Debt (Schedule of Debt) (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Convertible senior notes
Debt Instrument [Line Items]
Issuance Discount	$ (9,498)	$ (17,068)
Deferred Financing Costs	(1,607)	(2,857)
Net Carrying Value	$ 192,895	$ 184,075
Convertible senior notes | Initial Notes, due January 16, 2022
Debt Instrument [Line Items]
Stated Interest Rate	12.00%	12.00%
Effective Interest Rate	18.80%	18.80%
Issuance Discount	$ (8,200)	$ (14,703)
Deferred Financing Costs	(1,523)	(2,706)
Net Carrying Value	$ 143,777	$ 136,091
Convertible senior notes | Option Notes, due January 16, 2022
Debt Instrument [Line Items]
Stated Interest Rate	12.00%	12.00%
Effective Interest Rate	14.90%	14.90%
Issuance Discount	$ (1,298)	$ (2,365)
Deferred Financing Costs	(84)	(151)
Net Carrying Value	$ 49,118	$ 47,984
Secured Term Note | Secured Term Note
Debt Instrument [Line Items]
Stated Interest Rate	9.75%	9.75%
Effective Interest Rate	12.80%	12.20%
Deferred Financing Costs	$ (356)	$ (537)
Net Carrying Value	$ 12,644	$ 12,463