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Summary of Significant Accounting Policies - Additional Information (Details)
 12 Months Ended
Oct. 01, 2023
USD ($)
Apr. 01, 2023
Jan. 14, 2021
USD ($)
Dec. 31, 2023
USD ($)
Customer
Dec. 31, 2022
USD ($)
Customer
Dec. 31, 2021
USD ($)
Customer
Summary Of Significant Accounting Policies [Line Items]            
Write-offs in capitalized website development costs       $ 184,000    
Description of significant off-balance sheet risk       The Company has no significant off-balance sheet risk, such as foreign exchange contracts, option contracts, or other foreign hedging arrangements.    
Accounts receivable, net       $ 39,963,000 $ 46,817,000  
Other than temporary impairments recognized in statements of operations       0 0 $ 0
Restricted cash       2,563,000 14,615,000  
Impairment of goodwill $ 0     0 0 0
Sublease income       $ 1,897,000 1,809,000 0
Minimum percentage of tax position realized upon settlement       50.00%    
Unrecognized Tax Benefits       $ 812,000 $ 598,000 $ 0
Deferred tax expense on deferred tax assets and liabilities       $ 6,941,000    
Percentage of corporate alternative minimum tax       15.00%    
Effective tax rate       44.50% 27.70% 26.30%
Minimum average amount of adjusted financial income       $ 1,000,000,000    
Number of consecutive tax year period       3 years    
Percentage of excise tax imposed       1.00%    
Federal tax rate       21.00% 21.00% 21.00%
Pillar Two Legislation            
Summary Of Significant Accounting Policies [Line Items]            
Effective tax rate       15.00%    
Digital Wholesale            
Summary Of Significant Accounting Policies [Line Items]            
Write-offs in capitalized website development costs       $ 175,000    
U.S. Marketplace            
Summary Of Significant Accounting Policies [Line Items]            
Write-offs in capitalized website development costs       8,000 $ 165,000 $ 2,481,000
CarOffer            
Summary Of Significant Accounting Policies [Line Items]            
Business acquisition, percentage of equity interest acquired     51.00%     51.00%
Aggregate consideration amount     $ 69,510,000      
Caroffer Purchase Agreement | CarOffer            
Summary Of Significant Accounting Policies [Line Items]            
Aggregate consideration amount       75,000,000    
Trade Accounts Receivable            
Summary Of Significant Accounting Policies [Line Items]            
Accounts receivable, net       853,000 632,000  
Gross trade accounts receivable from receivables in transit from the third-party payment processor       2,868,000 7,122,000  
Receivables offset by payments received in advance       $ 2,015,000 $ 6,490,000  
Minimum            
Summary Of Significant Accounting Policies [Line Items]            
Estimated useful lives       3 years    
Maximum            
Summary Of Significant Accounting Policies [Line Items]            
Estimated useful lives       11 years    
Maximum | CarOffer            
Summary Of Significant Accounting Policies [Line Items]            
Business acquisition valuation period       1 year    
Sales Revenue, Net | Concentration of Credit Risk            
Summary Of Significant Accounting Policies [Line Items]            
Number of major customers | Customer       0 0 0
Net Accounts Receivable | Advertising Customers            
Summary Of Significant Accounting Policies [Line Items]            
Unbilled accounts receivable       $ 9,581,000 $ 7,150,000  
Net Accounts Receivable | Concentration of Credit Risk            
Summary Of Significant Accounting Policies [Line Items]            
Number of major customers | Customer       0 1  
Net Accounts Receivable | Concentration of Credit Risk | Minimum            
Summary Of Significant Accounting Policies [Line Items]            
Number of major customers | Customer       1,000 1,000  
Net Accounts Receivable | Concentration of Credit Risk | Customer One            
Summary Of Significant Accounting Policies [Line Items]            
Concentration of credit risk, percentage       10.00% 13.00%  
Net Accounts Receivable | Concentration of Credit Risk | Customer One | Minimum            
Summary Of Significant Accounting Policies [Line Items]            
Concentration of credit risk, percentage       10.00% 10.00%  
United States            
Summary Of Significant Accounting Policies [Line Items]            
Write-offs in capitalized website development costs         $ 165,000  
UK            
Summary Of Significant Accounting Policies [Line Items]            
Federal tax rate   25.00%   19.00%    
Website Development Costs            
Summary Of Significant Accounting Policies [Line Items]            
Write-offs in capitalized website development costs           $ 2,481,000
Software and website development costs capitalized       $ 20,789,000 14,496,000  
Amortization expense       $ 11,537,000 7,637,000 3,705,000
Estimated useful life       3 years    
Cost Of Revenue            
Summary Of Significant Accounting Policies [Line Items]            
Write-offs in capitalized website development costs           647,000
Internal Use Software            
Summary Of Significant Accounting Policies [Line Items]            
Software and website development costs capitalized       $ 4,850,000 4,388,000  
Amortization expense       $ 3,384,000 1,286,000 272,000
Estimated useful life       3 years    
Hosting Arrangements            
Summary Of Significant Accounting Policies [Line Items]            
Software and website development costs capitalized       $ 1,739,000 3,196,000  
Amortization expense       $ 1,962,000 $ 2,117,000 $ 1,761,000