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, 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
Beginning Balance at Dec. 31, 2019	$ 4	77,421	(56,339)	21,086
Beginning Balance (in shares) at Dec. 31, 2019	3,692
Stock-based compensation	$ 0	289	0	289
Net loss			(5,364)	(5,364)
Ending Balance at Jun. 30, 2020	$ 4	77,710	(61,703)	16,011
Ending Balance (in shares) at Jun. 30, 2020	3,692
Beginning Balance at Mar. 31, 2020	$ 4	77,591	(59,663)	17,932
Beginning Balance (in shares) at Mar. 31, 2020	3,692
Stock-based compensation	$ 0	119		119
Net loss			(2,040)	(2,040)
Ending Balance at Jun. 30, 2020	$ 4	$ 77,710	$ (61,703)	$ 16,011
Ending Balance (in shares) at Jun. 30, 2020	3,692