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Related-Party Transactions (Details) - USD ($)
3 Months Ended 12 Months Ended
Jan. 20, 2021
Sep. 23, 2019
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Related Party Transaction [Line Items]          
Repayment of promissory notes associated with vested and unvested shares     $ 1,193,000 $ 0  
Redeemable Class A Common Stock          
Related Party Transaction [Line Items]          
Conversion of convertible securities       (4,500,000)  
Affiliated Entity          
Related Party Transaction [Line Items]          
Related party transaction, expenses from transactions with related party     800,000 800,000  
Affiliated Entity | Redeemable Common Stock Transaction          
Related Party Transaction [Line Items]          
Sale of stock, put right period   6 months      
Affiliated Entity | Operational Support          
Related Party Transaction [Line Items]          
Accounts payable, related parties     0   $ 0
Affiliated Entity | Identity Verification Services          
Related Party Transaction [Line Items]          
Related party transaction, purchases from related party     100,000 $ 100,000  
Accounts payable, related parties     $ 100,000   $ 100,000
Management | Nonrecourse Related-Party Promissory Notes          
Related Party Transaction [Line Items]          
Options outstanding (in shares)         16,345,627
Share-based compensation arrangement by share-based payment award, options, outstanding, value         $ 7,200,000
Repayment of promissory notes associated with vested and unvested shares $ 1,200,000        
Forfeiture of related-party promissory notes (in shares) 370,734        
Management | Nonrecourse Related-Party Promissory Notes | Minimum          
Related Party Transaction [Line Items]          
Related party transaction, rate         2.21%
Management | Nonrecourse Related-Party Promissory Notes | Maximum          
Related Party Transaction [Line Items]          
Related party transaction, rate         3.02%
Chief Executive Officer And Director | Sale of Stock from CEO and Member Of Board of Directors          
Related Party Transaction [Line Items]          
Sale of stock, number of shares issued in transaction (in shares)   737,058      
Sale of stock, price per share (in dollars per share)   $ 6.11      
Sale of stock, consideration received on transaction   $ 4,500,000      
CEO And Director | Redeemable Common Stock Transaction          
Related Party Transaction [Line Items]          
Related party transaction, expenses from transactions with related party   $ 3,000,000.0