Revenue, Contract Liabilities (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Dec. 31, 2021	Dec. 31, 2020
Contract liabilities [Abstract]
Total contract liabilities	$ 361	$ 187	$ 341	$ 69
Less: current portion	(58)	(32)	(48)
Non-current contract liabilities	303	155	293
Revenue related to contract liabilities	(8)	(8)
Service Agreements [Member]
Contract liabilities [Abstract]
Total contract liabilities	361		137
Deposit on Future Equipment Purchases [Member]
Contract liabilities [Abstract]
Total contract liabilities	0	125	$ 204
New Service Agreement Additions [Member]
Contract liabilities [Abstract]
Total contract liabilities	$ 28	$ 1