Other Financial Information - Change in the inventory reserve (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Change in Accounting Estimate [Line Items]
Beginning balance	$ 23	$ 11
Provisions (benefits)	235	12
Recoveries (write-offs), net	(235)	0
Ending balance	23	23
Inventory reserve [Member]
Change in Accounting Estimate [Line Items]
Beginning balance	29	16
Provisions (benefits)	555	112
Recoveries (write-offs), net	(114)	(99)
Ending balance	$ 470	$ 29