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Fair Value Measurements - Narrative (Details)
Sep. 30, 2020
USD ($)
Jun. 17, 2020
USD ($)
Embedded exchange feature    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
10 percent decrease in stock price volatility, fair value $ 42,400,000  
10 percent increase in stock price volatility, fair value 76,400,000  
Capped call derivatives    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
10 percent decrease in stock price volatility, fair value 29,300,000  
10 percent increase in stock price volatility, fair value $ 42,300,000  
Senior Notes    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Debt instrument, face amount   $ 287,500,000
2020 Cash Exchangeable Senior Notes | Senior Notes    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Debt instrument, face amount   $ 287,500,000
Measurement Input, Stock Price Volatility | Embedded exchange feature    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Derivative liability, measurement input 0.37  
Measurement Input, Stock Price Volatility | Capped call derivatives    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Derivative liability, measurement input 0.37