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Debt - Additional Information (Details)
3 Months Ended 9 Months Ended
May 15, 2020
USD ($)
day
$ / shares
Feb. 07, 2020
USD ($)
Sep. 30, 2021
USD ($)
Jun. 30, 2021
day
Sep. 30, 2022
USD ($)
Sep. 30, 2021
USD ($)
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         $ 852,969,000     $ 711,437,000      
Decrease to additional paid-in capital     $ (9,538,400,000)   (10,127,487,000) $ (9,538,400,000)   (9,706,293,000)      
Accumulated deficit     (8,079,399,000)   (9,352,463,000) (8,079,399,000)   (8,362,572,000)      
Repayments of debt         51,961,000 $ 33,982,000          
Other financing outstanding amount         0            
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         $ 22,600,000            
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         $ 739,870,000     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       739,870,000     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 debt discount and debt issuance cost         7,628,000     143,181,000      
Aggregate principal amount     $ 2,000                
Fair value of debt         256,400,000            
Fair value of long-term debt         639,300,000            
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         36,786,000     75,680,000      
Fair value of long-term debt         $ 40,400,000            
Non-Revolving Loan | 2-year U.S Treasury note                      
Debt Instrument                      
Debt term   24 months                  
Variable interest percentage   3.40%                  
Non-Revolving Loan | 3-year U.S Treasury note                      
Debt Instrument                      
Debt term   36 months                  
Variable interest percentage   3.40%                  
Non-Revolving Loan | 5-year U.S Treasury note                      
Debt Instrument                      
Debt term   48 months                  
Variable interest percentage   3.40%                  
Non-Revolving Loan | Minimum                      
Debt Instrument                      
Interest rate         2.88%            
Debt term   24 months                  
Non-Revolving Loan | Maximum                      
Debt Instrument                      
Interest rate         4.84%            
Debt term   48 months                  
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         $ 76,313,000     $ 31,440,000      
Fair value of long-term debt         $ 73,700,000            
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   12 months                  
Master Vehicle Loan | Maximum                      
Debt Instrument                      
Interest rate         5.85%            
Debt term   48 months                  
Master Vehicle Loan | Flexdrive Services, LLC                      
Debt Instrument                      
Maximum borrowing capacity   $ 50,000,000