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No Customer No Customer [Member] Financial Instrument [Axis] Current assets: Assets, Current [Abstract] Comprehensive loss Other Comprehensive Income (Loss), Tax Comprehensive loss Equity Plan Stock Options Early Exercised Equity Plan Stock Options Early Exercised [Member] Equity Plan Stock Options Early Exercised [Member] Amortization of intangible assets Amortization of Intangible Assets Amortization of Intangible Assets, Total Class B Common Stock Common Class B [Member] Non-recurring Fair Value, Nonrecurring [Member] Deferred commission amortization period. 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Sales and Marketing [Member] Selling and Marketing Expense [Member] Entity Address, Address Line Two Entity Address, Address Line Two Fair Value Disclosures [Text Block] Fair Value Measurements UNITED STATES United States Schedule of Accrued Expenses Schedule of Accrued Liabilities [Table Text Block] Noncash Investing and Financing Items [Abstract] Non-cash investing and financing activities: Plan Name Plan Name [Domain] Weighted-average remaining vesting period Net Amount at Risk by Product and Guarantee, Weighted Average Period Remaining Cost of revenue Cost of Product and Service Sold Cost of Goods and Services Sold, Total Restricted Stock, Shares Issued Net of Shares for Tax Withholdings Tax withholding on net share settlement of restricted stock units, shares Cancelled/forfeited Share Based Compensation Arrangement By Share Based Payment Award Options Forfeited In Period Total Intrinsic Value Share Based Compensation Arrangement By Share Based Payment Award Options Forfeited In Period Total Intrinsic Value. Kraftful Acquisition [Member] Kraftful Acquisition [Member] Kraftful Acquisition Atkins v. Amplitude, Inc. [Member] Atkins v. Amplitude, Inc. [Member] Atkins v. Amplitude, Inc. 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Supplemental Cash Flow Information Table Text Block Summary of Supplemental Cash Flow Information Accrued sales tax Accrued Sales Tax Current Accrued sales tax current. Employee stock purchase plan withholding. Employee Stock Purchase Plan Withholding 2021 Employee Stock Purchase Plan withholding Summary of Stock Option Activity Share-Based Payment Arrangement, Option, Activity [Table Text Block] Cash paid for acquisitions, net of cash acquired Payments to Acquire Businesses, Net of Cash Acquired Payments to Acquire Businesses, Net of Cash Acquired, Total Net of cash acquired Stockholders' Equity and Equity Incentive Plans Equity [Text Block] Net Loss Per Share Earnings Per Share [Text Block] Schedule of RSU Activity Share-Based Payment Arrangement, Restricted Stock Unit, Activity [Table Text Block] Net loss attributable to Class A and Class B common stockholders Net loss Grant date fair value Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Intrinsic Value Balances as of December 31, 2023 Balance as of September 30, 2024 Operating Lease, Cost Operating lease cost Expected dividend yield Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Expected Dividend Rate Cash received for tax withholding obligations on equity award settlements Proceeds from (Payment for) Other Financing Activity Intangible assets, net Intangible Assets, Net (Excluding Goodwill) Intangible Assets, Net (Excluding Goodwill), Total Net Carrying Amount Operating Lease, Payments Cash paid for operating lease liabilities Operating lease liabilities ASSETS Assets [Abstract] Risk-free interest rate Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Risk Free Interest Rate Prepaid expenses and other current assets Increase (Decrease) in Prepaid Expense and Other Assets Increase (Decrease) in Prepaid Expense and Other Assets, Total Document Fiscal Year Focus Document Fiscal Year Focus Deferred commissions, current portion Deferred Commission Current Deferred commission current. Concentration Risk Benchmark Concentration Risk Benchmark [Domain] Cash Provided by (Used in) Investing Activity, Including Discontinued Operation [Abstract] Cash flows provided by (used in) investing activities: Retirement Benefits [Abstract] Accounts payable Accounts Payable, Current Accounts Payable, Current, Total Two Thousands Twenty One Incentive Award Plan [Member] Two Thousands Twenty One Incentive Award Plan [Member] 2021 Incentive Award Plan Fair value shares vested Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Vested in Period, Fair Value Restricted stock shares issued under employee retention Restricted Stock Shares Issued Under Employee Retention Restricted stock shares issued under employee retention. Research and Development [Member] Research and Development Expense [Member] total right-of-use total right-of-use Other Operating Segment [Member] All Other Segments [Member] Other noncurrent assets Increase (Decrease) in Other Noncurrent Assets Additions to deferred commissions Additions To Deferred Commissions Additions to deferred commissions. Finite-Lived Intangible