Leases - Narrative (Details) $ in Thousands	Jun. 30, 2024 USD ($)
Leases [Abstract]
Operating lease, lease liability, decrease from lease term reassessment	$ 2,304
Operating lease, right of use asset, decrease from lease term reassessment	$ 2,102

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

No definition available.

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