Other Assets (Details) - USD ($) $ in Thousands |
Dec. 31, 2017 |
Dec. 31, 2016 |
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Other assets | $ 1,839 | $ 1,905 | |||||||
Less: current portion | [1] | (275) | (275) | ||||||
Other assets, non-current | 1,564 | 1,630 | |||||||
Alameda Security Deposit [Member] | |||||||||
Other assets | [1] | 321 | 597 | ||||||
CD For Green Bank Collateral Security [Member] | |||||||||
Other assets | [2] | 1,019 | 1,012 | ||||||
Nevada Sales And Use Tax Deposit [Member] | |||||||||
Other assets | 49 | 49 | |||||||
Facility Closure Trust Deposit [Member] | |||||||||
Other assets | [3] | 450 | 100 | ||||||
Various Other Assets [Member] | |||||||||
Other assets | $ 147 | ||||||||
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