Revenue from Contracts with Customers - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Disaggregation of Revenue
Total revenues	$ 43,268	$ 53,141
Products
Disaggregation of Revenue
Total revenues	40,265	50,478
Services
Disaggregation of Revenue
Total revenues	$ 3,003	$ 2,663