COMMITMENTS AND CONTINGENCIES (Details) - USD ($)	Dec. 31, 2020	Sep. 09, 2020
COMMITMENTS AND CONTINGENCIES
Deferred fee per unit	$ 0.35
Deferred underwriting fee payable	$ 4,025,000	$ 4,025,000

The carrying value as of balance sheet date of underwriting compensation deferred, classified as noncurrent.

No definition available.

Name:	capau_DeferredUnderwritingCompensationNoncurrent
Namespace Prefix:	capau_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant