Accrued Liabilities (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023	Mar. 31, 2023	Dec. 31, 2022
Components of accrued liabilities
Accrued compensation and related charges	$ 2,941	$ 3,707
Preferred stock dividends payable	2,901	2,901
Payable in connection with construction in progress	1,613	7,249
Other tax payable	652	493
Advances from customers	535	305
Accrued product warranty	495	703	$ 915	$ 669
Accrued professional services	471	868
Current portion of operating lease liabilities	463	458
Other personnel-related costs	276	286
Accrued income taxes	272
Accrual for sales returns	34	39
Other accrued liabilities	2,044	2,010
Accrued liabilities, Total	$ 12,697	$ 19,019