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Business Segment Information - Segment Assets (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Dec. 31, 2019
Segment Reporting Information [Line Items]
Assets	$ 181,773	$ 146,671
Equity method investments	2,884	7,692
Deferred tax assets, net	1,558	10,604	$ 1,600
Cash, cash equivalents and restricted cash	82,139	35,932	$ 25,029		$ 17,080
Advanced Purification Technologies
Segment Reporting Information [Line Items]
Assets				$ 58,300
Operating Segments
Segment Reporting Information [Line Items]
Assets	91,044	92,393
Operating Segments | Refined Coal
Segment Reporting Information [Line Items]
Assets	7,182	11,516
Operating Segments | Advanced Purification Technologies
Segment Reporting Information [Line Items]
Assets	83,862	80,877
Long-lived assets	37,000	34,600
All Other and Corporate
Segment Reporting Information [Line Items]
Assets	90,729	54,278
Cash, cash equivalents and restricted cash	$ 82,100	$ 17,200

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Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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