STATEMENT OF CHANGES IN STOCKHOLDERS' EQUITY (DEFICIT) (Unaudited) - USD ($) $ in Thousands	Common Stock [Member]	Additional Paid-In Capital [Member]	Stock Subscription Payable [Member]	Accumulated Deficit [Member]	Total
Balance at beginning at Dec. 31, 2017	$ 16	$ 81,103		$ (73,597)	$ 7,522
Balance at beginning (in shares) at Dec. 31, 2017	16,404,195
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock for services	$ 1	27			28
Issuance of common stock for services (in shares)	94,151
Stock-based compensation		670			670
Issuance of common stock upon cashles exercise of stock options
Issuance of common stock upon cashless exercise of stock options (in shares)	13,900
Stock subscribed but not issued		(8)	8
Net loss				(2,665)	(2,665)
Balance at ending at Mar. 31, 2018	$ 17	81,792	8	(76,262)	5,555
Balance at ending (in shares) at Mar. 31, 2018	16,512,246
Balance at beginning at Dec. 31, 2018	$ 24	92,128		(85,838)	6,314
Balance at beginning (in shares) at Dec. 31, 2018	23,471,999
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock for services		32			32
Issuance of common stock for services (in shares)	38,580
Stock-based compensation		252			252
Issuance of common stock upon exercise of warrants		36			36
Issuance of common stock upon exercise of warrants (in shares)	31,811
Issuance of common stock upon cashles exercise of stock options
Issuance of common stock upon cashless exercise of stock options (in shares)	18,474				18,474
Net loss				(2,364)	$ (2,364)
Balance at ending at Mar. 31, 2019	$ 24	$ 92,448		$ (88,202)	$ 4,270
Balance at ending (in shares) at Mar. 31, 2019	23,560,864