Business Acquisition Business Acquisition [Axis] Partner Type of Partners' Capital Account, Name Partner Type of Partners' Capital Account, Name [Domain] Increase (Decrease) in Stockholders' Equity [Roll Forward] Increase (Decrease) in Stockholders' Equity [Roll Forward] Foreign income tax Current Foreign Tax Expense (Benefit) Total undiscounted future lease payments Lessee, Operating Lease, Liability, to be Paid Net income (loss) Net income (loss) Net income (loss) Net Income (Loss), Including Portion Attributable to Noncontrolling Interest Related Party Transactions [Abstract] Related Party Transactions [Abstract] Provision for (recovery of) doubtful accounts Provision for (recovery of) doubtful accounts Accounts Receivable, Credit Loss Expense (Reversal) 2016 Convertible Preferred Units Two Thousand Sixteen Convertible Preferred Units [Member] Two thousand sixteen convertible preferred units. Entity Address, Postal Zip Code Entity Address, Postal Zip Code Nature Of Operations [Table] Nature Of Operations [Table] Nature of Operations. Due from (to) related party Related Party Transaction, Due from (to) Related Party, Current Property, Plant and Equipment [Abstract] Property, Plant and Equipment [Abstract] Deferred: Deferred Income Tax Expense (Benefit), Continuing Operations [Abstract] Preferred stock, shares outstanding Preferred Stock, Shares Outstanding Percentage of voting rights of outstanding common stock Percentage Of Voting Rights Of Outstanding Common Stock Percentage of voting rights of outstanding common stock. Debt Instrument Debt Instrument [Axis] Total property, equipment and software Property, Plant and Equipment, Gross Member units acquired, units (in shares) Members Equity Units Acquired During Period Member units acquired during period shares. Expenses incurred Related Party Transaction, Expenses from Transactions with Related Party Senior secured revolving credit facility, maximum borrowing capacity Line of Credit Facility, Maximum Borrowing Capacity Income Tax Disclosure [Abstract] Income Tax Disclosure [Abstract] Hosting commitments Contractual Obligation, Hosting Commitments Contractual Obligation, Hosting Commitments Accrued Interest Forgiveness Accrued Interest Forgiveness [Member] Accrued interest forgiveness. Fixed coverage charge ratio Line Of Credit Facility, Fixed Coverage Charge Ratio Line Of Credit Facility, Fixed Coverage Charge Ratio Purchased software Software and Software Development Costs [Member] Weighted average interest rate Long-Term Debt, Weighted Average Interest Rate, over Time Accrued compensation Increase Decrease In Accrued Compensation Increase decrease in Accrued compensation. Fair Value of Financial Instruments Fair Value of Financial Instruments, Policy [Policy Text Block] Additional paid-in capital Additional Paid in Capital Income Approach Valuation, Income Approach [Member] Debt instrument, basis spread on variable rate plus margin Debt Instrument, Basis Spread on Variable Rate Statistical Measurement Statistical Measurement [Domain] Continuing Members Class B Units Continuing Members Class B Units [Member] Continuing members class B units. Four Brothers 2 LLC Four Brothers2 Limited Liability Company [Member] Four brothers 2 limited liability company. Depreciation Depreciation Summary of Future Minimum Payments Under Non-Cancelable Operating Leases Schedule of Future Minimum Rental Payments for Operating Leases [Table Text Block] Total deferred tax assets Deferred Tax Assets, Net Tax receivable agreement required to make payments to shareholders realized percentage of tax benefits in event that exchange of units to shares Tax Receivable Agreement Required To Make Payments To Shareholders Realized Percentage Of Tax Benefits In Event That Exchange Of Units To Shares Tax receivable agreement required to make payments to shareholders realized percentage of tax benefits in event that exchange of units to shares. Bears interest at an annual rate Debt Instrument, Interest Rate, Stated Percentage Valuation Approach and Technique Valuation Approach and Technique [Axis] Share-based Payment Arrangement [Abstract] Share-Based Payment Arrangement [Abstract] Federal Domestic Tax Authority [Member] Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items] Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items] Basis of presentation and summary of significant accounting policies. State and local income tax Current State and Local Tax Expense (Benefit) Beginning balance, convertible preferred units (shares) Ending balance, convertible preferred units (shares) Temporary Equity, Shares Outstanding Repurchase of treasury stock in connection with the taxes paid related to net share settlement of equity awards Treasury Stock, Value, Acquired, Cost Method Net loss attributable to Viant Technology Inc. Net loss attributable to Viant Technology Inc. Net Income (Loss) Attributable to Parent Measurement Input Type Measurement Input Type [Domain] Lessee Lease Description [Table] Lessee, Lease, Description [Table] Noncash gain on extinguishment of debt related to Paycheck Protection Program loan Noncash Gain On Extinguishment Of Debt Related To P P P Loan Noncash gain on extinguishment of debt related to PPP loan. Total shares excluded from earnings (loss) per share of Class A common stock/unit—diluted (shares) Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount Document Information [Line Items] Document Information [Line Items] Accrued member tax distributions Accrued Member Tax Distributions Accrued member tax distributions. Domestic Rate Loans Fed Funds Effective Rate Overnight Index Swap Rate [Member] Other, net Effective Income Tax Rate Reconciliation, Other Adjustments, Percent Thereafter Lessee, Operating Lease, Liability, to be Paid, after Year Five Equity Component Equity Component [Domain] Ownership Ownership [Axis] Leases Lessee, Operating Leases [Text Block] Valuation Approach and Technique Valuation Approach and Technique [Domain] Loan Agreement Loan Agreement [Member] Loan agreement. Related Party Related Party [Domain] Lessee Lease Description [Line Items] Lessee, Lease, Description [Line Items] Beginning balance, treasury stock Ending balance, treasury stock Treasury Stock, Common, Value Plan Name Plan Name [Axis] Unit Repurchase Agreement Unit Repurchase Agreement [Member] Unit repurchase agreement. Standby Letters of Credit Standby Letters of Credit [Member] Tax Credit Carryforward, Name [Domain] Tax Credit Carryforward, Name [Domain] Operating Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration] Operating Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration] Class A Units Members Equity Class A Units [Member] Members equity class A units. Supplemental disclosure of cash flow information: Supplemental Cash Flow Information [Abstract] Weighted average grant date fair value of units, canceled (dollars per share) Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Forfeitures in Period, Weighted Average Exercise Price Debt securities yield period Debt Securities Yield Period Debt securities yield period. Noncontrolling Interest [Abstract] Noncontrolling Interest [Abstract] Plan Name Plan Name [Domain] Amount capitalized within property, equipment and software, net Property Equipment And Software Interests Capitalization Amount Property equipment and software interests capitalization amount. Statement of Cash Flows [Abstract] Statement of Cash Flows [Abstract] Entity Address, State or Province Entity Address, State or Province Undistributed earnings (loss) attributable to all unitholders Undistributed Earnings Loss Attributable To All Unitholders Undistributed earnings (loss) attributable to all unitholders. Ownership Percentage Ownership Interest Percentage Ownership interest percentage. 2023 Operating Leases, Future Minimum Payments, Due in Two Years Weighted-Average Remaining Contractual Term (years) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term Award Type Award Type [Axis] Basis of Presentation and Summary of Significant Accounting Policies Basis of Presentation and Significant Accounting Policies [Text Block] Net cash provided by (used in) operating activities Net Cash Provided by (Used in) Operating Activities Current portion of operating lease liabilities Less: Operating lease liabilities, current Operating Lease, Liability, Current Expired (shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Expirations in Period Schedule Of Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Table] Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Table] Accounts Payable and Accrued Liabilities Accounts Payable And Accrued Liabilities Current [Member] Accounts payable and accrued liabilities current. Operating expenses: Costs and Expenses [Abstract] Lender Name Lender Name [Axis] Canceled (shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Forfeitures in Period Convertible Preferred Units And Common Units [Abstract] Convertible Preferred Units And Common Units [Abstract] Convertible preferred units and common units. Document Annual Report Document Annual Report Transfers to noncontrolling interests: Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Changes, Net [Abstract] Legal Entity Legal Entity [Axis] Long-term debt Total long-term debt Long-Term Debt, Excluding Current Maturities Total liabilities Liabilities Technology and development Technology And Development Expenses Technology and development expenses. Fair value of common units into preferred units are convertible at issuance per unit (dollars per share) Preferred Stock, Convertible, Conversion Price Operating lease weighted average remaining lease term Operating Lease, Weighted Average Remaining