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Commitments and Contingencies - Narrative (Details) ft² in Thousands	Dec. 31, 2023 ft² option
Commitments and Contingencies Disclosure [Abstract]
Current leased space | ft²	198
Number of extension options | option	2
Lease extension period	5 years

X

- Definition

Area of leased space.

+ References

No definition available.

+ Details

Name:	spsc_LesseeOperatingLeaseAreaOfLeasedSpace
Namespace Prefix:	spsc_
Data Type:	dtr-types1:areaItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Lessee, Operating Lease, Number Of Extension Options

+ References

No definition available.

+ Details

Name:	spsc_LesseeOperatingLeaseNumberOfExtensionOptions
Namespace Prefix:	spsc_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

X

- References

No definition available.

+ Details

Name:	us-gaap_CommitmentsAndContingenciesDisclosureAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Term of lessee's operating lease renewal, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 842
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Subparagraph (a)(3)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147478964/842-20-50-3

+ Details

Name:	us-gaap_LesseeOperatingLeaseRenewalTerm
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	instant