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Related Party Transactions (Details) - USD ($)
3 Months Ended 8 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Sep. 30, 2020
Dec. 31, 2020
Related Party Transactions        
Revenue $ 65,105,000 $ 78,917,000    
Revenue   1,247,000    
Contra revenue 297,000      
USAA        
Related Party Transactions        
Revenue     $ 20,000,000  
USAA        
Related Party Transactions        
Revenue   1,700,000    
Amounts due to or from related party $ 0     $ 0
USAA | Sales and marketing        
Related Party Transactions        
Costs under related party agreements   2,000,000.0    
Accu-Trade        
Related Party Transactions        
Ownership percent 20.00%      
Due to related parties $ (1,000,000.0)     $ (900,000)
Accu-Trade | Contra-revenue        
Related Party Transactions        
Contra revenue 300,000 400,000    
Accu-Trade | Cost of revenue        
Related Party Transactions        
Costs under related party agreements $ 1,200,000 $ 300,000