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Business Segment, Geographic and Major Customer Information - Assets by Reportable Segments (Details) - USD ($) | Mar. 31, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019
--- | --- | --- | --- | --- | ---
Segment Reporting Information [Line Items] |  |  |  |  |
Total assets | $ 136,774,000 | $ 230,600,000 | $ 247,868,000 | $ 262,260 | $ 281,051
Operating Segments | Energy Chemistry Technologies |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Total assets | 45,883,000 | 116,110,000 |  |  |
Corporate and Other |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Total assets | 90,891,000 | 114,490,000 |  |  |
Total assets |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Total assets | $ 136,774,000 | $ 230,600,000 |  |  |

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