Number of Properties Subleased

No definition available.

Name:	sqsp_NumberOfPropertiesSubleased
Namespace Prefix:	sqsp_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

- Definition

Operating Lease, Additional Expense

+ References

No definition available.

+ Details

Name:	sqsp_OperatingLeaseAdditionalExpense
Namespace Prefix:	sqsp_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Operating Lease, Lease Liability, Decrease From Lease Term Reassessment

+ References

No definition available.

+ Details

Name:	sqsp_OperatingLeaseLeaseLiabilityDecreaseFromLeaseTermReassessment
Namespace Prefix:	sqsp_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Operating Lease, Right of Use Asset, Decrease From Lease Term Reassessment

+ References

No definition available.

+ Details

Name:	sqsp_OperatingLeaseRightOfUseAssetDecreaseFromLeaseTermReassessment
Namespace Prefix:	sqsp_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 842
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147478964/842-20-50-3

+ Details

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

- Definition

Amount of loss from impairment of right-of-use asset from operating lease.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 842
-SubTopic 20
-Name Accounting Standards Codification
-Section 25
-Paragraph 6
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479365/842-20-25-6

+ Details

Name:	us-gaap_OperatingLeaseImpairmentLoss
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Amount of sublease income excluding finance and operating lease expense.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 842
-SubTopic 20
-Name Accounting Standards Codification
-Section 55
-Paragraph 53
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479589/842-20-55-53

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 842
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 4
-Subparagraph (e)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147478964/842-20-50-4

+ Details

Name:	us-gaap_SubleaseIncome
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Details

Name:	srt_StatementGeographicalAxis=stpr_IL
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_StatementGeographicalAxis=stpr_CA
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Leases - Narrative (Details) $ in Thousands	3 Months Ended		9 Months Ended
Leases - Narrative (Details) $ in Thousands	Sep. 30, 2023 USD ($)	Sep. 30, 2022 USD ($)	Sep. 30, 2023 USD ($)	Sep. 30, 2022 USD ($)	Mar. 10, 2022 sublease
Lessee, Lease, Description [Line Items]
Number of properties subleased \| sublease					1
Sublease income	$ 67	$ 161	$ 378	$ 471
Operating lease, lease liability, decrease from lease term reassessment		3,213		3,213
Operating lease, right of use asset, decrease from lease term reassessment		3,213		3,213
Operating lease, impairment loss		1,694		1,694
Illinois
Lessee, Lease, Description [Line Items]
Sublease income		$ 75	$ 152	200
California
Lessee, Lease, Description [Line Items]
Additional operating lease expense recorded				$ 258