Permanent Equity - Warrants (Details)	Mar. 31, 2024 shares
Additional disclosures
Class of warrant or right, maximum number of securities called by warrants or rights, cancelled	3,763,860

Class of warrant or right, maximum number of securities called by warrants or rights, cancelled.

No definition available.

Name:	cgrn_ClassOfWarrantOrRightMaximumNumberOfSecuritiesCalledByWarrantsOrRightsCancelled
Namespace Prefix:	cgrn_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant