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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