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Unaudited Condensed Consolidated Income Statements (Parenthetical) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025
Income Statement [Abstract]
Depreciation and amortization expense	$ 4,200,000	$ 2,100,000	$ 7,700,000	$ 4,000,000
Impairment of other assets	$ 0	$ 0	$ 500,000	$ 0

X

- Definition

Cost of goods and services sold depreciation amortization expense.

+ References

No definition available.

+ Details

Name:	carg_CostOfGoodsAndServicesSoldDepreciationAmortizationExpense
Namespace Prefix:	carg_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Impairment in cost of revenue.

+ References

No definition available.

+ Details

Name:	carg_ImpairmentInCostOfRevenue
Namespace Prefix:	carg_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- References

No definition available.

+ Details

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