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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

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