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Convertible Notes Payable - Narrative (Details) - Convertible debt - 3.00% Convertible notes
1 Months Ended
Sep. 12, 2017
USD ($)
business_day
day
$ / shares
Mar. 31, 2020
USD ($)
Aug. 14, 2017
USD ($)
Debt Instrument [Line Items]      
Aggregate principal amount $ 5,000,000.0   $ 300,000,000
Debt instrument stated rate 3.00%   3.00%
Debt issuance costs $ 9,400,000    
Debt instrument term 7 years    
Conversion ratio 0.0204891    
Initial conversion price (in dollars per share) | $ / shares $ 48.81    
Initial carrying amount   $ 199,880,000 $ 166,300,000
Equity component   134,450,000 138,700,000
Proceeds from the issuance of debt   $ 305,000,000 $ 305,000,000.0
Debt discount, remaining discount amortization period 7 years    
Effective interest rate   13.04%  
Estimated fair value   $ 215,600,000  
Stock price trigger at greater than or equal to 130%      
Debt Instrument [Line Items]      
Consecutive or non-consecutive trading days 20 days    
Consecutive trading days | day 30    
Percentage of stock price trigger 130.00%    
Stock price trigger less than 98%      
Debt Instrument [Line Items]      
Consecutive trading days | day 5    
Percentage of stock price trigger 98.00%    
Trading days | business_day 5    
Stock price trigger at greater than or equal to 130%, on or after September 1, 2021      
Debt Instrument [Line Items]      
Consecutive or non-consecutive trading days 20 days    
Consecutive trading days | day 30    
Percentage of stock price trigger 130.00%    
Consecutive trading days, redemption notice period | day 5    
Additional Paid-In Capital      
Debt Instrument [Line Items]      
Debt issuance costs $ 4,300,000    
Convertible notes      
Debt Instrument [Line Items]      
Debt issuance costs $ 5,100,000