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Deferred Costs - Summary of Deferred Costs Activity (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022
Deferred Costs [Roll Forward] |  |
Balance, beginning of year | $ 70,179 | $ 59,720
Incurred deferred costs | 89,012 | 72,509
Amortized deferred costs | (76,441) | (62,050)
Balance, end of year | $ 82,750 | $ 70,179

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- Definition Deferred costs amortized. + References No definition available. + Details
Name: | spsc_DeferredCostsAmortized
Namespace Prefix: | spsc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Deferred costs incurred. + References No definition available. + Details
Name: | spsc_DeferredCostsIncurred
Namespace Prefix: | spsc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Deferred Costs + References No definition available. + Details
Name: | spsc_DeferredCostsRollForward
Namespace Prefix: | spsc_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition The carrying amount of deferred costs. + References No definition available. + Details
Name: | us-gaap_DeferredCostsCurrentAndNoncurrent
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant