13,563)
Less: Net loss attributable to noncontrolling interests	(6,896)	(10,371)
Net loss attributable to Viant Technology Inc.	$ (2,480)	$ (3,192)
Loss per share of Class A common stock:
Basic (USD per share)	$ (0.17)	$ (0.23)
Diluted (USD per share)	$ (0.17)	$ (0.23)
Weighted-average shares of Class A common stock outstanding:
Basic (shares)	14,748,000	13,809,000
Diluted (shares)	14,748,000	13,809,000

CONDENSED CONSOLIDATED BALANCE

CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($)	Mar. 31, 2023	Dec. 31, 2022
Current assets:
Cash and cash equivalents	$ 201,742,000	$ 206,573,000
Accounts receivable, net of allowances	80,810,000	101,658,000
Prepaid expenses and other current assets	3,771,000	6,631,000
Total current assets	286,323,000	314,862,000
Property, equipment, and software, net	24,274,000	23,106,000
Operating lease assets	25,473,000	26,441,000
Intangible assets, net	507,000	667,000
Goodwill	12,422,000	12,422,000
Other assets	64,000	385,000
Total assets	349,063,000	377,883,000
Current liabilities:
Accounts payable	20,782,000	37,063,000
Accrued liabilities	28,580,000	35,063,000
Accrued compensation	6,223,000	9,162,000
Current portion of deferred revenue	1,055,000	123,000
Current portion of operating lease liabilities	3,973,000	3,711,000
Other current liabilities	2,447,000	1,995,000
Total current liabilities	63,060,000	87,117,000
Long-term debt	0	0
Long-term portion of operating lease liabilities	23,990,000	24,998,000
Total liabilities	87,050,000	112,115,000
Commitments and contingencies (Note 13)
Stockholders’ equity
Preferred stock, $0.001 par value	0	0
Additional paid-in capital	100,942,000	95,922,000
Accumulated deficit	(39,425,000)	(36,261,000)
Treasury stock, at cost; 379,497 and 140,088 shares held	(1,567,000)	(475,000)
Total stockholders’ equity attributable to Viant Technology Inc.	60,012,000	59,248,000
Noncontrolling interests	202,001,000	206,520,000
Total equity	262,013,000	265,768,000
Total liabilities and stockholders’ equity	349,063,000	377,883,000
Class A Common Stock
Stockholders’ equity
Common stock	15,000	15,000
Class B Common Stock
Stockholders’ equity
Common stock	$ 47,000	$ 47,000

CONDENSED CONSOLIDATED BALANC_2

CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - $ / shares	Mar. 31, 2023	Dec. 31, 2022
Preferred stock, par value (USD per share)	$ 0.001	$ 0.001
Preferred stock, shares outstanding (shares)	0	0
Preferred stock, shares issued (shares)	0	0
Treasury stock, shares (shares)	379,497	140,088
Class A Common Stock
Common stock, par value (USD per share)	$ 0.001	$ 0.001
Common stock, shares authorized (shares)	450,000,000	450,000,000
Common stock, shares issued (shares)	15,444,078	14,783,886
Common stock, shares outstanding (shares)	15,064,581	14,643,798
Class B Common Stock
Common stock, par value (USD per share)	$ 0.001	$ 0.001
Common stock, shares authorized (shares)	150,000,000	150,000,000
Common stock, shares issued (shares)	47,082,260	47,082,260
Common stock, shares outstanding (shares)	47,082,260	47,082,260

CONDENSED CONSOLIDATED STATEM_2

CONDENSED CONSOLIDATED STATEMENTS OF EQUITY - USD ($) $ in Thousands	Total	Cumulative Effect, Period of Adoption, Adjustment	Cumulative Effect, Period of Adoption, Adjusted Balance	Common Stock Class A Common Stock	Common Stock Class A Common Stock Cumulative Effect, Period of Adoption, Adjusted Balance	Common Stock Class B Common Stock	Common Stock Class B Common Stock Cumulative Effect, Period of Adoption, Adjusted Balance	Additional Paid-In Capital	Additional Paid-In Capital Cumulative Effect, Period of Adoption, Adjusted Balance	Accumulated Deficit	Accumulated Deficit Cumulative Effect, Period of Adoption, Adjustment	Accumulated Deficit Cumulative Effect, Period of Adoption, Adjusted Balance	Treasury Stock	Treasury Stock Cumulative Effect, Period of Adoption, Adjusted Balance	Noncontrolling Interests	Noncontrolling Interests Cumulative Effect, Period of Adoption, Adjusted Balance
Beginning balance (shares) at Dec. 31, 2021				13,921,000		47,107,000
Beginning balance at Dec. 31, 2021	$ 282,574			$ 14		$ 47		$ 82,888		$ (20,139)			$ (2,648)		$ 222,412
Beginning balance, treasury stock (shares) at Dec. 31, 2021													(216,000)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Exchange of Class B common stock for Class A common stock (shares)				25,000		(25,000)
Issuance of Class A common stock in connection with equity-based compensation plans (shares)				126,000
Reissuance of treasury stock in connection with equity-based compensation plans (shares)													216,000
Reissuance of treasury stock in connection with equity-based compensation plans	0									(2,648)			$ 2,648
Allocation of equity to noncontrolling interests								(4,276)							4,276
Accrued member tax distributions	(12)							(12)
Stock-based compensation	7,326							7,326
Net loss	(13,563)									(3,192)					(10,371)
Ending balance (shares) at Mar. 31, 2022				14,072,000		47,082,000
Ending balance at Mar. 31, 2022	276,325			$ 14		$ 47		85,926		(25,979)			$ 0		216,317
Ending balance, treasury stock (shares) at Mar. 31, 2022													0
Beginning balance (shares) at Dec. 31, 2022				14,784,000	14,784,000	47,082,000	47,082,000
Beginning balance at Dec. 31, 2022	$ 265,768	$ (209)	$ 265,559	$ 15	$ 15	$ 47	$ 47	95,922	$ 95,922	(36,261)	$ (209)	$ (36,470)	$ (475)	$ (475)	206,520	$ 206,520
Beginning balance, treasury stock (shares) at Dec. 31, 2022	140,088												(140,000)	(140,000)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of Class A common stock in connection with equity-based compensation plans (shares)				660,000
Issuance of Class A common stock in connection with equity-based compensation plans	$ 0			$ 1				(1)
Repurchase of treasury shares in connection with the taxes paid related to net share settlement of equity awards (shares)													(379,000)
Repurchase of treasury shares in connection with the taxes paid related to net share settlement of equity awards	(1,567)												$ (1,567)
Reissuance of treasury stock in connection with equity-based compensation plans (shares)													140,000
Reissuance of treasury stock in connection with equity-based compensation plans	0									(475)			$ 475
Allocation of equity to noncontrolling interests								(2,377)							2,377
Accrued member tax distributions	(1,474)							(1,474)
Stock-based compensation	8,872							8,872
Net loss	(9,376)									(2,480)					(6,896)
Ending balance (shares) at Mar. 31, 2023				15,444,000		47,082,000
Ending balance at Mar. 31, 2023	$ 262,013			$ 15		$ 47		$ 100,942		$ (39,425)			$ (1,567)		$ 202,001
Ending balance, treasury stock (shares) at Mar. 31, 2023	379,497												(379,000)

CONDENSED CONSOLIDATED STATEM_3

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Cash flows from operating activities:
Net loss	$ (9,376)	$ (13,563)
Adjustments to reconcile net loss to net cash provided by (used in) operating activities:
Depreciation and amortization	3,412	3,154
Stock-based compensation	7,472	6,376
Provision for (recovery of) doubtful accounts	22	51
Loss on disposal of assets	104	0
Amortization of operating lease assets	968	654
Changes in operating assets and liabilities:
Accounts receivable	20,618	30,790
Prepaid expenses and other assets	3,180	(568)
Accounts payable	(16,301)	(8,157)
Accrued liabilities	(6,504)	3,584
Accrued compensation	(3,350)	(2,721)
Deferred revenue	933	(6,486)
Operating lease liabilities	(743)	(461)
Other liabilities	(1,000)	(1,083)
Net cash provided by (used in) operating activities	(565)	11,570
Cash flows from investing activities:
Purchases of property and equipment	(291)	(373)
Capitalized software development costs	(2,382)	(1,725)
Net cash used in investing activities	(2,673)	(2,098)
Cash flows from financing activities:
Taxes paid related to net share settlement of equity awards	(1,567)	0
Payment of member tax distributions	(26)	(16)
Net cash used in financing activities	(1,593)	(16)
Net increase (decrease) in cash and cash equivalents	(4,831)	9,456
Cash and cash equivalents at beginning of period	206,573	238,480
Cash and cash equivalents at end of period	201,742	247,936
Supplemental disclosure of cash flow information:
Cash paid for interest	38	104
Supplemental disclosure of non-cash investing and financing activities:
Stock-based compensation included in capitalized software development costs	1,400	950
Capitalized assets financed by accounts payable and accrued liabilities	953	464
Accrued member tax distributions	$ 1,450	$ 0

