Business Segment, Geographic and Major Customer Information - Geographic Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Revenues from External Customers and Long-Lived Assets
Total revenues	$ 43,268	$ 53,141
U.S.
Revenues from External Customers and Long-Lived Assets
Total revenues	33,187	40,632
UAE
Revenues from External Customers and Long-Lived Assets
Total revenues	4,512	6,763
Other countries
Revenues from External Customers and Long-Lived Assets
Total revenues	$ 5,569	$ 5,746