Domestic and Foreign Revenues - Significant Foreign Revenues from Operations (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Entity Wide Revenue Major Customer [Line Items]
Revenues from operations	$ 24,870	$ 22,402
Malaysia [Member]
Entity Wide Revenue Major Customer [Line Items]
Revenues from operations	3,153	3,038
All other foreign countries [Member]
Entity Wide Revenue Major Customer [Line Items]
Revenues from operations	3,044	3,275
Foreign [Member]
Entity Wide Revenue Major Customer [Line Items]
Revenues from operations	6,197	6,313
Domestic [Member]
Entity Wide Revenue Major Customer [Line Items]
Revenues from operations	$ 18,673	$ 16,089