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Revenues - Disaggregation of Revenue (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Disaggregation of Revenue [Line Items]    
Revenue component $ 12,263 $ 19,329
Earnings from equity method investments 8,273 21,690
Total revenues from customers and earnings from equity method investments 12,263 19,329
Total revenues from customers and earnings from equity method investments 20,536 41,019
Operating Segments    
Disaggregation of Revenue [Line Items]    
Total revenues from customers and earnings from equity method investments 19,794 40,463
Consumables    
Disaggregation of Revenue [Line Items]    
Revenue component 9,217 15,109
License royalties, related party    
Disaggregation of Revenue [Line Items]    
Revenue component 3,046 4,220
Power Generation and Industrials    
Disaggregation of Revenue [Line Items]    
Revenue component 8,475 14,553
Earnings from equity method investments 0 0
Power Generation and Industrials | Operating Segments    
Disaggregation of Revenue [Line Items]    
Total revenues from customers and earnings from equity method investments 8,475 14,553
Power Generation and Industrials | Consumables    
Disaggregation of Revenue [Line Items]    
Revenue component 8,475 14,553
Power Generation and Industrials | Consumables | Operating Segments    
Disaggregation of Revenue [Line Items]    
Revenue component 8,475 14,553
Power Generation and Industrials | License royalties, related party    
Disaggregation of Revenue [Line Items]    
Revenue component 0 0
Refined Coal    
Disaggregation of Revenue [Line Items]    
Revenue component 3,046 4,220
Earnings from equity method investments 8,273 21,690
Refined Coal | Operating Segments    
Disaggregation of Revenue [Line Items]    
Earnings from equity method investments 8,273 21,690
Total revenues from customers and earnings from equity method investments 11,319 25,910
Refined Coal | Consumables    
Disaggregation of Revenue [Line Items]    
Revenue component 0 0
Refined Coal | License royalties, related party    
Disaggregation of Revenue [Line Items]    
Revenue component 3,046 4,220
Other    
Disaggregation of Revenue [Line Items]    
Revenue component 742 556
Earnings from equity method investments 0 0
Other | Operating Segments    
Disaggregation of Revenue [Line Items]    
Total revenues from customers and earnings from equity method investments 742 556
Other | Consumables    
Disaggregation of Revenue [Line Items]    
Revenue component 742 556
Other | License royalties, related party    
Disaggregation of Revenue [Line Items]    
Revenue component $ 0 $ 0