CONDENSED CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY - USD ($) shares in Thousands, $ in Thousands	Common Stock	Additional Paid-in Capital	Accumulated Deficit	Total
Beginning Balance at Dec. 31, 2017	$ 1	$ 47,223	$ (39,157)	$ 8,067
Beginning Balance (in shares) at Dec. 31, 2017	567
Stock-based compensation		263		263
Net loss			(3,593)	(3,593)
Ending Balance at Jun. 30, 2018	$ 1	47,486	(42,750)	4,737
Ending Balance (in shares) at Jun. 30, 2018	567
Beginning Balance at Mar. 31, 2018	$ 1	47,347	(41,073)	6,275
Beginning Balance (in shares) at Mar. 31, 2018	567
Stock-based compensation		139		139
Net loss			(1,677)	(1,677)
Ending Balance at Jun. 30, 2018	$ 1	47,486	(42,750)	4,737
Ending Balance (in shares) at Jun. 30, 2018	567
Beginning Balance at Dec. 31, 2018	$ 1	48,957	(47,740)	1,218
Beginning Balance (in shares) at Dec. 31, 2018	680
Issuance of common stock, net of fees	$ 2	19,409		19,411
Issuance of common stock, net of fees (in shares)	1,794
Exercise of warrants, net of fees		914		914
Exercise of warrants, net of fees (in shares)	357
Stock-based compensation		338		338
Net loss			(3,968)	(3,968)
Ending Balance at Jun. 30, 2019	$ 3	69,618	(51,708)	17,913
Ending Balance (in shares) at Jun. 30, 2019	2,831
Beginning Balance at Mar. 31, 2019	$ 3	69,392	(49,252)	20,143
Beginning Balance (in shares) at Mar. 31, 2019	2,814
Exercise of warrants, net of fees		45		45
Exercise of warrants, net of fees (in shares)	17
Stock-based compensation		181		181
Net loss			(2,456)	(2,456)
Ending Balance at Jun. 30, 2019	$ 3	$ 69,618	$ (51,708)	$ 17,913
Ending Balance (in shares) at Jun. 30, 2019	2,831