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Summary of Business and Significant Accounting Policies - Summary of Deferred Commissions (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021
Accounting Policies [Abstract] |  |
Beginning balance | $ 28,685 | $ 19,440
Additions to deferred commissions | 17,740 | 16,077
Amortization of deferred commissions | (9,708) | (6,832)
Ending balance | 36,717 | 28,685
Deferred commissions, current portion | 10,918 | 8,112
Deferred commissions, net of current portion | 25,799 | 20,573
Deferred Commission, Total | $ 36,717 | $ 28,685

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- Definition Additions to deferred commissions. + References No definition available. + Details
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Namespace Prefix: | ampl_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Amortization of deferred commissions. + References No definition available. + Details
Name: | ampl_AmortizationOfDeferredCommissions
Namespace Prefix: | ampl_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Deferred commission. + References No definition available. + Details
Name: | ampl_DeferredCommission
Namespace Prefix: | ampl_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Deferred commission current. + References No definition available. + Details
Name: | ampl_DeferredCommissionCurrent
Namespace Prefix: | ampl_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Deferred commission current and noncurrent. + References No definition available. + Details
Name: | ampl_DeferredCommissionCurrentAndNoncurrent
Namespace Prefix: | ampl_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Deferred commission noncurrent. + References No definition available. + Details
Name: | ampl_DeferredCommissionNoncurrent
Namespace Prefix: | ampl_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- References No definition available. + Details
Name: | us-gaap_AccountingPoliciesAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration