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Commitments and Contingencies - Additional Information (Details) | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2023 USD ($) Days | Dec. 31, 2022 USD ($) | Dec. 31, 2021 USD ($) | Nov. 14, 2023 ft² | Feb. 03, 2023 ft²
Commitments And Contingencies [Line Items] |  |  |  |  |
Lease term description | non-cancellable lease terms through 2033 |  |  |  |
Sublease term description | non-cancellable lease terms through 2025 |  |  |  |
Lessee, Operating Lease, Existence of Option to Extend [true false] | true |  |  |  |
Operating lease, option to extend | option to extend the lease term up to two additional periods of five years |  |  |  |
Sublease option to extend | option to extend the sublease term up to one additional period of three years. |  |  |  |
Restricted cash | $ 2,563,000 | $ 14,615,000 |  |  |
Lease costs | 34,218,000 | 16,732,000 | $ 15,844,000 |  |
Sublease income | $ 1,897,000 | $ 1,809,000 | 0 |  |
Weighted average remaining lease term | 13 years 1 month 6 days | 7 years 1 month 6 days |  |  |
Weighted average discount rate | 5.70% | 4.90% |  |  |
Maximum potential amount of future payments required to make under guarantees | $ 10,158,000 | $ 31,056,000 | 76,075,000 |  |
Guarantee income | 1,890,000 | 10,026,000 | 5,537,000 |  |
Exercise of guarantee net loss | 417,000 | 4,568,000 |  |  |
1001 Boylston Street |  |  |  |  |
Commitments And Contingencies [Line Items] |  |  |  |  |
Expected contractual obligations and commitments in connection with lease net of tenant reimbursements | 69,815,000 |  |  |  |
Contractual obligations incurred expenses | 40,561,000 |  |  |  |
Tenant improvement allowance reimbursements | 2,891,000 |  |  |  |
Contractual obligations capitalized amount | 40,325,000 |  |  |  |
Gross contract commitments | $ 46,473,000 |  |  |  |
Lessee, Operating Lease, Existence of Option to Extend [true false] | true |  |  |  |
Operating lease, option to extend | options to extend the lease term for two additional periods of five years |  |  |  |
Area of land | ft² |  |  |  | 30,913 | 225,428
1001 Boylston Street | Letter of Credit Facility |  |  |  |  |
Commitments And Contingencies [Line Items] |  |  |  |  |
Letter of credit facility | $ 9,627,000 |  |  |  |
1001 Boylston Street | Property and Equipment, Net |  |  |  |  |
Commitments And Contingencies [Line Items] |  |  |  |  |
Contractual obligations capitalized amount | 39,835,000 |  |  |  |
1001 Boylston Street | Prepaid Expenses, Prepaid Income Taxes and Other Current Assets |  |  |  |  |
Commitments And Contingencies [Line Items] |  |  |  |  |
Contractual obligations capitalized amount | $ 490,000 |  |  |  |
Car Offer |  |  |  |  |
Commitments And Contingencies [Line Items] |  |  |  |  |
Guarantees, description | provides certain guarantees to dealers through products such as its 45-Day Guarantee and OfferGuard service offerings on the CarOffer platform, which are accounted for under ASC 460. |  |  |  |
Number of days guarantee period | Days | 45 |  |  |  |
Maximum potential amount of future payments required to make under guarantees | $ 10,158,000 | $ 31,056,000 | $ 76,075,000 |  |

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- Definition The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -SubTopic 10 -Topic 210 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 944 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(16)(a)(2)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479440/944-210-S99-1 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 942 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479853/942-210-S99-1 + Details
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- Definition Weighted average remaining lease term for operating lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 53 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479589/842-20-55-53 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Subparagraph (g)(3) -Publisher FASB -URI https://asc.fasb.org//1943274/2147478964/842-20-50-4 + Details
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