Accumulated Amortization Finite-Lived Intangible Assets, Accumulated Amortization Statistical Measurement Statistical Measurement [Domain] Thereafter Lessee, Operating Lease, Liability, to be Paid, after Year Five Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Aggregate Intrinsic Value [Abstract] Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Aggregate Intrinsic Value [Abstract] Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Aggregate Intrinsic Value Award Timing Predetermined Award Timing Predetermined [Flag] Remainder of 2026 Lessee, Operating Lease, Liability, to be Paid, Remainder of Fiscal Year Entity File Number Entity File Number Additional Paid-In Capital Additional Paid-in Capital [Member] Tabular List, Table Tabular List [Table Text Block] Leases [Abstract] Leases [Abstract] Business Combination, Consideration Transferred, Equity Interest, Share Issued, Number of Shares Business Combination, Consideration Transferred, Equity Interest, Share Issued, Number of Shares Recently Issued and Recent Adopted Accounting Pronouncements New Accounting Pronouncements, Policy [Policy Text Block] Accounts payable Increase (Decrease) in Accounts Payable Interest income, net Interest Income (Expense), Nonoperating Fixed coverage charge ratio Line Of Credit Facility, Fixed Coverage Charge Ratio Line Of Credit Facility, Fixed Coverage Charge Ratio Accrued compensation Increase Decrease In Accrued Compensation Increase decrease in Accrued compensation. Trading Arrangements, by Individual Trading Arrangements, by Individual [Table] Domestic Rate Loans Fed Funds Effective Rate Overnight Index Swap Rate [Member] Basic (USD per share) Earnings Per Share, Basic Adjustment to Compensation: Adjustment to Compensation [Axis] Named Executive Officers, Footnote Named Executive Officers, Footnote [Text Block] Revenue Revenue from Contract with Customer [Text Block] Revenue for unsatisfied performance obligation expected to be recognized in the future, amount Revenue, Remaining Performance Obligation, Amount Adjustment to Compensation, Amount Adjustment to Compensation Amount Affiliated Entity Affiliated Entity [Member] Concentration risk, percentage Concentration Risk, Percentage Stock-based compensation Share-Based Payment Arrangement, Noncash Expense 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. Employee Stock Option Share-Based Payment Arrangement, Option [Member] Award Timing MNPI Disclosure Award Timing MNPI Disclosure [Text Block] Schedule Of Property Plant And Equipment [Table] Property, Plant and Equipment [Table] Cash and Cash Equivalents Cash and Cash Equivalents, Policy [Policy Text Block] Schedule of Accounts, Notes, Loans and Financing Receivable [Table] Accounts and Financing Receivables [Table] Antidilutive Securities Antidilutive Securities [Axis] Total stockholders’ equity attributable to Viant Technology Inc. Equity, Attributable to Parent Secured Overnight Financing Rate Secured Overnight Financing Rate [Member] Secured Overnight Financing Rate Accrued member tax distributions Accrued Member Tax Distributions Accrued member tax distributions. Insider Trading Policies and Procedures [Line Items] Stock-based compensation expense Share-Based Payment Arrangement, Expense Schedule of Major Classes of Property, Equipment and Software Property, Plant and Equipment [Table Text Block] Common stock, shares authorized (shares) Common Stock, Shares Authorized Goodwill and Intangible Assets Disclosure [Abstract] Goodwill and Intangible Assets Disclosure [Abstract] Issuance of Class A common stock in connection with equity-based compensation plans (shares) Stock Issued During Period, Shares, Employee Benefit Plan Transfers to noncontrolling interests: Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Changes, Net [Abstract] Current assets: Assets, Current [Abstract] Canceled (shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Forfeitures in Period Total liabilities and stockholders’ equity Liabilities and Equity Minority Interest [Line Items] Noncontrolling Interest [Line Items] Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding [Roll Forward] Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding [Roll Forward] Concentration Risk Benchmark Concentration Risk Benchmark [Axis] Concentration of Risk Concentration Risk, Credit Risk, Policy [Policy Text Block] Cash and cash equivalents at beginning of period Cash and cash equivalents at end of period Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Including Discontinued Operation Liabilities and stockholders’ equity Liabilities and Equity [Abstract] Loan Agreement Loan Agreement [Member] Loan agreement. Maximum Maximum [Member] General and administrative General and Administrative Expense [Member] Less: Net loss attributable to noncontrolling interests Net Income (Loss) Attributable to Noncontrolling Interest Accounting Policies [Abstract] Intangible assets, net Net Carrying Amount Finite-Lived Intangible Assets, Net Summary of Future Minimum Lease Payments Lessee, Operating Lease, Liability, to be Paid, Maturity [Table Text Block] Concentration Risk Type Concentration Risk Type [Domain] Non-PEO NEO Average Total Compensation Amount Non-PEO NEO Average Total Compensation Amount Schedule Of Share Based Compensation Arrangements By Share Based Payment Award [Table] Schedule of Share-Based Compensation Arrangements by Share-Based Payment Award [Table] Treasury Stock Treasury Stock, Common [Member] Adjustment to Non-PEO NEO Compensation Footnote Adjustment to Non-PEO NEO Compensation Footnote [Text Block] Pay vs Performance Disclosure [Line Items] Present value of operating lease liabilities Operating Lease, Liability Forgone Recovery due to Disqualification of Tax Benefits, Amount Forgone Recovery due to Disqualification of Tax Benefits, Amount