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Liabilities - Convertible Senior Notes - Interest Expense (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Non-Cash Interest Expense    
Amortization of debt discount/transaction costs $ 238 $ 3,514
Total Interest Expense 2,704 6,734
2023 Notes    
Cash Interest Expense    
Coupon interest expense 136 889
Non-Cash Interest Expense    
Amortization of debt discount/transaction costs $ 24 1,365
Convertible Debt, Fair Value by Fair Value Hierarchy Level Level 2  
Estimated fair value $ 20,700  
2025 Notes    
Cash Interest Expense    
Coupon interest expense 1,159 1,159
Non-Cash Interest Expense    
Amortization of debt discount/transaction costs $ 113 1,162
Convertible Debt, Fair Value by Fair Value Hierarchy Level Level 2  
Estimated fair value $ 180,000  
2027 Notes    
Cash Interest Expense    
Coupon interest expense 1,172 1,172
Non-Cash Interest Expense    
Amortization of debt discount/transaction costs $ 100 $ 987
Convertible Debt, Fair Value by Fair Value Hierarchy Level Level 2  
Estimated fair value $ 259,900