Domestic and Foreign Revenues - Significant Foreign Revenues from Operations (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Entity Wide Revenue Major Customer [Line Items]
Revenues from operations	$ 8,618	$ 6,632
Malaysia [Member]
Entity Wide Revenue Major Customer [Line Items]
Revenues from operations	1,018	825
Hong Kong [Member]
Entity Wide Revenue Major Customer [Line Items]
Revenues from operations	246	267
All other foreign countries [Member]
Entity Wide Revenue Major Customer [Line Items]
Revenues from operations	822	617
Foreign [Member]
Entity Wide Revenue Major Customer [Line Items]
Revenues from operations	2,086	1,709
Domestic [Member]
Entity Wide Revenue Major Customer [Line Items]
Revenues from operations	$ 6,532	$ 4,923