CONDENSED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-in Capital	Accumulated Deficit
Beginning balance (in shares) at Dec. 31, 2021		18,660,369
Beginning balance at Dec. 31, 2021	$ 19,577	$ 19	$ 146,455	$ (126,897)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation	829		829
Issuance of shares for vested restricted stock grants (in shares)		14,611
Net loss	(1,468)			(1,468)
Ending balance (in shares) at Mar. 31, 2022		18,674,980
Ending balance at Mar. 31, 2022	18,938	$ 19	147,284	(128,365)
Beginning balance (in shares) at Dec. 31, 2022		18,957,366
Beginning balance at Dec. 31, 2022	18,504	$ 19	149,233	(130,748)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation	642		642
Issuance of common stock for vested restricted stock units and earned performance stock units (in shares)		258,497
Net loss	(1,316)			(1,316)
Ending balance (in shares) at Mar. 31, 2023		19,215,863
Ending balance at Mar. 31, 2023	$ 17,830	$ 19	$ 149,875	$ (132,064)