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Business Segment Information - Segment Operating Results (Details)
$ in Thousands
 3 Months Ended
Mar. 31, 2020
USD ($)
segment
Mar. 31, 2019
USD ($)
Segment Reporting Information [Line Items]    
Number of reportable segments | segment 2  
Revenues:    
Earnings in equity method investments $ 8,273 $ 21,690
Total revenues 12,263 19,329
Total reported revenues 12,263 19,329
Segment operating income (loss):    
Total segment operating income (8,641) (3,555)
453A interest 132 322
Decrease in inventories 1,572 3,262
Refined Coal    
Revenues:    
Earnings in equity method investments 8,273 21,690
Total revenues 3,046 4,220
Refined Coal | RMC6, LLC (RCM6)    
Segment operating income (loss):    
453A interest 100 300
Power Generation and Industrials    
Revenues:    
Earnings in equity method investments 0 0
Total revenues 8,475 14,553
Consumables    
Revenues:    
Total revenues 9,217 15,109
Consumables | Refined Coal    
Revenues:    
Total revenues 0 0
Consumables | Power Generation and Industrials    
Revenues:    
Total revenues 8,475 14,553
Operating Segments    
Revenues:    
Total reported revenues 19,794 40,463
Segment operating income (loss):    
Total segment operating income 4,283 21,771
Operating Segments | Refined Coal    
Revenues:    
Earnings in equity method investments 8,273 21,690
License royalties, related party 3,046 4,220
Total reported revenues 11,319 25,910
Segment operating income (loss):    
Total segment operating income 10,860 25,233
Operating Segments | Power Generation and Industrials    
Revenues:    
Total reported revenues 8,475 14,553
Segment operating income (loss):    
Total segment operating income (6,577) (3,462)
Severance costs 2,000 2,000
Decrease in inventories 3,400  
Operating Segments | Consumables | Power Generation and Industrials    
Revenues:    
Total revenues 8,475 14,553
Intersegment Eliminations | Refined Coal    
Revenues:    
Earnings in equity method investments (8,273) (21,690)
Corporate and Other    
Revenues:    
Total reported revenues 742 556
Segment operating income (loss):    
Total segment operating income $ (793) $ (398)