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Debt - Carrying Value (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Nov. 17, 2020
May 18, 2020
Jan. 10, 2017
Debt          
Principal amount $ 277,673 $ 389,195      
Unamortized debt discount/transaction costs (48,235) (68,080)      
Net carrying value 229,438 321,115      
2023 Notes          
Debt          
Principal amount 20,173 131,695     $ 345,000
Unamortized debt discount/transaction costs (967) (11,925)      
Net carrying value 19,206 119,770      
2025 Notes          
Debt          
Principal amount 132,500 132,500 $ 132,500    
Unamortized debt discount/transaction costs (17,302) (22,097)      
Net carrying value 115,198 110,403      
2027 Notes          
Debt          
Principal amount 125,000 125,000   $ 125,000  
Unamortized debt discount/transaction costs (29,966) (34,058)      
Net carrying value $ 95,034 $ 90,942