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Significant Accounting Policies - Schedule of Capitalized Costs in the Consolidated Balance Sheets (Details) - USD ($) $ in Thousands	Dec. 31, 2025	Dec. 31, 2024
Accounting Policies [Abstract]
Prepaid expenses	$ 2,478	$ 2,327
Investments and other assets, net	$ 4,731	$ 6,178

X

- Definition

Capitalized costs in investments and other assets.

+ References

No definition available.

+ Details

Name:	cars_CapitalizedCostsInInvestmentsAndOtherAssets
Namespace Prefix:	cars_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Capitalized costs in prepaid expenses.

+ References

No definition available.

+ Details

Name:	cars_CapitalizedCostsInPrepaidExpenses
Namespace Prefix:	cars_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- References

No definition available.

+ Details

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