CONDENSED STATEMENTS OF CHANGES IN REDEEMABLE CONVERTIBLE PREFERRED STOCK AND STOCKHOLDERS' EQUITY (Unaudited) - USD ($) $ in Thousands	Total	Series A Redeemable Convertible Preferred Stock	Common Stock	Additional Paid-in Capital	Accumulated Deficit	Accumulated Other Comprehensive Income
Beginning Balance at Dec. 31, 2022	$ 41,984		$ 111	$ 139,381	$ (97,508)
Beginning Balance, Shares at Dec. 31, 2022			11,093,000
Stock-based compensation under the Incentive Plans and 2020 Plan	1,726			1,726
Issuance of common stock under the Incentive Plans and 2020 Plan, net of forfeitures, Shares			15,000
Restricted stock awards cancelled			(5,000)
Net loss	(4,272)				(4,272)
Ending Balance at Mar. 31, 2023	$ 39,438		$ 111	141,107	(101,780)
Ending Balance, Shares at Mar. 31, 2023			11,103,000
Beginning Balance, Shares at Dec. 31, 2023	20,000	20,000
Beginning Balance at Dec. 31, 2023	$ 33,429	$ 13,747	$ 113	145,203	(111,891)	$ 4
Beginning Balance, Shares at Dec. 31, 2023			11,327,000
Exercise of stock options under the Incentive Plans	5			5
Exercise of stock options under the Incentive Plans, Shares			2,000
Stock-based compensation under the Incentive Plans and 2020 Plan	652			652
Issuance of common stock under the Incentive Plans and 2020 Plan, net of forfeitures	(89)		$ 1	(90)
Issuance of common stock under the Incentive Plans and 2020 Plan, net of forfeitures, Shares			66,000
Net loss	(2,157)				(2,157)
Change in unrealized gain (loss) on investments	$ (5)					(5)
Ending Balance, Shares at Mar. 31, 2024	20,000	20,000
Ending Balance at Mar. 31, 2024	$ 31,835	$ 13,747	$ 114	$ 145,770	$ (114,048)	$ (1)
Ending Balance, Shares at Mar. 31, 2024			11,395,000