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Convertible Senior Notes (Details)
9 Months Ended
Feb. 14, 2020
USD ($)
day
$ / shares
Sep. 30, 2020
USD ($)
Sep. 30, 2019
USD ($)
Debt Instrument [Line Items]      
Proceeds from issuance of convertible senior notes   $ 287,500,000 $ 0
Convertible Debt | 2027 Notes      
Debt Instrument [Line Items]      
Principal amount $ 287,500,000    
Stated percentage 1.75%    
Proceeds from issuance of convertible senior notes $ 278,300,000    
Threshold trading days | day 20    
Threshold consecutive trading days | day 30    
Threshold percentage of stock price trigger 130.00%    
Conversion ratio 0.0308804    
Conversion price (in dollars per share) | $ / shares $ 32.38    
Redemption price, percentage 100.00%    
Long-term debt $ 175,400,000 $ 177,377,000  
Effective percentage   9.50%  
Carrying amount of equity component 112,100,000    
Debt issuance costs 9,200,000    
Debt issuance costs, liability component 5,600,000    
Debt issuance costs, equity component $ 3,600,000    
Convertible Debt | 2027 Notes | Debt Conversion Terms One      
Debt Instrument [Line Items]      
Threshold trading days | day 20    
Threshold consecutive trading days | day 30    
Threshold percentage of stock price trigger 130.00%    
Convertible Debt | 2027 Notes | Debt Conversion Terms Two      
Debt Instrument [Line Items]      
Threshold trading days | day 5    
Threshold consecutive trading days | day 10    
Threshold percentage of stock trading price 98.00%