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, 2019	$ 4	$ 77,421	$ (56,339)	$ 21,086
Beginning Balance (in shares) at Dec. 31, 2019	3,692
Stock-based compensation		432		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		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
Beginning Balance at Dec. 31, 2020	$ 5	82,286	(67,221)	15,070
Beginning Balance (in shares) at Dec. 31, 2020	4,542
Issuance of common stock, net of fees	$ 2	15,850		15,852
Issuance of common stock, net of fees (in shares)	2,189
Exercise of warrants, net of fees		4,157		4,157
Exercise of warrants, net of fees (in shares)	429
Stock-based compensation		591		591
Net loss			(6,324)	(6,324)
Ending Balance at Sep. 30, 2021	$ 7	102,884	(73,545)	29,346
Ending Balance (in shares) at Sep. 30, 2021	7,160
Beginning Balance at Jun. 30, 2021	$ 7	101,223	(71,476)	29,754
Beginning Balance (in shares) at Jun. 30, 2021	6,960
Issuance of common stock, net of fees		1,399		1,399
Issuance of common stock, net of fees (in shares)	200
Stock-based compensation		262		262
Net loss			(2,069)	(2,069)
Ending Balance at Sep. 30, 2021	$ 7	$ 102,884	$ (73,545)	$ 29,346
Ending Balance (in shares) at Sep. 30, 2021	7,160