Business Acquisition Business Acquisition [Axis] Increase (Decrease) in Stockholders' Equity [Roll Forward] Increase (Decrease) in Stockholders' Equity [Roll Forward] Foreign income tax Current Foreign Tax Expense (Benefit) Lease liability Total undiscounted future lease payments Lessee, Operating Lease, Liability, to be Paid Loss before income taxes Net income (loss) Net loss Net Income (Loss), Including Portion Attributable to Noncontrolling Interest Related Party Transactions [Abstract] Related Party Transactions [Abstract] Provision for (recovery of) doubtful accounts Accounts Receivable, Credit Loss Expense (Reversal) Entity Address, Postal Zip Code Entity Address, Postal Zip Code Nature Of Operations [Table] Nature Of Operations [Table] Nature of Operations. 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 Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward] Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward] 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] Short-term lease commitment Short-Term Lease Commitment, Amount Additional paid-in capital Additional Paid in Capital 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. 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 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 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 Cumulative Effect, Period of Adoption [Axis] Cumulative Effect, Period of Adoption [Axis] 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] Gross increase based on tax positions related to current year Unrecognized Tax Benefits, Increase Resulting from Current Period Tax Positions Leases Lessee, Operating Leases [Text Block] 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] Standby Letters of Credit Standby Letters of Credit [Member] Tax Credit Carryforward, Name [Domain] Tax Credit Carryforward, Name [Domain] 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 Noncontrolling Interest [Abstract] Noncontrolling Interest [Abstract] Plan Name Plan Name [Domain] Statement of Cash Flows [Abstract] Statement of Cash Flows [Abstract] Entity Address, State or Province Entity Address, State or Province Weighted-average shares of Class A common stock outstanding—basic and diluted Undistributed Earnings Loss Attributable To All Unitholders Undistributed earnings (loss) attributable to all unitholders. Ownership Percentage Ownership Interest Percentage Ownership interest percentage. 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 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 Long-Term Debt, Excluding Current Maturities Total liabilities Liabilities Technology and development Technology And Development Expenses Technology and development expenses. 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 from 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 connection with vesting of restricted stock units Stock Issued During Period, Value, New Issues Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding 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 Temporary Equity Value Effect Of Reorganization Transactions Temporary Equity Value Effect Of Reorganization Transactions Temporary equity, value, effect of reorganization transactions. Point-in-time revenue 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] Total deferred provision Deferred Income Tax Expense (Benefit) 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 2024 Lessee, Operating Lease, Liability, to be Paid, Year One Developed technology Developed Technology Rights [Member] Affiliated Entity Affiliated Entity [Member] 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 Provision for doubtful accounts Accounts Receivable, Credit Loss Expense (Reversal), Rounding Accounts Receivable, Credit Loss Expense (Reversal), Rounding Convertible Preferred Units Convertible Preferred Stock [Member] Total assets Assets Write-offs, net of recoveries Accounts Receivable, Allowance for Credit Loss, Writeoff Debt Disclosure [Abstract] Debt Disclosure [Abstract] Supplier Supplier [Domain] Earnings (loss) per Class A common stock: 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] Contractual Obligation, to be Paid, Year One Contractual Obligation, to be Paid, Year One Numerator Net Income (Loss) Available to Common Stockholders, Basic [Abstract] 2028 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 Cumulative Effect, Period of Adoption [Domain] Cumulative Effect, Period of Adoption [Domain] Noncontrolling Interests Noncontrolling Interest Disclosure [Text Block] Loss Per Share 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] 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] Operating Lease [Domain] Operating Lease [Domain] Operating Lease [Domain] 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. Treasury stock, shares 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. Undistributed Earnings (Loss) Allocated to Participating Securities, Basic Undistributed Earnings (Loss) Allocated to Participating Securities, Basic 2027 Finite-Lived Intangible Asset, Expected Amortization, Year Four Gross increase based on tax positions related to prior years Unrecognized Tax Benefits, Increase Resulting from Prior Period Tax Positions 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] 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 Revenues Revenues 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] 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. 