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Leases - Additional Information (Details) - USD ($) $ in Thousands | 1 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
May 31, 2016 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2019 | Jan. 01, 2019
Leases [Abstract] |  |  |  |  |
Lease expiration date | 2031-06 |  |  |  |
Lease escalate percentage per year | 2.50% |  |  |  |
Operating lease assets |  |  |  | $ 16,900 | $ 18,200
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List] |  |  |  | us-gaap:InvestmentsAndOtherNoncurrentAssets |
Operating lease liabilities |  |  |  | $ 33,573 | $ 35,000
Operating Lease, Liability, Current, Statement of Financial Position [Extensible List] |  |  |  | us-gaap:OtherAccruedLiabilitiesCurrent |
Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List] |  |  |  | us-gaap:OtherLiabilitiesNoncurrent |
Rent expense |  | $ 8,200 | $ 7,300 |  |

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- Definition Lease expiration date. + References No definition available. + Details
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Namespace Prefix: | cars_
Data Type: | xbrli:gYearMonthItemType
Balance Type: | na
Period Type: | duration

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- Definition Operating lease annual rent escalation percentage. + References No definition available. + Details
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Namespace Prefix: | cars_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Amount of rent expense incurred for leased assets, including but not limited to, furniture and equipment, that is not directly or indirectly associated with the manufacture, sale or creation of a product or product line. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- References No definition available. + Details
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Namespace Prefix: | us-gaap_
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- Definition Present value of lessee's discounted obligation for lease payments from operating lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 45 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=77888419&loc=SL77918627-209977 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Indicates line item in statement of financial position that includes current operating lease liability. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=77888419&loc=SL77918631-209977 + Details
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Balance Type: | na
Period Type: | instant

X
- Definition Indicates line item in statement of financial position that includes noncurrent operating lease liability. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=77888419&loc=SL77918631-209977 + Details
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- Definition Amount of lessee's right to use underlying asset under operating lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 45 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=77888419&loc=SL77918627-209977 + Details
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- Definition Indicates line item in statement of financial position that includes operating lease right-of-use asset. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=77888419&loc=SL77918631-209977 + Details
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