Going Concern (Details Textual) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Going Concern Uncertainty Financial Condition And Managements Plans [Line Items]
Working Capital Deficit	$ 10,900		$ 10,900
Retained Earnings (Accumulated Deficit)	(122,637)		(122,637)		$ (113,536)
Net Income (Loss) Attributable to Parent	(4,717)	$ (4,936)	(9,101)	$ (8,689)
Net Cash Provided by (Used in) Operating Activities			(6,849)	$ (4,453)
Cash	$ 1,500		$ 1,500