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
Issuance of common stock, net of fees		1,180		1,180
Issuance of common stock, net of fees (in shares)	113
Stock-based compensation		554		554
Net loss			(8,583)	(8,583)
Ending Balance at Dec. 31, 2018	$ 1	48,957	(47,740)	1,218
Ending Balance (in shares) at Dec. 31, 2018	680
Issuance of common stock, net of fees	$ 3	26,697		26,700
Issuance of common stock, net of fees (in shares)	2,602
Exercise of warrants, net of fees		1,083		1,083
Exercise of warrants, net of fees (in shares)	410
Stock-based compensation		684		684
Net loss			(8,599)	(8,599)
Ending Balance at Dec. 31, 2019	$ 4	$ 77,421	$ (56,339)	$ 21,086
Ending Balance (in shares) at Dec. 31, 2019	3,692