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Domestic and Foreign Revenues - Significant Foreign Revenues from Operations (Details) - USD ($) $ in Thousands | 12 Months Ended
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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

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