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Debt - Interest Expense (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Non-Cash Interest Expense      
Amortization of debt discount/transaction costs $ 962 $ 13,819 $ 13,792
Total Interest Expense 10,832 26,282 24,640
2023 Notes      
Cash Interest Expense      
Coupon interest expense 545 3,138 7,390
Non-Cash Interest Expense      
Amortization of debt discount/transaction costs 97 4,932 10,887
Estimated fair value $ 19,500    
Convertible Debt, Fair Value by Fair Value Hierarchy Level Level 2    
2025 Notes      
Cash Interest Expense      
Coupon interest expense $ 4,637 4,637 554
Non-Cash Interest Expense      
Amortization of debt discount/transaction costs 457 4,795 546
Estimated fair value $ 143,600    
Convertible Debt, Fair Value by Fair Value Hierarchy Level Level 2    
2027 Notes      
Cash Interest Expense      
Coupon interest expense $ 4,688 4,688 2,904
Non-Cash Interest Expense      
Amortization of debt discount/transaction costs 408 $ 4,092 $ 2,359
Estimated fair value $ 192,000    
Convertible Debt, Fair Value by Fair Value Hierarchy Level Level 2