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Unfavorable Contracts Liability - Summary of Unfavorable Contracts Liability Activity (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018
Unfavorable Contracts Liability [Abstract] |  |
December 31, 2018 | $ 18,885 |
Amortization into Wholesale revenue | (1,358) | $ (25,200)
Amortization into Affiliate revenue share | (17,527) |
December 31, 2019 | $ 0 | $ 18,885

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- Definition Amortization of unfavorable contracts liability into affiliate revenue share expense. + References No definition available. + Details
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- Definition Amortization of unfavorable contracts liability into wholesale revenue. + References No definition available. + Details
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Namespace Prefix: | cars_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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- Definition Unfavorable contracts liability. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Unfavorable contracts liability. + References No definition available. + Details
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Data Type: | xbrli:stringItemType
Balance Type: | na
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