Business Segment, Geographic and Major Customer Information - Geographic Information (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Revenues from External Customers and Long-Lived Assets
Total revenues	$ 12,879	$ 11,770
U.S.
Revenues from External Customers and Long-Lived Assets
Total revenues	10,334	9,661
UAE
Revenues from External Customers and Long-Lived Assets
Total revenues	1,311	1,103
Other countries
Revenues from External Customers and Long-Lived Assets
Total revenues	$ 1,234	$ 1,006