Basis of Presentation and Summary of Significant Accounting Policies - Basis of presentation (Details) $ / shares in Units, $ in Thousands			3 Months Ended						9 Months Ended		12 Months Ended
	Jun. 16, 2023	Jun. 15, 2023	Sep. 30, 2023 USD ($) $ / shares	Jun. 30, 2023 USD ($)	Mar. 31, 2023 USD ($)	Sep. 30, 2022 USD ($)	Jun. 30, 2022 USD ($)	Mar. 31, 2022 USD ($)	Sep. 30, 2023 USD ($) $ / shares	Sep. 30, 2022 USD ($)	Dec. 31, 2022 USD ($)	Nov. 16, 2022 USD ($)	Aug. 23, 2022 d $ / shares	Dec. 31, 2021 USD ($)
Accounting Policies [Abstract]
Net Income (Loss)			$ (944)	$ (1,167)	$ (1,333)	$ (2,662)	$ (2,486)	$ (2,821)	$ (3,444)	$ (7,969)	$ (10,300)
Cash used in operating activities			$ (1,035)			(891)			$ (2,370)	(6,241)	(6,700)
Common stock, minimum bid price (USD per share) | $ / shares			$ 1.00						$ 1.00
Common stock, closing bid price (USD per share) | $ / shares													$ 1.00
Number of consecutive days for bid | d													30
Stockholders' equity			$ 3,892	$ 3,099	$ 2,955	$ 1,526	$ 4,171	$ 3,432	$ 3,892	$ 1,526	$ (477)	$ 2,500		$ 6,209
Reverse stock split ratio	0.142857	0.142857