CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY (DEFICIT) - USD ($) shares in Thousands, $ in Thousands	Common Stock [Member]	Treasury Stock, Common [Member]	AOCI Attributable to Parent [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Total
Beginning balance, value at Dec. 31, 2021	$ 10	$ (362)	$ (43)	$ 84,411	$ (80,097)	$ 3,919
Beginning Balance, shares at Dec. 31, 2021	957	1
Registered direct offering proceeds, net of fees	$ 1			4,295		4,296
Registered direct offering proceeds, net of fees, shares	61
Restricted stock awards
Restricted stock awards, shares	5
Public stock offering, net of fees				1,985		1,985
Public stock offering, net of fees, shares	27
Issuance of common stock to terminate operating lease				200		200
Issuance of common stock to terminate operating lease, shares	4
Nonregistered private placement				100		100
Nonregistered private placement, shares	1
Stock-based compensation expense				1,456		1,456
Exercise of stock options				67		67
Exercise of stock options, shares	5
Tax withholdings related to stock-based compensation awards				(9)		(9)
Net loss					(16,229)	(16,229)
Ending balance, value at Dec. 31, 2022	$ 11	$ (362)	(43)	92,505	(96,326)	(4,215)
Ending Balance, shares at Dec. 31, 2022	1,060	1
Restricted stock awards
Restricted stock awards, shares	11
Withholdings related to stock-based compensation awards				(5)		(5)
Private offering proceeds, net of fees	2			2,344		2,346
Public stock offering, net of fees	$ 4			4,674		4,678
Public stock offering, net of fees, shares	405
Stock-based compensation expense				972		972
Exercise of stock options				8		8
Exercise of stock options, shares	3
Net loss					(13,891)	(13,891)
Private offering proceeds, net of fees, shares	218
Issuance of common stock to reduce notes payable	$ 1			549		550
Issuance of common stock to reduce notes payable, shares	93
Purchase of common stock through employee stock purchase plan				2		2
Purchase of common stock through employee stock purchase plan, shares	1
Ending balance, value at Dec. 31, 2023	$ 18	$ (362)	$ (43)	$ 101,049	$ (110,217)	$ (9,555)
Ending Balance, shares at Dec. 31, 2023	1,791	1