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Significant Accounting Policies - Additional Information (Detail)
 3 Months Ended 9 Months Ended
Sep. 30, 2021
USD ($)
Sep. 30, 2020
USD ($)
Sep. 30, 2021
USD ($)
segment
Sep. 30, 2020
USD ($)
Jul. 20, 2021
Dec. 31, 2020
USD ($)
May 01, 2020
Apr. 30, 2020
Accounting Policies [Abstract]                
Number of reportable segments | segment     1          
Accounts, Notes, Loans and Financing Receivable [Line Items]                
Accrual period for financing receivables     60 days          
Off-balance sheet active finance receivables           $ 19,722,000    
Reserve for repurchase liabilities           4,241,000    
Restricted cash balance held in a federally insured bank account           3,069,000    
Restricted cash balance payable balance           784,000    
Finance receivables originated through the bank partnership arrangements, percentage     88.00% 61.00%        
Finance receivables originated through the bank partnership arrangements $ 7,976,000   $ 7,976,000     3,307,000    
Percent of scheduled payment considered as a qualifying payment             90.00% 50.00%
Property, Plant and Equipment [Line Items]                
Development and capitalized software costs 3,823,000 $ 2,346,000 9,896,000 $ 6,470,000        
Capitalized software costs, amortization expense 2,468,000 $ 1,579,000 6,588,000 $ 4,229,000        
Percent of tax benefits with provided payment         0.90      
Percent of tax benefits retained by company         0.10      
Tax receivable agreement liability 22,866,000   $ 22,866,000     $ 0    
Recency delinquency                
Accounts, Notes, Loans and Financing Receivable [Line Items]                
Accrual period for financing receivables     60 days          
Contractual delinquency                
Accounts, Notes, Loans and Financing Receivable [Line Items]                
Accrual period for financing receivables     90 days          
Minimum                
Property, Plant and Equipment [Line Items]                
Useful life     3 years          
Maximum                
Property, Plant and Equipment [Line Items]                
Useful life     5 years          
Ohio                
Accounts, Notes, Loans and Financing Receivable [Line Items]                
Finance receivables remaining under CSO program 0   $ 0          
Texas                
Accounts, Notes, Loans and Financing Receivable [Line Items]                
Finance receivables remaining under CSO program $ 0   $ 0          
Existing Equity Holders                
Schedule Of Reverse Recapitalization [Line Items]                
Ownership interest retained 87.80%   87.80%