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Deferred Costs - Additional Information (Detail) | 12 Months Ended
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Dec. 31, 2018
Deferred Costs [Abstract] |
Deferred commission expected amortization period | 2 years

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- Definition Deferred commission expected amortization period. + References No definition available. + Details
Name: | spsc_DeferredCommissionExpectedAmortizationPeriod
Namespace Prefix: | spsc_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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