Lease Term Share Based Compensation Arrangement By Share Based Payment Award [Line Items] Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] Cash flows used in investing activities: Net Cash Provided by (Used in) Investing Activities [Abstract] Supplier One Supplier One [Member] Supplier one. Issuance of Class A common stock in initial public offering, net of underwriting and offering costs Stock Issued During Period, Value, New Issues Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding Effective conversion price per unit (dollars per share) Preferred Stock Convertible Effective Conversion Price Preferred stock convertible effective conversion price. Revolving Credit Facility Revolving Credit Facility [Member] Schedule of Major Classes of Property, Equipment and Software Property, Plant and Equipment [Table Text Block] Summary Ownership of Viant Technology LLC Schedule Of Noncontrolling Ownership Interests Table [Table Text Block] Schedule of noncontrolling ownership interests. Beginning balance, convertible preferred units Ending balance, convertible preferred units Temporary Equity, Carrying Amount, Including Portion Attributable to Noncontrolling Interests Current: Current Income Tax Expense (Benefit), Continuing Operations [Abstract] Preferred stock, shares issued Preferred Stock, Shares Issued Document Type Document Type Effect of Reorganization Transactions Temporary Equity Value Effect Of Reorganization Transactions Temporary equity, value, effect of reorganization transactions. Common units, units issued (shares) Common Unit, Issued Point in time Transferred at Point in Time [Member] Property, equipment and software, estimated useful lives Property, Plant and Equipment, Useful Life Issuance of Class A common stock in initial public offering, net of underwriting and offering costs (shares) Number Of Class A Common Shares Issued And Number Of Shares Converted From Class B Common Stock To Class A Common Stock During Period Including Those Related To Reorganization Transactions And Initial Public Offering Number of Class A common shares issued and number of shares converted from Class B common stock to Class A common stock during the period, including those related to reorganization transactions and an initial public offering. Concentration Risk Benchmark Concentration Risk Benchmark [Domain] Finite-Lived Intangible Assets, Major Class Name Finite-Lived Intangible Assets, Major Class Name [Domain] Weighted-average grant-date fair value, beginning balance (dollars per share) Weighted-average grant-date fair value, ending balance (dollars per share) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value Revolving Credit Facility and PPP Loan Debt Disclosure [Text Block] Common Units Member Units [Member] Exchange of Class B common stock for Class A common stock Stock Issued During Period, Value, Conversion of Units Entity Shell Company Entity Shell Company Class B Common Stock Common Class B [Member] Accrued liabilities Increase (Decrease) in Accrued Liabilities Exchange basis for continuing members Continuing Members, Exchange Basis Continuing Members, Exchange Basis Deferred revenue Increase (Decrease) in Deferred Revenue 2023 Lessee, Operating Lease, Liability, to be Paid, Year One Developed technology Developed Technology Rights [Member] 2019 Convertible Preferred Units Two Thousand Nineteen Convertible Preferred Units [Member] Two thousand nineteen convertible preferred units. Summary of Changes in Deferred Revenue Contract with Customer, Contract Asset, Contract Liability, and Receivable [Table Text Block] Document Period End Date Document Period End Date Accrued compensation Accrued Salaries, Current Convertible Preferred Units Convertible Preferred Stock [Member] Total assets Assets Write-offs, net of recoveries Accounts Receivable, Allowance for Credit Loss, Writeoff Convertible Preferred Units And Common Units [Table] Convertible Preferred Units And Common Units [Table] Convertible preferred units and common units. Debt Disclosure [Abstract] Debt Disclosure [Abstract] Supplier Supplier [Domain] Earnings (loss) per Class A common stock/unit: Earnings Per Share [Abstract] Accounts Receivable, Net of Allowances Accounts Receivable [Policy Text Block] Income Statement Location Income Statement Location [Axis] Antidilutive Securities Antidilutive Securities [Axis] Accrued liabilities Total accrued liabilities Accrued Liabilities, Current Credit Concentration Risk Credit Concentration Risk [Member] Less: Current portion of long-term debt Long-Term Debt, Current Maturities Numerator Net Income (Loss) Available to Common Stockholders, Basic [Abstract] 2027 Lessee, Operating Lease, Liability, to be Paid, Year Five Net cash provided by (used in) financing activities Net Cash Provided by (Used in) Financing Activities Variable lease cost Variable Lease, Cost