Line of Credit Facility, Lender Line of Credit Facility, Lender [Domain] Liabilities Liabilities [Abstract] Accrued compensation Accrued Salaries, Current Non-Rule 10b5-1 Arrangement Terminated Non-Rule 10b5-1 Arrangement Terminated [Flag] Ownership Percentage Ownership Interest Percentage Ownership interest percentage. Entity Shell Company Entity Shell Company Deferred revenue Increase (Decrease) in Deferred Revenue Statement of Stockholders' Equity [Abstract] Statement of Stockholders' Equity [Abstract] Operating Segments Operating Segments [Member] Stock-based compensation included in capitalized software development costs Share-Based Payment Arrangement, Amount Capitalized Operating leases for office space remaining lease terms Lessee, Operating Lease, Remaining Lease Term Statement of Cash Flows [Abstract] Statement of Cash Flows [Abstract] Company Selected Measure Amount Company Selected Measure Amount 2029 Lessee, Operating Lease, Liability, to be Paid, Year Three Accounts Payable and Accrued Liabilities Accounts Payable And Accrued Liabilities Current [Member] Accounts payable and accrued liabilities current. Award Timing MNPI Considered Award Timing MNPI Considered [Flag] Line Of Credit Facility [Table] Line of Credit Facility [Table] Expired (USD per share) Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Expirations in Period, Weighted Average Exercise Price Name Measure Name 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] Summary of Stock-based Compensation Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Table Text Block] Current portion of operating lease liabilities Less: Operating lease liabilities, current Operating Lease, Liability, Current Purchased software Software and Software Development Costs [Member] Document Fiscal Period Focus Document Fiscal Period Focus Technology and development Technology And Development Expenses Technology and development expenses. Award Timing Method Award Timing Method [Text Block] Award Type Award Type [Axis] Supplier One Supplier One [Member] Supplier one. Legal Entity Legal Entity [Axis] Total assets Assets 2027 Finite-Lived Intangible Asset, Expected Amortization, Year One Trading Symbol Trading Symbol 2030 Lessee, Operating Lease, Liability, to be Paid, Year Four Vested (USD 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 Summary Ownership of Viant Technology LLC Schedule Of Noncontrolling Ownership Interests Table [Table Text Block] Schedule of noncontrolling ownership interests. Entity Address, City or Town Entity Address, City or Town Cash flows from operating activities: Cash Provided by (Used in) Operating Activity, Including Discontinued Operation [Abstract] Remaining Weighted-Average Useful Life (years) Acquired Finite-Lived Intangible Assets, Weighted Average Useful Life Intangible Assets, Net Intangible Assets Disclosure [Text Block] Concentration Risk Type Concentration Risk Type [Axis] Non-PEO NEO Average Compensation Actually Paid Amount Non-PEO NEO Average Compensation Actually Paid Amount Restricted Stock Units Restricted Stock Units (RSUs) [Member] Income Statement Location Statement of Income Location, Balance [Domain] Compensation Actually Paid vs. Other Measure Compensation Actually Paid vs. Other Measure [Text Block] 2030 Finite-Lived Intangible Asset, Expected Amortization, Year Four Entity Emerging Growth Company Entity Emerging Growth Company Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding Number of Options outstanding, beginning balance (shares) Number of Options outstanding, ending balance (shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Number Change in Fair Value as of Vesting Date of Prior Year Equity Awards Vested in Covered Year Change in Fair Value as of Vesting Date of Prior Year Equity Awards Vested in Covered Year [Member] Remaining contractual obligation, short-term leases Short-Term Lease Commitment, Amount Insider Trading Policies and Procedures Not Adopted Insider Trading Policies and Procedures Not Adopted [Text Block] Business Combination [Domain] Business Combination [Domain] Common stock, shares outstanding (shares) Common Stock, Shares, Outstanding Provision for doubtful accounts Accounts Receivable, Credit Loss Expense (Reversal) LTIP Long Term Incentive Plan [Member] Long Term Incentive Plan. Plan Name Plan Name [Axis] Document Information [Table] Document Information [Table] PEO PEO [Member] Summary of Disaggregation of Revenue Disaggregation of Revenue [Table Text Block] Changes in operating assets and liabilities: Adjustment to Reconcile Net Income to Cash Provided by (Used in) Operating Activity, Increase (Decrease) in Operating Capital [Abstract] Dividends or Other Earnings Paid on Equity Awards not Otherwise Reflected in Total Compensation for Covered Year Dividends or Other Earnings Paid on Equity Awards not Otherwise Reflected in Total Compensation for Covered Year [Member] Summary of Estimated Future Amortization of Intangible Assets Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block] Accumulated Deficit Retained Earnings [Member] Prepaid expenses and other current assets Prepaid Expense and Other Assets, Current Summary of Accrued Liabilities Schedule of Accrued Liabilities [Table Text Block] Entity Address, Postal Zip Code Entity Address, Postal Zip Code Restatement Determination Date Restatement Determination Date Share-Based Payment Arrangement [Abstract] Share-Based Payment Arrangement [Abstract] Income Statement [Abstract] Income Statement [Abstract] Provision for (benefit from) income taxes Income Tax Expense (Benefit) Debt instrument, basis spread on variable rate plus margin Debt Instrument, Basis Spread on Variable Rate Class B Common Stock Common Class B [Member] Document Information [Line Items] Document Information [Line Items] Preferred stock, shares