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Business Segment Information - Segment Assets (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Segment Reporting Information [Line Items]    
Assets $ 107,296 $ 60,775
Operating Segments | Refined Coal    
Segment Reporting Information [Line Items]    
Assets 6,310 19,507
Operating Segments | Emissions Control    
Segment Reporting Information [Line Items]    
Assets 24,551 31,467
All Other and Corporate    
Segment Reporting Information [Line Items]    
Assets $ 76,435 $ 9,801