Domestic and Foreign Revenues - Significant Foreign Revenues from Operations (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Entity Wide Revenue Major Customer [Line Items]
Revenues from operations	$ 28,140	$ 31,162
Malaysia [Member]
Entity Wide Revenue Major Customer [Line Items]
Revenues from operations	2,745	2,842
Hong Kong [Member]
Entity Wide Revenue Major Customer [Line Items]
Revenues from operations	682	1,211
Australia [Member]
Entity Wide Revenue Major Customer [Line Items]
Revenues from operations	193	974
All other foreign countries [Member]
Entity Wide Revenue Major Customer [Line Items]
Revenues from operations	2,424	2,383
Foreign [Member]
Entity Wide Revenue Major Customer [Line Items]
Revenues from operations	6,044	7,410
Domestic [Member]
Entity Wide Revenue Major Customer [Line Items]
Revenues from operations	$ 22,096	$ 23,752