issued (shares) Preferred Stock, Shares Issued Pension Adjustments Service Cost Pension Adjustments Service Cost [Member] Customer Concentration Risk Customer Concentration Risk [Member] Total property, equipment, and software Property, Plant and Equipment, Gross Share-Based Payment Arrangement, Performance Shares, Outstanding Activity Share-Based Payment Arrangement, Performance Shares, Outstanding Activity [Table Text Block] TRA remeasurement expense Tax Receivable Agreement Remeasurement Expense Tax Receivable Agreement Remeasurement Expense Net loss Net loss Net loss Net Income (Loss), Including Portion Attributable to Noncontrolling Interest Restatement does not require Recovery Restatement Does Not Require Recovery [Text Block] Organization, Consolidation and Presentation of Financial Statements [Abstract] Organization, Consolidation and Presentation of Financial Statements [Abstract] Noncash lease expense Operating Lease, Right-of-Use Asset, Periodic Reduction Compensation Actually Paid vs. Company Selected Measure Compensation Actually Paid vs. Company Selected Measure [Text Block] Proceeds from the exercise of stock options Proceeds from Stock Options Exercised City Area Code City Area Code Cash paid for acquisitions Payments to Acquire Businesses, Net of Cash Acquired Award Timing, How MNPI Considered Award Timing, How MNPI Considered [Text Block] All Trading Arrangements All Trading Arrangements [Member] Equity Awards Adjustments, Footnote Equity Awards Adjustments, Footnote [Text Block] Total Shareholder Return Vs Peer Group Total Shareholder Return Vs Peer Group [Text Block] Accrued liabilities Total accrued liabilities Accrued Liabilities, Current Capitalized software development costs Payments to Develop Software 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 Commitments and Contingencies Disclosure [Abstract] Commitments and Contingencies Disclosure [Abstract] Cash flows from investing activities: Cash Provided by (Used in) Investing Activity, Including Discontinued Operation [Abstract] General and administrative General and Administrative Expense Pay vs Performance Disclosure Pay vs Performance Disclosure [Table] Net cash provided by (used in) operating activities Cash Provided by (Used in) Operating Activity, Including Discontinued Operation Contract with Customer, Duration Contract with Customer, Duration [Axis] Supplier Supplier [Axis] Retirement of treasury stock Treasury Stock, Retired, Cost Method, Amount Preferred stock, par value (USD per share) Preferred Stock, Par or Stated Value Per Share Subsequent Event Subsequent Event [Member] Total lease cost Lease, Cost Goodwill Goodwill Equity Valuation Assumption Difference, Footnote Equity Valuation Assumption Difference, Footnote [Text Block] Components of Lease Expense Lease, Cost [Table Text Block] PEO Total Compensation Amount PEO Total Compensation Amount Depreciation Depreciation Customer Two Customer Two [Member] Customer Two Viant Technology Inc. Viant Technology Inc [Member] Viant Technology Inc. Remainder of 2026 Finite-Lived Intangible Asset, Expected Amortization, Remainder of Fiscal Year Equity Components Equity Components [Axis] Entity Ex Transition Period Entity Ex Transition Period Property Plant And Equipment [Line Items] Property, Plant and Equipment [Line Items] Nature of Operations Nature of Operations [Text Block] Non-Rule 10b5-1 Arrangement Adopted Non-Rule 10b5-1 Arrangement Adopted [Flag] Number of reportable segments Number of Reportable Segments Expired (shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Expirations in Period Supplemental disclosure of cash flow information: Supplemental Cash Flow Information [Abstract] Reissuance of treasury stock Stock Issued During Period, Value, Treasury Stock Reissued Other Performance Measure, Amount Other Performance Measure, Amount Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract] Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract] Entity Address, State or Province Entity Address, State or Province Related Party [Domain] Related and Nonrelated Parties [Domain] Total current liabilities Liabilities, Current Individual: Individual [Axis] Entity Entity [Domain] Operating lease weighted average incremental borrowing rate Operating Lease Weighted Average Incremental Borrowing Rate Operating lease weighted average incremental borrowing rate. Net cash used in investing activities Cash Provided by (Used in) Investing Activity, Including Discontinued Operation Aggregate Change in Present Value of Accumulated Benefit for All Pension Plans Reported in Summary Compensation Table Aggregate Change in Present Value of Accumulated Benefit for All Pension Plans Reported in Summary Compensation Table [Member] Cash paid for interest Interest Paid, Excluding Capitalized Interest, Operating Activity Document Fiscal Year Focus Document Fiscal Year Focus Lender Name Lender Name [Axis] Operating lease assets, net Operating Lease, Right-of-Use Asset Forgone Recovery, Explanation of Impracticability Forgone Recovery, Explanation of Impracticability [Text Block] 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. Ownership percentage by Viant Technology Inc. Subsidiary, Ownership Percentage, Noncontrolling Owner Effective tax rate Effective Income Tax Rate Reconciliation, Percent Entity Interactive Data Current Entity Interactive Data Current Schedule of Traffic Acquisition Costs Deferred Policy Acquisition Costs [Table Text Block] Operating lease cost Operating Lease, Cost Plan Name Plan Name [Domain] 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 Tax receivable agreement liability and deferred taxes arising from exchanges or remeasurements Tax Receivable Liability And Deferred Taxes Arising From Exchanges Or Remeasurements Tax Receivable Liability And Deferred Taxes Arising