Liquidity and Going Concern - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Cash	$ 1,589		$ 2,007
Working capital	2,284
Net loss	598	$ 1,285
Net cash used in operating activities	$ 408	$ 472