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Long-Term Debt (Schedule of Debt) (Details) - USD ($)
$ in Thousands
Mar. 31, 2020
Dec. 31, 2019
Long-term debt    
Net carrying value $ 240,732 $ 241,727
Less current portion 181,822 183,006
Long-term debt 58,910 58,721
Convertible Notes    
Long-term debt    
Senior Secured Notes 181,426 181,426
Unamortized discount (premium) and debt issuance costs 396 1,580
Net carrying value 181,822 183,006
2024 Notes    
Long-term debt    
Senior Secured Notes 61,351 61,351
Unamortized discount (premium) and debt issuance costs (2,441) (2,630)
Net carrying value $ 58,910 $ 58,721