Nature of Operations

Nature of Operations	3 Months Ended
	Mar. 31, 2023
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Nature of Operations	Nature of Operations Viant Technology Inc. (the “Company,” “we,” “us,” “our” or “Viant”) was incorporated in the State of Delaware on October 9, 2020 . The Company operates a demand side platform, Adelphic, that is used by marketers and their advertising agencies to centralize the planning, buying and measurement of their advertising across most channels, including desktop, mobile, connected TV, linear TV, in-game, streaming audio and digital billboards. On February 9, 2021, the Securities and Exchange Commission (“SEC”) declared effective the Company’s Form S-1 related to the initial public offering (“IPO”) of its Class A common stock. The closing date of the IPO was February 12, 2021, and in connection with the closing and the corporate reorganization (the “Reorganization Transactions”), the following actions were taken: • The Company amended and restated its certificate of incorporation, under which the Company is authorized to issue up to 450,000,000 shares of Class A common stock, up to 150,000,000 shares of Class B common stock, and up to 10,000,000 shares of preferred stock; • The limited liability company agreement of Viant Technology LLC was amended and restated (as amended and restated, the “Viant Technology LLC Agreement”) to, among other things, provide for Class A units and Class B units and appoint the Company as the sole managing member of Viant Technology LLC; • The Viant Technology LLC Agreement classified the interests acquired by the Company as Class A units, reclassified the interests held by the continuing members of Viant Technology LLC as Class B units, and permits the continuing members of Viant Technology LLC to exchange Class B units for shares of Class A common stock of Viant Technology Inc. on a one-for-one basis or, at the election of Viant Technology Inc., for cash at the current fair value on the date of the exchange. Immediately following such reclassification, the continuing members held 48,935,559 Class B units. For each membership unit of Viant Technology LLC that was reclassified as a Class B unit, the Company issued one corresponding share of our Class B common stock to the continuing members, or 48,935,559 shares of Class B common stock in total; • The Company issued and sold 10,000,000 shares of its Class A common stock to the underwriters at an IPO price of $25.00 per share, for gross proceeds of $250.0 million before deducting underwriting discounts and commissions of $17.5 million; • The Company used the net proceeds of $232.5 million to acquire 10,000,000 newly issued Class A units of Viant Technology LLC at a per-unit price equal to the per-share price paid by the underwriters for shares of our Class A common stock; • The underwriters exercised their option to purchase 1,500,000 additional shares of Class A common stock from the selling stockholders in the IPO. The Company did not receive any proceeds from the sale of shares by the selling stockholders. Pursuant to such exercise, the selling stockholders exchanged the corresponding number of Class B units for the shares of Class A common stock, the corresponding number of shares of Class B common stock were automatically retired, and 1,500,000 Class A units were issued to the Company; • The Class B stockholders and Class A stockholders initially had 80.5% and 19.5%, respectively, of the combined voting power of the Company’s common stock. The Class A common stock outstanding represents 100% of the rights of the holders of all classes of the Company’s outstanding common stock to share in distributions from the Company, except for the right of Class B stockholders to receive the par value of the Class B common stock upon our liquidation, dissolution or winding up or an exchange of Class B units; • The Company entered into a Registration Rights Agreement with the Class B stockholders to provide for certain rights and restrictions after the IPO; and • Viant Technology LLC’s 2020 Equity Based Incentive Compensation Plan (the “Phantom Unit Plan”) was terminated and replaced with the Company’s 2021 Long Term Incentive Plan (the “LTIP”). Immediately following the closing of the IPO, Viant Technology LLC became the predecessor of the Company for financial reporting purposes. Viant Technology Inc. is a holding company, and its sole material asset is its equity interest in Viant Technology LLC. As the sole managing member of Viant Technology LLC, the Company operates and controls all of the business and affairs of Viant Technology LLC. The Reorganization Transactions are accounted for as a reorganization of entities under common control. As a result, the condensed consolidated financial statements of the Company recognize the assets and liabilities received in the Reorganization Transactions at their historical carrying amounts, as reflected in the historical consolidated financial statements of Viant Technology LLC. The Company consolidates Viant Technology LLC in its condensed consolidated financial statements and records a noncontrolling interest related to the Class B units held by the Class B stockholders on its condensed consolidated balance sheets and statements of operations.

Basis of Presentation and Summa

Basis of Presentation and Summary of Significant Accounting Policies	3 Months Ended
	Mar. 31, 2023
Basis Of Presentation And Summary Of Significant Accounting Policies [Abstract]
Basis of Presentation and Summary of Significant Accounting Policies	Basis of Presentation and Summary of Significant Accounting Policies Basis of Presentation and Principles of Consolidation The accompanying unaudited condensed consolidated financial statements are prepared in accordance with accounting principles generally accepted in the United States of America (“GAAP”) for interim financial information which are unaudited and include the operations of the Company, Viant Technology LLC and its wholly owned subsidiaries. Viant Technology LLC is considered a variable interest entity. The Company is the primary beneficiary and sole managing member of Viant Technology LLC and has decision making authority that significantly affects the economic performance of the entity. As a result, the Company consolidates Viant Technology LLC. All intercompany balances and transactions have been eliminated in consolidation. Management believes that the accompanying condensed consolidated financial statements reflect the adjustments necessary for the fair statement of its condensed consolidated balance sheets, statements of operations, and cash flows included in this report. The condensed consolidated balance sheet as of December 31, 2022 was derived from the audited annual financial statements but does not contain all of the footnote disclosures from the annual financial statements. Certain information and disclosures normally included in the Company's consolidated financial statements prepared in accordance with GAAP have been omitted. Accordingly, these condensed consolidated financial statements should be read in conjunction with the Company’s audited consolidated financial statements and related notes included in its Annual Report on Form 10-K for the year ended December 31, 2022. The condensed consolidated statements of operations for the three months ended March 31, 2023 are not necessarily indicative of the results to be expected for the year ending December 31, 2023 (“fiscal 2023”), or for any other future annual or interim period. There have been no material changes to our significant accounting policies as described in our Annual Report on Form 10-K for the year ended December 31, 2022. Use of Estimates The preparation of our condensed consolidated financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosures of contingent assets and liabilities at the date of the condensed consolidated financial statements and the reported amounts of revenue and expenses during the reporting period. On an ongoing basis, management evaluates its estimates, primarily those related to revenue recognition, stock-based compensation, income taxes, allowances for doubtful accounts, the useful lives of capitalized software development costs and other property, equipment and software and assumptions used in the impairment analyses of long-lived assets and goodwill. These estimates are based on historical data and experience, as well as various other factors that management believes to be reasonable under the circumstances, the results of which form the basis for making judgments about the carrying amount of assets and liabilities that are not readily apparent from other sources. Actual results may differ from these estimates under different assumptions or conditions. As of March 31, 2023, the impact of widespread macroeconomic and geopolitical uncertainties, including the continuing impact of COVID-19, bank failures, labor shortages, inflation and monetary supply shifts, rising interest rates, tightening of credit markets, recession risks, and potential disruptions from the Russia-Ukraine conflict, on our business continues to evolve. As a result, many of our estimates and assumptions consider macroeconomic and geopolitical factors in the market, which require increased judgment and carry a higher degree of variability and volatility. As events continue to evolve and additional information becomes available on the potential impact on our business of global economic and business events, our estimates may change materially in future periods. Comprehensive Loss For the periods presented, net loss is equal to comprehensive loss. Accounts Receivable, Net of Allowances The following table presents changes in the allowance for doubtful accounts for the three months ended March 31, 2023: (in thousands) Balance as of December 31, 2022 $ 1,015 Cumulative impact of accounting adoption 209 Provision for doubtful accounts 22 Write-offs, net of recoveries (84) Balance as of March 31, 2023 $ 1,162 Concentration of Risk Financial instruments that potentially subject the Company to concentration of risk consist principally of cash and accounts receivable. The Company maintains its cash with financial institutions and its cash levels exceed the Federal Deposit Insurance Corporation’s federally insured limits. Accounts receivable include amounts due from customers with principal operations primarily in the United States. As of March 31, 2023, one individual customer accounted for 10.3% of consolidated accounts receivable. As of December 31, 2022, no individual customers accounted for 10.0% or greater of consolidated accounts receivable. As of March 31, 2023, two individual suppliers accounted for 15.7% and 10.6% of consolidated accounts payable and accrued liabilities. As of December 31, 2022, one supplier accounted for 24.6% of consolidated accounts payable and accrued liabilities. For the three months ended March 31, 2023, one advertising agency holding company accounted for 11.5% of the Company's total revenue. For the three months ended March 31, 2022, no advertising agency holding company accounted for 10.0% or more of the Company's total revenue. For the three months ended March 31, 2023 and 2022, there were no individual customers that accounted for 10.0% or more of the Company’s total revenues. JOBS Act Election as an Emerging Growth Company On April 5, 2012, the Jumpstart Our Business Startups Act (the “JOBS Act”) was signed into law. The JOBS Act contains provisions that, among other things, reduce certain reporting requirements for qualifying public companies. As an “emerging growth company,” the Company may, under Section 7(a)(2)(B) of the Securities Act of 1933, as amended (the “Securities Act”), delay adoption of new or revised accounting standards applicable to public companies until such standards would otherwise apply to private companies. An “emerging growth company” is one with less than $1.235 billion in annual sales, has less than $700 million in market value of its shares of common stock held by non-affiliates and issues less than $1 billion of non-convertible debt over a three-year period. The Company may take advantage of this extended transition period until the first to occur of the date that it (i) is no longer an “emerging growth company” or (ii) affirmatively and irrevocably opts out of this extended transition period. The Company has elected to take advantage of the benefits of this extended transition period. Until the date that the Company is no longer an “emerging growth company” or affirmatively and irrevocably opts out of the exemption provided by Securities Act Section 7(a)(2)(B), upon issuance of a new or revised accounting standard that applies to its condensed consolidated financial statements and that has a different effective date for public and private companies, the Company will disclose the date on which it will adopt the recently issued accounting standard. Recently Adopted Accounting Pronouncements Financial Instruments—Credit Losses In June 2016, the Financial Accounting Standards Board issued Accounting Standards Update ("ASU") No. 2016-13, Financial Instruments—Credit Losses (Topic 326) . ASU 2016-13 revises the impairment model to utilize an expected loss methodology in place of the currently used incurred loss methodology, which results in more timely recognition of losses on financial instruments. We adopted this standard at the beginning of fiscal 2023. As a result, we revised the impairment model to utilize an expected loss methodology in place of an incurred loss methodology related to our allowance for credit losses on our trade accounts receivable. We

