Schedule of Accrued Liabilities (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Payables and Accruals [Abstract]
Accrued salaries, bonus, and benefits	$ 1,016	$ 1,516
Accrued licenses and maintenance fees	484	484
Accrued warranties	237	242
Accrued taxes	201	177
Accrued investigational sites	115	123
Accrued lease deposit payable	5	124
Other	111	81
Total accrued liabilities	2,169	2,747
Less: Long term accrued liabilities	(202)	(219)
Total current accrued liabilities	$ 1,967	$ 2,528