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Convertible Notes Payable - Narrative (Details)
1 Months Ended 12 Months Ended
Sep. 12, 2017
USD ($)
shares
day
$ / shares
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Aug. 14, 2017
USD ($)
Debt Instrument [Line Items]        
Net carrying amount   $ 195,591,000 $ 179,806,000  
3.00% Convertible notes | Convertible debt        
Debt Instrument [Line Items]        
Aggregate principal amount $ 5,000,000.0     $ 300,000,000.0
Debt instrument stated rate 3.00% 3.00%   3.00%
Debt issuance costs, gross $ 9,400,000      
Debt instrument term 7 years 7 years    
Conversion rate of common stock (in shares) | shares 20.4891      
Debt instrument conversion price (in dollars per share) | $ / shares $ 48.81      
Number of convertible shares of common stock (in shares) | shares 6,249,176      
Net carrying amount   $ 195,591,000 179,806,000 $ 166,300,000
Debt instrument, convertible, carrying amount of equity component   134,450,000 134,450,000 138,700,000
Long-term debt   $ 305,000,000 $ 305,000,000 $ 305,000,000.0
Debt instrument remaining discount amortization period 7 years 7 years    
Debt instrument, interest rate, effective percentage   13.04%    
Long-term debt, fair value   $ 259,000,000.0    
Notes payable | 3.00% Convertible notes | Convertible debt        
Debt Instrument [Line Items]        
Debt issuance costs, gross $ 4,300,000      
Additional Paid-In Capital Amount | 3.00% Convertible notes | Convertible debt        
Debt Instrument [Line Items]        
Debt issuance costs, gross $ 5,100,000      
Debt Instrument, Redemption, Period One | 3.00% Convertible notes | Convertible debt        
Debt Instrument [Line Items]        
Debt instrument, convertible, threshold consecutive or non-consecutive trading days 20 days      
Debt instrument, convertible, threshold consecutive trading days | day 30      
Debt instrument, convertible, threshold percentage of stock price trigger 130.00%      
Debt Instrument, Redemption, Period Two | 3.00% Convertible notes | Convertible debt        
Debt Instrument [Line Items]        
Debt instrument, convertible, threshold consecutive trading days | day 5      
Debt instrument, convertible, threshold percentage of stock price trigger 98.00%      
Debt instrument, convertible, threshold trading days | day 5      
Debt Instrument, Redemption, Period Three | 3.00% Convertible notes | Convertible debt        
Debt Instrument [Line Items]        
Debt instrument, convertible, threshold consecutive or non-consecutive trading days 20 days      
Debt instrument, convertible, threshold consecutive trading days | day 30      
Debt instrument, convertible, threshold percentage of stock price trigger 130.00%      
Debt instrument, convertible, threshold consecutive trading days, redemption notice period | day 5