Revenue

Revenue	3 Months Ended
	Mar. 31, 2023
Revenue from Contract with Customer [Abstract]
Revenue	Revenue The disaggregation of revenue was as follows: Three Months Ended 2023 2022 Over-time revenue $ 386 $ 137 Point-in-time revenue 41,334 42,492 Total revenue $ 41,720 $ 42,629 Revenue for unsatisfied performance obligations expected to be recognized in the future for contracts with an original expected duration of greater than one year was $1.1 million as of March 31, 2023 and $0.1 million as of December 31, 2022. These amounts do not include contracts with an original expected duration of less than one year, which is the majority of the Company’s contracts. Remaining deferred revenue that is anticipated to be recognized during the succeeding twelve month period is recorded in the current portion of deferred revenue within the condensed consolidated balance sheets.

Property, Equipment and Softwar

Property, Equipment and Software, Net	3 Months Ended
	Mar. 31, 2023
Property, Plant and Equipment [Abstract]
Property, Equipment and Software, Net	Property, Equipment, and Software, Net Major classes of property, equipment, and software were as follows: As of As of December 31, 2023 2022 Capitalized software development costs $ 77,156 $ 72,988 Computer equipment 1,124 1,116 Purchased software 32 32 Furniture, fixtures and office equipment 957 1,226 Leasehold improvements 2,040 2,571 Total property, equipment and software 81,309 77,933 Less: Accumulated depreciation (57,035) (54,827) Total property, equipment and software, net $ 24,274 $ 23,106 Depreciation recorded in the condensed consolidated statements of operations was as follows: Three Months Ended 2023 2022 Platform operations $ 2,712 $ 2,136 Sales and marketing — — Technology and development 393 595 General and administrative 147 136 Total $ 3,252 $ 2,867 For the three months ended March 31, 2023 and 2022, total interest cost incurred was $0.1 million and $0.2 million, respectively. Interest costs capitalized during the three months ended March 31, 2023 and 2022 were de minimis.

Leases

Leases	3 Months Ended
	Mar. 31, 2023
Leases [Abstract]
Leases	Leases Lessee Arrangements The Company has operating leases for its office space, which have remaining lease terms of up to eight years. The Company does not have finance leases. Some of our leases include renewal options to extend the leases for up to five years and/or termination options to terminate the leases within one year. If it is reasonably certain that a renewal or termination option will be exercised, the exercise of the option is considered in calculating the term of the lease. The Company did not enter into any leases during the three months ended March 31, 2023. As of March 31, 2023, our operating leases had a weighted-average remaining lease term of approximately seven years and a weighted-average incremental borrowing rate of 3.5%. Cash paid for amounts included in the operating lease liabilities was $1.0 million and $0.6 million for the three months ended March 31, 2023 and 2022, respectively. The components of lease expense were as follows (in thousands): Three Months Ended March 31, 2023 2022 Operating lease cost $ 1,209 $ 812 Short-term lease cost 260 343 Variable lease cost 21 97 Total lease cost $ 1,490 $ 1,252 Future minimum lease payments as of March 31, 2023 were as follows: As of Year 2023 Remainder of 2023 $ 3,659 2024 4,385 2025 4,270 2026 4,257 2027 4,182 Thereafter 10,811 Total undiscounted future lease payments 31,564 Less: Imputed interest (3,601) Present value of operating lease liabilities 27,963 Less: Operating lease liabilities, current (3,973) Operating lease liabilities, noncurrent $ 23,990

Intangible Assets, Net

Intangible Assets, Net	3 Months Ended
	Mar. 31, 2023
Goodwill and Intangible Assets Disclosure [Abstract]
Intangible Assets, Net	Intangible Assets, Net The balances of intangible assets and accumulated amortization are as follows: As of March 31, 2023 Remaining Weighted-Average Useful Gross Amount Accumulated Net Carrying Amount Developed technology — $ 4,927 $ (4,927) $ — Customer relationships 0.8 2,300 (2,026) 274 Trademarks/tradenames 2.9 1,400 (1,167) 233 Total $ 8,627 $ (8,120) $ 507 As of December 31, 2022 Remaining Weighted- Average Useful Gross Amount Accumulated Net Carrying Amount Developed technology 0.1 $ 4,927 $ (4,869) $ 58 Customer relationships 1.1 2,300 (1,944) 356 Trademarks/tradenames 3.2 1,400 (1,147) 253 Total $ 8,627 $ (7,960) $ 667 Amortization of intangible assets recorded in the condensed consolidated statements of operations was as follows: Three Months Ended 2023 2022 Platform operations $ 58 $ 175 Sales and marketing — — Technology and development — — General and administrative 102 112 Total $ 160 $ 287 Estimated future amortization of intangible assets is as follows: As of March 31, Year 2023 Remainder of 2023 $ 306 2024 107 2025 80 2026 14 2027 — Thereafter — Total $ 507

Accrued Liabilities

Accrued Liabilities	3 Months Ended
	Mar. 31, 2023
Payables and Accruals [Abstract]
Accrued Liabilities	Accrued Liabilities The Company’s accrued liabilities consisted of the following: As of As of December 31, 2023 2022 Accrued traffic acquisition costs $ 25,188 $ 29,631 Other accrued liabilities 3,392 5,432 Total accrued liabilities $ 28,580 $ 35,063 The Company had a balance of $0.2 million and $0.2 million as of March 31, 2023 and December 31, 2022, respectively, payable to related parties for expenses they incurred on our behalf, which was recorded within accrued liabilities on the condensed consolidated balance sheets. The related expense incurred by the Company was $0.2 million for the three months ended March 31, 2023 and de minimis for the three months ended March 31, 2022.

Revolving Credit Facility

Revolving Credit Facility	3 Months Ended
	Mar. 31, 2023
Debt Disclosure [Abstract]
Revolving Credit Facility	Revolving Credit Facility Revolving Credit Facility On October 31, 2019, we entere d into an asset-based revolving credit and security agreement (the “Loan Agreement”) with PNC Bank, National Association (“PNC Bank”). The Loan Agreement prov ides a senior secured revolving credit facility of up to $40.0 million with a maturity date of October 31, 2024. The Loan Agreement is collateralized by security interests in substantially all of our assets. Advances under the Loan Agreement bear interest through maturity at a variable rate based upon our selection of either a Domestic Rate or a LIBOR Rate, plus an applicable margin (“Domestic Rate Loans” and “LIBOR Rate Loans”). The Domestic Rate is defined as a fluctuating interest rate equal to the greater of (1) the base commercial lending rate of PNC Bank, (2) the overnight federal funds rate plus 0.50% and (3) the Daily LIBOR Rate plus 1.00%. The Company did not have an outstanding balance during the three months ended March 31, 2023. The applicable margin is between 0.75% to 1.25% for Domestic Rate Loans and between 1.75% and 2.25% for LIBOR Rate Loans based on maintaining certain undrawn availability ratios. The applicable margin as of March 31, 2023 was equal to 0.75% for Domestic Rate Loans and 1.75% for LIBOR Rate Loans. The facility fee for undrawn amounts under the Loan Agreement is 0.375% per annum. We will be required to pay customary letter of credit fees, as necessary. Refer to Note 5 — Leases for additional information. The Loan Agreement contains customary conditions to borrowings, events of default and covenants, including covenants that restrict our ability to sell assets, make changes to the nature of the business, engage in mergers or acquisitions, incur, assume or permit to exist additional indebtedness and guarantees, create or permit to exist liens, pay dividends, issue equity instruments, make distributions or redeem or repurchase capital stock or make other investments, and engage in transactions with affiliates. The Loan Agreement also requires that we maintain compliance with a minimum Fixed Charge Coverage Ratio (as defined in the Loan Agreement) of 1.40 to 1.00 at any time undrawn availability under the Loan Agreement is less than 25%. As of March 31, 2023, we were in compliance with all covenants. On April 4, 2023, we entered into an amendment to the Loan Agreement with PNC Bank (the "Amended Loan Agreement") that provides for an increase in the revolving credit facility, extends the maturity date, and changes the rates at which advances under the Amended Loan Agreement will bear interest. Refer to Note 14 — Subsequent Events, for additional information.

