Accrued Expense (Details) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Accrued expense	$ 973	$ 909
Accrued Expenses
Accrued expense	1,000	900
Vacation and bonus expenses	500	400
Manufacturing and testing services	200
Professional and consulting fees	100	100
Legal and patent fees	100	100
Other expenses	$ 100	100
Manufacturing expenses		$ 200