2026 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 Denominator 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] 2026 Finite-Lived Intangible Asset, Expected Amortization, Year Three Uncertain tax position Effective Income Tax Rate Reconciliation, Tax Contingency, Percent Undistributed earnings (loss) per unit—basic (dollars per share) Earnings Per Share, Basic, Undistributed 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] Money market funds Money Market Funds, at Carrying Value Summary of Stock-based Compensation Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Table Text Block] Stock Issued During Period Value 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 Current assets: Assets, Current [Abstract] Long-term portion of operating lease liabilities Operating Lease, Liability, Noncurrent Net Income Loss Prior To Reorganization Transactions Net Income Loss Prior To Reorganization Transactions Net income (loss) prior to reorganization transactions. Statistical Measurement Statistical Measurement [Axis] 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) 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] 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] Cash flows from operating activities: Net Cash Provided by (Used in) Operating Activities [Abstract] Statement [Line Items] Statement [Line Items] 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. Expenses incurred Selling, General and Administrative Expense Gross Amount Finite-Lived Intangible Assets, Gross Total current provision Current Income Tax Expense (Benefit) 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 Deferred offering costs capitalized Deferred Offering Costs Summary of Stock Option/Incentive Activity Share-Based Payment Arrangement, Option, Activity [Table Text Block] Loss from operations Operating Income (Loss) Contractual Obligation, to be Paid, Year Two Contractual Obligation, to be Paid, Year Two Recently Issued Accounting Pronouncements and Recently Adopted Accounting Pronouncements New Accounting Pronouncements, Policy [Policy Text Block] Restricted stock units 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 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. Long-Lived Tangible Asset Long-Lived Tangible Asset [Axis] Adjustments to reconcile net 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] Provision for income taxes Income tax (benefit) provision 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 2027 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 Earnings Per Share, Basic [Abstract] Earnings Per Share, Basic [Abstract] Platform operations Cost of Goods and Services Sold Diluted (shares) Shares of Class B common stock 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 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. Contractual Obligation, to be Paid, Year Three Contractual Obligation, to be Paid, Year Three 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] Loss per share of Class A common stock—diluted Net Income (Loss) Available to Common Stockholders, Basic Proceeds from issuance of debt Proceeds from Issuance of Long-Term Debt Proceeds from the exercise of stock options Proceeds from Stock Options Exercised 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 Capitalized assets financed by accounts payable and accrued liabilities Capital Expenditures Incurred but Not yet Paid 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 revenue Transferred over Time [Member] Schedule of Depreciation Schedule Of Depreciation Expense Table [Table Text Block] Schedule of depreciation expense. Accrued liabilities Accrued Liabilities 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 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: Net loss attributable to noncontrolling interests 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. Other assets Other Assets, Noncurrent 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. Security deposit Security Deposit Depreciation and amortization Depreciation, Depletion and Amortization Disaggregation Of Revenue [Table] Disaggregation of Revenue [Table] Facility fee for undrawn amounts Line of Credit Facility, Unused Capacity, Commitment Fee Percentage Contract with Customer, Duration Contract with Customer, Duration [Axis] U.S. statutory federal income tax rate Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent Thereafter Finite-Lived Intangible Asset, Expected Amortization, after Year Five Loss before income taxes Income (Loss), Including Portion Attributable to Noncontrolling Interest, before Tax Adelphic Adelphic [Member] Adelphic. Reissuance of treasury stock in connection