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Domestic and Foreign Revenues - Significant Foreign Revenues from Operations (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Entity Wide Revenue Major Customer [Line Items]
Revenues from operations	$ 7,501	$ 8,071	$ 20,919	$ 23,748
Malaysia [Member]
Entity Wide Revenue Major Customer [Line Items]
Revenues from operations	832	722	1,874	2,303
Hong Kong [Member]
Entity Wide Revenue Major Customer [Line Items]
Revenues from operations	140	213	495	824
Germany [Member]
Entity Wide Revenue Major Customer [Line Items]
Revenues from operations	127	52	413	345
Australia [Member]
Entity Wide Revenue Major Customer [Line Items]
Revenues from operations	2	162	191	655
All other foreign countries [Member]
Entity Wide Revenue Major Customer [Line Items]
Revenues from operations	402	317	1,275	1,432
Foreign [Member]
Entity Wide Revenue Major Customer [Line Items]
Revenues from operations	1,503	1,466	4,248	5,559
Domestic [Member]
Entity Wide Revenue Major Customer [Line Items]
Revenues from operations	$ 5,998	$ 6,605	$ 16,671	$ 18,189

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