Basis of Presentation and Summary of Significant Accounting Policies - Basis of presentation (Details) $ / shares in Units, $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2023 USD ($) $ / shares	Mar. 31, 2022 USD ($)	Dec. 31, 2022 USD ($)	Nov. 16, 2022 USD ($)	Sep. 30, 2022 USD ($)	Aug. 23, 2022 d $ / shares	Dec. 31, 2021 USD ($)
Accounting Policies [Abstract]
Net loss | $	$ (1,333)	$ (2,821)	$ (10,300)
Cash used in operating activities | $	$ (1,183)	(2,703)	(6,700)
Common stock, minimum bid price (USD per share) | $ / shares	$ 1.00
Common stock, trade price (USD per share) | $ / shares	$ 1.00
Common stock, closing bid price (USD per share) | $ / shares						$ 1.00
Number of consecutive days for bid | d						30
Stockholders' equity | $	$ 2,955	$ 3,432	$ (477)	$ 2,500	$ 1,500		$ 6,209