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

Revenue, Excluding Portion from Other Segments

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Amount of income (loss) for proportionate share of equity method investee's income (loss).

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Amount, including tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value-added and excise.

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Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

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