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Liabilities - Convertible Senior Notes (Details)
 3 Months Ended
Nov. 17, 2020
USD ($)
$ / shares
May 18, 2020
USD ($)
$ / shares
Jan. 10, 2017
USD ($)
$ / shares
Mar. 31, 2022
USD ($)
D
Convertible Notes        
Debt        
Multiples of principal holders may convert       1,000
Minimum threshold period | D       20
Consecutive trading days | D       30
Stock price trigger (as a percent)       130.00%
Trading days | D       5
Number of consecutive business days       5 days
Maximum percentage of common stock conversion       98.00%
2023 Notes        
Debt        
Conversion rate     0.0249800  
Conversion price (in dollars per share) | $ / shares     $ 40.03  
Measurement input     0.070  
Long-term Debt, Measurement Input     us-gaap:MeasurementInputDiscountRateMember  
Debt discount     $ 72,500,000  
Transaction costs     9,200,000  
Transaction costs allocated to the equity component     $ 1,900,000  
2025 Notes        
Debt        
Conversion rate 0.0416667      
Conversion price (in dollars per share) | $ / shares $ 24.00      
Measurement input 0.080      
Long-term Debt, Measurement Input us-gaap:MeasurementInputDiscountRateMember      
Debt discount $ 21,000,000.0      
Transaction costs 1,900,000      
Transaction costs allocated to the equity component $ 300,000      
2027 Notes        
Debt        
Conversion rate   0.0715372    
Conversion price (in dollars per share) | $ / shares   $ 13.98    
Measurement input   0.091    
Long-term Debt, Measurement Input   us-gaap:MeasurementInputDiscountRateMember    
Debt discount   $ 34,200,000    
Transaction costs   3,100,000    
Transaction costs allocated to the equity component   $ 800,000