Stockholders’ equity Stockholders' Equity Attributable to Parent [Abstract] Prepaid expenses and other current assets Prepaid Expense and Other Assets, Current Noncontrolling Interests Noncontrolling Interest Disclosure [Text Block] Earnings (Loss) Per Share/Unit Earnings Per Share [Text Block] Other, net Deferred Tax Liabilities, Other Customer Customer [Axis] Summary of Assumptions used in Fair Value of Stock Options Granted Schedule of Share-Based Payment Award, Stock Options, Valuation Assumptions [Table Text Block] Liquidation preference calculated percentage Temporary Equity Liquidation Preference Calculated Percentage Temporary equity liquidation preference calculated percentage. Cash and Cash Equivalents Cash and Cash Equivalents, Policy [Policy Text Block] Operating lease liabilities Increase (Decrease) in Operating Lease Liability Related Party Transaction [Line Items] Related Party Transaction [Line Items] Schedule of Provision for Income Taxes Schedule of Components of Income Tax Expense (Benefit) [Table Text Block] Award Type Award Type [Domain] Valuation allowance Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Percent Unrecognized stock-based compensation expected to be recognized over a weighted-average period Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition Gain on extinguishment of debt Gain (Loss) on Extinguishment of Debt Principal Forgiveness Principal Forgiveness [Member] Summary of Balances of Intangibles Assets and Accumulated Amortization Schedule of Finite-Lived Intangible Assets [Table Text Block] Computer equipment Computer Equipment [Member] Entity Registrant Name Entity Registrant Name Common stock shares issued and sold (shares) Stock Issued During Period, Shares, New Issues Goodwill Goodwill and Intangible Assets, Goodwill, Policy [Policy Text Block] Supplier Concentration Risk Supplier Concentration Risk [Member] Expected dividend yield Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Expected Dividend Rate Customer relationships Customer Relationships [Member] Entity Address, City or Town Entity Address, City or Town Leases [Abstract] Noncurrent portion of deferred rent Deferred Rent Credit, Noncurrent Total equity Beginning balance Ending balance Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest Net operating loss carryforwards Deferred Tax Assets, Operating Loss Carryforwards Minimum Minimum [Member] Noncontrolling interests Stockholders' Equity Attributable to Noncontrolling Interest Statement of Financial Position [Abstract] Statement of Financial Position [Abstract] Entity Emerging Growth Company Entity Emerging Growth Company Customer Two Customer Two [Member] Customer two. Common stock, par value per share Common Stock, Par or Stated Value Per Share Effect of Reorganization Transactions (shares) Stock Issued During Period Share Effect Of Reorganization Transactions Stock issued during period, share, effect of reorganization transactions. Viant Technology Inc Viant Technology Inc [Member] Viant Technology Inc. Commitments and Contingencies Disclosure [Abstract] Commitments and Contingencies Disclosure [Abstract] Treasury Stock Treasury Stock, Common [Member] Auditor Name Auditor Name Phantom Unit Plan Phantom Unit Plan [Member] Phantom unit plan. Operating loss carryforwards Operating Loss Carryforwards Trading Symbol Trading Symbol Entity File Number Entity File Number Schedule of Interest Cost Schedule Of Interest Cost Table [Table Text Block] Schedule of interest cost. Members' Equity Members Equity [Member] Members Equity. Beginning balance, treasury stock (shares) Ending balance, treasury stock (shares) Treasury Stock, Common, Shares Effect of Reorganization Transactions (shares) Temporary Equity Share Effect Of Reorganization Transactions Temporary equity, share, effect of reorganization transactions. Less: Undistributed earnings attributable to participating securities Undistributed Earnings (Loss) Allocated to Participating Securities, Basic 2026 Finite-Lived Intangible Asset, Expected Amortization, Year Four Long-term portion of deferred revenue Contract with Customer, Liability, Noncurrent Members equity units received in exchange of units Members Equity Units Received During Period Conversion Of Units Members equity units received during period conversion of units. Foreign income tax Deferred Foreign Income Tax Expense (Benefit) Research Tax Credit Carryforward Research Tax Credit Carryforward [Member] Share based payment award equity instruments other than options grants in period (shares) Granted (shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period Restricted Stock Units Restricted Stock Units (RSUs) [Member] Effective tax rate Total effective rate Effective Income Tax Rate Reconciliation, Percent Concentration Risk Benchmark Concentration Risk Benchmark [Axis] Risk-free interest