From Exchanges Or Remeasurements Exercised (shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercises in Period TRA liability Tax Receivable Agreement Liability Tax receivable agreement liability. Operating lease assets obtained in exchange for operating lease liabilities including adjustments Right-of-Use Asset Obtained in Exchange for Operating Lease Liability, Net Of Adjustments Right-of-Use Asset Obtained in Exchange for Operating Lease Liability, Net Of Adjustments Disaggregation Of Revenue [Table] Disaggregation of Revenue [Table] Long-Lived Tangible Asset Long-Lived Tangible Asset [Axis] Increase (Decrease) in Stockholders' Equity [Roll Forward] Increase (Decrease) in Stockholders' Equity [Roll Forward] Finite Lived Intangible Assets [Line Items] Finite-Lived Intangible Assets [Line Items] Ownership Ownership [Domain] Compensation Actually Paid vs. Total Shareholder Return Compensation Actually Paid vs. Total Shareholder Return [Text Block] Amortization of intangible assets Amortization of Intangible Assets Deferred tax assets Deferred Income Tax Assets, Net Repurchase of stock related to the stock repurchase program Stock Repurchased During Period, Value Depreciation and amortization Depreciation, Depletion and Amortization Technology and development Technology And Development [Member] Technology and development. Other assets Other Assets, Noncurrent Customer Customer [Domain] Entity Central Index Key Entity Central Index Key PEO Name PEO Name Prior Year End Fair Value of Equity Awards Granted in Any Prior Year that Fail to Meet Applicable Vesting Conditions During Covered Year Prior Year End Fair Value of Equity Awards Granted in Any Prior Year that Fail to Meet Applicable Vesting Conditions During Covered Year [Member] Outstanding Aggregate Erroneous Compensation Amount Outstanding Aggregate Erroneous Compensation Amount Revolving Credit Facility Revolving Credit Facility [Member] Accounts Receivable, Net of Allowances Accounts Receivable [Policy Text Block] Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term [Abstract] Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term [Abstract] Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term Arrangement Duration Trading Arrangement Duration Document - Document and Entity Information [Abstract] Document Document And Entity Information [Abstract] Document Document And Entity Information [Abstract] Computer equipment Computer Equipment [Member] Deferred revenue Contract with Customer, Liability, Current Segments [Axis] Segments [Axis] Prepaid expenses and other assets Increase (Decrease) in Prepaid Expense and Other Assets Exercise Price Award Exercise Price Entity Filer Category Entity Filer Category Local Phone Number Local Phone Number Class of Stock Class of Stock [Domain] Additional 402(v) Disclosure Additional 402(v) Disclosure [Text Block] U.S. statutory federal income tax rate Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent Subsequent Event Type [Axis] Subsequent Event Type [Axis] Stock-Based Compensation Share-Based Payment Arrangement [Text Block] Capitalized software development costs Capitalized Software Development Costs [Member] Capitalized software development costs. Assets Assets [Abstract] Long-term debt Long-Term Debt, Excluding Current Maturities Credit Facility Credit Facility [Axis] Underlying Security Market Price Change Underlying Security Market Price Change, Percent 2029 Finite-Lived Intangible Asset, Expected Amortization, Year Three Payment on tax receivable agreement liability Payment For Tax Receivable Agreement Liability Payment For Tax Receivable Agreement Liability Debt Instrument Debt Instrument [Axis] Canceled/forfeited (USD per share) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value Repurchase of stock related to the stock repurchase program Payment, Tax Withholding, Share-Based Payment Arrangement, Share Repurchase Program Payment, Tax Withholding, Share-Based Payment Arrangement, Share Repurchase Program Credit Facility Credit Facility [Domain] Gross Amount Finite-Lived Intangible Assets, Gross Stockholders’ equity Equity, Attributable to Parent [Abstract] Customer One Customer One [Member] Customer One Vesting Date Fair Value of Equity Awards Granted and Vested in Covered Year Vesting Date Fair Value of Equity Awards Granted and Vested in Covered Year [Member] Entity Address, Address Line One Entity Address, Address Line One Entity Address, Address Line Two Entity Address, Address Line Two Repurchase of stock related to tax withholdings on vested equity awards Treasury Stock, Value, Acquired, Cost Method Beginning balance Ending balance Accounts Receivable, Allowance for Credit Loss, Current Long-term portion of operating lease liabilities Operating Lease, Liability, Noncurrent Exchange (cancellation) of shares (shares) Stock Issued During Period, Shares, Conversion of Convertible Securities Viant Technology LLC Viant Technology L L C [Member] Viant Technology LLC. Ownership Ownership [Axis] 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 Fair Value as of Grant Date Award Grant Date Fair Value Property, Plant and Equipment [Abstract] Property, Plant and Equipment [Abstract] Entity Registrant Name Entity Registrant Name Thereafter Finite-Lived Intangible Asset, Expected Amortization, After Year Four Finite-Lived Intangible Asset, Expected Amortization, After Year Four Stock Price or TSR Estimation Method Stock Price or TSR Estimation Method [Text Block] Earnings Per Share, Diluted, by Common Class, Including Two-Class Method [Table] Earnings Per Share, Diluted, by Common Class, Including Two-Class Method [Table] Vested and exercisable (USD 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. Share based payment award equity instruments other than options grants in period Granted (shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period Title and Position [Domain] Title and Position [Domain] Total operating expenses Expense incurred Costs and Expenses Canceled/forfeited (shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Forfeited in Period Unrecognized stock-based compensation expected to be recognized Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount Related Party Transaction [Line Items] Related Party Transaction [Line Items] Document Quarterly Report Document Quarterly Report Changed Peer Group, Footnote Changed Peer Group, Footnote [Text Block] 2028 Lessee, Operating Lease, Liability, to be Paid, Year Two Adjustment To PEO Compensation, Footnote Adjustment To PEO Compensation, Footnote [Text Block] 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 Weighted-Average Remaining Contractual Term (years) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term Contractual obligations, remainder of 2023 Contractual Obligation, to be Paid, Remainder of Fiscal Year Granted (USD 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 Related Party [Axis] Related and Nonrelated Parties [Axis] Title Trading Arrangement, Individual Title Peer Group Total Shareholder Return Amount Peer Group Total Shareholder Return Amount Exchange units for shares of common stock (shares) Exchange Units For Shares Of Common Stock Exchange units for shares of common stock. Summary of Balances of Intangible Assets and Accumulated Amortization Schedule of Finite-Lived Intangible Assets [Table Text Block] Restatement Determination Date: Restatement Determination Date [Axis] Payments to Acquire Businesses, Gross Payments to Acquire Businesses, Gross Non-PEO NEO Non-PEO NEO [Member] Aggregate Intrinsic Value Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Intrinsic Value Accounts Receivable Accounts Receivable [Member] Less: Imputed interest Lessee Operating Lease Liability Imputed Interest Lessee operating lease liability imputed interest. Name Trading Arrangement, Individual Name Exchange of Class B common stock for Class A common stock Stock Issued During Period, Value, Conversion of Units Award Type Award Type [Domain] 2027 Lessee, Operating Lease, Liability, to be Paid, Year One Weighted-Average Remaining Contractual Term of Options, 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. Noncontrolling interests Equity, Attributable to Noncontrolling Interest Equity Awards Adjustments Equity Awards Adjustments [Member] Share repurchase program, additional authorized, amount Share Repurchase Program, Additional Authorized, Amount Share Repurchase Program, Additional Authorized, Amount Leasehold improvements Leasehold Improvements [Member] Pension Benefits Adjustments, Footnote Pension Benefits Adjustments, Footnote [Text Block] Units Owned (shares) Number Of Units Owned Number of units owned. Disaggregation Of Revenue [Line Items] Disaggregation of Revenue [Line Items] Compensation Amount Outstanding Recovery Compensation Amount Debt Instrument, Name Debt Instrument, Name [Domain] Recovery of Erroneously Awarded Compensation Disclosure [Line Items] Business Combination, Consideration Transferred, Equity Interest Business Combination, Consideration Transferred, Equity Interest Summary of Changes in Allowance for Doubtful Accounts Accounts Receivable, Allowance for Credit Loss [Table Text Block] MNPI Disclosure Timed for Compensation Value MNPI Disclosure Timed for Compensation Value [Flag] 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. Name Awards Close in Time to MNPI Disclosures, Individual Name Weighted-Average Grant-Date Fair Value of RSUs outstanding, beginning balance (USD per share) Weighted-Average Grant-Date Fair Value of RSUs outstanding, ending balance (USD per share) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value Aggregate Erroneous Compensation Not Yet Determined Aggregate Erroneous Compensation Not Yet Determined [Text Block] Reissuance of treasury stock in connection with equity-based compensation plans (shares) Stock Issued During Period, Shares, Treasury Stock Reissued Stock-based compensation APIC, Share-Based Payment Arrangement, Increase for Cost Recognition Treasury stock, at cost; 555,502 and 678,095 shares held Treasury Stock, Value Expected Duration of Greater Than One Year Long-Term Contract with Customer [Member] Noncontrolling Interests Number Of Shares Exchanged Noncontrolling Interests Number Of Shares Exchanged Noncontrolling interests, number of shares exchanged. Schedule of Depreciation Schedule Of Depreciation Expense Table [Table Text Block] Schedule of depreciation expense. Sales and marketing Selling and Marketing Expense Segments [Domain] Segments [Domain] Income Statement Location Statement of Income Location, Balance [Axis] Performance Shares Performance Shares [Member] Aggregate Pension Adjustments Service Cost Aggregate Pension Adjustments Service Cost [Member] Developed technology Developed Technology Rights [Member] Finite-Lived Intangible Assets by Major Class Finite-Lived Intangible Assets by Major Class [Axis] Minimum Minimum [Member] Members Equity Class B Units Members Equity Class B Units [Member] Members Equity Class B Units Less: Accumulated depreciation Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment Accounts, Notes, Loans and Financing Receivable [Line Items] Accounts, Notes, Loans and Financing Receivable [Line Items] Company Selected Measure Name Company Selected Measure Name Summary of Amortization of Intangible Assets Recorded in Consolidated Statements of Operations Finite-Lived Intangible Assets Amortization Expense [Table Text Block] Revolving Credit Facility Debt Disclosure [Text Block] Preferred stock, $0.001 par value Preferred Stock, Value, Issued Aggregate Available Trading Arrangement, Securities Aggregate