Asset, Expected Amortization, Year One 2026 Fair Value Measurement Fair Value Measurement, Policy [Policy Text Block] Proceeds from the exercise of stock options Proceeds from Stock Options Exercised Fair Value Disclosures [Abstract] Commitments and Contingencies Disclosure [Abstract] Lessee, Operating Lease, Liability, to be Paid, Year One 2026 Operating Leases, Rent Expense, Total Operating Leases, Rent Expense Rent Expense Fair value of assets acquired Fair Value of Assets Acquired Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount Unrecognized share-based compensation expense Estimated Fair Value Assets, Fair Value Disclosure, Total Assets, Fair Value Disclosure Concentration Risk, Percentage Concentration Risk, Percentage Net cash provided by (used in) investing activities Cash Provided by (Used in) Investing Activity, Including Discontinued Operation Title of 12(b) Security Title of 12(b) Security Cancelled/forfeited Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Forfeitures in Period, Weighted Average Exercise Price Cancelled/forfeited Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value Debt Securities, Available-for-Sale, Amortized Cost, Maturity, Allocated and Single Maturity Date, after Year One Through Five Due in one to two years Due in greater than one year Money Market Funds [Member] Money market funds Income Taxes Income Tax Disclosure [Text Block] Accrued hosting Accrued Hosting Accrued Hosting 2014 Stock Option Plan Two Thousand Fourteen Stock Option Plan [Member] Two thousand fourteen stock option plan. Capitalization of internal-use software costs Payments for Software Payments for Software, Total Weighted Average Number of Shares Issued, Basic Weighted-average shares used in computing net loss per share attributable to Class A and Class B common stockholders, basic Lessee, Operating Lease, Liability, to be Paid, Remainder of Fiscal Year Remainder of 2025 Document Information [Table] Document Information [Table] Other Liabilities, Noncurrent, Total Other Liabilities, Noncurrent Noncurrent liabilities 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] Schedule of Estimated Useful Lives of Property and Equipment Property, Plant and Equipment [Table Text Block] Liquidation Date, Expected to Complete Ending date Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Weighted Average Exercise Price Balances as of December 31, 2023 Balance as of September 30, 2024 Income Tax Disclosure [Abstract] Amount of lessee's undiscounted obligation for lease payment for operating lease due after third fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach). Lessee, Operating Lease, Liability, to be Paid, after Year Three 2029 and thereafter Additional Paid-in Capital Additional Paid-in Capital [Member] Share Based Compensation Arrangement by Share Based Payment Award Options Issued Grant Date Fair Value Share Based Compensation Arrangement by Share Based Payment Award Options Issued Grant Date Fair Value Issuance of shares to employees, grant date fair value Measurement Frequency [Domain] Income Statement Location Statement of Income Location, Balance [Axis] Trading Symbol Trading Symbol Debt Securities, Available-for-Sale, Amortized Cost, Maturity, Allocated and Single Maturity Date, Year One Due in one year or less Subsequent Event Type [Axis] Schedule of Intangible Assets, Net Schedule of Finite-Lived Intangible Assets [Table Text Block] Employee-related Liabilities, Current Employee-related Liabilities, Current, Total Accrued payroll and employee related taxes Cash Provided by (Used in) Financing Activity, Including Discontinued Operation [Abstract] Cash flows provided by (used in) financing activities: Expected term (years) Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Expected Term Entity Ex Transition Period Schedule Of Impaired Financing Receivable [Table] Schedule of Impaired Financing Receivable [Table] Total undiscounted operating lease payments Lessee, Operating Lease, Liability, to be Paid Lessee, Operating Lease, Liability, Undiscounted Excess Amount Less: imputed interest Undiscounted Lease Commitment New Lease Fair Value Measurement Inputs and Valuation Techniques [Line Items] Stock-based compensation capitalized as internal-use software costs Capitalization of internal-use software costs Capitalization of internal-use software costs Selling and Marketing Expense, Total Selling and Marketing Expense Sales and marketing Equity Components Equity Components [Axis] Compensation expense Deferred Compensation Arrangement with Individual, Allocated Share-Based Compensation Expense Equity Component Equity Component [Domain] Derecognized deferred rent Derecognized deferred rent Goodwill of assets Goodwill, Transfers Business Acquisition Business Combination [Axis] Issuance of common stock under employee share purchase plan, Shares Stock Issued During Period, Shares, Employee Stock Purchase Plans Customer Customer [Axis] Two executives. Two Executives Two Executives [Member] Depreciation and