rate Measurement Input, Risk Free Interest Rate [Member] Use of Estimates Use of Estimates, Policy [Policy Text Block] Advertising Agency B Advertising Agency Two [Member] Advertising agency two. Accounts payable Increase (Decrease) in Accounts Payable LIBOR Rate Loans London Interbank Offered Rate (LIBOR) Swap Rate [Member] Concentration risk, percentage Concentration Risk, Percentage Expected volatility, maximum Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Expected Volatility Rate, Maximum Income Taxes and Tax Receivable Agreement Income Tax Disclosure [Text Block] Revenue Revenue from Related Parties Operating lease weighted average incremental borrowing rate Operating Lease Weighted Average Incremental Borrowing Rate Operating lease weighted average incremental borrowing rate. State and local income tax Deferred State and Local Income Tax Expense (Benefit) Credit Facility Credit Facility [Domain] Number of supplier Number Of Supplier Number of supplier. Amortization Amortization of Intangible Assets Cash paid for interest Interest Paid, Excluding Capitalized Interest, Operating Activities Basic (dollars per share) Total earnings (loss) per Class A common stock/unit—basic (dollars per share) Earnings Per Share, Basic Allocation of equity to noncontrolling interests Stock Issued During Period Value Allocation Of Equity To Non Controlling Interests Stock issued during period, value, allocation of equity to non-controlling interests. 2025 Lessee, Operating Lease, Liability, to be Paid, Year Three Carrying value Line of Credit Facility, Maximum Amount Outstanding During Period Total fair value of RSUs, as of their respective vesting dates Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value Treasury Stock Treasury Stock Policy [Policy Text Block] Treasury stock. Concentration Risk Type Concentration Risk Type [Domain] Incentive Units Incentive Units [Member] Incentive unit. Sales and marketing Selling and Marketing Expense Total stockholders' equity attributable to Viant Technology Inc. Stockholders' Equity Attributable to Parent Cash and cash equivalents at beginning of period Cash and cash equivalents at end of period Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents, Including Disposal Group and Discontinued Operations Tax credits Tax Credit Carryforward, Amount Investment in Partnership Deferred Tax Assets, Investment in Subsidiaries Canceled/forfeited (dollars per share) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value Less: Dividend paid to common unitholders Dividends, Common Stock Line Of Credit Facility [Line Items] Line of Credit Facility [Line Items] Tax credits Deferred Tax Assets, Tax Credit Carryforwards Ownership Ownership [Domain] Other, net Deferred Tax Assets, Other Entity Interactive Data Current Entity Interactive Data Current Minority Interest [Line Items] Noncontrolling Interest [Line Items] Accumulated Amortization Finite-Lived Intangible Assets, Accumulated Amortization Schedule Of Property Plant And Equipment [Table] Property, Plant and Equipment [Table] Changes in operating assets and liabilities: Increase (Decrease) in Operating Capital [Abstract] 2025 Finite-Lived Intangible Asset, Expected Amortization, Year Three Undistributed earnings (loss) per unit—basic (dollars per share) Earnings Per Share, Basic, Undistributed Payment of member dividends Payments of Dividends Accumulated Deficit Retained Earnings [Member] Debt instrument forgiveness Debt Instrument, Decrease, Forgiveness Distribution threshold amount Share Based Compensation Arrangement By Share Based Payment Award Distribution Threshold Amount Share-based compensation arrangement by share-based payment award, distribution threshold amount. Total lease cost Lease, Cost Common Stock Common Stock [Member] Summary of Stock-based Compensation Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Table Text Block] Effect of Reorganization Transactions Stock Issued During Period Value Effect Of Reorganization Transactions Stock issued during period, value, effect of reorganization transactions. Components of Lease Expense Lease, Cost [Table Text Block] Shares remained available for grant (shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Available for Grant Technology and development Technology And Development [Member] Technology and development. Class of Stock Class of Stock [Axis] Income Taxes Income Tax, Policy [Policy Text Block] Revenue Recognition Revenue [Policy Text Block] Statement [Table] Statement [Table] Summary of Effect of Changes in Ownership Interest in Viant Technology LLC on Equity Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Table Text Block] Vested (dollars per share) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value Lessee operating lease renewal term Lessee, Operating Lease, Renewal Term Convertible preferred units, units