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Debt - Interest Expense (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Convertible Notes | 2016 Convertible Notes    
Interest expense    
Contractual interest expense $ 30,473 $ 20,933
Amortization of debt discount 1,462 1,267
Amortization of deferred financing $ 1,028 $ 527
Effective interest rate of the liability component 0.00% 10.60%
Senior Notes | Senior Secured Term Loan due 2026:    
Interest expense    
Effective interest rate of the liability component 8.40% 8.40%