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Capital Stock, Stock Plans and Stock Based Compensation - Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
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Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Allocated stock-based compensation | $ 36 | $ 45 | $ 84 | $ 91
Employee Stock Options [Member] |  |  |  |
Allocated stock-based compensation | 36 | 37 | 79 | 73
Director Stock Options [Member] |  |  |  |
Allocated stock-based compensation |  | $ 8 | $ 5 | $ 18

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