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Business Segment Information
 9 Months Ended
Sep. 30, 2021
Segment Reporting [Abstract]  
Business Segment Information Business Segment InformationOperating segments are defined as components of an enterprise about which separate financial information is available that is evaluated regularly by a company's chief operating decision maker ("CODM"), or a decision-making group, to allocate
resources and assess financial performance. As of September 30, 2021, the Company's CODM was the Company's CEO. The Company's operating and reportable segments are identified by products and services provided.
As of September 30, 2021, the Company has two reportable segments: (1) Refined Coal ("RC"); and (2) Advanced Purification Technologies ("APT"). Effective December 31, 2020, and as reported in the 2020 Form 10-K, the Company revised its segments to RC and APT, and amounts for the three and nine months ended September 30, 2020 have been recast to conform with the current year presentation. Both Tinuum Group and Tinuum Services are significantly winding down their operations due to the expected expiration of the Section 45 tax credit period as of December 31, 2021. As such, the Company's earnings and distributions from our RC segment will substantially cease as of December 31, 2021.
The business segment measurements provided to and evaluated by the CODM are computed in accordance with the principles listed below:
•The accounting policies of the operating segments are the same as those described in the summary of significant accounting policies in the 2020 Form 10-K.
•Segment revenues include equity method earnings and losses from the Company's equity method investments.
•Segment operating income (loss) includes segment revenues and allocation of certain "Corporate general and administrative expenses," which include Payroll and benefits, General and administrative and Depreciation, amortization, depletion and accretion.
•RC segment operating income includes interest expense directly attributable to the RC segment.
As of September 30, 2021 and December 31, 2020, substantially all of the Company's material assets are located in the U.S. and substantially all significant customers are U.S. companies. The following table presents the Company's operating segment results for the three and nine months ended September 30, 2021 and 2020:
 Three Months Ended September 30,Nine Months Ended September 30,
(in thousands)2021202020212020
Revenues:
Refined Coal:
Earnings in equity method investments$22,195 $9,518 $61,944 $25,959 
License royalties, related party4,165 3,627 11,888 9,986 
26,360 13,145 73,832 35,945 
Advanced Purification Technologies:
Consumables24,689 15,844 57,696 33,231 
24,689 15,844 57,696 33,231 
Total segment reporting revenues51,049 28,989 131,528 69,176 
Adjustments to reconcile to reported revenues:
Earnings in equity method investments(22,195)(9,518)(61,944)(25,959)
Total reported revenues$28,854 $19,471 $69,584 $43,217 
Segment operating income (loss):
Refined Coal$26,341 $12,817 $73,517 $34,454 
Advanced Purification Technologies (1) (2)4,591 (3,280)4,864 (40,649)
Total segment operating income (loss)$30,932 $9,537 $78,381 $(6,195)
(1) Included in APT segment operating income (loss) for the three and nine months ended September 30, 2021 and 2020 is $2.0 million and $5.7 million, $1.6 million and $5.4 million, respectively, of depreciation, amortization, depletion and accretion expense on mine and Red River Plant long-lived assets and liabilities and $0.1 million, $0.4 million, zero and zero, respectively, of amortization of Upfront Customer Consideration.
(2) Included in APT segment operating income for the nine months ended September 30, 2021 is $1.9 million gain related to the change in the Marshall Mine ARO as of September 30, 2021.
A reconciliation of reportable segment operating income to consolidated income (loss) before income tax expense is as follows:
 Three Months Ended September 30,Nine Months Ended September 30,
(in thousands)2021202020212020
Total reported segment operating income (loss)$30,932 $9,537 $78,381 $(6,195)
Adjustments to reconcile to income (loss) before income (loss) tax expense attributable to the Company:
Corporate payroll and benefits(690)(587)(2,155)(2,444)
Corporate legal and professional fees(1,024)(1,176)(4,154)(3,850)
Corporate general and administrative(1,011)(1,116)(3,236)(4,273)
Corporate depreciation and amortization(132)(148)(408)(337)
Corporate interest income (expense), net54 (680)(944)(2,446)
Other income, net705 (1)1,109 128 
Income (loss) before income tax expense$28,834 $5,829 $68,593 $(19,417)
Corporate general and administrative expenses include certain costs that benefit the business as a whole but are not directly related to one of the Company's segments. Such costs include, but are not limited to, accounting and human resources staff, information systems costs, legal fees, facility costs, audit fees and corporate governance expenses. 
A reconciliation of reportable segment assets to consolidated assets is as follows:
As of
(in thousands)September 30,
2021		December 31,
2020
Assets:
Refined Coal (1)$7,182 $11,516 
Advanced Purification Technologies (2)83,862 80,877 
Total segment assets91,044 92,393 
All Other and Corporate (3)90,729 54,278 
Consolidated$181,773 $146,671 
(1) Includes $2.9 million and $7.7 million of investments in equity method investees as of September 30, 2021 and December 31, 2020, respectively.
(2) Includes $37.0 million and $34.6 million of long-lived assets, net.
(3) Includes the Company's deferred tax assets of $1.6 million and $10.6 million as of September 30, 2021 and December 31, 2020, respectively. Also includes Cash, cash equivalents and restricted cash of $82.1 million and $17.2 million as of September 30, 2021 and December 31, 2020.