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Convertible Senior Notes, Net (Details)
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2021
USD ($)
$ / shares
Jun. 30, 2020
USD ($)
Jun. 30, 2021
USD ($)
$ / shares
Jun. 30, 2020
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
offering
Dec. 31, 2020
USD ($)
Debt Instrument [Line Items]              
Proceeds from issuance of senior secured notes     $ 500,000,000 $ 0      
Unamortized discount $ 4,583,000   $ 4,583,000        
Common Stock              
Debt Instrument [Line Items]              
Share price (in dollars per share) | $ / shares $ 15.95   $ 15.95        
Convertible Debt              
Debt Instrument [Line Items]              
Debt instrument, face amount $ 575,000,000   $ 575,000,000       $ 575,000,000
Interest expense 7,200,000   14,400,000        
Non-cash interest expense 1,600,000 $ 1,500,000 3,100,000 $ 3,000,000.0      
Convertible Debt | 2019 and 2022 Notes | Additional Paid-In-Capital              
Debt Instrument [Line Items]              
Conversions of convertible senior notes for common stock     15,400,000        
Convertible Debt | 2022 Notes              
Debt Instrument [Line Items]              
Number of debt offerings issued | offering           2  
Debt instrument, face amount           $ 345,000,000.0 $ 345,000,000
Stated interest rate           4.75% 4.75%
Proceeds from issuance of senior secured notes           $ 337,500,000  
Convertible senior notes, net 341,700,000   341,700,000        
Unamortized discount 3,300,000   3,300,000        
Convertible Debt | 2022 Notes | Additional Paid-In-Capital              
Debt Instrument [Line Items]              
Conversions of convertible senior notes for common stock     11,000,000.0        
Convertible Debt | 2023 Notes              
Debt Instrument [Line Items]              
Debt instrument, face amount         $ 230,000,000.0   $ 230,000,000
Stated interest rate         5.375%   5.38%
Proceeds from issuance of senior secured notes         $ 223,700,000    
Convertible senior notes, net 226,100,000   226,100,000        
Unamortized discount $ 3,900,000   3,900,000        
Convertible Debt | 2023 Notes | Additional Paid-In-Capital              
Debt Instrument [Line Items]              
Conversions of convertible senior notes for common stock     $ 4,400,000