issued (shares) Temporary Equity, Shares Issued Current assets: Assets, Current [Abstract] Long-term portion of operating lease liabilities Operating Lease, Liability, Noncurrent Net income prior to Reorganization Transactions Net Income Loss Prior To Reorganization Transactions Net income (loss) prior to reorganization transactions. Summary of Valuation Assumptions Used in Fair Value Calculation of Common Units Fair Value Measurement Inputs and Valuation Techniques [Table Text Block] Temporary equity stated value per preferred unit plus accrued return (dollars per share) Temporary Equity Stated Value Per Preferred Unit Plus Accrued Return Temporary equity stated value per preferred unit plus accrued return. Statistical Measurement Statistical Measurement [Axis] Deferred offering costs recorded in accounts payable and accrued liabilities Debt Issuance Costs Incurred During Noncash or Partial Noncash Transaction Repurchase of treasury shares in connection with the taxes paid related to net share settlement of equity awards (shares) Treasury Stock, Shares, Acquired Line of Credit Facility, Lender Line of Credit Facility, Lender [Domain] Leasehold improvements Leasehold Improvements [Member] Invoice payment terms Invoice Payment Terms, Term Invoice Payment Terms, Term Accumulated deficit Retained Earnings (Accumulated Deficit) Preferred units convertible to common units (shares) Convertible Preferred Stock, Shares Issued upon Conversion Dividend distributions payment Distribution Made to Limited Liability Company (LLC) Member, Cash Distributions Paid Accounts receivable, net of allowances Accounts Receivable, after Allowance for Credit Loss, Current Schedule Of Finite Lived Intangible Assets [Table] Schedule of Finite-Lived Intangible Assets [Table] Equity Components Equity Components [Axis] Related Parties Related Party Transactions Disclosure [Text Block] 2026 Operating Leases, Future Minimum Payments, Due in Five Years Timing of Transfer of Good or Service Timing of Transfer of Good or Service [Axis] Segment Information Segment Reporting, Policy [Policy Text Block] Comprehensive Income (Loss) Comprehensive Income, Policy [Policy Text Block] Weighted average grant date fair value of units, expired (dollars per share) Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Expirations in Period, Weighted Average Exercise Price Capitalized software development costs Capitalized Software Development Costs [Member] Capitalized software development costs. Interest expense (income), net Interest Income (Expense), Nonoperating, Net Document Fiscal Year Focus Document Fiscal Year Focus Summary of Amortization Recorded in Consolidated Statements of Operations Finite-Lived Intangible Assets Amortization Expense [Table Text Block] Tax Credit Carryforward [Axis] Tax Credit Carryforward [Axis] Total minimum payments Operating Leases, Future Minimum Payments Due Cash flows provided by (used in) operating activities: Net Cash Provided by (Used in) Operating Activities [Abstract] Statement [Line Items] Statement [Line Items] 2019 Former Holdco Transaction Two Thousand Nineteen Former Holdco Transaction [Member] 2019 former holdco transaction. Tax Receivable Agreement Tax Receivable Agreement Policy [Policy Text Block] Tax receivable agreement. RSUs outstanding, beginning balance (shares) RSUs outstanding, ending balance (shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Number Deferred Offering Costs Deferred Charges, Policy [Policy Text Block] Total other expense (income), net Nonoperating Income (Expense) Variable Rate Variable Rate [Domain] Customer One Customer One [Member] Customer One. Payments to acquire units Payments To Acquire Member Units Payments to acquire member units. Gross Amount Finite-Lived Intangible Assets, Gross 2022 Operating Leases, Future Minimum Payments Due, Next 12 Months Operating lease assets Operating Lease, Right-of-Use Asset Annual increase percentage of shares reserved for issuance Annual Increase Percentage Of Shares Reserved For Issuance Annual increase percentage of shares reserved for issuance. Auditor Firm ID Auditor Firm ID Viant Technology LLC Viant Technology L L C [Member] Viant Technology LLC. Deferred tax liabilities Deferred Tax Liabilities, Gross [Abstract] Decrease in the additional-paid-in-capital of Viant Technology Inc. resulting from ownership changes in Viant Technology LLC Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Changes, Ownership Changes Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Changes, Ownership Changes Document Transition Report Document Transition Report Local Phone Number Local Phone Number Former Holdco’s Former Holdcos [Member] Former Holdco’s. Deferred offering costs capitalized Deferred Offering Costs Summary of Stock Option/Incentive Activity Share-Based Payment Arrangement, Option, Activity [Table Text Block] Income (loss) from operations Operating Income (Loss) Recently Issued Accounting Pronouncements and Recently Adopted Accounting Pronouncements New Accounting Pronouncements, Policy [Policy Text Block] Effect of dilutive securities: Weighted Average Number of Shares Outstanding, Diluted, Adjustment [Abstract] Prepaid expenses and other assets Increase (Decrease) in Prepaid Expense and Other Assets Document Information [Table] Document Information [Table] State State and Local Jurisdiction [Member] Common stock, shares outstanding Common Stock, Shares, Outstanding Volatility Measurement Input, Option Volatility [Member] Goodwill Goodwill Weighted average exercise price, vested and exercisable (dollars per share) Share Based Compensation Arrangement By Share Based Payment Award Options Vested And Exercisable Weighted Average Exercise Price Share based compensation arrangement by share based payment award options vested and exercisable weighted average exercise price. Treasury stock, shares Treasury Stock, Shares Long-Lived Tangible Asset Long-Lived Tangible Asset [Axis] Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities: Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract] Goodwill and Intangible Assets, Net Goodwill and Intangible Assets Disclosure [Text Block] Income tax (benefit) provision Income tax expense recognized Income Tax Expense (Benefit) Deferred tax assets, valuation allowance Valuation allowance Deferred Tax Assets, Valuation Allowance Property, Equipment and Software, Net Property, Plant and Equipment, Policy [Policy Text Block] Advertising Agency Risk Advertising Agency Risk [Member] Advertising agency risk. Preferred stock, par value per share Preferred Stock, Par or Stated Value Per Share 2026 Lessee, Operating Lease, Liability, to be Paid, Year Four Income Statement [Abstract] Income Statement [Abstract] Granted (shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross Entity Public Float Entity Public Float U.S. federal income tax Deferred Federal Income Tax Expense (Benefit) Additional Paid-In Capital Additional Paid-in Capital [Member] Document Fiscal Period Focus Document Fiscal Period Focus Convertible Preferred Units And Common Units [Line Items] Convertible Preferred Units And Common Units [Line Items] Convertible preferred units and common units. Earnings (loss) per Class A common stock/unit—basic Earnings Per Share, Basic [Abstract] Preferred Unitholders Preferred Unitholders [Member] Preferred unitholders. Platform operations Cost of Goods and Services Sold Diluted (shares) Weighted-average shares of Class A common stock/units outstanding—diluted Weighted Average Number of Shares Outstanding, Diluted Expected volatility, minimum Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Expected Volatility Rate, Minimum Less: Accumulated depreciation Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment Exchange units for shares of common stock Exchange Units For Shares Of Common Stock Exchange units for shares of common stock. Cash settlement Decrease In Revenue Recognition Due To Cash Settlement For Termination Of Deferred Revenue Liabilities Decrease in revenue recognition due to cash settlement for termination of deferred revenue liabilities. Expected term (in years) Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Expected Term Collaborative Arrangement and Arrangement Other than Collaborative Collaborative Arrangement and Arrangement Other than Collaborative [Domain] Accounts Receivable, Allowance for Credit Loss [Roll Forward] Accounts Receivable, Allowance for Credit Loss [Roll Forward] Accounts Receivable Accounts Receivable [Member] ICFR Auditor Attestation Flag ICFR Auditor Attestation Flag Thereafter Operating Leases, Future Minimum Payments, Due Thereafter Less: Imputed interest Lessee Operating Lease Liability Imputed Interest Lessee operating lease liability imputed interest. Common stock, $0.001 par value Common Stock, Value, Issued Deferred rent reclassified to operating leases Reclassification Of Deferred Rent To Operating Lease Liability Reclassification of deferred rent to operating lease liability. Weighted average remaining contractual term, vested and exercisable Share Based Compensation Arrangement By Share Based Payment Award Options Vested And Exercisable Weighted Average Remaining Contractual Term Share based compensation arrangement by share based payment award options vested and exercisable weighted average remaining contractual term. Debt Instrument, Name Debt Instrument, Name [Domain] Business Acquisition, Acquiree Business Acquisition, Acquiree [Domain] Units owned (shares) Number Of Units Owned Number of units owned. Deferred tax assets Deferred Tax Assets, Gross [Abstract] Granted (dollars per share) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value Short-term lease cost