with equity-based compensation plans Stock Issued During Period, Value, Treasury Stock Reissued Expected Duration of Greater Than One Year Long-Term Contract with Customer [Member] Related Party Relationships Related Party Relationships Policy [Policy Text Block] Related party relationships. Beginning balance (shares) Ending balance (shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Number Stock-based compensation Effective Income Tax Rate Reconciliation, Nondeductible Expense, Share-Based Payment Arrangement, Percent IPO IPO [Member] Entity Incorporation, State or Country Code Entity Incorporation, State or Country Code State and local taxes, net of federal benefit Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Percent Share-Based Compensation Arrangement by Share-Based Payment Award, Non-Option Equity Instruments, Outstanding [Roll Forward] Share-Based Compensation Arrangement by Share-Based Payment Award, Non-Option Equity Instruments, Outstanding [Roll Forward] Liabilities Liabilities [Abstract] Property, equipment, and software, net Total property, equipment, and software, net Property, Plant and Equipment, Net Cash paid for amounts included in operating lease liabilities Operating Lease, Payments Summary of Estimated Future Amortization of Intangible Assets Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block] Basis of Presentation and Principles of Consolidation Basis Of Presentation And Principles Of Consolidation Policy [Policy Text Block] Basis of presentation and principles of consolidation. Sales and marketing Selling and Marketing Expense [Member] Treasury stock, at cost; 153,875 and 140,088 shares held Treasury Stock, Value Expected volatility Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Expected Volatility Rate Effect of Reorganization Transactions Dividends Beginning balance Ending balance Accounts Receivable, Allowance for Credit Loss, Current Number of customer Number Of Customer Number of customer. 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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 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 Long-Lived Tangible Asset Long-Lived Tangible Asset [Domain] Tax receivable agreement expected remaining tax benefit percentage Tax Receivable Agreement Expected Remaining Tax Benefit Percentage Tax receivable agreement expected remaining tax benefit percentage. 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Cash and cash equivalents Cash Earnings Per Share, Diluted [Abstract] Earnings Per Share, Diluted [Abstract] Organization, Consolidation and Presentation of Financial Statements [Abstract] Organization, Consolidation and Presentation of Financial Statements [Abstract] Subtotal Deferred Tax Assets, Gross Reissuance of treasury stock in connection with equity-based compensation plans (shares) Stock Issued During Period, Shares, Treasury Stock Reissued Common stock shares issued for each membership unit (share) Common Stock Shares Issued For Each Membership Unit Common stock shares issued for each membership unit. Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items] Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] Nonqualified Stock Options Nonqualified Stock Options [Member] Nonqualified stock options. Current Fiscal Year End Date Current Fiscal Year End Date Accrued Liabilities Accounts Payable and Accrued Liabilities Disclosure [Text Block] Furniture, fixtures and office equipment Furniture Fixtures And Office Equipment [Member] Furniture, fixtures and office equipment. Finite Lived Intangible Assets [Line Items] Finite-Lived Intangible Assets [Line Items] Diluted (dollars per share) Total earnings (loss) per Class A common stock/unit—diluted (dollars per share) Earnings Per Share, Diluted Sale of Stock Sale of Stock [Domain] Trademarks/tradenames Trademarks and Trade Names [Member] Vesting period Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period Payments of stock issuance costs Payments of Stock Issuance Costs Percentage of interest held Percentage of economic interest held Noncontrolling Interest, Ownership Percentage by Parent Stock-based compensation APIC, Share-Based Payment Arrangement, Increase for Cost Recognition Accounting Standards Update 2016-13 Accounting Standards Update 2016-13 [Member] Income tax expense Income Tax Expense (Benefit), Rounding Income Tax Expense (Benefit), Rounding Concentration Risk Type Concentration Risk Type [Axis] Total current liabilities Liabilities, Current Risk free interest rate, minimum Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Risk Free Interest Rate, Minimum Basis Of Presentation And Summary Of Significant Accounting Policies [Abstract] Basis Of Presentation And Summary Of Significant Accounting Policies [Abstract] Basis of Presentation and Summary of Significant Accounting Policies. 2025 Lessee, Operating Lease, Liability, to be Paid, Year Two Customer Concentration Risk Customer Concentration Risk [Member] Beginning balance of unrecognized tax benefits Ending balance of unrecognized tax benefits Unrecognized Tax Benefits Paycheck Protection Program Loan Paycheck Protection Program Loan [Member] Paycheck Protection Program Loan. 