Stock-Based Compensation

Stock-Based Compensation	3 Months Ended
	Mar. 31, 2023
Share-Based Payment Arrangement [Abstract]
Stock-Based Compensation	Stock-Based Compensation In connection with the IPO, which occurred on February 12, 2021, the Phantom Unit Plan was replaced by the LTIP. On February 12, 2021, 6.2 million restricted stock units (“RSUs”) were granted under the LTIP. The Company is authorized to grant RSUs, incentive stock options, nonqualified stock options, stock appreciation rights, restricted stock awards, and performance stock awards under its LTIP. As of March 31, 2023 , the Company had only granted RSUs and nonqualified stock options under the LTIP. Under the LTIP, 4.5 million shares of Class A common stock remained available for grant as of March 31, 2023 . Stock-based compensation recorded in the condensed consolidated statements of operations was as follows: Three Months Ended 2023 2022 Platform operations $ 892 $ 1,086 Sales and marketing 2,512 2,179 Technology and development 1,327 1,169 General and administrative 2,741 1,942 Total $ 7,472 $ 6,376 RSUs The following summarizes RSU activity: Number of Shares Weighted-Average RSUs outstanding as of December 31, 2022 3,928 $ 12.59 Granted 1,406 4.41 Vested (800) 13.38 Canceled/forfeited (38) 7.02 RSUs outstanding as of March 31, 2023 4,496 9.94 As of March 31, 2023, the Company had unrecognized stock-based compensation relating to RSUs of approximately $39.1 million, which is expected to be recognized over a weighted-average period of 2.2 years. Nonqualified Stock Options The following summarizes nonqualified stock option activity: Number of Options Weighted-Average Weighted-Average Aggregate Intrinsic Value Outstanding as of December 31, 2022 3,661 $ 6.14 9.2 $ — Granted 2,127 4.43 Exercised — — Canceled (8) 10.35 Expired (25) 22.65 Outstanding as of March 31, 2023 5,755 5.43 9.3 33 Vested and exercisable 802 6.22 8.9 — The weighted-average grant date fair value of the nonqualified stock options granted during the three months ended March 31, 2023 was $2.99. The Company had unrecognized stock-based compensation relating to unvested nonqualified stock options of approximately $16.0 million, which is expected to be recognized over a weighted-average period of 2.6 years, as of March 31, 2023. The following table presents the assumptions used in the Black-Scholes model to determine the fair value of nonqualified stock options for the three months ended March 31, 2023 and 2022. Three Months Ended 2023 2022 Risk free interest rate 4.3% 1.4% Expected volatility 81.5% 61.5% Expected term (in years) 6.0 5.9 Expected dividend yield 0.0% 0.0% Risk-Free Interest Rate. The Company bases the risk-free interest rate assumption for equity awards on the rates for U.S. Treasury securities with maturities similar to those of the expected term of the award being valued. Expected Volatility. Due to the limited trading history of the Company’s Class A common stock, the expected volatility assumption is based on volatilities of a peer group of similar companies whose share prices are publicly available. The Company will continue to apply this process until a sufficient amount of historical information regarding the volatility of the Company’s own stock price becomes available. Expected Term. Given the insufficient historical data relating to nonqualified stock option exercises, the expected term assumption is based on expected terms of a peer group of similar companies whose expected terms are publicly available. The Company will continue to apply this process until a sufficient amount of historical information regarding the Company’s nonqualified stock option exercises becomes available. Expected Dividend Yield. The Company’s expected dividend yield assumption is zero as it has never paid dividends and has no present intention to do so in the future. Issuance of Shares Upon vesting of shares under the LTIP, we will issue treasury stock. If treasury stock is not available, Class A common stock will be issued.

Income Taxes and Tax Receivable

Income Taxes and Tax Receivable Agreement	3 Months Ended
	Mar. 31, 2023
Income Tax Disclosure [Abstract]
Income Taxes and Tax Receivable Agreement	Income Taxes and Tax Receivable Agreement The provision for income taxes differs from the amount of income tax computed by applying the applicable U.S. statutory federal income tax rate of 21% to income before provision of income taxes due to Viant Technology LLC’s pass-through structure for U.S. income tax purposes and the valuation allowance against the deferred tax asset in the current and prior-year periods. The Company did not recognize an income tax benefit (expense) on its share of pre-tax book income (loss), exclusive of the noncontrolling interest of 75.8% due to the full valuation allowance against its deferred tax assets, resulting in an effective tax rate of 0.0% for each of the three months ended March 31, 2023 and 2022. As of March 31, 2023, management determined based on applicable accounting standards and the weight of all available evidence, it was not more likely than not (“MLTN”) that the Company will generate sufficient taxable income to realize our deferred tax assets including the difference in our tax basis in excess of the financial reporting value for our investment in Viant Technology LLC. Consequently, we have established a full valuation allowance against our deferred tax assets as of March 31, 2023. In the event that management subsequently determines that it is MLTN that we will realize our deferred tax assets in the future over the recorded amount, a decrease to the valuation allowance will be made, which will reduce the provision for income taxes. The Company has concluded based on applicable accounting standards and the weight of all available evidence, that it was MLTN that its deferred tax assets subject to the Tax Receivable Agreement entered into with Viant Technology LLC, continuing members of Viant Technology LLC and the TRA Representative (as defined in the TRA) on February 9, 2021 (“TRA”) would not be realized as of March 31, 2023. Therefore, the Company has not recorded a liability related to the remaining tax savings it may realize from utilization of such deferred tax assets after concluding it was not probable that such TRA liability would be paid based on its estimates of future taxable income. As of the March 31, 2023, the total unrecorded TRA liability is approximately $10.3 million. If utilization of the deferred tax assets subject to the TRA becomes MLTN in the future, the Company will record a liability related to the TRA, to the extent probable at that time, which will be recognized as an expense within its condensed consolidated statements of operations.

Loss Per Share

Loss Per Share	3 Months Ended
	Mar. 31, 2023
Earnings Per Share [Abstract]
Loss Per Share	Loss Per Share For the three months ended March 31, 2023 and 2022 , basic net loss per share has been calculated by dividing net loss attributable to Class A common stockholders by the weighted-average number of shares of Class A common stock outstanding for the same period. Shares of Class A common stock are weighted for the portion of the period in which the shares were outstanding. Diluted net loss per share has been calculated in a manner consistent with that of basic net loss per share while considering all potentially dilutive shares of Class A common stock outstanding during the period. The following table presents the calculation of basic and diluted net loss per share for the three months ended March 31, 2023 and 2022 : Three Months Ended 2023 2022 Numerator Net loss $ (9,376) $ (13,563) Less: Net loss attributable to noncontrolling interests (6,896) (10,371) Net loss attributable to Viant Technology Inc. $ (2,480) $ (3,192) Denominator Weighted-average shares of Class A common stock outstanding—basic and diluted 14,748 13,809 Loss per share of Class A common stock—basic $ (0.17) $ (0.23) Loss per share of Class A common stock—diluted $ (0.17) $ (0.23) Anti-dilutive shares excluded from loss per share of Class A common stock—diluted: Restricted stock units 4,496 4,858 Nonqualified stock options 5,755 3771 Shares of Class B common stock 47,082 47,082 Total shares excluded from loss per share of Class A common stock—diluted 57,333 55,711

Noncontrolling Interests

Noncontrolling Interests	3 Months Ended
	Mar. 31, 2023
Noncontrolling Interest [Abstract]
Noncontrolling Interests	Noncontrolling Interests Viant Technology Inc. is the sole managing member of Viant Technology LLC and, as a result, consolidates the financial results of Viant Technology LLC. We report noncontrolling interests representing the economic interests in Viant Technology LLC held by the other members of Viant Technology LLC. The Viant Technology LLC Agreement classifies the interests acquired by the Company as Class A units, reclassified the interests held by the continuing members of Viant Technology LLC as Class B units and permits the continuing members of Viant Technology LLC to exchange Class B units for shares of Class A common stock on a one-for-one basis or, at the election of Viant Technology Inc., for cash at the current fair value on the date of the exchange. Changes in the Company’s ownership interest in Viant Technology LLC while retaining control of Viant Technology LLC will be accounted for as equity transactions. As such, future redemptions or direct exchanges of Class B units in Viant Technology LLC by the other members and future issuances of Class A common stock under the LTIP will result in a change in ownership, where the Company will rebalance the noncontrolling interest, offset by a change in additional-paid-in-capital. The following table summarizes the ownership of Viant Technology LLC: As of March 31, 2023 As of December 31, 2022 Owner Units Owned Ownership Percentage Units Owned Ownership Percentage Viant Technology Inc. 15,064,581 24.2 % 14,643,798 23.7 % Noncontrolling interests 47,082,260 75.8 % 47,082,260 76.3 % Total 62,146,841 100.0 % 61,726,058 100.0 % There were no exchanges of Class B units of Viant Technology LLC for shares of the Company’s Class A common stock during the three months ended March 31, 2023. The following table presents the effect of changes in the Company’s ownership interest in Viant Technology LLC on the Company’s equity for the periods indicated: Three Months Ended 2023 2022 Net loss attributable to Viant Technology Inc. $ (2,480) $ (3,192) Transfers to noncontrolling interests: Decrease in the additional-paid-in-capital of Viant Technology Inc. resulting from ownership changes in Viant Technology LLC (2,377) (4,276) Change from net loss attributable to Viant Technology Inc. and transfers to noncontrolling interests $ (4,857) $ (7,468)

