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Subsequent Event - Additional Information (Detail) - Subsequent Event $ in Millions | Oct. 14, 2025 USD ($)
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Subsequent Event [Line Items] |
Secured convertible note | $ 8.0
Maturity Period | 5 years
Accrues interest rate | 4.10%

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- Definition Accrues interest rate. + References No definition available. + Details
Name: | cars_AccruesInterestRate
Namespace Prefix: | cars_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Maturity of convertible note. + References No definition available. + Details
Name: | cars_MaturityOfConvertibleNote
Namespace Prefix: | cars_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | instant

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- Definition Purchase of an secured convertible note. + References No definition available. + Details
Name: | cars_PurchaseOfAnSecuredConvertibleNote
Namespace Prefix: | cars_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 830 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481674/830-30-50-2 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 855 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org/1943274/2147483399/855-10-50-2 + Details
Name: | us-gaap_SubsequentEventLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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