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Business Segment Information - Segment Operating Results (Details)
 3 Months Ended 6 Months Ended 9 Months Ended
Sep. 30, 2021
USD ($)
Sep. 30, 2020
USD ($)
Jun. 30, 2020
USD ($)
Sep. 30, 2021
USD ($)
segment
Sep. 30, 2020
USD ($)
Segment Reporting Information [Line Items]          
Number of reportable segments | segment       2  
Revenues:          
Earnings in equity method investments $ 22,195,000 $ 9,518,000   $ 61,944,000 $ 25,959,000
Total revenues 28,854,000 19,471,000   69,584,000 43,217,000
Total reported revenues 28,854,000 19,471,000   69,584,000 43,217,000
Segment operating income (loss):          
Total segment operating income (loss) 3,299,000 (2,825,000)   4,068,000 (42,531,000)
Upfront customer consideration 100,000 0   400,000 0
Gain on change in estimate, asset retirement obligation 0 0   1,942,000 0
Refined Coal          
Revenues:          
Earnings in equity method investments 22,195,000 9,518,000   61,944,000 25,959,000
Total revenues 4,165,000 3,627,000   11,888,000 9,986,000
Advanced Purification Technologies          
Revenues:          
Earnings in equity method investments 0 0   0 0
Total revenues 24,689,000 15,844,000   57,696,000 33,231,000
Segment operating income (loss):          
Impairment expense on mine and plant long-lived assets     $ 18,986,000    
Gain on change in estimate, asset retirement obligation       1,900,000  
Consumables          
Revenues:          
Total revenues 24,689,000 15,844,000   57,696,000 33,231,000
Consumables | Refined Coal          
Revenues:          
Total revenues 0 0   0 0
Consumables | Advanced Purification Technologies          
Revenues:          
Total revenues 24,689,000 15,844,000   57,696,000 33,231,000
Operating Segments          
Revenues:          
Total reported revenues 51,049,000 28,989,000   131,528,000 69,176,000
Segment operating income (loss):          
Total segment operating income (loss) 30,932,000 9,537,000   78,381,000 (6,195,000)
Operating Segments | Refined Coal          
Revenues:          
Earnings in equity method investments 22,195,000 9,518,000   61,944,000 25,959,000
License royalties, related party 4,165,000 3,627,000   11,888,000 9,986,000
Total reported revenues 26,360,000 13,145,000   73,832,000 35,945,000
Segment operating income (loss):          
Total segment operating income (loss) 26,341,000 12,817,000   73,517,000 34,454,000
Operating Segments | Advanced Purification Technologies          
Revenues:          
Total reported revenues 24,689,000 15,844,000   57,696,000 33,231,000
Segment operating income (loss):          
Total segment operating income (loss) 4,591,000 (3,280,000)   4,864,000 (40,649,000)
Impairment expense on mine and plant long-lived assets 2,000,000 1,600,000   5,700,000 5,400,000
Operating Segments | Consumables | Advanced Purification Technologies          
Revenues:          
Total revenues 24,689,000 15,844,000   57,696,000 33,231,000
Intersegment Eliminations | Refined Coal          
Revenues:          
Earnings in equity method investments $ (22,195,000) $ (9,518,000)   $ (61,944,000) $ (25,959,000)