Nature of Business and Liquidity (Details Narrative) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018	Dec. 30, 2017
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Cash flows from operating activities	$ (12,069)	$ (10,537)
Cash and cash equivalents	$ 19,760	$ 33,389	$ 22,616	$ 45,389