Available Amount Accounts payable Accounts Payable, Current Cash paid for amounts included in operating lease liabilities Operating Lease, Payments Stock Appreciation Rights (SARs) Stock Appreciation Rights (SARs) [Member] All Executive Categories All Executive Categories [Member] Common stock Common Stock, Value, Issued Commitments and Contingencies Commitments and Contingencies Disclosure [Text Block] Title and Position [Axis] Title and Position [Axis] Diluted (shares) Weighted-average shares of Class A common stock outstanding—diluted (shares) Weighted Average Number of Shares Outstanding, Diluted Commitments and contingencies (Note 13) Commitments and Contingencies Exchange of Class B common stock for Class A common stock (shares) Stock Issued During Period, Shares, Conversion of Units Non-GAAP Measure Description Non-GAAP Measure Description [Text Block] Business Combination [Axis] Business Combination [Axis] Entity Small Business Entity Small Business Sales and marketing Selling and Marketing Expense [Member] Income Tax Disclosure [Abstract] Income Tax Disclosure [Abstract] 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. Noncontrolling Interests Noncontrolling Interest [Member] Preferred stock, shares outstanding (shares) Preferred Stock, Shares Outstanding Document Transition Report Document Transition Report Non-Marketable Equity Securities Equity Method Investments [Policy Text Block] Numerator Net Income (Loss) Available to Common Stockholders, Basic [Abstract] Minority Interest [Table] Noncontrolling Interest [Table] Underlying Securities Award Underlying Securities Amount Equity Component Equity Component [Domain] Document Period End Date Document Period End Date PEO Actually Paid Compensation Amount PEO Actually Paid Compensation Amount Income Taxes and Tax Receivable Agreement Income Tax Disclosure [Text Block] Class A Common Stock Common Class A [Member] Awards Close in Time to MNPI Disclosures, Table Awards Close in Time to MNPI Disclosures [Table Text Block] Revenue from Contract with Customer [Abstract] Revenue from Contract with Customer [Abstract] Loss before income taxes Income (Loss), Including Portion Attributable to Noncontrolling Interest, before Tax Short-term lease cost Short-Term Lease, Cost Operating lease liabilities Increase (Decrease) in Operating Lease Liability Total equity Beginning balance Ending balance Equity, Including Portion Attributable to Noncontrolling Interest Document Type Document Type Earnings (Loss) Per Share Earnings Per Share [Text Block] Name Outstanding Recovery, Individual Name Accrued member tax distributions Adjustments To Additional Paid In Capital Accrued Member Tax Distributions Adjustments to additional paid in capital, accrued member tax distributions. Additional paid-in capital Additional Paid in Capital Variable lease cost Variable Lease, Cost Revenue Revenue from Contract with Customer, Excluding Assessed Tax All Individuals All Individuals [Member] Purchases of property and equipment Payments to Acquire Property, Plant, and Equipment Point-in-time revenue Transferred at Point in Time [Member] Name Forgone Recovery, Individual Name Share-based compensation arrangement by share-based payment award, contractual term Share-Based Compensation Arrangement by Share-Based Payment Award, Expiration Period Total current assets Assets, Current Statistical Measurement Statistical Measurement [Axis] Year-over-Year Change in Fair Value of Equity Awards Granted in Prior Years That are Outstanding and Unvested Year-over-Year Change in Fair Value of Equity Awards Granted in Prior Years That are Outstanding and Unvested [Member] Authorized amount, stock repurchase program Share Repurchase Program, Authorized, Amount Facility fee for undrawn amounts Line of Credit Facility, Unused Capacity, Commitment Fee Percentage Aggregate Erroneous Compensation Amount Aggregate Erroneous Compensation Amount Repurchase of stock related to tax withholdings on vested equity awards Payment, Tax Withholding, Share-Based Payment Arrangement Peer Group Issuers, Footnote Peer Group Issuers, Footnote [Text Block] Net loss attributable to Viant Technology Inc. Net Income (Loss) Available to Common Stockholders, Basic Other platform operations Other Platform Operations [Member] Other Platform Operations Erroneous Compensation Analysis Erroneous Compensation Analysis [Text Block] Schedule Of Finite Lived Intangible Assets [Table] Intangible Asset, Finite-Lived [Table] Contract with Customer, Duration Contract with Customer, Duration [Domain] Current liabilities: Liabilities, Current [Abstract] Line Of Credit Facility [Line Items] Line of Credit Facility [Line Items] Lessee Lease Description [Line Items] Lessee, Lease, Description [Line Items] Rule 10b5-1 Arrangement Terminated Rule 10b5-1 Arrangement Terminated [Flag] Outstanding balance Long-Term Line of Credit Loss on disposal of assets Gain (Loss) on Disposition of Assets Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items] Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] Accrued liabilities Increase (Decrease) in Accrued Liabilities Schedule of Related Party Transactions, by Related Party [Table] Related Party Transaction [Table] Diluted (USD per share) Earnings Per Share, Diluted Erroneously Awarded Compensation Recovery Erroneously Awarded Compensation Recovery [Table] Accounts receivable, net of allowances Accounts Receivable, after Allowance for Credit Loss, Current Concentration Risk Benchmark Concentration Risk Benchmark [Domain] Title of 12(b) Security Title of 12(b) Security Aggregate Intrinsic Value, Vested and exercisable Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Vested and Expected to Vest, Exercisable, Aggregate Intrinsic Value Lessee Lease Description [Table] Lessee, Lease, Description [Table] Supplemental disclosure of non-cash investing and financing activities: Cash Flow, Noncash Investing and Financing Activities Disclosure [Abstract] Treasury stock, shares (shares) Beginning balance, treasury stock (shares) Ending balance, treasury stock (shares) Treasury Stock, Common, Shares Earnings (loss) per share of Class A common stock: Earnings Per Share [Abstract] Consolidation Items [Domain] Consolidation Items [Domain] Total other expense (income), net Nonoperating Income (Expense) Contractual obligation, to be paid 2024 Contractual Obligation, to be Paid, Year One Comprehensive Loss Comprehensive Income, Policy [Policy Text Block] Noncontrolling Interest [Abstract] Noncontrolling Interest [Abstract] Accrued Liabilities Accounts Payable and Accrued Liabilities Disclosure [Text Block] Traffic acquisition costs Traffic Acquisition [Member] Traffic Acquisition Anti-dilutive shares excluded from loss per share of Class A common stock—diluted: Antidilutive Securities Excluded From Earnings Loss Per Share [Abstract] Antidilutive securities excluded from earnings (loss) per share. Money market funds Money Market Funds, at Carrying Value Basis Of Presentation And Summary Of Significant Accounting Policies [Table] Basis Of Presentation And Summary Of Significant Accounting Policies [Table] Basis of presentation and summary of significant accounting policies. Tax receivable agreement, liability, current Tax Receivable Agreement, Liability, Current Tax Receivable Agreement, Liability, Current Cash paid for income taxes, net Income Taxes Paid, Net Repurchase of treasury shares in connection with the taxes paid related to net share settlement of equity awards (shares) Treasury Stock, Shares, Acquired Exercised (USD per share) Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price 2028 Finite-Lived Intangible Asset, Expected Amortization, Year Two Award Timing Disclosures [Line Items] Accrued liabilities Accrued Liabilities Cumulative days available for use (less than) Short-Term Lease, Cumulative Days Available For Use Short-Term Lease, Cumulative Days Available For Use Granted (USD per share) Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Grants in Period, Weighted Average Exercise Price Property, Equipment and Software, Net Property, Plant and Equipment Disclosure [Text Block] Total undiscounted future lease payments Lessee, Operating Lease, Liability, to be Paid Lessee operating lease renewal term Lessee, Operating Lease, Renewal Term Net loss attributable to Viant Technology, Inc.—diluted Net Income (Loss) Attributable to Parent, Diluted Net loss attributable to Viant Technology Inc. Net loss attributable to Viant Technology Inc. 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Accumulated deficit Retained Earnings (Accumulated Deficit) Class of Treasury Stock Class of Treasury Stock [Table Text Block] Supplier Concentration Risk Supplier Concentration Risk [Member] Furniture, fixtures and office equipment Furniture Fixtures And Office Equipment [Member] Furniture, fixtures and office equipment. Statement of Financial Position [Abstract] Statement of Financial Position [Abstract] Year-end Fair Value of Equity Awards Granted in Covered Year that are Outstanding and Unvested Year-end Fair Value of Equity Awards Granted in Covered Year that are Outstanding and Unvested [Member] Executive Category: Executive Category [Axis] Over-time revenue Transferred over Time [Member] Current Fiscal Year End Date Current Fiscal Year End Date Class of Stock Class of Stock [Axis] 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. Subsequent Event Type [Domain] Subsequent Event Type [Domain] Finite-Lived Intangible Assets, Major Class Name Finite-Lived Intangible Assets, Major Class Name [Domain] Aggregate Grant Date Fair Value of Equity Award Amounts Reported in Summary Compensation Table Aggregate Grant Date Fair Value of Equity Award Amounts Reported in Summary Compensation Table [Member] Payables and Accruals [Abstract] Payables and Accruals [Abstract] 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] Shares remained available for grant Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Available for Grant Statement [Table] Statement [Table] Deferred taxes Deferred Income Tax Expense (Benefit) Adjustments to reconcile net loss to net cash provided by (used in) operating activities: Adjustment to Reconcile Net Income to Cash Provided by (Used in) Operating Activity [Abstract] Cash flows from financing activities: Cash Provided by (Used in) Financing Activity, Including Discontinued Operation [Abstract] Equity Awards Adjustments, Excluding Value Reported in Compensation Table Equity Awards Adjustments, Excluding Value Reported in the Compensation Table [Member] Noncontrolling Interests Noncontrolling Interest Disclosure [Text Block] Beginning balance (shares) Ending balance (shares) Shares, Issued Variable Rate Variable Rate [Domain] Timing of Transfer of Good or Service Timing of Transfer of Good or Service [Domain] Total shares excluded from loss per share of Class A common stock—diluted (shares) Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount Undrawn availability percentage Line Of Credit Facility, Undrawn Availability Percentage Line Of Credit Facility, Undrawn Availability Percentage Weighted-average shares of Class A common stock outstanding: Weighted Average Number of Shares Outstanding, Diluted [Abstract] All Adjustments to Compensation All Adjustments to Compensation [Member] Retirement of treasury stock (in shares) Treasury Stock, Shares, Retired Amendment Flag Amendment Flag Leases Lessee, Operating Leases [Text Block] Termination Date Trading Arrangement Termination Date Net cash used in financing activities Cash Provided by (Used in) Financing Activity, Including Discontinued Operation Insider