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Deferred Costs (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2026 | Jun. 30, 2025 | Jun. 30, 2026 | Jun. 30, 2025
Deferred Costs [Roll Forward] |  |  |  |
Balance, beginning of period | $ 86,200 | $ 88,523 | $ 87,412 | $ 85,914
Incurred deferred costs | 21,365 | 24,112 | 42,875 | 52,730
Amortized deferred costs | (23,268) | (24,731) | (45,990) | (50,740)
Balance, end of period | $ 84,297 | $ 87,904 | $ 84,297 | $ 87,904

X
- 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

X
- 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

X
- 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