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Business Segment Information - Segment Operating Results (Details)
$ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2016
USD ($)
Sep. 30, 2016
USD ($)
Jun. 30, 2016
USD ($)
Mar. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Sep. 30, 2015
USD ($)
Jun. 30, 2015
USD ($)
Mar. 31, 2015
USD ($)
Dec. 31, 2016
USD ($)
segment
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Segment Reporting Information [Line Items]                      
Number of reportable segments | segment                 2    
Revenues:                      
Earnings from equity method investments $ 15,518 $ 10,735 $ 13,754 $ 5,577 $ 3,788 $ (41) $ 4,860 $ 314 $ 45,584 $ 8,921 $ 42,712
Equipment sales                 46,949 60,099 12,044
Consulting services                 648 1,752 4,488
Royalties, related party 2,203 2,064 669 1,189 2,876 3,273 2,299 2,194 6,125 10,642 6,410
Chemicals                 3,025 888 391
Total reported revenues 3,604 15,710 8,951 22,357 13,202 12,885 14,895 21,757 50,622 62,739 16,923
Segment reporting operating income (loss)                      
Segment reporting operating income (loss) $ (5,262) $ (2,913) $ (4,612) $ (3,311) $ (7,135) $ (9,989) $ (17,778) $ (6,898) (16,098) (41,800) (41,814)
Gain on sale of equity method investment                 2,078 0 0
453A interest                 2,490 4,639 3,371
Interest on RCM6 note payable, related party                 263 2,468 2,245
Gain on contract termination                 891 0 0
Operating Segments                      
Revenues:                      
Total reported revenues                 102,331 82,302 66,045
Segment reporting operating income (loss)                      
Segment reporting operating income (loss)                 58,598 4,548 28,746
Refined Coal | Operating Segments                      
Revenues:                      
Earnings from equity method investments                 45,584 8,921 42,712
Consulting services                 0 55 665
Royalties, related party                 6,125 10,642 6,410
Total reported revenues                 51,709 19,618 49,787
Segment reporting operating income (loss)                      
Segment reporting operating income (loss)                 51,264 12,131 42,094
Refined Coal | Intersegment Eliminations                      
Revenues:                      
Earnings from equity method investments                 (45,584) (8,921) (42,712)
Royalties, related party                 (6,125) (10,642) (6,410)
Total reported revenues                 (51,709) (19,563) (49,122)
Emissions Control | Operating Segments                      
Revenues:                      
Equipment sales                 46,949 60,099 12,044
Consulting services                 648 1,697 3,823
Chemicals                 3,025 888 391
Total reported revenues                 50,622 62,684 16,258
Segment reporting operating income (loss)                      
Segment reporting operating income (loss)                 7,334 $ (7,583) $ (13,348)
Gain on contract termination                 $ 900