Commitments and Contingencies

Commitments and Contingencies	3 Months Ended
	Mar. 31, 2023
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Commitments and Contingencies Lease Commitments As of March 31, 2023, the Company had non-cancelable operating lease commitments for office space that have been recorded as operating lease liabilities. Refer to Note 5—Leases for additional information regarding lease commitments. Hosting Commitments As of March 31, 2023, the Company had non-cancelable contractual agreements related to the hosting of our data storage processing, storage, and other computing services. As of March 31, 2023, we estimate these obligations to be approximately $8.8 million for the remainder of 2023, $6.1 million in 2024, $5.0 million in 2025, and $0.8 million in 2026. Legal Matters From time to time, the Company is subject to various legal proceedings and claims, either asserted or unasserted, that arise in the ordinary course of business. Although the outcome of the various legal proceedings and claims cannot be predicted with certainty, management does not believe that any of these proceedings or other claims will have a material effect on the Company’s business, financial condition, results of operations or cash flows. Guarantees and Indemnities The Company has made no significant contractual guarantees for the benefit of third parties. However, in the ordinary course of business, the Company may provide indemnifications of varying scope and terms to customers, vendors, lessors, business partners and other parties with respect to certain matters, including, but not limited to, losses arising out of breach of such agreements, services to be provided by the Company or from intellectual property infringement claims made by third parties. In addition, the Company has entered into indemnification agreements with directors and certain officers and employees that will require the Company, among other things, to indemnify them against certain liabilities that may arise by reason of their status or service as directors, officers or employees. The Company is not aware of indemnification claims that could have a material effect on the Company’s condensed consolidated financial statements. Accordingly, no amounts for any obligation have been recorded as of March 31, 2023.

Subsequent Events

Subsequent Events	3 Months Ended
	Mar. 31, 2023
Subsequent Events [Abstract]
Subsequent Events	Subsequent Events On April 4, 2023, we entered into the Amended Loan Agreement. The Amended Loan Agreement provides for an increase in the revolving credit facility to $75.0 million, extends the maturity date to April 4, 2028, and changes the rates at which advances will bear interest. Advances under the Amended Loan Agreement will bear interest at term SOFR plus 2.00% to 2.25% based on the average undrawn availability. The Company has no outstanding balances under the Amended Loan Agreement.

Basis of Presentation and Sum_2

Basis of Presentation and Summary of Significant Accounting Policies (Policies)	3 Months Ended
	Mar. 31, 2023
Basis Of Presentation And Summary Of Significant Accounting Policies [Abstract]
Basis of Presentation and Principles of Consolidation	Basis of Presentation and Principles of Consolidation The accompanying unaudited condensed consolidated financial statements are prepared in accordance with accounting principles generally accepted in the United States of America (“GAAP”) for interim financial information which are unaudited and include the operations of the Company, Viant Technology LLC and its wholly owned subsidiaries. Viant Technology LLC is considered a variable interest entity. The Company is the primary beneficiary and sole managing member of Viant Technology LLC and has decision making authority that significantly affects the economic performance of the entity. As a result, the Company consolidates Viant Technology LLC. All intercompany balances and transactions have been eliminated in consolidation. Management believes that the accompanying condensed consolidated financial statements reflect the adjustments necessary for the fair statement of its condensed consolidated balance sheets, statements of operations, and cash flows included in this report. The condensed consolidated balance sheet as of December 31, 2022 was derived from the audited annual financial statements but does not contain all of the footnote disclosures from the annual financial statements. Certain information and disclosures normally included in the Company's consolidated financial statements prepared in accordance with GAAP have been omitted. Accordingly, these condensed consolidated financial statements should be read in conjunction with the Company’s audited consolidated financial statements and related notes included in its Annual Report on Form 10-K for the year ended December 31, 2022. The condensed consolidated statements of operations for the three months ended March 31, 2023 are not necessarily indicative of the results to be expected for the year ending December 31, 2023 (“fiscal 2023”), or for any other future annual or interim period. There have been no material changes to our significant accounting policies as described in our Annual Report on Form 10-K for the year ended December 31, 2022.
Use of Estimates	Use of Estimates The preparation of our condensed consolidated financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosures of contingent assets and liabilities at the date of the condensed consolidated financial statements and the reported amounts of revenue and expenses during the reporting period. On an ongoing basis, management evaluates its estimates, primarily those related to revenue recognition, stock-based compensation, income taxes, allowances for doubtful accounts, the useful lives of capitalized software development costs and other property, equipment and software and assumptions used in the impairment analyses of long-lived assets and goodwill. These estimates are based on historical data and experience, as well as various other factors that management believes to be reasonable under the circumstances, the results of which form the basis for making judgments about the carrying amount of assets and liabilities that are not readily apparent from other sources. Actual results may differ from these estimates under different assumptions or conditions. As of March 31, 2023, the impact of widespread macroeconomic and geopolitical uncertainties, including the continuing impact of COVID-19, bank failures, labor shortages, inflation and monetary supply shifts, rising interest rates, tightening of credit markets, recession risks, and potential disruptions from the Russia-Ukraine conflict, on our business continues to evolve. As a result, many of our estimates and assumptions consider macroeconomic and geopolitical factors in the market, which require increased judgment and
Comprehensive Loss	Comprehensive Loss For the periods presented, net loss is equal to comprehensive loss.
Accounts Receivable, Net of Allowances	Accounts Receivable, Net of Allowances The following table presents changes in the allowance for doubtful accounts for the three months ended March 31, 2023: (in thousands) Balance as of December 31, 2022 $ 1,015 Cumulative impact of accounting adoption 209 Provision for doubtful accounts 22 Write-offs, net of recoveries (84) Balance as of March 31, 2023 $ 1,162
Concentration of Risk	Concentration of Risk Financial instruments that potentially subject the Company to concentration of risk consist principally of cash and accounts receivable. The Company maintains its cash with financial institutions and its cash levels exceed the Federal Deposit Insurance Corporation’s federally insured limits. Accounts receivable include amounts due from customers with principal operations primarily in the United States. As of March 31, 2023, one individual customer accounted for 10.3% of consolidated accounts receivable. As of December 31, 2022, no individual customers accounted for 10.0% or greater of consolidated accounts receivable. As of March 31, 2023, two individual suppliers accounted for 15.7% and 10.6% of consolidated accounts payable and accrued liabilities. As of December 31, 2022, one supplier accounted for 24.6% of consolidated accounts payable and accrued liabilities. For the three months ended March 31, 2023, one advertising agency holding company accounted for 11.5% of the Company's total revenue. For the three months ended March 31, 2022, no advertising agency holding company accounted for 10.0% or more of the Company's total revenue. For the three months ended March 31, 2023 and 2022, there were no individual customers that accounted for 10.0% or more of the Company’s total revenues.
JOBS Act Election as an Emerging Growth Company	JOBS Act Election as an Emerging Growth Company On April 5, 2012, the Jumpstart Our Business Startups Act (the “JOBS Act”) was signed into law. The JOBS Act contains provisions that, among other things, reduce certain reporting requirements for qualifying public companies. As an “emerging growth company,” the Company may, under Section 7(a)(2)(B) of the Securities Act of 1933, as amended (the “Securities Act”), delay adoption of new or revised accounting standards applicable to public companies until such standards would otherwise apply to private companies. An “emerging growth company” is one with less than $1.235 billion in annual sales, has less than $700 million in market value of its shares of common stock held by non-affiliates and issues less than $1 billion of non-convertible debt over a three-year period. The Company may take advantage of this extended transition period until the first to occur of the date that it (i) is no longer an “emerging growth company” or (ii) affirmatively and irrevocably opts out of this extended transition period.
Recent Adopted Accounting Pronouncements	Recently Adopted Accounting Pronouncements Financial Instruments—Credit Losses In June 2016, the Financial Accounting Standards Board issued Accounting Standards Update ("ASU") No. 2016-13, Financial Instruments—Credit Losses (Topic 326) . ASU 2016-13 revises the impairment model to utilize an expected loss methodology in place of the currently used incurred loss methodology, which results in more timely recognition of losses on financial instruments. We adopted this standard at the beginning of fiscal 2023. As a result, we revised the impairment model to utilize an expected loss methodology in place of an incurred loss methodology related to our allowance for credit losses on our trade accounts receivable. We

Basis of Presentation and Sum_3

Basis of Presentation and Summary of Significant Accounting Policies (Tables)	3 Months Ended
	Mar. 31, 2023
Basis Of Presentation And Summary Of Significant Accounting Policies [Abstract]
Summary of Changes in Allowance for Doubtful Accounts	The following table presents changes in the allowance for doubtful accounts for the three months ended March 31, 2023: (in thousands) Balance as of December 31, 2022 $ 1,015 Cumulative impact of accounting adoption 209 Provision for doubtful accounts 22 Write-offs, net of recoveries (84) Balance as of March 31, 2023 $ 1,162

Revenue (Tables)

