Arq (ARQ) 10-Q 15 Aug 22 2022 Q2 Quarterly report Financial data

Cover Page

Cover Page - shares	6 Months Ended
	Jun. 30, 2022	Aug. 10, 2022
Cover [Abstract]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Jun. 30, 2022
Document Transition Report	false
Entity File Number	001-37822
Entity Registrant Name	Advanced Emissions Solutions, Inc.
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	27-5472457
Entity Address, Address Line One	8051 E. Maplewood Ave
Entity Address, Address Line Two	Suite 210
Entity Address, City or Town	Greenwood Village
Entity Address, State or Province	CO
Entity Address, Postal Zip Code	80111
City Area Code	720
Local Phone Number	598-3500
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Non-accelerated Filer
Entity Small Business	true
Entity Emerging Growth Company	false
Entity Shell Company	false
Title of 12(b) Security	Common stock, par value $0.001 per share
Trading Symbol	ADES
Security Exchange Name	NASDAQ
Entity Common Stock, Shares Outstanding		19,130,644
Entity Central Index Key	0001515156
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2022
Document Fiscal Period Focus	Q2
Amendment Flag	false

Condensed Consolidated Balance

Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Current assets:
Cash	$ 80,819	$ 78,753
Receivables, net	12,659	12,622
Receivables, related parties	0	2,481
Inventories, net	12,109	7,850
Prepaid expenses and other current assets	7,441	6,661
Total current assets	113,028	108,367
Restricted cash, long-term	10,000	10,027
Property, plant and equipment, net of accumulated depreciation of $9,428 and $7,684, respectively	31,149	30,171
Other long-term assets, net	29,575	36,871
Total Assets	183,752	185,436
Current liabilities:
Accounts payable and accrued expenses	14,150	16,486
Current portion of finance lease obligations	1,235	1,011
Other current liabilities	5,202	5,124
Total current liabilities	20,587	22,621
Long-term finance lease obligations, net of current portion	3,998	3,152
Other long-term liabilities	14,662	12,362
Total Liabilities	39,247	38,135
Commitments and contingencies (Note 7)
Stockholders’ equity:
Preferred stock: par value of $.001 per share, 50,000,000 shares authorized, none issued	0	0
Common stock: par value of $.001 per share, 100,000,000 shares authorized, 23,693,208 and 23,460,212 shares issued, and 19,075,062 and 18,842,066 shares outstanding at June 30, 2022 and December 31, 2021, respectively	24	23
Treasury stock, at cost: 4,618,146 and 4,618,146 shares as of June 30, 2022 and December 31, 2021, respectively	(47,692)	(47,692)
Additional paid-in capital	102,668	102,106
Retained earnings	89,505	92,864
Total Stockholders’ Equity	144,505	147,301
Total Liabilities and Stockholders’ Equity	$ 183,752	$ 185,436

Condensed Consolidated Balanc_2

Condensed Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Statement of Financial Position [Abstract]
Accumulated depreciation and amortization	$ 9,428	$ 7,684
Preferred stock par value (in dollars per share)	$ 0.001	$ 0.001
Preferred stock, shares authorized (in shares)	50,000,000	50,000,000
Preferred stock, shares issued (in shares)	0	0
Common stock par value (in dollars per share)	$ 0.001	$ 0.001
Common stock, shares authorized (in shares)	100,000,000	100,000,000
Common stock, shares issued (in shares)	23,693,208	23,460,212
Common stock, shares outstanding (in shares)	19,075,062	18,842,066
Treasury stock (in shares)	4,618,146	4,618,146

Condensed Consolidated Statemen

Condensed Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Revenues:
Total revenues	$ 24,739	$ 21,065	$ 51,141	$ 43,672
Operating expenses:
Payroll and benefits	2,519	2,908	5,145	5,377
Legal and professional fees	1,555	1,431	3,727	3,234
General and administrative	1,869	1,593	3,795	3,508
Depreciation, amortization, depletion and accretion	1,588	1,904	3,094	4,010
Loss (gain) on change in estimate, asset retirement obligation	34	(1,942)	34	(1,942)
Total operating expenses	27,475	20,626	57,212	42,903
Operating (loss) income	(2,736)	439	(6,071)	769
Other income (expense):
Earnings from equity method investments	2,389	21,437	3,222	39,749
Interest expense	(90)	(493)	(176)	(1,330)
Other	111	150	(334)	571
Total other income	2,410	21,094	2,712	38,990
(Loss) income before income tax expense	(326)	21,533	(3,359)	39,759
Income tax expense	0	4,943	0	9,432
Net (loss) income	$ (326)	$ 16,590	$ (3,359)	$ 30,327
(Loss) earnings per common share (Note 1):
Basic (in dollars per share)	$ (0.02)	$ 0.91	$ (0.18)	$ 1.66
Diluted (in dollars per share)	$ (0.02)	$ 0.90	$ (0.18)	$ 1.65
Weighted-average number of common shares outstanding:
Basic (in shares)	18,473	18,271	18,409	18,219
Diluted (in shares)	18,473	18,398	18,409	18,356
Consumables
Revenues:
Total revenues	$ 24,739	$ 17,408	$ 51,141	$ 35,949
Operating expenses:
Consumables cost of revenue, exclusive of depreciation and amortization	19,910	14,732	41,417	28,716
License royalties, related party
Revenues:
Total revenues	$ 0	$ 3,657	$ 0	$ 7,723

Condensed Consolidated Statem_2

Condensed Consolidated Statements of Changes in Stockholders' Equity - USD ($) $ in Thousands	Total	Common Stock	Treasury Stock	Additional Paid-in Capital	Retained Earnings
Beginning Balance (in shares) at Dec. 31, 2020		23,141,284
Beginning Balance (in shares) at Dec. 31, 2020			(4,618,146)
Beginning Balance at Dec. 31, 2020	$ 85,210	$ 23	$ (47,692)	$ 100,425	$ 32,454
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation (in shares)		381,339
Stock-based compensation	421			421
Repurchase of common shares to satisfy minimum tax withholdings (in shares)		(40,975)
Repurchase of common shares to satisfy minimum tax withholdings	(216)			(216)
Net income (loss)	13,737				13,737
Ending Balance (in shares) at Mar. 31, 2021		23,481,648
Ending Balance (in shares) at Mar. 31, 2021			(4,618,146)
Ending Balance at Mar. 31, 2021	99,152	$ 23	$ (47,692)	100,630	46,191
Beginning Balance (in shares) at Dec. 31, 2020		23,141,284
Beginning Balance (in shares) at Dec. 31, 2020			(4,618,146)
Beginning Balance at Dec. 31, 2020	85,210	$ 23	$ (47,692)	100,425	32,454
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	30,327
Ending Balance (in shares) at Jun. 30, 2021		23,452,485
Ending Balance (in shares) at Jun. 30, 2021			(4,618,146)
Ending Balance at Jun. 30, 2021	116,283	$ 23	$ (47,692)	101,171	62,781
Beginning Balance (in shares) at Mar. 31, 2021		23,481,648
Beginning Balance (in shares) at Mar. 31, 2021			(4,618,146)
Beginning Balance at Mar. 31, 2021	99,152	$ 23	$ (47,692)	100,630	46,191
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation (in shares)		(25,330)
Stock-based compensation	566			566
Repurchase of common shares to satisfy minimum tax withholdings (in shares)		(3,833)
Repurchase of common shares to satisfy minimum tax withholdings	(25)			(25)
Net income (loss)	16,590				16,590
Ending Balance (in shares) at Jun. 30, 2021		23,452,485
Ending Balance (in shares) at Jun. 30, 2021			(4,618,146)
Ending Balance at Jun. 30, 2021	$ 116,283	$ 23	$ (47,692)	101,171	62,781
Beginning Balance (in shares) at Dec. 31, 2021	18,842,066	23,460,212
Beginning Balance (in shares) at Dec. 31, 2021			(4,618,146)
Beginning Balance at Dec. 31, 2021	$ 147,301	$ 23	$ (47,692)	102,106	92,864
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation (in shares)		323,742
Stock-based compensation	464	$ 1		463
Repurchase of common shares to satisfy minimum tax withholdings (in shares)		(59,736)
Repurchase of common shares to satisfy minimum tax withholdings	(382)			(382)
Net income (loss)	(3,033)				(3,033)
Ending Balance (in shares) at Mar. 31, 2022		23,724,218
Ending Balance (in shares) at Mar. 31, 2022			(4,618,146)
Ending Balance at Mar. 31, 2022	$ 144,350	$ 24	$ (47,692)	102,187	89,831
Beginning Balance (in shares) at Dec. 31, 2021	18,842,066	23,460,212
Beginning Balance (in shares) at Dec. 31, 2021			(4,618,146)
Beginning Balance at Dec. 31, 2021	$ 147,301	$ 23	$ (47,692)	102,106	92,864
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	$ (3,359)
Ending Balance (in shares) at Jun. 30, 2022	19,075,062	23,693,208
Ending Balance (in shares) at Jun. 30, 2022			(4,618,146)
Ending Balance at Jun. 30, 2022	$ 144,505	$ 24	$ (47,692)	102,668	89,505
Beginning Balance (in shares) at Mar. 31, 2022		23,724,218
Beginning Balance (in shares) at Mar. 31, 2022			(4,618,146)
Beginning Balance at Mar. 31, 2022	144,350	$ 24	$ (47,692)	102,187	89,831
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation (in shares)		(30,459)
Stock-based compensation	484			484
Repurchase of common shares to satisfy minimum tax withholdings (in shares)		(551)
Repurchase of common shares to satisfy minimum tax withholdings	(3)			(3)
Net income (loss)	$ (326)				(326)
Ending Balance (in shares) at Jun. 30, 2022	19,075,062	23,693,208
Ending Balance (in shares) at Jun. 30, 2022			(4,618,146)
Ending Balance at Jun. 30, 2022	$ 144,505	$ 24	$ (47,692)	$ 102,668	$ 89,505

Condensed Consolidated Statem_3

Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended				6 Months Ended		12 Months Ended
	Jun. 30, 2022	Mar. 31, 2022	Jun. 30, 2021	Mar. 31, 2021	Jun. 30, 2022	Jun. 30, 2021	Dec. 31, 2021
Cash flows from operating activities
Net (loss) income	$ (326)	$ (3,033)	$ 16,590	$ 13,737	$ (3,359)	$ 30,327
Adjustments to reconcile net (loss) income to net cash provided by operating activities:
Depreciation, amortization, depletion and accretion					3,094	4,010
Earnings from equity method investments	(2,389)		(21,437)		(3,222)	(39,749)
Operating lease expense					1,300	912
Stock-based compensation expense					948	987
Deferred income tax expense					0	6,817
Amortization of debt discount and debt issuance costs					0	945
Loss (gain) on change in estimate, asset retirement obligation	34		(1,942)		34	(1,942)	$ 2,700
Other non-cash items, net					449	(319)
Changes in operating assets and liabilities:
Receivables and related party receivables					2,444	1,362
Prepaid expenses and other assets					(779)	(723)
Inventories, net					(4,079)	1,327
Other long-term assets, net					2,942	(2,746)
Accounts payable and accrued expenses					(2,509)	(447)
Other current liabilities					(450)	(1,468)
Operating lease liabilities					1,999	2,048
Other long-term liabilities					649	(2,334)
Distributions from equity method investees, return on investment					2,297	19,144
Net cash provided by operating activities					1,758	18,151
Cash flows from investing activities
Distributions from equity method investees in excess of cumulative earnings					3,316	24,732
Acquisition of property, plant, equipment, and intangible assets, net					(2,889)	(4,573)
Mine development costs					(326)	(653)
Proceeds from sale of property and equipment					1,204	895
Net cash provided by investing activities					1,305	20,401
Cash flows from financing activities
Principal payments on finance lease obligations					(594)	(818)
Repurchase of common shares to satisfy tax withholdings					(385)	(241)
Dividends paid					(45)	(90)
Principal payments on term loan					0	(16,000)
Net cash used in financing activities					(1,024)	(17,149)
Increase in Cash and Restricted Cash					2,039	21,403
Cash and Restricted Cash, beginning of period		$ 88,780		$ 35,932	88,780	35,932	35,932
Cash and Restricted Cash, end of period	$ 90,819		$ 57,335		90,819	57,335	$ 88,780
Supplemental disclosure of non-cash investing and financing activities:
Acquisition of property and equipment through finance lease					1,641	0
Acquisition of property and equipment through accounts payable					$ 173	$ 163

Basis of Presentation

Basis of Presentation	6 Months Ended
	Jun. 30, 2022
Accounting Policies [Abstract]
Basis of Presentation	Basis of Presentation Nature of Operations Advanced Emissions Solutions, Inc. ("ADES" or the "Company") is a Delaware corporation with its principal office located in Greenwood Village, Colorado and operations located in Louisiana. The Company is principally engaged in the sale of consumable air and water treatment solutions including activated carbon ("AC") and chemical technologies. The Company's proprietary technologies in the advanced purification technologies ("APT") market enable customers to reduce air and water contaminants, including mercury and other pollutants, to maximize utilization levels and to improve operating efficiencies to meet the challenges of existing and pending air quality and water regulations. The Company manufactures and sells AC used to capture and remove contaminants for coal-fired power, industrial and water treatment markets. The Company also owns an associated lignite mine ("Five Forks Mine") which supplies the primary raw material for manufacturing AC. Through December 31, 2021, the Company generated substantial earnings from its equity ownership in Tinuum Group, LLC ("Tinuum Group") and Tinuum Services, LLC ("Tinuum Services"), both of which are unconsolidated entities. Both Tinuum Group and Tinuum Services ceased material operations effective December 31, 2021 as a result of the expiration of a tax credit program under Internal Revenue Code Section 45 - Production Tax Credit (the "Section 45 Tax Credit Program"). Tinuum Group provided reduction of mercury and nitrogen oxide ("NOx") emissions at select coal-fired power generators through the production and sale of refined coal ("RC") that qualified for tax credits under the Section 45 Tax Credit Program ("Section 45 tax credits"). The Company also earned royalties for technologies which were licensed to Tinuum Group and used at certain RC facilities to enhance combustion and reduce emissions of NOx and mercury from coal burned to generate electrical power. Tinuum Services operated and maintained the RC facilities under operating and maintenance agreements with Tinuum Group and owners or lessees of the RC facilities. Presently, both Tinuum Group and Tinuum Services continue to wind-down their operations, and the Company expects to receive final cash distributions, which are not expected to be significant, from these entities during 2022. Basis of Presentation The accompanying Condensed Consolidated Financial Statements of ADES are unaudited and have been prepared in conformity with accounting principles generally accepted in the United States ("U.S. GAAP") and with Article 10 of Regulation S-X of the Securities and Exchange Commission. In compliance with those instructions, certain information and footnote disclosures normally included in annual consolidated financial statements prepared in accordance with U.S. GAAP have been condensed or omitted. The unaudited Condensed Consolidated Financial Statements of ADES in this quarterly report ("Quarterly Report") are presented on a consolidated basis and include ADES and its wholly-owned subsidiaries (collectively, the "Company"). Also included within the unaudited Condensed Consolidated Financial Statements are the Company's unconsolidated equity investments, Tinuum Group and Tinuum Services, which are accounted for under the equity method of accounting, and Highview Enterprises Limited (the "Highview Investment"), which is accounted for in accordance with U.S. GAAP applicable to equity investments that do not qualify for the equity method of accounting. Results of operations and cash flows for the interim periods are not necessarily indicative of the results that may be expected for the entire year. All significant intercompany transactions and accounts were eliminated in consolidation for all periods presented in this Quarterly Report. In the opinion of management, these Condensed Consolidated Financial Statements include all normal and recurring adjustments considered necessary for a fair presentation of the results of operations, financial position, stockholders' equity and cash flows for the interim periods presented. These Condensed Consolidated Financial Statements should be read in conjunction with the Company’s Annual Report on Form 10-K for the year ended December 31, 2021 (the "2021 Form 10-K"). Significant accounting policies disclosed therein have not changed. Earnings (Loss) Per Share Basic earnings (loss) per share is computed using the weighted-average number of shares of common stock outstanding during the reporting period. Diluted earnings (loss) per share is computed in a manner consistent with that of basic earnings per share, while considering other potentially dilutive securities. For the three and six months ended June 30, 2022 and June 30, 2021, potentially dilutive securities consist of unvested restricted stock awards ("RSA's") and contingent performance stock units ("PSU's"). The following table sets forth the calculations of basic and diluted (loss) earnings per share: Three Months Ended June 30, Six Months Ended June 30, (in thousands, except per share amounts) 2022 2021 2022 2021 Net (loss) income $ (326) $ 16,590 $ (3,359) $ 30,327 Basic weighted-average common shares outstanding 18,473 18,271 18,409 18,219 Add: dilutive effect of equity instruments — 127 — 137 Diluted weighted-average shares outstanding 18,473 18,398 18,409 18,356 (Loss) earnings per share - basic $ (0.02) $ 0.91 $ (0.18) $ 1.66 (Loss) earnings per share - diluted $ (0.02) $ 0.90 $ (0.18) $ 1.65 For the three and six months ended June 30, 2022 and 2021, potentially dilutive securities of 0.8 million and 0.1 million shares, and 0.7 million and zero shares of common stock, respectively, were outstanding but were not included in the calculation of diluted net (loss) income per share because the effect would have been anti-dilutive. Use of Estimates The preparation of financial statements in conformity with U.S. GAAP requires management to make estimates and assumptions that affect the amounts reported in the financial statements and accompanying notes. There have been no changes in the Company’s critical accounting estimates from those that were disclosed in the 2021 Form 10-K. Actual results could differ from these estimates. Risks and Uncertainties The loss of earnings and cash distributions from both Tinuum Group and Tinuum Services will continue to have a material adverse impact on the Company’s financial position, results of operations and cash flows. For 2022, the Company is principally dependent on operations of its APT business and its cash on hand to provide liquidity over the near and long term. The Company's revenues, sales volumes, earnings and cash flows are significantly affected by prices of competing power generation sources such as natural gas and renewable energy. During periods of low natural gas prices, natural gas provides a competitive alternative to coal-fired power generation and therefore, coal consumption may be reduced, which in turn reduces the demand for the Company's products. However, during periods of higher prices for competing power generation sources, there is an increase in coal consumption and thus demand for the Company's products also increases. In addition, coal consumption and demand for the Company's products are affected by the demand for electricity, which is higher in the warmer and colder months of the year. As a result, the Company's interim period results are subject to seasonal variations whereby its revenues and cost of revenues tend to be higher in its first and third fiscal quarters compared to its second and fourth fiscal quarters. Abnormal temperatures during the summer and winter months may significantly affect coal consumption and impurities within various municipalities' water sources, and thus impact the demand for the Company's products. Concentration of credit risk The Company is exposed to concentrations of credit risk primarily related to cash held at financial institutions and accounts receivable. The Company regularly monitors its credit risk to mitigate the possibility of current and future exposures resulting in a loss. Historically, the losses related to credit risk have been immaterial. The Company holds cash at two financial institutions as of June 30, 2022. If a financial institution was unable to perform its obligations, the Company would be at risk regarding the amount of cash and investments in excess of the Federal Deposit Insurance Corporation limits (currently $250 thousand) that would be returned to the Company. The Company evaluates the creditworthiness of its customers prior to entering into an agreement to sell its products and, as necessary, through the life of the customer relationship. Reclassifications Certain balances have been reclassified from the prior year to conform to the current year presentation. Such reclassifications had no effect on the Company’s results of operations or financial position in any of the periods presented. Segments Operating 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, in deciding how to allocate resources and in assessing financial performance. As of June 30, 2022, the Company's CODM was the Company's Chief Executive Officer, and the Company concluded that APT was its one reportable segment. Given the wind-down of Tinuum Group and Tinuum Services and the impact on the Company's financial statements, the Company determined the historical RC segment no longer met the qualitative or quantitative criteria to be considered a reporting segment under U.S. GAAP. As a result, including the method in which the CODM allocates resources, beginning January 1, 2022, the Company determined that it had one reportable segment and therefore has removed its segment disclosures for this Quarterly Report. New Accounting Standards In June 2016, the FASB issued ASU 2016-13, Financial Instruments - Credit Losses (Topic 326) Measurement of Credit Losses on Financial Instruments ("ASU 2016-13"). The main objective of ASU 2016-13 is to provide financial statement users with more decision-useful information about the expected credit losses on financial instruments and other commitments to extend credit held by a reporting entity at each reporting date. To achieve this objective, the amendments in ASU 2016-13 replace the incurred loss impairment methodology in current U.S. GAAP with a methodology that reflects expected credit losses and requires consideration of a broader range of reasonable and supportable information to form credit loss estimates. ASU 2016-13 is effective for "smaller reporting companies" (as defined by the Securities and Exchange Commission) for fiscal years beginning after December 15, 2022, including interim periods within those years, and must be adopted under a modified retrospective method approach. The Company intends to adopt ASU 2016-13 effective January 1, 2023 and is currently evaluating the provisions of this guidance and assessing the impact on its financial statements and disclosures. The Company does not believe this standard will have a material impact on its financial statements and disclosures.

Customer Supply Agreement

Customer Supply Agreement	6 Months Ended
	Jun. 30, 2022
Additional Term of Contract [Abstract]
Customer Supply Agreement	Customer Supply Agreement On September 30, 2020, the Company and Norit Activated Carbon - Americas (f/k/a Cabot Norit Americas, Inc.) ("Norit"), entered into a supply agreement (the "Supply Agreement") pursuant to which the Company agreed to sell and deliver to Norit, and Norit agreed to purchase and accept from the Company certain lignite-based AC products ("Furnace Products"). The term of the Supply Agreement is for 15 years with 10-year renewal terms that are automatic unless either party provides three years prior notice of intention not to renew before the end of any term. Under the Supply Agreement, Norit also reimburses the Company for certain capital expenditures incurred by the Company that are necessary to manufacture the Furnace Products. Reimbursements are comprised of revenues earned from capital expenditures incurred that will benefit both the Company and Norit (referred to as "Shared Capital") and revenues earned from capital expenditures incurred that will benefit Norit exclusively (referred to as "Specific Capital"). In the event that Norit ceases to make purchases under the Supply Agreement, Norit is obligated to pay the balance of any outstanding payments for Specific Capital. Further, under the terms of the Supply Agreement, Norit was obligated to pay the Reclamation Reimbursement (defined in Note 3 below) to the Company for $10.2 million of the Reclamation Costs (defined in Note 3 below) , inclusive of interest. The Company recorded the Norit Receivable for the Reclamation Reimbursement at its estimated fair value, which was measured using a discounted cash flows valuation model that considered the estimated credit risk associated with the obligor's (Norit's) future performance, which the Company estimated was approximately 1.5%. On February 25, 2022, the Company received $10.6 million in cash from Norit (the "Norit Payment") as a result of a change in control provision in the Supply Agreement (the "Change in Control"), which occurred as a result of the sale of Norit by its parent, Cabot Corporation. Under the Change in Control, the Company received from Norit full payment of all amounts outstanding under the Reclamation Reimbursement, payment of all unbilled amounts related to Specific Capital for expenditures incurred through February 28, 2022 and payment of $0.8 million related to additional costs due to the third-party operator of Marshall Mine (the "Norit Reclamation Costs"). Under the Reclamation Contract (defined in Note 3 below), the Company was obligated to remit payment for the Norit Reclamation Costs to the third-party operator of Marshall Mine, and such payment was remitted in March 2022. The Change in Control did not impact any other provisions of the Supply Agreement. As of February 25, 2022, the carrying value of the Reclamation Reimbursement was $9.0 million, which included the principal balance, adjusted for accretion of interest and payments made to date. Under the Change in Control, the Company received $8.5 million in cash for full payment of the outstanding Reclamation Reimbursement. The Company concluded that the cash proceeds received represented an early payment of a receivable based on a change in contractual terms and accounted for the difference between the cash proceeds received and the carrying amount of the Reclamation Reimbursement of $0.5 million as a loss for the three months ended March 31, 2022, which is included in the "Other Income (Expense)" line item in the Condensed Consolidated Statement of Operations for the six months ended June 30, 2022. Also, under the Change in Control, the Company received $1.3 million in advance of revenue to be recognized in future periods related to Specific Capital and recorded this amount as deferred revenue, which is recognized ratably over the remaining contractual term as stipulated in the Supply Agreement.

Acquisition of Marshall Mine

Acquisition of Marshall Mine	6 Months Ended
	Jun. 30, 2022
Business Combination and Asset Acquisition [Abstract]
Acquisition of Marshall Mine	Acquisition of Marshall Mine Concurrently with the execution of the Supply Agreement, on September 30, 2020, the Company entered into an agreement to purchase from Norit 100% of the membership interests in Marshall Mine, LLC (the "Marshall Mine Acquisition") for a nominal cash purchase price. Marshall Mine, LLC owns a lignite mine located outside of Marshall, Texas (the "Marshall Mine"). The Company concluded that the Marshall Mine did not have any remaining economic reserves and independently determined to immediately commence activities to shutter it. Accordingly, on September 30, 2020, the Company and a third party entered into a reclamation contract (the "Reclamation Contract") for full reclamation of the Marshall Mine, which is expected to be completed by 2030. Under the terms of the Supply Agreement, Norit was obligated to reimburse the Company for $10.2 million (the "Reclamation Reimbursement") for a portion of the total costs incurred under the Reclamation Contract (the "Reclamation Costs"), which was payable semi-annually over 13 years and inclusive of interest. As discussed in Note 2, on February 25, 2022 as part of the Change in Control, Norit fully paid the outstanding amount owed under the Reclamation Reimbursement and has no further liability related to the Marshall Mine. The Company accounted for the Marshall Mine Acquisition as an asset acquisition, and it included the acquisition of certain assets and assumption of certain liabilities as well as the incurrence of an obligation for the Reclamation Costs (the "Marshall Mine ARO"). As of June 30, 2022 and December 31, 2021, the carrying value of the Marshall Mine ARO was $4.8 million and $6.3 million, respectively. As the Marshall Mine Acquisition represented a transaction with a customer of net assets acquired and liabilities assumed from Norit, the Company accounted for the excess of the fair value of liabilities assumed over assets acquired as upfront consideration transferred to a customer, Norit (the "Upfront Customer Consideration"). The amount of the Upfront Customer Consideration was also recognized net of the Reclamation Reimbursement. The total Upfront Customer Consideration is being amortized as a reduction to revenues on a straight-line basis over the expected 15-year contractual period of the Supply Agreement. Amortization of the Upfront Customer Consideration is approximately $0.5 million per year. The Company also evaluated Marshall Mine, LLC as a potential variable interest entity ("VIE") and determined that it was a VIE and the Company was its primary beneficiary. Therefore, the Company consolidates Marshall Mine, LLC's assets and liabilities in its consolidated financial statements. The following tables summarize the assets and liabilities of Marshall Mine, LLC and their classification in the Company's Condensed Consolidated Balance Sheets: As of (in thousands) June 30, 2022 December 31, 2021 Balance sheet component Cash $ 1,501 $ 914 Current assets Norit receivable, short-term — 2,056 Current assets Prepaid expenses and other current assets 249 — Current assets Restricted cash 10,000 10,027 Non-current assets Property and equipment, net 3 1,968 Non-current assets Norit receivable, long-term — 6,846 Non-current assets $ 11,753 $ 21,811 Accounts payable and accrued liabilities $ 447 $ 1,065 Current liabilities Asset retirement obligation, short-term 291 1,775 Current liabilities Asset retirement obligation, long-term 4,474 4,546 Non-current liabilities $ 5,212 $ 7,386

Leases

Leases	6 Months Ended
	Jun. 30, 2022
Leases [Abstract]
Leases	Leases The Company's operating and finance lease right-of-use ("ROU") assets and liabilities as of June 30, 2022 and December 31, 2021 consisted of the following items (in thousands): As of Leases June 30, 2022 December 31, 2021 Operating Leases Operating lease right-of-use assets, net of accumulated amortization (1) $ 8,118 $ 6,000 Operating lease obligations, current $ 2,742 $ 2,157 Long-term operating lease obligations 5,592 4,178 Total operating lease obligation $ 8,334 $ 6,335 Finance Leases Finance lease right-of-use assets, net of accumulated amortization (2) $ 3,013 $ 1,743 Finance lease obligations, current $ 1,235 $ 1,011 Long-term finance lease obligations 3,998 3,152 Total finance lease obligations $ 5,233 $ 4,163 (1) Operating lease ROU assets are reported net of accumulated amortization of $2.9 million and $1.9 million as of June 30, 2022 and December 31, 2021, respectively. (2) Finance lease ROU assets are reported net of accumulated amortization of $1.5 million and $1.1 million as of June 30, 2022 and December 31, 2021, respectively. Operating leases ROU assets under operating leases and operating lease liabilities are included in the " Other long-term assets Other current liabilities Other long-term liabilities Lease expense for operating leases for the three and six months ended June 30, 2022 was $1.0 million and $2.0 million, respectively, of which $0.9 million and $1.8 million, respectively, is included in the "Consumables - cost of revenue, exclusive of depreciation and amortization" line item and $0.1 million and $0.2 million, respectively, is included in the "General and administrative" line item in the Condensed Consolidated Statements of Operations for those periods. Lease expense for operating leases for the three and six months ended June 30, 2021 was $0.9 million and $1.9 million, respectively of which $0.8 million and $1.7 million, respectively, is included in the "Consumables - cost of revenue, exclusive of depreciation and amortization" line item and $0.1 million and $0.2 million, respectively, is included in "General and administrative" line item in the Condensed Consolidated Statements of Operations for those periods. Finance leases ROU assets under finance leases are included in the "Property, plant and equipment" line item in the Condensed Consolidated Balance Sheets as of June 30, 2022 and December 31, 2021. Interest expense related to finance lease obligations and amortization of ROU assets under finance leases are included in the "Interest expense" and "Depreciation, amortization, depletion and accretion" line items, respectively, in the Condensed Consolidated Statements of Operations for the three and six months ended June 30, 2022 and 2021. Lease financial information as of and for the three and six months ended June 30, 2022 and 2021 is provided in the following table: Three Months Ended June 30, Six Months Ended June 30, (in thousands) 2022 2021 2022 2021 Finance lease cost: Amortization of right-of-use assets $ 230 $ 174 $ 371 $ 348 Interest on lease liabilities 86 70 164 149 Operating lease cost 778 626 1,584 1,085 Short-term lease cost 216 233 459 800 Variable lease cost (1) 3 12 7 21 Total lease cost $ 1,313 $ 1,115 $ 2,585 $ 2,403 Other Information: Cash paid for amounts included in the measurement of lease liabilities: Operating cash flows for finance leases $ 164 $ 149 Operating cash flows for operating leases $ 1,419 $ 1,314 Financing cash flows for finance leases $ 594 $ 818 Right-of-use assets obtained in exchange for new finance lease liabilities $ 1,641 $ — Right-of-use assets obtained in exchange for new operating lease liabilities $ 3,418 $ 3,362 Weighted-average remaining lease term - finance leases 3.2 years 3.3 years Weighted-average remaining lease term - operating leases 4.3 years 2.9 years Weighted-average discount rate - finance leases 5.9 % 6.4 % Weighted-average discount rate - operating leases 5.9 % 7.8 % (1) Primarily includes common area maintenance, property taxes and insurance payable to lessors.
Leases	Leases The Company's operating and finance lease right-of-use ("ROU") assets and liabilities as of June 30, 2022 and December 31, 2021 consisted of the following items (in thousands): As of Leases June 30, 2022 December 31, 2021 Operating Leases Operating lease right-of-use assets, net of accumulated amortization (1) $ 8,118 $ 6,000 Operating lease obligations, current $ 2,742 $ 2,157 Long-term operating lease obligations 5,592 4,178 Total operating lease obligation $ 8,334 $ 6,335 Finance Leases Finance lease right-of-use assets, net of accumulated amortization (2) $ 3,013 $ 1,743 Finance lease obligations, current $ 1,235 $ 1,011 Long-term finance lease obligations 3,998 3,152 Total finance lease obligations $ 5,233 $ 4,163 (1) Operating lease ROU assets are reported net of accumulated amortization of $2.9 million and $1.9 million as of June 30, 2022 and December 31, 2021, respectively. (2) Finance lease ROU assets are reported net of accumulated amortization of $1.5 million and $1.1 million as of June 30, 2022 and December 31, 2021, respectively. Operating leases ROU assets under operating leases and operating lease liabilities are included in the " Other long-term assets Other current liabilities Other long-term liabilities Lease expense for operating leases for the three and six months ended June 30, 2022 was $1.0 million and $2.0 million, respectively, of which $0.9 million and $1.8 million, respectively, is included in the "Consumables - cost of revenue, exclusive of depreciation and amortization" line item and $0.1 million and $0.2 million, respectively, is included in the "General and administrative" line item in the Condensed Consolidated Statements of Operations for those periods. Lease expense for operating leases for the three and six months ended June 30, 2021 was $0.9 million and $1.9 million, respectively of which $0.8 million and $1.7 million, respectively, is included in the "Consumables - cost of revenue, exclusive of depreciation and amortization" line item and $0.1 million and $0.2 million, respectively, is included in "General and administrative" line item in the Condensed Consolidated Statements of Operations for those periods. Finance leases ROU assets under finance leases are included in the "Property, plant and equipment" line item in the Condensed Consolidated Balance Sheets as of June 30, 2022 and December 31, 2021. Interest expense related to finance lease obligations and amortization of ROU assets under finance leases are included in the "Interest expense" and "Depreciation, amortization, depletion and accretion" line items, respectively, in the Condensed Consolidated Statements of Operations for the three and six months ended June 30, 2022 and 2021. Lease financial information as of and for the three and six months ended June 30, 2022 and 2021 is provided in the following table: Three Months Ended June 30, Six Months Ended June 30, (in thousands) 2022 2021 2022 2021 Finance lease cost: Amortization of right-of-use assets $ 230 $ 174 $ 371 $ 348 Interest on lease liabilities 86 70 164 149 Operating lease cost 778 626 1,584 1,085 Short-term lease cost 216 233 459 800 Variable lease cost (1) 3 12 7 21 Total lease cost $ 1,313 $ 1,115 $ 2,585 $ 2,403 Other Information: Cash paid for amounts included in the measurement of lease liabilities: Operating cash flows for finance leases $ 164 $ 149 Operating cash flows for operating leases $ 1,419 $ 1,314 Financing cash flows for finance leases $ 594 $ 818 Right-of-use assets obtained in exchange for new finance lease liabilities $ 1,641 $ — Right-of-use assets obtained in exchange for new operating lease liabilities $ 3,418 $ 3,362 Weighted-average remaining lease term - finance leases 3.2 years 3.3 years Weighted-average remaining lease term - operating leases 4.3 years 2.9 years Weighted-average discount rate - finance leases 5.9 % 6.4 % Weighted-average discount rate - operating leases 5.9 % 7.8 % (1) Primarily includes common area maintenance, property taxes and insurance payable to lessors.

Revenues

Revenues	6 Months Ended
	Jun. 30, 2022
Revenue from Contract with Customer [Abstract]
Revenues	Revenues Trade receivables represent an unconditional right to consideration in exchange for goods or services transferred to a customer. The Company invoices its customers in accordance with the terms of the contract. Credit terms are generally net 30 from the date of invoice. The timing between the satisfaction of performance obligations and when payment is due from the customer is generally not significant. Contract liabilities are comprised of deferred revenue, which represents an obligation to transfer goods or services to a customer for which the Company has received consideration from the customer and, if deliverable within one year or less, is included in "Other current liabilities" in the Consolidated Balance Sheets and, if deliverable outside of one year, is included in "Other long-term liabilities" in the Consolidated Balance Sheets. The following table shows the components of the Company's Receivables, net: As of (in thousands) June 30, 2022 December 31, 2021 Trade receivables, net $ 12,589 $ 10,476 Other receivables 70 — Norit Receivable - current — 2,146 Receivables, net $ 12,659 $ 12,622 For the three and six months ended June 30, 2022 and 2021, all material performance obligations related to revenues recognized were satisfied at a point in time. For the three and six months ended June 30, 2022, approximately 8% and 9%, respectively, of Consumables revenues were generated in Canada, and all other revenues were generated in the U.S. For the three and six months ended June 30, 2021, approximately 10% and 15%, respectively, of Consumables revenues were generated in Canada, and all other revenues were generated in the U.S.

Inventories, net

Inventories, net	6 Months Ended
	Jun. 30, 2022
Inventory Disclosure [Abstract]
Inventories, net	Inventories, net The following table summarizes the Company's inventories recorded at the lower of average cost or net realizable value as of June 30, 2022 and December 31, 2021: As of (in thousands) June 30, 2022 December 31, 2021 Product inventory, net $ 6,072 $ 4,901 Raw material inventory 6,037 2,949 $ 12,109 $ 7,850

Commitments and Contingencies

Commitments and Contingencies	6 Months Ended
	Jun. 30, 2022
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Commitments and Contingencies Retention Agreements On May 4, 2022, the Compensation Committee of the Board of Directors and the Board of Directors (the "Board") approved the amendment to retention agreements (the "Retention Agreements" and each a "Retention Agreement"), which had been executed in May 2021, between the Company and its executive officers and certain other key employees in order to maintain the Company's business operations while it pursues and executes on its strategic initiatives (the "Amended Retention Agreements"). Under the Amended Retention Agreements, employees will receive (i) 40% of the original amount agreed to in the Retention Agreements ("Retention Pay") in August 2022; (ii) 60% of the Retention Pay on the earliest of (1) the date the employee’s employment is terminated without Cause or for Good Reason (as those terms are defined in the Retention Agreement or the employee’s employment agreement, as applicable), (2) 90 days after a Transaction Date or a Change in Control (as those terms are defined in the Retention Agreement or the employee’s employment agreement, as applicable), or (3) in January 2023; and (iii) an additional lump sum payment, ranging from 10% to 40% of the Retention Pay, will also be paid at the earliest of (1) the date the employee’s employment is terminated without Cause or for Good Reason (as those terms are defined in the Retention Agreement or the employee’s employment agreement, as applicable), (2) 90 days after a Transaction Date or a Change in Control (as those terms are defined in the Retention Agreement or the employee’s employment agreement, as applicable), or (3) in January 2023. In order to receive the Amended Retention Agreements payments, employees must remain employed at the Company through the dates above. As of June 30, 2022, the total cash payable pursuant to the Amended Retention Agreements is $2.5 million and is included in the "Other current liabilities" line item in the Condensed Consolidated Balance Sheet. Surety Bonds and Restricted Cash As the owner of the Marshall Mine, the Company is required to post a surety bond with a regulatory commission. As of June 30, 2022 and December 31, 2021, the Company had posted a $16.6 million surety bond (the "MM Surety Bond") which will remain in place until the Marshall Mine is fully reclaimed, and may be further reduced in amount from time to time as the Company progresses with its reclamation activities. As the owner of the Five Forks Mine, the Company is required to post a surety bond with a regulatory commission. As of June 30, 2022 and December 31, 2021 , the Company had posted a $7.5 million surety bond related to performance requirements associated with the Five Forks Mine. As of June 30, 2022 and December 31, 2021, the Company posted collateral of $10.0 million for both the Marshall Mine and Five Forks Mine as required by the Company's surety bond provider, which is reported as long-term restricted cash on the Condensed Consolidated Balance Sheets. Tinuum Group The Company has certain limited obligations contingent upon future events in connection with the activities of Tinuum Group. The Company, NexGen Refined Coal, LLC ("NexGen") and two entities affiliated with NexGen have provided an affiliate of the Goldman Sachs Group, Inc. with limited guaranties (the "Tinuum Group Party Guaranties") related to certain losses it may suffer as a result of inaccuracies or breach of representations and covenants committed by Tinuum Group. The Company also is a party to a contribution agreement with NexGen under which any party called upon to pay on a Tinuum Group Party Guaranty is entitled to receive contributions from the other party equal to 50% of the amount paid. The Company has not recorded a liability or expense provision related to this contingent obligation as it believes that it is not probable that a loss will occur with respect to the Tinuum Group Party Guaranties. Legal Proceedings

Supplemental Financial Informat

Supplemental Financial Information	6 Months Ended
	Jun. 30, 2022
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]
Supplemental Financial Information	Supplemental Financial Information Supplemental Balance Sheet Information The following table summarizes the components of Other long-term assets, net as presented in the Condensed Consolidated Balance Sheets: As of (in thousands) June 30, December 31, Other long-term assets, net: Right of use assets, operating leases, net $ 8,118 $ 6,000 Upfront Customer Consideration 6,728 6,982 Mine development costs, net 5,461 5,330 Spare parts, net 4,710 4,598 Mine reclamation asset, net 1,691 1,742 Intangible assets, net 1,028 1,237 Equity method investments — 2,391 Other 1,839 1,745 Norit Receivable — 6,846 $ 29,575 $ 36,871 Spare parts include critical spares required to support plant operations. Parts and supply costs are determined using the lower of cost or estimated replacement cost. Parts are recorded as maintenance expenses in the period in which they are consumed or are capitalized if applicable. Mine development costs include acquisition costs, the cost of other development work and mitigation costs related to the Five Forks Mine and are depleted over the estimated life of the related mine reserves. The Company performs an evaluation of the recoverability of the carrying value of mine development costs to determine if facts and circumstances indicate that their carrying value may be impaired and if any adjustment is warranted. There were no indicators of impairment as of June 30, 2022. Mine reclamation asset, net represents an asset retirement obligation ("ARO") asset related to the Five Forks Mine and is depreciated over its estimated life. As of June 30, 2022 and December 31, 2021, Other includes the Highview Investment in the amount of $0.6 million and $0.6 million, respectively, that is carried at cost, less impairment, plus or minus observable changes in price for identical or similar investments of the same issuer. Fair value measurements, if any, represent Level 2 measurements. The Highview Investment is evaluated for indicators of impairment such as an event or change in circumstances that may have a significant adverse effect on the fair value of the investment. There were no changes to the carrying value of the Highview Investment for the three and six months ended June 30, 2022 as there were no indicators of impairment or observable price changes for identical or similar investments. The following table details the components of Other current liabilities and Other long-term liabilities as presented in the Condensed Consolidated Balance Sheets: As of (in thousands) June 30, December 31, Other current liabilities: Current portion of operating lease obligations $ 2,742 $ 2,157 Income and other taxes payable 1,173 807 Other 1,287 2,160 $ 5,202 $ 5,124 Other long-term liabilities: Mine reclamation liabilities $ 8,203 $ 8,184 Operating lease obligations, long-term 5,592 4,178 Other 867 — $ 14,662 $ 12,362 The Mine reclamation liability related to the Five Forks Mine is included in Other long-term liabilities. The Mine reclamation liability related to Marshall Mine is included in Other current liabilities and Other long-term liabilities. The Mine reclamation liabilities represent AROs and changes for the three and six months ended June 30, 2022 and year ended December 31, 2021 were as follows: As of (in thousands) June 30, 2022 December 31, 2021 Asset retirement obligations, beginning of period $ 9,959 $ 21,447 Accretion 308 1,102 Liabilities settled (1,807) (10,010) Changes due to scope and timing of reclamation (1) 34 (2,580) Asset retirement obligations, end of period 8,494 9,959 Less current portion 291 1,775 Asset retirement obligations, long-term $ 8,203 $ 8,184 (1) As of June 30, 2021 and December 31, 2021, the Company revised its estimate of future obligations owed for the reclamation of the Marshall Mine primarily based on scope reductions related to future reclamation requirements. As a result, the Company reduced the Marshall Mine ARO by $2.7 million and recorded a corresponding gain on change in estimate of $2.7 million for the year ended December 31, 2021.

