Financial Instruments (Fair Values of Financial Instruments) (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016	Aug. 01, 2016
Total financial instruments	$ 1,952	$ 3,305
Significant Other Observable Inputs (Level 2) [Member]
Total financial instruments	1,952	3,305
Warrants [Member]
Total financial instruments	1,952	3,305
Warrants [Member] | Significant Other Observable Inputs (Level 2) [Member]
Total financial instruments	$ 1,952	$ 3,305
Success Fee [Member]
Total financial instruments			$ 0