CONDENSED CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY - USD ($) shares in Thousands, $ in Thousands	Total	Common Stock	Additional Paid-in Capital	Accumulated Deficit
Beginning Balance at Dec. 31, 2017	$ 8,067	$ 1	$ 47,223	$ (39,157)
Beginning Balance (in shares) at Dec. 31, 2017		567
Stock-based compensation	124		124
Net loss	(1,916)			(1,916)
Ending Balance at Mar. 31, 2018	6,275	$ 1	47,347	(41,073)
Ending Balance (in shares) at Mar. 31, 2018		567
Beginning Balance at Dec. 31, 2018	1,218	$ 1	48,957	(47,740)
Beginning Balance (in shares) at Dec. 31, 2018		680
Issuance of common stock, net of fees	19,411	$ 2	19,409
Issuance of common stock, net of fees (in shares)		1,794
Exercise of warrants, net of fees	869	$ 0	869
Exercise of warrants, net of fees (in shares)		340
Stock-based compensation	157		157
Net loss	(1,512)			(1,512)
Ending Balance at Mar. 31, 2019	$ 20,143	$ 3	$ 69,392	$ (49,252)
Ending Balance (in shares) at Mar. 31, 2019		2,814