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Discontinued Operations (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017 | Dec. 31, 2017
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Assets held for sale | $ 485 |  | $ 485 |  | $ 485
Accrued severance charges |  |  |  |  | $ 376
Loss from discontinued operations | (74) | $ (1,269) | (99) | $ (1,999) |
Fuel Conversion Segment |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Expected severance costs | 581 |  | 581 |  |
Fuel Conversion Segment | Period Two |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Cost remaining | 311 |  | 311 |  |
Fuel Conversion Segment | Period One |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Severance costs | 94 |  | 203 |  |
Fuel Conversion Segment | Period Three |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Cost remaining | 65 |  | 65 |  |
Fuel Conversion Segment | Accrued Liabilities |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Accrued severance charges | 188 |  | $ 188 |  |
Held-for-sale | Patent |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Intangible asset impairment | $ 56 |  |  |  |

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