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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
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