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Revenue from Contracts with Customers - Summary of Deferred Commissions (Details) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2025 | Mar. 31, 2024
Revenue from Contract with Customer [Abstract] |  |
Beginning balance | $ 42,651 | $ 38,386
Additions to deferred commissions | 4,612 | 3,227
Amortization of deferred commissions | (3,906) | (3,352)
Ending balance | 43,357 | 38,261
Deferred commissions, current portion | 15,412 | 13,190
Deferred commissions, net of current portion | 27,945 | 25,071
Total deferred commission | $ 43,357 | $ 38,261

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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
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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
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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
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
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