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Related-Party Transactions (Details) - USD ($)
3 Months Ended 6 Months Ended 12 Months Ended
Jan. 20, 2021
Sep. 23, 2019
Jun. 30, 2021
Jun. 30, 2020
Mar. 31, 2020
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2020
Redeemable Class A Common Stock                
Related Party Transaction [Line Items]                
Conversion of convertible securities         $ (4,500,000)      
Reclassifications of temporary to permanent equity             $ 4,500,000  
Affiliated Entity                
Related Party Transaction [Line Items]                
Related party transaction, expenses from transactions with related party     $ 700,000 $ 300,000   $ 1,500,000 1,100,000  
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   $ 0
Affiliated Entity | Identity Verification Services                
Related Party Transaction [Line Items]                
Related party transaction, purchases from related party     $ 200,000 $ 100,000   $ 300,000 $ 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
Proceeds from 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               2.20%
Management | Nonrecourse Related-Party Promissory Notes | Maximum                
Related Party Transaction [Line Items]                
Related party transaction, rate               3.00%
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