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Debt Obligations - Senior Term Loan (Details)		3 Months Ended
	Dec. 07, 2018 USD ($)	Mar. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)
Senior Term Loan
Debt Instrument [Line Items]
Less: net unamortized debt discount	$ 2,100,000	$ 1,020,000	$ 1,200,000
Debt issuance costs	$ 2,000,000	989,000	$ 1,163,000
Term	36 months
Interest rate, stated percentage	4.75%
Minimum cash balance required		$ 5,000,000.0
Expected future net cash flows from refined coal business		1.75
Maximum annual collective dividends and buybacks		$ 30,000,000.0
Minimum requirement from future net cash flows from refined coal business		$ 100,000,000
Senior Term Loan | Beginning on March 1, 2019
Debt Instrument [Line Items]
Periodic payment, principal	$ 6,000,000
Senior Term Loan | LIBOR
Debt Instrument [Line Items]
Basis spread on variable rate	1.50%
ADA Carbon Solutions, LLC | Term Loan | Senior Term Loan
Debt Instrument [Line Items]
Proceeds from issuance of debt	$ 70,000,000
Senior Term Loan due December 2021, related party | Minimum
Debt Instrument [Line Items]
Percent of common stock owned	5.00%

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