Revenue (Tables)	3 Months Ended
	Mar. 31, 2023
Revenue from Contract with Customer [Abstract]
Summary of Disaggregation of Revenue	The disaggregation of revenue was as follows: Three Months Ended 2023 2022 Over-time revenue $ 386 $ 137 Point-in-time revenue 41,334 42,492 Total revenue $ 41,720 $ 42,629

Property, Equipment and Softw_2

Property, Equipment and Software, Net (Tables)	3 Months Ended
	Mar. 31, 2023
Property, Plant and Equipment [Abstract]
Schedule of Major Classes of Property, Equipment and Software	Major classes of property, equipment, and software were as follows: As of As of December 31, 2023 2022 Capitalized software development costs $ 77,156 $ 72,988 Computer equipment 1,124 1,116 Purchased software 32 32 Furniture, fixtures and office equipment 957 1,226 Leasehold improvements 2,040 2,571 Total property, equipment and software 81,309 77,933 Less: Accumulated depreciation (57,035) (54,827) Total property, equipment and software, net $ 24,274 $ 23,106
Schedule of Depreciation	Depreciation recorded in the condensed consolidated statements of operations was as follows: Three Months Ended 2023 2022 Platform operations $ 2,712 $ 2,136 Sales and marketing — — Technology and development 393 595 General and administrative 147 136 Total $ 3,252 $ 2,867

Leases (Tables)

Leases (Tables)	3 Months Ended
	Mar. 31, 2023
Leases [Abstract]
Components of Lease Expense	The components of lease expense were as follows (in thousands): Three Months Ended March 31, 2023 2022 Operating lease cost $ 1,209 $ 812 Short-term lease cost 260 343 Variable lease cost 21 97 Total lease cost $ 1,490 $ 1,252
Summary of Future Minimum Lease Payments	Future minimum lease payments as of March 31, 2023 were as follows: As of Year 2023 Remainder of 2023 $ 3,659 2024 4,385 2025 4,270 2026 4,257 2027 4,182 Thereafter 10,811 Total undiscounted future lease payments 31,564 Less: Imputed interest (3,601) Present value of operating lease liabilities 27,963 Less: Operating lease liabilities, current (3,973) Operating lease liabilities, noncurrent $ 23,990

Intangible Assets, Net (Tables)

Intangible Assets, Net (Tables)	3 Months Ended
	Mar. 31, 2023
Goodwill and Intangible Assets Disclosure [Abstract]
Summary of Balances of Intangible Assets and Accumulated Amortization	The balances of intangible assets and accumulated amortization are as follows: As of March 31, 2023 Remaining Weighted-Average Useful Gross Amount Accumulated Net Carrying Amount Developed technology — $ 4,927 $ (4,927) $ — Customer relationships 0.8 2,300 (2,026) 274 Trademarks/tradenames 2.9 1,400 (1,167) 233 Total $ 8,627 $ (8,120) $ 507 As of December 31, 2022 Remaining Weighted- Average Useful Gross Amount Accumulated Net Carrying Amount Developed technology 0.1 $ 4,927 $ (4,869) $ 58 Customer relationships 1.1 2,300 (1,944) 356 Trademarks/tradenames 3.2 1,400 (1,147) 253 Total $ 8,627 $ (7,960) $ 667
Summary of Amortization of Intangible Assets Recorded in Consolidated Statements of Operations	Amortization of intangible assets recorded in the condensed consolidated statements of operations was as follows: Three Months Ended 2023 2022 Platform operations $ 58 $ 175 Sales and marketing — — Technology and development — — General and administrative 102 112 Total $ 160 $ 287
Summary of Estimated Future Amortization of Intangible Assets	Estimated future amortization of intangible assets is as follows: As of March 31, Year 2023 Remainder of 2023 $ 306 2024 107 2025 80 2026 14 2027 — Thereafter — Total $ 507

Accrued Liabilities (Tables)

Accrued Liabilities (Tables)	3 Months Ended
	Mar. 31, 2023
Payables and Accruals [Abstract]
Summary of Accrued Liabilities	The Company’s accrued liabilities consisted of the following: As of As of December 31, 2023 2022 Accrued traffic acquisition costs $ 25,188 $ 29,631 Other accrued liabilities 3,392 5,432 Total accrued liabilities $ 28,580 $ 35,063

Stock-Based Compensation (Table

Stock-Based Compensation (Tables)	3 Months Ended
	Mar. 31, 2023
Share-Based Payment Arrangement [Abstract]
Summary of Stock-based Compensation	Stock-based compensation recorded in the condensed consolidated statements of operations was as follows: Three Months Ended 2023 2022 Platform operations $ 892 $ 1,086 Sales and marketing 2,512 2,179 Technology and development 1,327 1,169 General and administrative 2,741 1,942 Total $ 7,472 $ 6,376
Summary of RSU Activity	The following summarizes RSU activity: Number of Shares Weighted-Average RSUs outstanding as of December 31, 2022 3,928 $ 12.59 Granted 1,406 4.41 Vested (800) 13.38 Canceled/forfeited (38) 7.02 RSUs outstanding as of March 31, 2023 4,496 9.94
Summary of Nonqualified Stock Option Activity	The following summarizes nonqualified stock option activity: Number of Options Weighted-Average Weighted-Average Aggregate Intrinsic Value Outstanding as of December 31, 2022 3,661 $ 6.14 9.2 $ — Granted 2,127 4.43 Exercised — — Canceled (8) 10.35 Expired (25) 22.65 Outstanding as of March 31, 2023 5,755 5.43 9.3 33 Vested and exercisable 802 6.22 8.9 —
Summary of Assumptions used in Black-Scholes Model to Determine Fair Value of Nonqualified Stock Options Granted	The following table presents the assumptions used in the Black-Scholes model to determine the fair value of nonqualified stock options for the three months ended March 31, 2023 and 2022. Three Months Ended 2023 2022 Risk free interest rate 4.3% 1.4% Expected volatility 81.5% 61.5% Expected term (in years) 6.0 5.9 Expected dividend yield 0.0% 0.0%

Loss Per Share (Tables)

Loss Per Share (Tables)	3 Months Ended
	Mar. 31, 2023
Earnings Per Share [Abstract]
Calculation of Basic and Diluted Net Loss Per Share	The following table presents the calculation of basic and diluted net loss per share for the three months ended March 31, 2023 and 2022 : Three Months Ended 2023 2022 Numerator Net loss $ (9,376) $ (13,563) Less: Net loss attributable to noncontrolling interests (6,896) (10,371) Net loss attributable to Viant Technology Inc. $ (2,480) $ (3,192) Denominator Weighted-average shares of Class A common stock outstanding—basic and diluted 14,748 13,809 Loss per share of Class A common stock—basic $ (0.17) $ (0.23) Loss per share of Class A common stock—diluted $ (0.17) $ (0.23) Anti-dilutive shares excluded from loss per share of Class A common stock—diluted: Restricted stock units 4,496 4,858 Nonqualified stock options 5,755 3771 Shares of Class B common stock 47,082 47,082 Total shares excluded from loss per share of Class A common stock—diluted 57,333 55,711

Noncontrolling Interests (Table

Noncontrolling Interests (Tables)	3 Months Ended
	Mar. 31, 2023
Noncontrolling Interest [Abstract]
Summary Ownership of Viant Technology LLC	The following table summarizes the ownership of Viant Technology LLC: As of March 31, 2023 As of December 31, 2022 Owner Units Owned Ownership Percentage Units Owned Ownership Percentage Viant Technology Inc. 15,064,581 24.2 % 14,643,798 23.7 % Noncontrolling interests 47,082,260 75.8 % 47,082,260 76.3 % Total 62,146,841 100.0 % 61,726,058 100.0 %
Summary of Effect of Changes in Ownership Interest in Viant Technology LLC on Equity	The following table presents the effect of changes in the Company’s ownership interest in Viant Technology LLC on the Company’s equity for the periods indicated: Three Months Ended 2023 2022 Net loss attributable to Viant Technology Inc. $ (2,480) $ (3,192) Transfers to noncontrolling interests: Decrease in the additional-paid-in-capital of Viant Technology Inc. resulting from ownership changes in Viant Technology LLC (2,377) (4,276) Change from net loss attributable to Viant Technology Inc. and transfers to noncontrolling interests $ (4,857) $ (7,468)

Nature of Operations - Addition

Nature of Operations - Additional Information (Details) $ / shares in Units, $ in Millions	Feb. 12, 2021 USD ($) $ / shares shares	Mar. 31, 2023 shares	Dec. 31, 2022 shares
Nature Of Operations [Line Items]
Preferred stock, shares authorized (shares)	10,000,000	10,000,000	10,000,000
Underwriters
Nature Of Operations [Line Items]
Common stock shares issued and sold (shares)	10,000,000
Sale of stock (USD per share) | $ / shares	$ 25
Proceeds from issuance of common stock, net of underwriting discounts | $	$ 250
Payments of stock issuance costs | $	$ 17.5
Class A Common Stock
Nature Of Operations [Line Items]
Common stock, shares authorized (shares)	450,000,000	450,000,000	450,000,000
Underwrites options exercised shares issued (shares)	1,500,000
Common stock voting rights percentage	19.50%
Percentage of voting rights of outstanding common stock	100%
Class B Common Stock
Nature Of Operations [Line Items]
Common stock, shares authorized (shares)	150,000,000	150,000,000	150,000,000
Common stock voting rights percentage	80.50%
Class B Common Stock | Viant Technology LLC
Nature Of Operations [Line Items]
Common stock shares issued for each membership unit (shares)	1
Common stock shares issued to continuing members (shares)	48,935,559
Continuing Members Class B Units | Viant Technology LLC
Nature Of Operations [Line Items]
Exchange basis	1
Continuing members, membership units (shares)	48,935,559
Class A Units
Nature Of Operations [Line Items]
Members equity units received in exchange of units (shares)	1,500,000
Class A Units | Viant Technology LLC
Nature Of Operations [Line Items]
Payments to acquire units | $	$ 232.5
Member units acquired (shares)	10,000,000

