Liquidity (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Accounting Policies [Abstract]
Total cash and cash equivalents	$ 5,990	$ 3,085	$ 9,000
Short-term certificates of deposit	500
Working capital	5,498
Net loss	4,384	21,941
Net cash used in operating activities	2,993	5,934
Sale of property and equipment	0	19
Proceeds from private placement, net of issuance costs	5,364	0
Net proceeds from exercise of common stock warrants	$ 534	$ 0