Chapter 11 Proceedings - DIP Note Purchase Agreement (Details)

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Chapter 11 Proceedings - DIP Note Purchase Agreement (Details) - Subsequent Event [Member] - USD ($) $ in Millions	Dec. 07, 2023	Oct. 24, 2023	Oct. 03, 2023	Oct. 02, 2023
Short-Term Debt [Line Items]
Percentage of common equity received by pre-petition holders	100.00%
Percentage of common equity interest received by existing shareholders subject to dilution	100.00%
Percentage of pro rata share received by shareholders subject to dilution			100.00%
DIP Note Purchase Agreement [Member]
Short-Term Debt [Line Items]
Debtor-in-Possession Financing, Letters of Credit Outstanding			$ 30.0
Debtor-in-Possession Financing, Amount Arranged			12.0
Debtor-in-Possession Financing, Borrowings Outstanding			$ 18.0
Debtor-in-Possession Financing, Amount Drawn		$ 3.0		$ 9.0

- Definition

Represents the amount of debtor-in-possession financing drawn.

+ References

No definition available.

+ Details

Name:	cgrn_DebtorInPossessionFinancingAmountDrawn
Namespace Prefix:	cgrn_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Represents the percentage of common equity interest received by existing shareholders subject to dilution.

+ References

No definition available.

+ Details

Name:	cgrn_PercentageOfCommonEquityInterestReceivedByExistingShareholdersSubjectToDilution
Namespace Prefix:	cgrn_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Represents the percentage of common equity interest received by pre-petition holders.

+ References

No definition available.

+ Details

Name:	cgrn_PercentageOfCommonEquityInterestReceivedByPrePetitionHolders
Namespace Prefix:	cgrn_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Represents the percentage of pro rata share received by shareholders subject to dilution.

+ References

No definition available.

+ Details

Name:	cgrn_PercentageOfProRataShareReceivedByShareholdersSubjectToDilution
Namespace Prefix:	cgrn_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount debtor-in-possession financing arranged (but not necessarily all borrowed).

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 852
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 18
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481435/852-10-45-18

+ Details

Name:	us-gaap_DebtorInPossessionFinancingAmountArranged
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount of debtor-in-possession borrowings outstanding.

+ References

+ Details

Name:	us-gaap_DebtorInPossessionFinancingBorrowingsOutstanding
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount of letters of credit outstanding under debtor-in-possession financing arrangement.

+ References

+ Details

Name:	us-gaap_DebtorInPossessionFinancingLettersOfCreditOutstanding
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
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

No definition available.

+ Details

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

- Details

Name:	us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=cgrn_DipNotePurchaseAgreementMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Quarterly report pursuant to Section 13 or 15(d)

Chapter 11 Proceedings - DIP Note Purchase Agreement (Details)