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Liabilities - Convertible Senior Notes Carrying Value (Details) - USD ($)
$ in Thousands
Mar. 31, 2022
Dec. 31, 2021
Nov. 17, 2020
May 18, 2020
Jan. 10, 2017
Debt          
Principal amount $ 277,673 $ 277,673      
Unamortized debt discount/transaction costs (3,737) (48,235)      
Net carrying value 273,936 229,438      
2023 Notes          
Debt          
Principal amount 20,173 20,173     $ 345,000
Unamortized debt discount/transaction costs (77) (967)      
Net carrying value 20,096 19,206      
2025 Notes          
Debt          
Principal amount 132,500 132,500 $ 132,500    
Unamortized debt discount/transaction costs (1,334) (17,302)      
Net carrying value 131,166 115,198      
2027 Notes          
Debt          
Principal amount 125,000 125,000   $ 125,000  
Unamortized debt discount/transaction costs (2,326) (29,966)      
Net carrying value $ 122,674 $ 95,034