Basis of Presentation and Sum_4

Basis of Presentation and Summary of Significant Accounting Policies - Summary of Changes in Allowance for Doubtful Accounts (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	$ 1,015
Provision for doubtful accounts	22	$ 51
Write-offs, net of recoveries	(84)
Ending balance	1,162
Cumulative Effect, Period of Adoption, Adjustment
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	$ 209

Basis of Presentation and Sum_5

Basis of Presentation and Summary of Significant Accounting Policies - Additional Information (Details)	3 Months Ended	12 Months Ended
	Mar. 31, 2023	Dec. 31, 2022
Customer Concentration Risk | Customer One | Accounts Receivable
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items]
Concentration risk, percentage	10.30%
Supplier Concentration Risk | Accounts Payable and Accrued Liabilities | Supplier One
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items]
Concentration risk, percentage	15.70%	24.60%
Supplier Concentration Risk | Accounts Payable and Accrued Liabilities | Supplier Two
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items]
Concentration risk, percentage	10.60%
Revenue from Rights Concentration Risk | Customer One | Total Revenues
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items]
Concentration risk, percentage	11.50%

Revenue - Summary of Disaggrega

Revenue - Summary of Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Disaggregation Of Revenue [Line Items]
Revenue	$ 41,720	$ 42,629
Over-time revenue
Disaggregation Of Revenue [Line Items]
Revenue	386	137
Point-in-time revenue
Disaggregation Of Revenue [Line Items]
Revenue	$ 41,334	$ 42,492

Revenue - Additional Informatio

Revenue - Additional Information (Details) - USD ($) $ in Millions	Mar. 31, 2023	Dec. 31, 2022
Expected Duration of Greater Than One Year
Disaggregation Of Revenue [Line Items]
Revenue for unsatisfied performance obligation expected to be recognized in the future, amount	$ 1.1	$ 0.1

Property, Equipment and Softw_3

Property, Equipment and Software, Net - Schedule of Major Classes of Property, Equipment and Software (Details) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Property Plant And Equipment [Line Items]
Total property, equipment and software	$ 81,309	$ 77,933
Less: Accumulated depreciation	(57,035)	(54,827)
Total property, equipment and software, net	24,274	23,106
Capitalized software development costs
Property Plant And Equipment [Line Items]
Total property, equipment and software	77,156	72,988
Computer equipment
Property Plant And Equipment [Line Items]
Total property, equipment and software	1,124	1,116
Purchased software
Property Plant And Equipment [Line Items]
Total property, equipment and software	32	32
Furniture, fixtures and office equipment
Property Plant And Equipment [Line Items]
Total property, equipment and software	957	1,226
Leasehold improvements
Property Plant And Equipment [Line Items]
Total property, equipment and software	$ 2,040	$ 2,571

Property, Equipment and Softw_4

Property, Equipment and Software, Net - Schedule of Depreciation (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Property Plant And Equipment [Line Items]
Depreciation	$ 3,252	$ 2,867
Platform operations
Property Plant And Equipment [Line Items]
Depreciation	2,712	2,136
Sales and marketing
Property Plant And Equipment [Line Items]
Depreciation	0	0
Technology and development
Property Plant And Equipment [Line Items]
Depreciation	393	595
General and administrative
Property Plant And Equipment [Line Items]
Depreciation	$ 147	$ 136

Property, Equipment and Softw_5

Property, Equipment and Software, Net - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Property, Plant and Equipment [Abstract]
Interest cost incurred	$ 0.1	$ 0.2

Leases - Additional Information

Leases - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Lessee Lease Description [Line Items]
Operating leases for office space remaining lease terms	8 years
Operating lease weighted average remaining lease term	7 years
Operating lease weighted average incremental borrowing rate	3.50%
Cash paid for amounts included in operating lease liabilities	$ 1	$ 0.6
Maximum
Lessee Lease Description [Line Items]
Lessee operating lease renewal term	5 years

Leases - Components of Lease Ex

Leases - Components of Lease Expense (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Leases [Abstract]
Operating lease cost	$ 1,209	$ 812
Short-term lease cost	260	343
Variable lease cost	21	97
Total lease cost	$ 1,490	$ 1,252

Leases - Summary of Future Mini

Leases - Summary of Future Minimum Lease Payments (Details) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Leases [Abstract]
Remainder of 2023	$ 3,659
2024	4,385
2025	4,270
2026	4,257
2027	4,182
Thereafter	10,811
Total undiscounted future lease payments	31,564
Less: Imputed interest	(3,601)
Present value of operating lease liabilities	27,963
Less: Operating lease liabilities, current	(3,973)	$ (3,711)
Long-term portion of operating lease liabilities	$ 23,990	$ 24,998

Intangible Assets, Net - Summar

Intangible Assets, Net - Summary of Balances of Intangibles Assets and Accumulated Amortization (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2023	Dec. 31, 2022
Finite Lived Intangible Assets [Line Items]
Gross Amount	$ 8,627	$ 8,627
Accumulated Amortization	(8,120)	(7,960)
Net Carrying Amount	507	$ 667
Developed technology
Finite Lived Intangible Assets [Line Items]
Remaining Weighted-Average Useful Life (years)		1 month 6 days
Gross Amount	4,927	$ 4,927
Accumulated Amortization	(4,927)	(4,869)
Net Carrying Amount	$ 0	$ 58
Customer relationships
Finite Lived Intangible Assets [Line Items]
Remaining Weighted-Average Useful Life (years)	9 months 18 days	1 year 1 month 6 days
Gross Amount	$ 2,300	$ 2,300
Accumulated Amortization	(2,026)	(1,944)
Net Carrying Amount	$ 274	$ 356
Trademarks/tradenames
Finite Lived Intangible Assets [Line Items]
Remaining Weighted-Average Useful Life (years)	2 years 10 months 24 days	3 years 2 months 12 days
Gross Amount	$ 1,400	$ 1,400
Accumulated Amortization	(1,167)	(1,147)
Net Carrying Amount	$ 233	$ 253

Intangible Assets, Net - Summ_2

Intangible Assets, Net - Summary of Amortization of Intangible Assets Recorded in Consolidated Statements of Operations (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Finite Lived Intangible Assets [Line Items]
Amortization of intangible assets	$ 160	$ 287
Platform operations
Finite Lived Intangible Assets [Line Items]
Amortization of intangible assets	58	175
Sales and marketing
Finite Lived Intangible Assets [Line Items]
Amortization of intangible assets	0	0
Technology and development
Finite Lived Intangible Assets [Line Items]
Amortization of intangible assets	0	0
General and administrative
Finite Lived Intangible Assets [Line Items]
Amortization of intangible assets	$ 102	$ 112

Intangible Assets, Net - Summ_3

Intangible Assets, Net - Summary of Estimated Future Amortization of Intangible Assets (Details) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Goodwill and Intangible Assets Disclosure [Abstract]
Remainder of 2023	$ 306
2024	107
2025	80
2026	14
2027	0
Thereafter	0
Net Carrying Amount	$ 507	$ 667

Accrued Liabilities - Summary o

Accrued Liabilities - Summary of Accrued Liabilities (Details) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Payables and Accruals [Abstract]
Accrued traffic acquisition costs	$ 25,188	$ 29,631
Other accrued liabilities	3,392	5,432
Total accrued liabilities	$ 28,580	$ 35,063

Accrued Liabilities - Additiona

Accrued Liabilities - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022	Dec. 31, 2022
Payables and Accruals [Abstract]
Expenses incurred	$ 0.2	$ 0
Payable to related parties	$ 0.2		$ 0.2

Revolving Credit Facility - Add

Revolving Credit Facility - Additional Information (Details) - Loan Agreement - Revolving Credit Facility - PNC Bank		3 Months Ended
	Oct. 31, 2019 USD ($)	Mar. 31, 2023 USD ($)
Line Of Credit Facility [Line Items]
Senior secured revolving credit facility, maximum borrowing capacity	$ 40,000,000
Outstanding balance		$ 0
Facility fee for undrawn amounts	0.375%
Fixed coverage charge ratio	1.40
Undrawn availability percentage	0.25
Domestic Rate Loans
Line Of Credit Facility [Line Items]
Debt instrument, basis spread on variable rate plus margin	0.50%
Domestic Rate Loans | Minimum
Line Of Credit Facility [Line Items]
Debt instrument, basis spread on variable rate plus margin	0.75%	0.75%
Domestic Rate Loans | Maximum
Line Of Credit Facility [Line Items]
Debt instrument, basis spread on variable rate plus margin	1.25%
LIBOR Rate Loans
Line Of Credit Facility [Line Items]
Debt instrument, basis spread on variable rate plus margin	1%
LIBOR Rate Loans | Minimum
Line Of Credit Facility [Line Items]
Debt instrument, basis spread on variable rate plus margin	1.75%
LIBOR Rate Loans | Maximum
Line Of Credit Facility [Line Items]
Debt instrument, basis spread on variable rate plus margin	2.25%	1.75%

