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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)

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