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		1,083		1,083
Exercise of warrants, net of fees (in shares)	410
Stock-based compensation		522		522
Net loss			(6,210)	(6,210)
Ending Balance at Sep. 30, 2019	$ 3	69,971	(53,950)	16,024
Ending Balance (in shares) at Sep. 30, 2019	2,884
Beginning Balance at Jun. 30, 2019	$ 3	69,618	(51,708)	17,913
Beginning Balance (in shares) at Jun. 30, 2019	2,831
Exercise of warrants, net of fees		169		169
Exercise of warrants, net of fees (in shares)	53
Stock-based compensation		184		184
Net loss			(2,242)	(2,242)
Ending Balance at Sep. 30, 2019	$ 3	69,971	(53,950)	16,024
Ending Balance (in shares) at Sep. 30, 2019	2,884
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	432	0	432
Net loss			(8,332)	(8,332)
Ending Balance at Sep. 30, 2020	$ 4	77,853	(64,671)	13,186
Ending Balance (in shares) at Sep. 30, 2020	3,692
Beginning Balance at Jun. 30, 2020	$ 4	77,710	(61,703)	16,011
Beginning Balance (in shares) at Jun. 30, 2020	3,692
Stock-based compensation	$ 0	143		143
Net loss			(2,968)	(2,968)
Ending Balance at Sep. 30, 2020	$ 4	$ 77,853	$ (64,671)	$ 13,186
Ending Balance (in shares) at Sep. 30, 2020	3,692