Nature of Business and Liquidity (Details Narrative) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 30, 2017	Dec. 31, 2016
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Operating loss	$ (33,172)	$ (16,377)
Net loss	(33,316)	(11,378)
Cash and cash equivalents	$ 22,616	$ 45,389	$ 1,642