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Summary of Significant Accounting Policies - Additional Information (Details) - USD ($)
$ in Thousands
 3 Months Ended
Apr. 22, 2021
Mar. 31, 2022
Mar. 31, 2021
Jan. 01, 2022
Dec. 31, 2021
Significant Accounting Policies          
Accounts receivable   $ 187,000     $ 196,200
Allowance for credit loss   9,200     9,300
Revenue   875,575 $ 608,960    
Sales and marketing   126,329 78,620    
Net carrying amount of liability component   843,325     711,437
Additional paid-in capital   9,721,213     9,706,293
Accumulated deficit   (8,553,016)     (8,362,572)
Transfer of certain legacy auto insurance liabilities   0 0    
DARAG Bermuda LTD          
Significant Accounting Policies          
Reserves for current period $ 183,200        
DARAG Bermuda LTD | Pacific Valley Insurance Company, Inc.          
Significant Accounting Policies          
Transfer of certain legacy auto insurance liabilities 251,300        
Reinsurance obligations 434,500        
Unearned premiums $ 271,500        
Convertible Senior Notes Due 2025          
Significant Accounting Policies          
Net carrying amount of liability component   738,439     $ 604,317
Cumulative Effect, Period of Adoption, Adjustment          
Significant Accounting Policies          
Additional paid-in capital       $ 140,000  
Accumulated deficit       6,500  
Cumulative Effect, Period of Adoption, Adjustment | Convertible Senior Notes Due 2025          
Significant Accounting Policies          
Net carrying amount of liability component       133,500  
Adjustment          
Significant Accounting Policies          
Additional paid-in capital       $ (140,000)  
Accumulated deficit   6,500      
Driver Passenger and Light Vehicle Renter Incentive Programs          
Significant Accounting Policies          
Sales and marketing   24,900 13,100    
Driver Passenger and Light Vehicle Renter Incentive Programs | Adjustment          
Significant Accounting Policies          
Revenue   $ (349,900) $ (196,200)