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Debt - Interest Expense (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Convertible Notes | 2016 Convertible Notes    
Interest expense    
Contractual interest expense $ 16,483 $ 11,426
Amortization of debt discount 2,381 10,421
Amortization of deferred financing $ 165 $ 555
Effective interest rate of the liability component 10.63% 10.85%
Senior Notes    
Interest expense    
Effective interest rate of the liability component 10.16% 10.48%