Stock-Based Compensation - Addi

Stock-Based Compensation - Additional Information (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions		3 Months Ended
	Feb. 12, 2021	Mar. 31, 2023	Mar. 31, 2022
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Expected dividend yield assumption		0%	0%
Restricted Stock Units
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Share based payment award equity instruments other than options grants in period		1,406
Unrecognized stock-based compensation expected to be recognized		$ 39.1
Unrecognized stock-based compensation expected to be recognized over a weighted-average period		2 years 2 months 12 days
Nonqualified Stock Options
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Unrecognized stock-based compensation expected to be recognized		$ 16
Unrecognized stock-based compensation expected to be recognized over a weighted-average period		2 years 7 months 6 days
Weighted-average grant-date fair value of stock options granted (in dollars per share)		$ 2.99
LTIP | Class A Common Stock
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Shares remained available for grant		4,500
LTIP | Restricted Stock Units
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Share based payment award equity instruments other than options grants in period	6,200

Stock-Based Compensation - Summ

Stock-Based Compensation - Summary of Stock-based Compensation (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Stock-based compensation expense	$ 7,472	$ 6,376
Platform operations
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Stock-based compensation expense	892	1,086
Sales and marketing
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Stock-based compensation expense	2,512	2,179
Technology and development
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Stock-based compensation expense	1,327	1,169
General and administrative
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Stock-based compensation expense	$ 2,741	$ 1,942

Stock-Based Compensation - Su_2

Stock-Based Compensation - Summary of RSU Activity (Details) - Restricted Stock Units shares in Thousands	3 Months Ended
	Mar. 31, 2023 $ / shares shares
Share-Based Compensation Arrangement by Share-Based Payment Award, Non-Option Equity Instruments, Outstanding [Roll Forward]
RSUs outstanding, beginning balance (shares) | shares	3,928
Granted (shares) | shares	1,406
Vested (shares) | shares	(800)
Canceled/forfeited (shares) | shares	(38)
RSUs outstanding, ending balance (shares) | shares	4,496
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]
Weighted-Average Grant-Date Fair Value of RSUs outstanding, beginning balance (USD per share) | $ / shares	$ 12.59
Granted (USD per share) | $ / shares	4.41
Vested (USD per share) | $ / shares	13.38
Canceled/forfeited (USD per share) | $ / shares	7.02
Weighted-Average Grant-Date Fair Value of RSUs outstanding, ending balance (USD per share) | $ / shares	$ 9.94

Stock-Based Compensation - Su_3

Stock-Based Compensation - Summary of Nonqualified Stock Option Activity (Details) - Nonqualified Stock Options - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended	6 Months Ended
	Mar. 31, 2023	Jun. 30, 2022	Dec. 31, 2022
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding [Roll Forward]
Number of Options outstanding, beginning balance (shares)	3,661,000
Granted (shares)	2,127,000
Canceled (shares)	(8,000)
Expired (shares)	(25,000)
Number of Options outstanding, ending balance (shares)	5,755,000
Vested and exercisable (shares)	802,000
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract]
Weighted-Average Exercise Price of outstanding, beginning balance (USD per share)	$ 6.14
Granted (USD per share)	4.43
Canceled (USD per share)	10.35
Expired (USD per share)	22.65
Weighted-Average Exercise Price of outstanding, ending balance (USD per share)	5.43
Vested and exercisable (USD per share)	$ 6.22
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term [Abstract]
Weighted-Average Remaining Contractual Term (years)	9 years 3 months 18 days	9 years 2 months 12 days
Weighted-Average Remaining Contractual Term of Options, Vested and exercisable	8 years 10 months 24 days
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Aggregate Intrinsic Value [Abstract]
Aggregate Intrinsic Value	$ 33		$ 0

Stock-Based Compensation - Su_4

Stock-Based Compensation - Summary of Assumptions used in Black-Scholes Model to Determine Fair Value of Nonqualified Stock Options Granted (Details)	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Risk free interest rate	4.30%	1.40%
Expected volatility	81.50%	61.50%
Expected term (in years)	6 years	5 years 10 months 24 days
Expected dividend yield	0%	0%

Income Taxes and Tax Receivab_2

Income Taxes and Tax Receivable Agreement - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Income Tax Disclosure [Abstract]
U.S. statutory federal income tax rate	21%
Percentage of exclusive of non-controlling interest due to income tax expense/(benefit) not recognize on share of pre-tax book income (loss)	75.80%
Effective tax rate	0%	0%
TRA liability	$ 10.3

Loss Per Share - Calculation of

Loss Per Share - Calculation of Basic and Diluted Net Loss Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Numerator
Net loss	$ (9,376)	$ (13,563)
Less: Net loss attributable to noncontrolling interests	(6,896)	(10,371)
Net loss attributable to Viant Technology Inc.	$ (2,480)	$ (3,192)
Weighted-average shares of Class A common stock outstanding:
Weighted-average shares of Class A common stock outstanding—basic (shares)	14,748,000	13,809,000
Weighted-average shares of Class A common stock outstanding—diluted (shares)	14,748,000	13,809,000
Basic (USD per share)	$ (0.17)	$ (0.23)
Diluted (USD per share)	$ (0.17)	$ (0.23)
Anti-dilutive shares excluded from loss per share of Class A common stock—diluted:
Total shares excluded from loss per share of Class A common stock—diluted (shares)	57,333,000	55,711,000
Class A Common Stock
Weighted-average shares of Class A common stock outstanding:
Weighted-average shares of Class A common stock outstanding—basic (shares)	14,748,000	13,809,000
Weighted-average shares of Class A common stock outstanding—diluted (shares)	14,748,000	13,809,000
Class B Common Stock
Anti-dilutive shares excluded from loss per share of Class A common stock—diluted:
Total shares excluded from loss per share of Class A common stock—diluted (shares)	47,082,000	47,082,000
Restricted Stock Units
Anti-dilutive shares excluded from loss per share of Class A common stock—diluted:
Total shares excluded from loss per share of Class A common stock—diluted (shares)	4,496,000	4,858,000
Nonqualified Stock Options
Anti-dilutive shares excluded from loss per share of Class A common stock—diluted:
Total shares excluded from loss per share of Class A common stock—diluted (shares)	5,755,000	3,771,000

Noncontrolling Interests - Addi

Noncontrolling Interests - Additional Information (Details)	3 Months Ended
	Mar. 31, 2023 shares
Class A Common Stock
Minority Interest [Line Items]
Exchange units for shares of common stock (shares)	1

Noncontrolling Interests - Summ

Noncontrolling Interests - Summary Ownership of Viant Technology LLC (Details) - Viant Technology LLC - shares	3 Months Ended	12 Months Ended
	Mar. 31, 2023	Dec. 31, 2022
Minority Interest [Line Items]
Units Owned (shares)	62,146,841	61,726,058
Ownership Percentage	100%	100%
Viant Technology Inc.
Minority Interest [Line Items]
Units Owned (shares)	15,064,581	14,643,798
Ownership percentage by Viant Technology Inc.	24.20%	23.70%
Noncontrolling Interests
Minority Interest [Line Items]
Units Owned (shares)	47,082,260	47,082,260
Ownership percentage by non-controlling interests	75.80%	76.30%

Noncontrolling Interests - Su_2

Noncontrolling Interests - Summary of Effect of Changes in Ownership Interest in Viant Technology LLC on Equity (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Noncontrolling Interest [Abstract]
Net loss attributable to Viant Technology Inc.	$ (2,480)	$ (3,192)
Transfers to noncontrolling interests:
Decrease in the additional-paid-in-capital of Viant Technology Inc. resulting from ownership changes in Viant Technology LLC	(2,377)	(4,276)
Change from net loss attributable to Viant Technology Inc. and transfers to noncontrolling interests	$ (4,857)	$ (7,468)

Commitments and Contingencies -

Commitments and Contingencies - Additional Information (Details) $ in Millions	Mar. 31, 2023 USD ($)
Commitments and Contingencies Disclosure [Abstract]
Contractual obligations, remainder of 2023	$ 8.8
Contractual obligation, to be paid 2024	6.1
Contractual obligation, to be paid 2025	5
Contractual obligation, to be paid 2026	$ 0.8

Subsequent Events (Details)

Subsequent Events (Details) - Revolving Credit Facility - PNC Bank - Loan Agreement - USD ($)	Apr. 04, 2023	Oct. 31, 2019
Subsequent Event [Line Items]
Senior secured revolving credit facility, maximum borrowing capacity		$ 40,000,000
Subsequent Event
Subsequent Event [Line Items]
Senior secured revolving credit facility, maximum borrowing capacity	$ 75,000,000
Subsequent Event | Minimum | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate
Subsequent Event [Line Items]
Debt instrument, basis spread on variable rate plus margin	2%
Subsequent Event | Maximum | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate
Subsequent Event [Line Items]
Debt instrument, basis spread on variable rate plus margin	2.25%