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Business Segment Information - Segment Assets (Details) - USD ($) $ in Thousands | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2013
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Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Assets | $ 65,305 |  |  | $ 93,699 |  |  |  |
Equity method investments | 18,546 |  |  | 19,584 |  |  |  |
Clean Coal Solutions (CCS) |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Equity method investments | 0 | $ 0 | $ 0 | 0 | $ 0 | $ 0 | $ 0 | $ 0
Operating Segments | Refined Coal |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Assets | 21,062 |  |  | 21,322 |  |  |  |
Operating Segments | Emissions Control - Engineering Technology Services |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Assets | 20,233 |  |  | 34,175 |  |  |  |
Operating Segments | Emissions Control - Manufacturing |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Assets | 8,291 |  |  | 11,285 |  |  |  |
Operating Segments | Research and Development |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Assets | 5,225 |  |  | 6,431 |  |  |  |
All Other and Corporate |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Assets | $ 10,494 |  |  | $ 20,486 |  |  |  |

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