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Debt - Additional Information (Details)
3 Months Ended
May 15, 2020
USD ($)
day
$ / shares
Feb. 07, 2020
USD ($)
Mar. 31, 2022
USD ($)
day
Sep. 30, 2021
USD ($)
Jan. 01, 2022
USD ($)
Dec. 31, 2021
USD ($)
Sep. 17, 2020
USD ($)
May 12, 2020
$ / shares
Mar. 11, 2019
USD ($)
Debt Instrument                  
Share price (in dollars per share) | $ / shares               $ 29.53  
Net carrying amount of liability component     $ 843,325,000     $ 711,437,000      
Decrease to additional paid-in capital     (9,721,213,000)     (9,706,293,000)      
Accumulated deficit     (8,553,016,000)     (8,362,572,000)      
Other financing outstanding amount     3,900,000            
Adjustment                  
Debt Instrument                  
Decrease to additional paid-in capital         $ 140,000,000        
Accumulated deficit     6,500,000            
Flexdrive Services, LLC | Revolving Credit Facility                  
Debt Instrument                  
Maximum exposure to loss under terms of the guarantee     $ 11,600,000            
Procurement Provider | Revolving Credit Facility                  
Debt Instrument                  
Maximum borrowing capacity             $ 50,000,000   $ 95,000,000
Convertible Senior Notes Due 2025                  
Debt Instrument                  
Interest rate     1.50%            
Net carrying amount of liability component     $ 738,439,000     604,317,000      
Convertible Senior Notes Due 2025 | Convertible Debt                  
Debt Instrument                  
Aggregate principal $ 747,500,000                
Interest rate 1.50%                
Net proceeds from issuance of convertible debt $ 733,200,000                
Conversation rate 0.0260491                
Initial conversion price (in dollars per share) | $ / shares $ 38.39                
Initial conversion price of convertible debt, premium percentage 30.00%                
Limitation on sale of common stock, sale price threshold, number of trading days | day 20   20            
Number of consecutive business days 5 days                
Redemption price percentage 100.00%                
Net carrying amount of liability component $ 558,300,000   $ 738,439,000     604,317,000      
Carrying value of equity component $ 189,200,000                
Effective interest rate 8.00%                
Debt and equity components of convertible loans, discounts and commissions payable $ 14,300,000                
Unamortized deferred issuance cost     9,100,000            
Aggregate principal amount       $ 2,000          
If-converted value in excess of principal     747,700,000            
Fair value of long-term debt     $ 917,200,000            
Cost of capped call transactions $ 132,700,000                
Initial cap price (in dollars per share) | $ / shares $ 73.83                
Initial cap price premium percentage 150.00%                
Convertible Senior Notes Due 2025 | Convertible Debt | Adjustment                  
Debt Instrument                  
Aggregate principal         $ 133,500,000        
Convertible Senior Notes Due 2025 | Convertible Debt | Debt Instrument, Redemption, Period One                  
Debt Instrument                  
Limitation on sale of common stock, sale price threshold, trading period | day 30   30            
Threshold percentage of stock price trigger 130.00%   130.00%            
Convertible Senior Notes Due 2025 | Convertible Debt | Debt Instrument, Redemption, Period Two                  
Debt Instrument                  
Limitation on sale of common stock, sale price threshold, trading period | day 5                
Threshold percentage of stock price trigger 98.00%                
Non-Revolving Loan                  
Debt Instrument                  
Net carrying amount of liability component     $ 66,106,000     75,680,000      
Fair value of long-term debt     $ 65,400,000            
Non-Revolving Loan | Minimum                  
Debt Instrument                  
Interest rate     2.60%            
Debt term (in months)   24 months              
Non-Revolving Loan | Minimum | LIBOR                  
Debt Instrument                  
Variable interest percentage   2.51%              
Non-Revolving Loan | Maximum                  
Debt Instrument                  
Interest rate     5.25%            
Debt term (in months)   48 months              
Non-Revolving Loan | Maximum | LIBOR                  
Debt Instrument                  
Variable interest percentage   2.74%              
Non-Revolving Loan | Flexdrive Services, LLC                  
Debt Instrument                  
Maximum borrowing capacity   $ 130,000,000              
Master Vehicle Loan                  
Debt Instrument                  
Net carrying amount of liability component     $ 38,780,000     $ 31,440,000      
Fair value of long-term debt     $ 37,800,000            
Interest rate swap term   3 years              
Variable interest spread rate   2.10%              
Master Vehicle Loan | LIBOR                  
Debt Instrument                  
Spread on variable rate   3.00%              
Master Vehicle Loan | Minimum                  
Debt Instrument                  
Interest rate     2.60%            
Debt term (in months)   12 months              
Master Vehicle Loan | Maximum                  
Debt Instrument                  
Interest rate     6.75%            
Debt term (in months)   48 months              
Master Vehicle Loan | Flexdrive Services, LLC                  
Debt Instrument                  
Maximum borrowing capacity   $ 50,000,000