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Undrawn availability Line Of Credit Facility, Undrawn Availability Percentage Line Of Credit Facility, Undrawn Availability Percentage Stock-based compensation included in capitalized software development costs Share-Based Payment Arrangement, Amount Capitalized Underwriters Over-Allotment Option [Member] SOFR Secured Overnight Financing Rate S O F R [Member] Secured Overnight Financing Rate (SOFR). Class of Stock Class of Stock [Domain] Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Vested and Expected to Vest, Exercisable, Aggregate Intrinsic Value Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Vested and Expected to Vest, Exercisable, Aggregate Intrinsic Value Current portion of deferred rent Deferred Rent Credit, Current Ownership percentage by non-controlling interests Economic Interests Ownership Percentage Economic interests ownership percentage. Credit Facility Credit Facility [Axis] Platform operations Platform Operations [Member] Platform operations. Summary of Accrued Liabilities Schedule of Accrued Liabilities [Table Text Block] Vested (shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period Entity Tax Identification Number Entity Tax Identification Number Equity incentive plan number of units, authorized (shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Authorized PNC Bank P N C Bank [Member] PNC Bank. Advertising costs Advertising Expense Summary of Disaggregation of Revenue Disaggregation of Revenue [Table Text Block] Total deferred tax liabilities Deferred Tax Liabilities, Gross Common stock voting rights percentage Common Stock Voting Rights Percentage Common stock voting rights percentage. 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Net increase (decrease) in cash and cash equivalents Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect Issuance of Class A common stock in connection with vesting of restricted stock units Stock Issued During Period, Value, Employee Benefit Plan Impairment of Long-Lived Assets Impairment or Disposal of Long-Lived Assets, Including Intangible Assets, Policy [Policy Text Block] Payment of member tax distributions Payment Of Member Tax Distributions Payment of member tax distributions. 2028 Finite-Lived Intangible Asset, Expected Amortization, Year Five Entity Central Index Key Entity Central Index Key Antidilutive Securities, Name Antidilutive Securities, Name [Domain] Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract] Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract] Finite-Lived Intangible Assets by Major Class Finite-Lived Intangible Assets by Major Class [Axis] Schedule Of Share Based Compensation Arrangements By Share Based Payment Award [Table] Schedule of Share-Based Compensation Arrangements by Share-Based Payment Award [Table] Exchange of Class B common stock for Class A common stock (shares) Stock Issued During Period, Shares, Conversion of Units Concentration of Risk Concentration Risk, Credit Risk, Policy [Policy Text Block] Other accrued liabilities Other Accrued Liabilities, Current Entity Entity [Domain] City Area Code City Area Code Cumulative impact of accounting adoption Accounts Receivable, Allowance for Credit Loss, Period Increase (Decrease) Assets Assets [Abstract] General and administrative General and Administrative Expense Impairment of intangible assets Impairment of Intangible Assets (Excluding Goodwill) Operating Expenses Selling, General and Administrative Expenses, Policy [Policy Text Block] Statement of Stockholders' Equity [Abstract] Statement of Stockholders' Equity [Abstract] Sale of Stock Sale of Stock [Axis] Unpaid expenses Due to Related Parties, Current Cash flows from financing activities: Net Cash Provided by (Used in) Financing Activities [Abstract] Meredith Corporation Meredith Corporation [Member] Meredith Corporation. Earnings (Loss) Per Share Earnings Per Share, Policy [Policy Text Block] Supplemental disclosure of non-cash investing and financing activities: Cash Flow, Noncash Investing and Financing Activities Disclosure [Abstract] Stock-based compensation Share-Based Payment Arrangement, Noncash Expense Weighted-average grant-date fair value of stock options granted (shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value Variable Rate Variable Rate [Axis] Other liabilities Increase (Decrease) in Other Operating Liabilities Purchases of property and equipment Payments to Acquire Property, Plant, and Equipment Disaggregation Of Revenue [Line Items] Disaggregation of Revenue [Line Items] 2024 Finite-Lived Intangible Asset, Expected Amortization, Year One Calculation of Basic and Diluted Net Earnings (Loss) Per Share/Unit Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] Operating lease assets obtained in exchange for operating lease liabilities Right-of-Use Asset Obtained in Exchange for Operating Lease Liability Customer Customer [Domain]