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Revenue and Deferred Revenue - Narrative (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2021
Revenue from Contract with Customer [Abstract]
Revenue recognized related to performance obligations satisfied or partially satisfied in prior periods	$ 0.1	$ 0.8

X

- Definition

Revenue, Performance Obligation, Satisfied Or Partially Satisfied In Prior Periods, Amount

+ References

No definition available.

+ Details

Name:	crct_RevenuePerformanceObligationSatisfiedOrPartiallySatisfiedInPriorPeriodsAmount
Namespace Prefix:	crct_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- References

No definition available.

+ Details

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