amortization Depreciation, Depletion and Amortization, Nonproduction Depreciation, Depletion and Amortization, Nonproduction, Total Common Stock, Voting Rights Common Stock, Voting Rights Maximum [Member] Maximum Statistical Measurement [Axis] Exercised Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price Accumulated Amortization Finite-Lived Intangible Assets, Accumulated Amortization Accumulated Amortization Common Stock, Value, Issued Common Stock, Value, Issued, Total Common Stock, Value, Issued, Beginning Balance Common Stock, Value, Issued, Ending Balance Common Stock Value Impairment of Long-Lived Assets Impairment or Disposal of Long-Lived Assets, Policy [Policy Text Block] Developed Technology Developed Technology [Member] Developed Technology Member. Plaintiff's Amended Complaint Filing Deadline date Plaintiff's Amended Complaint Filing Deadline date Plaintiff's Amended Complaint Filing Deadline date Amortization of deferred commissions Amortization Of Deferred Commissions Amortization of deferred commissions. Schedule of Expected Future Amortization Expense Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block] Deferred Revenue Deferred Revenue Policy [Text Block] Deferred Revenue. Shah v. Amplitude, Inc. [Member] Shah v. Amplitude, Inc. [Member] Shah v. Amplitude, Inc. [Member] Expected volatility Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Expected Volatility Rate Preferred Stock, Shares Authorized Preferred Stock, Shares Authorized Granted Share Based Compensation Arrangement By Share Based Payment Award Options Granted In Period Total Intrinsic Value Share Based Compensation Arrangement By Share Based Payment Award Options Granted In Period Total Intrinsic Value. Finite-Lived Intangible Assets by Major Class Finite-Lived Intangible Assets by Major Class [Axis] Payment, Tax Withholding, Share-Based Payment Arrangement Cash paid for tax withholding obligations on equity award settlements Concentration of risk and significant customers. Concentration of Risk and Significant Customers Concentration Of Risk And Significant Customers Policy [Text Block] Revenue from Contract with Customer [Text Block] Revenue from Contracts with Customers Schedule Of Business Acquisitions By Acquisition [Table] Business Combination [Table] Entity Registrant Name Entity Registrant Name Debt Debt Disclosure [Text Block] Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax Gross Unrealized Losses Gross Unrealized Losses Revenue Customer Concentration Risk [Member] Finite-Lived Intangible Asset, Expected Amortization, Year Two 2027 Other Nonoperating Income (Expense) Other Nonoperating Income (Expense), Total Other income (expense), net Additional paid-in capital Additional Paid in Capital Additional Paid in Capital, Total Additional Paid in Capital, Beginning Balance Additional Paid in Capital, Ending Balance Subsequent Events [Abstract] Redeemable Convertible Preferred Stock [Abstract] Redeemable convertible preferred stock. Finite-Lived Intangible Asset, Expected Amortization, Year Three 2028 Income Tax Expense (Benefit) Income Tax Expense (Benefit), Total Provision for income taxes Provision for income taxes Measurement Frequency [Axis] Stock Repurchased During Period, Value Stock Repurchased During Period Value Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding Deferred revenue Deferred Revenue, Revenue Recognized Accumulated Other Comprehensive Income (Loss), Net of Tax, Total Accumulated Other Comprehensive Income (Loss), Net of Tax Other comprehensive loss, net Accumulated other comprehensive income Consolidation Items [Axis] Payments for Restructuring Payments Payments Purchase of property and equipment Payments to Acquire Property, Plant, and Equipment Payments to Acquire Property, Plant, and Equipment, Total Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period Granted Total assets Assets Income Statement [Abstract] Weighted average remaining contractual life (years), Exercisable Share-Based Payment Arrangement, Option, Exercise Price Range, Exercisable, Weighted Average Remaining Contractual Term Share-Based Compensation Share-Based Payment Arrangement [Policy Text Block] Vested Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period Vested Earnings Per Share, Diluted, Total Earnings Per Share, Diluted Net loss per share attributable to Class A and Class B common stockholders, diluted Total deferred commissions Deferred Commission Deferred commission. Total deferred commission Schedule of Segment Reporting Information, by Segment [Table Text Block] Schedule Of Segment Reporting Information By Segment Operating Segments [Member] Operating Segments [Member] Title of Individual Title and Position [Domain] City Area Code City Area Code Other comprehensive income (loss), net Other Comprehensive Income (Loss), Net of Tax, Total Other Comprehensive Income (Loss), Net of Tax Business Acquisition [Line Items] Business Combination [Line Items] Intrinsic value Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Aggregate Intrinsic Value, Vested Issuance of common stock under employee share purchase plan Stock Issued During Period, Value, Employee Stock Purchase Plan Litigation Case [Axis] Operating Lease, Weighted Average Remaining Lease Term Weighted average remaining term (years) Segment Reporting Information [Line Items] Lease, Cost Total lease cost Stock vesting period Stock Vesting Period Stock vesting period. Property and equipment, net Property and equipment, net Property, Plant and Equipment, Net Property, Plant and Equipment, Net, Beginning Balance Property, Plant and Equipment, Net, Ending Balance Fair value of business consideration Fair Value Of Business Consideration Fair value of business consideration. Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Vested and Expected to Vest, Exercisable, Number Balance as of September 30, 2024 Net unrealized gains (losses) on marketable securities Net unrealized gains (losses) on marketable securities Net unrealized gains on marketable securities Hawkins vs Spenser Skates [Member] Hawkins vs Spenser Skates [Member] Hawkins vs Spenser Skates [Member] Accumulated Deficit Retained Earnings [Member] Cash and Cash Equivalents [Axis] Employee Benefits and Share-Based Compensation Stock-based compensation expense and related employer payroll taxes Stock-based compensation expense Share-Based Payment Arrangement, Noncash Expense Share-based Payment Arrangement, Noncash Expense, Total Share Repurchase Program, Authorized, Number of Shares shares repurchased under the Repurchase Program Less than or equal to 12 months Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months Operating Lease, Weighted Average Discount Rate, Percent Weighted average discount rate Operating Lease, Liability, Noncurrent Operating lease liabilities, noncurrent Fair Value, Inputs, Level 1 [Member] Fair Value Level 1 Class Of Stock [Line Items] Class of Stock [Line Items] Net cash provided by (used in) financing activities Cash Provided by (Used in) Financing Activity, Including Discontinued Operation Lease, Cost [Table Text Block] Summary of Components of Lease Cost Equity Plan Stock Options Outstanding Equity Plan Stock Options Outstanding [Member] Equity Plan Stock Options Outstanding [Member] Customer-Related Intangible Assets Customer-Related Intangible Assets [Member] Schedule of Prepaid Expenses and Other Current Assets Schedule of Other Current Assets [Table Text Block] Restructuring and Other Related Charges [Member] Restructuring Charges [Member] Vesting of early exercised stock options Adjustments To Additional Paid In Capital Vesting Of Early Exercised Stock Options Adjustments to additional paid in capital, vesting of early exercised stock options. US Government Corporations and Agencies Securities [Member] U.S. governmental securities Schedule of Ant-dilutive Securities Excluded from Calculation of Diluted Net Loss Per Share Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block] Entity Interactive Data Current Entity Interactive Data Current Prepaid hosting Prepaid Hosting Current Prepaid hosting current. Income Statement Location Statement of Income Location, Balance [Domain] Cash flows from operating activities: Cash Provided by (Used in) Operating Activity, Including Discontinued Operation [Abstract] Cumulative Effect, Period of Adoption, Adjusted Balance [Member] Cumulative Effect of Topic 842 [Member] Business acquisition, equity issued Business Combination, Consideration Transferred, Equity Interest, Share Issued, Number of Shares Common shares issued for business acquisition Cash and cash equivalents Cash Equivalents, at Carrying Value Cash Equivalents, at Carrying Value, Total Cumulative Effect, Period of Adoption [Domain] Option Indexed to Issuer's Equity, Type Option Indexed to Issuer's Equity, Type [Domain] Entity Tax Identification Number Entity Tax Identification Number Fair value of common stock Share Price Accrued Sales Commission, Current Accrued commission and bonus Local Phone Number Local Phone Number Short-Term Lease, Cost Short-term lease cost Restructuring Costs, Total Restructuring Costs Restructuring costs Accounting Policies [Abstract] Thomas Hansen [Member] Thomas Hansen [Member] Thomas Hansen [Member] Cash Received From Maturities Cash Received From Maturities Cash received from maturities of marketable securities Revenue Revenue from Contract with Customer, Excluding Assessed Tax Revenue from Contract with Customer, Excluding Assessed Tax, Total Total revenue Class of Stock Class of Stock [Domain] Schedule of Reserved Shares of Common Stock Schedule Of Reserved Shares Of Common Stock Table [Text Block] Tabular disclosure of Schedule of reserved shares of common stock. Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition Unrecognized share-based compensation expense recognition period (term) Compensation expense recognition period Schedule Of Stock By Class [Table] Stock, Class of Stock [Table] Entity Emerging Growth Company Entity Emerging Growth Company