Stockholders' Deficit (Details Narrative) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2019	Dec. 31, 2017	Dec. 31, 2018	Dec. 31, 2015	Nov. 10, 2015	Oct. 31, 2015
Common stock, authorized	100,000,000		100,000,000		100,000,000	100,000
Preferred stock, authorized				15,000,000	10,000,000	10,000
Preferred stock, par value (in dollars per share)					$ 0.001	$ 0.001
Common stock, shares, issued	23,560,864		23,471,999
Common stock, shares, outstanding	23,560,864		23,471,999
Cashless exercise of vested stock options	18,474
Settlement of compensation	$ 32
Warrants exercised	31,811
Common stock, par value (in dollars per share)	$ 0.001		$ 0.001		$ 0.001	$ .001
Common Stock Offering Warrants Issued
Settlement of compensation (in shares)	38,580
Common Stock [Member]
Aggregate number of common stock issued	88,865
Series A Preferred Stock [Member]
Preferred stock, authorized				7,515,000	2,000,000
Preferred stock, par value (in dollars per share)				$ 0.001	$ 0.001