Short-Term Lease, Cost Preferred stock, shares authorized (shares) Preferred Stock, Shares Authorized Vested and exercisable (shares) Share Based Compensation Arrangement By Share Based Payment Award Options Vested And Exercisable Number Of Shares Share based compensation arrangement by share based payment award options vested and exercisable number of shares. Loan Restructuring Modification Loan Restructuring Modification [Axis] Less: Net loss attributable to noncontrolling interests Net Income (Loss) Attributable to Noncontrolling Interest Commitments and Contingencies Commitments and Contingencies Disclosure [Text Block] Current liabilities: Liabilities, Current [Abstract] Net income (loss) attributable to Viant Technology Inc./common unitholders Net Income (Loss) Available to Common Stockholders, Basic Proceeds from issuance of debt Proceeds from Issuance of Long-Term Debt Common stock, shares issued Common Stock, Shares, Issued Income Tax Disclosure [Line Items] Income Tax Disclosure [Line Items] Income tax disclosure line items. Current portion of deferred revenue Contract with Customer, Liability, Current Common units, units authorized (shares) Common Unit, Authorized Historical volatility time period Historical Volatility Time Period Historical volatility time period. Capitalized assets financed by accounts payable and accrued liabilities Capital Expenditures Incurred but Not yet Paid Partner Type Partner Type [Axis] Exchange of noncontrolling interests, shares Noncontrolling Interests Number Of Shares Exchanged Noncontrolling interests, number of shares exchanged. Income Statement Location Income Statement Location [Domain] Over time Transferred over Time [Member] Schedule of Depreciation Schedule Of Depreciation Expense Table [Table Text Block] Schedule of depreciation expense. Amendment Flag Amendment Flag Operating leases for office space remaining lease terms Lessee, Operating Lease, Remaining Lease Term Net cash used in investing activities Net Cash Provided by (Used in) Investing Activities Operating lease cost Operating Lease, Cost Investment Type Investment Type [Axis] Goodwill Goodwill, Acquired During Period Impairment of other long lived assets Impairment of Long-Lived Assets to be Disposed of Entity Current Reporting Status Entity Current Reporting Status Less: Dividend paid to preferred unitholders Preferred Stock Dividends, Income Statement Impact Goodwill and Intangible Assets Disclosure [Abstract] Goodwill and Intangible Assets Disclosure [Abstract] Other current liabilities Other Liabilities, Current Class B Units Members Equity Class B Units [Member] Members equity class B units. Market Approach Valuation, Market Approach [Member] Other assets Other Assets, Noncurrent Guarantees and Indemnities Guarantees And Indemnities [Text Block] Guarantees and indemnities. 2021 LTIP Two Thousand And Twenty One Long Term Incentive Plan [Member] Two thousand and twenty one long term incentive plan. Purchases from related parties Related Party Transaction, Purchases from Related Party Nature Of Operations [Line Items] Nature Of Operations [Line Items] Nature of Operations. 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Discount for lack of marketability Measurement Input, Discount for Lack of Marketability [Member] Unrecognized stock-based compensation expected to be recognized Unrecognized stock-based compensation expected to be recognized Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount 2025 Operating Leases, Future Minimum Payments, Due in Four Years Schedules of Concentrations of Credit Risk Schedules of Concentration of Risk, by Risk Factor [Table Text Block] Property, Equipment and Software, Net Property, Plant and Equipment Disclosure [Text Block] Issuance of common stock in connection with equity-based compensation plans (shares) Stock Issued During Period, Shares, Employee Benefit Plan Change from net loss attributable to Viant Technology Inc. and transfers to noncontrolling interests Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Change Due to Net Income Attributable to Parent and Effects of Changes, Net Aggregate Intrinsic Value (in thousands) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Intrinsic Value Number of ownership interest units retired (shares) Stock Repurchased and Retired During Period, Shares Expected term Equity Securities Fv Ni Measurement Input Expected Term Equity securities FvNi measurement input expected term. 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Cover [Abstract] Cover [Abstract] Debt Instrument [Table] Schedule of Long-Term Debt Instruments [Table] Leases Lessee, Leases [Policy Text Block] Proceeds from Paycheck Protection Program Loan Proceeds From Paycheck Protection Program Loan Proceeds from paycheck protection program loan. 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