Trading Policies and Procedures Adopted Insider Trading Policies and Procedures Adopted [Flag] Measure: Measure [Axis] Ownership percentage by non-controlling interests Economic Interests Ownership Percentage Economic interests ownership percentage. Platform operations Platform Operations [Member] Platform operations. Summary of Nonqualified Stock Option Activity Share-Based Payment Arrangement, Option, Activity [Table Text Block] Basis of Presentation and Summary of Significant Accounting Policies Basis of Presentation and Significant Accounting Policies [Text Block] Long-Lived Tangible Asset Long-Lived Tangible Asset [Domain] Basic (shares) Weighted-average shares of Class A common stock outstanding—basic (shares) Weighted Average Number of Shares Outstanding, Basic Schedule Of Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Table] Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Table] Share repurchase program, remaining authorized, amount Share Repurchase Program, Remaining Authorized, Amount Platform operations Cost of Product and Service Sold Calculation of Basic and Diluted Net Loss Per Share Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] Director Director [Member] PNC Bank P N C Bank [Member] PNC Bank. Subsequent Events [Abstract] Pay vs Performance Disclosure, Table Pay vs Performance [Table Text Block] Supplier Supplier [Domain] Debt Disclosure [Abstract] Debt Disclosure [Abstract] Forgone Recovery due to Violation of Home Country Law, Amount Forgone Recovery due to Violation of Home Country Law, Amount Entity Tax Identification Number Entity Tax Identification Number Operating expenses: Costs and Expenses [Abstract] Provision for doubtful accounts Accounts Receivable, Allowance for Credit Loss, Period Increase (Decrease) Write-offs, net of recoveries Accounts Receivable, Allowance for Credit Loss, Writeoff Add back: Reallocation of net loss attributable to noncontrolling interest from the assumed exchange of RSUs and NQSOs for Class A common stock Dilutive Securities, Effect on Basic Earnings Per Share, ESOP Convertible Preferred Stock, Net Dilutive Securities, Effect on Basic Earnings Per Share, ESOP Convertible Preferred Stock, Net Weighted-Average Exercise Price of outstanding, beginning balance (USD per share) Weighted-Average Exercise Price of outstanding, ending balance (USD per share) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Weighted Average Exercise Price Forgone Recovery due to Expense of Enforcement, Amount Forgone Recovery due to Expense of Enforcement, Amount Share Based Compensation Arrangement By Share Based Payment Award [Line Items] Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] Accrued traffic acquisition costs Accrued Traffic Acquisition Costs Accrued traffic acquisition costs. 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Granted (shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross Income tax benefit (expense) from the assumed exchange of dilutive securities for Class A common stock Dilutive Securities, Effect on Basic Earnings Per Share, ESOP Convertible Preferred Stock, Income Tax Effect Dilutive Securities, Effect on Basic Earnings Per Share, ESOP Convertible Preferred Stock, Income Tax Effect Use of Estimates Use of Estimates, Policy [Policy Text Block] Trading Arrangement: Trading Arrangement [Axis] Total Shareholder Return Amount Total Shareholder Return Amount Subsequent Events Subsequent Events [Text Block] Insider Trading Arrangements [Line Items] Name of each exchange on which registered Security Exchange Name Canceled (USD per share) Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Forfeitures in Period, Weighted Average Exercise Price 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] Contractual obligation, to be paid 2025 Contractual Obligation, to be Paid, Year Two Total liabilities Liabilities Antidilutive Securities, Name Antidilutive Securities, Name [Domain] Capitalized assets financed by accounts payable and accrued liabilities Capital Expenditures Incurred but Not yet Paid Senior secured revolving credit facility, maximum borrowing capacity Line of Credit Facility, Maximum Borrowing Capacity Pension Adjustments Prior Service Cost Pension Adjustments Prior Service Cost [Member] JOBS Act Election as an Emerging Growth Company J O B S Act Election As Emerging Growth Company Policy Policy [Policy Text Block] JOBS Act Election as an Emerging Growth Company Policy. Repurchase of stock related to the stock repurchase program (shares) Stock Repurchased During Period, Shares Material Terms of Trading Arrangement Material Terms of Trading Arrangement [Text Block] Other current liabilities Other Liabilities, Current Trademarks/tradenames Trademarks and Trade Names [Member] Units Owned, Noncontrolling Interest (shares) Number Of Units Owned, Noncontrolling Interest Number of units owned. Statement [Line Items] Statement [Line Items] Variable Rate Variable Rate [Axis] Consolidation Items [Axis] Consolidation Items [Axis] Rule 10b5-1 Arrangement Adopted Rule 10b5-1 Arrangement Adopted [Flag] Cash and cash equivalents Cash and Cash Equivalent Summary of RSU Activity Share-Based Payment Arrangement, Restricted Stock Unit, Activity [Table Text Block] Subsequent Event [Line Items] Subsequent Event [Line Items] Common Stock Common Stock [Member] Vested (shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period Entity Incorporation, State or Country Code Entity Incorporation, State or Country Code Non-NEOs Non-NEOs [Member] Net decrease in cash and cash equivalents Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Period Increase (Decrease), Including Exchange Rate Effect and Discontinued Operation Long-term portion of TRA liability Tax Receivable Agreement, Liability, Non-Current Tax Receivable Agreement, Liability, Non-Current