Equity Method Investments

Equity Method Investments	6 Months Ended
	Jun. 30, 2022
Equity Method Investments and Joint Ventures [Abstract]
Equity Method Investments	Equity Method Investments Tinuum Group, LLC As of June 30, 2022 and December 31, 2021, the Company's ownership interest in Tinuum Group was 42.5%. Tinuum Group supplied technology equipment and technical services at select coal-fired generators, but its primary purpose was to put into operation facilities that produced and sold RC that lowered emissions and also qualified for Section 45 tax credits. The Company concluded that Tinuum Group was a VIE, but the Company did not have the power to direct the activities that most significantly impacted Tinuum Group's economic performance, as the voting partners of Tinuum Group have identical voting rights, equity control interests and board control interests, and therefore power was shared. Accordingly, the Company has accounted for its investment in Tinuum Group under the equity method of accounting since inception. The following table summarizes the results of operations of Tinuum Group: Three Months Ended June 30, Six Months Ended June 30, (in thousands) 2022 2021 2022 2021 Gross profit $ — $ 8,820 $ 964 $ 11,495 Operating, selling, general and administrative expenses 1,051 12,429 4,248 26,231 Loss from operations (1,051) (3,609) (3,284) (14,736) Other income (expenses), net 27 3,150 528 4,003 (Income) loss attributable to noncontrolling interest (580) 29,038 (874) 64,616 Net (loss) income available to members $ (1,604) $ 28,579 $ (3,630) $ 53,883 ADES equity earnings from Tinuum Group $ 2,125 $ 19,125 $ 3,137 $ 35,487 For the three and six months ended June 30, 2022 and 2021, the Company recognized earnings from Tinuum Group's net (loss) income available to members that were different from its pro-rata share of Tinuum Group's net (loss) income available to members for those periods, as cash distributions for the three and six months ended June 30, 2022 and 2021 exceeded the carrying value of the Tinuum Group equity investment. The following tables present the Company's investment balance, equity earnings and cash distributions in excess of the investment balance, if any, for the three and six months ended June 30, 2022 and 2021 ( in thousands ): Description Date(s) Investment balance ADES equity earnings Cash distributions Memorandum Account: Cash distributions and equity earnings in (excess) of investment balance Beginning balance 12/31/2021 $ — $ — $ — $ (21,779) ADES proportionate share of net loss from Tinuum Group First Quarter (861) (861) — — Recovery of prior cash distributions in excess of investment balance (prior to cash distributions) First Quarter (21,779) (21,779) — 21,779 Cash distributions from Tinuum Group First Quarter (1,012) — 1,012 — Adjustment for current year cash distributions in excess of investment balance First Quarter 23,652 23,652 — (23,652) Total investment balance, equity earnings and cash distributions 3/31/2022 $ — $ 1,012 $ 1,012 $ (23,652) ADES proportionate share of net loss from Tinuum Group Second Quarter (682) $ (682) $ — — Recovery of prior cash distributions in excess of investment balance (prior to cash distributions) Second Quarter (23,652) (23,652) — 23,652 Cash distributions from Tinuum Group Second Quarter (2,125) — 2,125 — Adjustment for current year cash distributions in excess of investment balance Second Quarter 26,459 26,459 — (26,459) Total investment balance, equity earnings and cash distributions 6/30/2022 $ — $ 2,125 $ 2,125 $ (26,459) Description Date(s) Investment balance ADES equity earnings Cash distributions Memorandum Account: Cash distributions and equity earnings in (excess) of investment balance Beginning balance 12/31/2020 $ 3,387 $ — $ — $ — ADES proportionate share of net income from Tinuum Group First Quarter 10,755 10,755 — — Cash distributions from Tinuum Group First Quarter (19,749) — 19,749 — Adjustment for current year cash distributions in excess of investment balance First Quarter 5,607 5,607 — (5,607) Total investment balance, equity earnings and cash distributions 3/31/2021 $ — $ 16,362 $ 19,749 $ (5,607) ADES proportionate share of net income from Tinuum Group Second Quarter $ 12,146 $ 12,146 $ — $ — Recovery of prior cash distributions in excess of investment balance (prior to cash distributions) Second Quarter (5,607) (5,607) — 5,607 Cash distributions from Tinuum Group Second Quarter (19,125) — 19,125 — Adjustment for current year cash distributions in excess of investment balance Second Quarter 12,586 12,586 — (12,586) Total investment balance, equity earnings and cash distributions 6/30/2021 $ — $ 19,125 $ 19,125 $ (12,586) Tinuum Services, LLC The Company has a 50% voting and economic interest in Tinuum Services as of June 30, 2022 and December 31, 2021. The Company determined that Tinuum Services was not a VIE and further evaluated it for consolidation under the voting interest model. Because the Company did not own greater than 50% of the outstanding voting shares, either directly or indirectly, it has accounted for its investment in Tinuum Services under the equity method of accounting since inception. As of June 30, 2022 and December 31, 2021, the Company’s investment in Tinuum Services was zero and $2.4 million, respectively. The following table summarizes the results of operations of Tinuum Services: Three Months Ended June 30, Six Months Ended June 30, (in thousands) 2022 2021 2022 2021 Gross profit (loss) $ 78 $ (22,641) $ 1,046 $ (41,163) Operating, selling, general and administrative expenses 172 47,355 2,717 101,722 Loss from operations (94) (69,996) (1,671) (142,885) Other income (expenses), net 263 32 1,157 (394) (Income) loss attributable to noncontrolling interest — 74,587 323 151,802 Net income (loss) $ 169 $ 4,623 $ (191) $ 8,523 ADES equity earnings from Tinuum Services $ 264 $ 2,312 $ 84 $ 4,262 Included in the Condensed Consolidated Statements of Operations of Tinuum Services for the three and six months ended June 30, 2022 and 2021 was income (loss) attributable to noncontrolling interests of Tinuum Services' VIE entities, which was eliminated in the calculation of Tinuum Services' net income (loss) attributable to the Company's interest. For the three and six months ended June 30, 2022, the Company recognized earnings from Tinuum Services' net income (loss) available to members that were different from its pro-rata share of Tinuum Services' net income (loss) available to members for those periods, as cash distributions for the three and six months ended June 30, 2022 exceeded the carrying value of the Tinuum Services' equity investment. The following tables present the Company's investment balance, equity earnings and cash distributions in excess of the investment balance, if any, for the three and six months ended June 30, 2022 ( in thousands ): Description Date(s) Investment balance ADES equity earnings Cash distributions Memorandum Account: Cash distributions and equity earnings in (excess) of investment balance Beginning balance 12/31/2021 $ 2,391 $ — $ — $ — ADES proportionate share of net loss from Tinuum Services First Quarter (180) (180) — — Cash distributions from Tinuum Services First Quarter (1,501) — 1,501 — Total investment balance, equity earnings and cash distributions 3/31/2022 $ 710 $ (180) $ 1,501 $ — ADES proportionate share of net income from Tinuum Services Second Quarter $ 85 $ 85 $ — $ — Cash distributions from Tinuum Services Second Quarter (974) — 974 — Adjustment for current year cash distributions in excess of investment balance Second Quarter 179 179 — (179) Total investment balance, equity earnings and cash distributions 6/30/2022 $ — $ 264 $ 974 $ (179) The following table details the carrying value of the Company's respective equity method investments included in the Equity method investments line item on the Condensed Consolidated Balance Sheets and indicates the Company's maximum exposure to loss: As of (in thousands) June 30, December 31, Equity method investment in Tinuum Services $ — $ 2,391 Total equity method investments $ — $ 2,391 The following table details the components of the Company's respective equity method investments included in the "Earnings from equity method investments" line item on the Condensed Consolidated Statements of Operations: Three Months Ended June 30, Six Months Ended June 30, (in thousands) 2022 2021 2022 2021 Earnings from Tinuum Group $ 2,125 $ 19,125 $ 3,137 $ 35,487 Earnings from Tinuum Services 264 2,312 84 4,262 Earnings from other — — 1 — Earnings from equity method investments $ 2,389 $ 21,437 $ 3,222 $ 39,749 The following table details the components of the cash distributions from the Company's respective equity method investments included as a component of cash flows from operating activities and investing activities in the Condensed Consolidated Statements of Cash Flows. Distributions from equity method investees are reported in the Condensed Consolidated Statements of Cash Flows as "Distributions from equity method investees, return on investment" as a component of cash flows from operations until such time as the carrying value in an equity method investee company is reduced to zero. Thereafter, such distributions are reported as "Distributions from equity method investees in excess of cumulative earnings" as a component of cash flows from investing activities. Six Months Ended June 30, (in thousands) 2022 2021 Distributions from equity method investees, return on investment Tinuum Services $ 2,297 $ 5,002 Tinuum Group — 14,142 $ 2,297 $ 19,144 Distributions from equity method investees in excess of investment basis Tinuum Group $ 3,137 $ 24,732 Tinuum Services 179 — $ 3,316 $ 24,732

Stockholders' Equity

Stockholders' Equity	6 Months Ended
	Jun. 30, 2022
Equity [Abstract]
Stockholders' Equity	Stockholders' Equity Stock Repurchase Program In November 2018, the Board authorized the Company to purchase up to $20.0 million of its outstanding common stock under a stock repurchase program (the "Stock Repurchase Program"), which was to remain in effect until December 31, 2019 unless otherwise modified by the Board. In November 2019, the Board authorized an incremental $7.1 million to the Stock Repurchase Program and provided that it will remain in effect until all amounts are utilized or it is otherwise modified by the Board. As of June 30, 2022, the Company had $7.0 million remaining under the Stock Repurchase Program. Tax Asset Protection Plan U.S. federal income tax rules, and Section 382 of the Internal Revenue Code in particular, could substantially limit the use of net operating losses and tax credits if the Company experiences an "ownership change" (as defined in the Internal Revenue Code). In general, an ownership change occurs if there is a cumulative change in the ownership of the Company by "5 percent stockholders" that exceeds 50 percentage points over a rolling three-year period. On May 5, 2017, the Board approved the declaration of a dividend of rights to purchase Series B Junior Participating Preferred Stock for each outstanding share of common stock as part of a tax asset protection plan (the "TAPP") designed to protect the Company’s ability to utilize its net operating losses and tax credits. The TAPP is intended to act as a deterrent to any person acquiring beneficial ownership of 4.99% or more of the Company’s outstanding common stock. On March 15, 2022, the Board approved the Fifth Amendment to the TAPP (the "Fifth Amendment"), which amends the TAPP, as previously amended by the First, Second, Third and Fourth Amendments that were approved the Board on April 6, 2018, April 5, 2019, April 9, 2020 and April 9, 2021, respectively. The Fifth Amendment amends the definition of "Final Expiration Date" under the TAPP to extend the duration of the TAPP and makes associated changes in connection therewith. Pursuant to

Stock-Based Compensation

Stock-Based Compensation	6 Months Ended
	Jun. 30, 2022
Share-Based Payment Arrangement [Abstract]
Stock-Based Compensation	Stock-Based Compensation The Company grants equity-based awards to employees, non-employee directors and consultants that may include, but are not limited to, RSA's, PSU's, restricted stock units and stock options. Stock-based compensation expense related to manufacturing employees and administrative employees is included within the "Cost of revenue" and "Payroll and benefits" line items, respectively, in the Condensed Consolidated Statements of Operations. Stock-based compensation expense related to non-employee directors and consultants is included within the "General and administrative" line item in the Condensed Consolidated Statements of Operations. Total stock-based compensation expense for the three and six months ended June 30, 2022 and 2021 was as follows: Three Months Ended June 30, Six Months Ended June 30, (in thousands) 2022 2021 2022 2021 RSA expense $ 393 $ 511 $ 820 $ 918 PSU expense 91 55 128 69 Total stock-based compensation expense $ 484 $ 566 $ 948 $ 987 The amount of unrecognized compensation cost as of June 30, 2022, and the expected weighted-average period over which the cost will be recognized is as follows: As of June 30, 2022 (in thousands, expect years) Unrecognized Compensation Cost Expected Weighted- RSA expense $ 3,051 2.20 PSU expense 735 1.82 Total unrecognized stock-based compensation expense $ 3,786 2.13 Restricted Stock Restricted stock is typically granted with vesting terms of three years. The fair value of RSA's is determined based on the closing price of the Company’s common stock on the authorization date of the grant multiplied by the number of shares subject to the stock award. Compensation expense for RSA's is generally recognized on a straight-line basis over the entire vesting period. A summary of RSA activity under the Company's various stock compensation plans for the six months ended June 30, 2022 is presented below: Restricted Stock Weighted-Average Grant Date Fair Value Non-vested at January 1, 2022 531,623 $ 5.94 Granted 336,079 $ 6.40 Vested (229,871) $ 6.54 Forfeited (41,974) $ 6.00 Non-vested at June 30, 2022 595,857 $ 5.95 Performance Share Units Compensation expense is recognized for PSU's on a straight-line basis over the applicable service period, which is generally three years, based on the estimated fair value at the date of grant using a Monte Carlo simulation model. A summary of PSU activity for the six months ended June 30, 2022 is presented below: Units Weighted-Average Aggregate Intrinsic Value (in thousands) Weighted-Average PSU's outstanding, January 1, 2022 88,026 $ 6.65 Granted 60,565 9.59 Vested / Settled — — Forfeited / Canceled — — PSU's outstanding, June 30, 2022 148,591 $ 7.85 $ 697 1.82

Income Taxes

Income Taxes	6 Months Ended
	Jun. 30, 2022
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes For the three and six months ended June 30, 2022 and 2021, the Company's income tax expense and effective tax rates were: Three Months Ended June 30, Six Months Ended June 30, (in thousands, except for rate) 2022 2021 2022 2021 Income tax expense $ — $ 4,943 $ — $ 9,432 Effective tax rate — % 23 % — % 24 % The effective rate for the three and six months ended June 30, 2022 was zero, as the Company incurred pretax loss for this period and the resultant tax benefit was offset by a valuation allowance recorded as of June 30, 2022, as the Company expects to incur pretax loss for the year ended December 31, 2022. The effective rate for the three and six months ended June 30, 2021 was higher from the federal statutory rate primarily from the impact of estimated state income taxes. The Company assesses a valuation allowance recorded against deferred tax assets at each reporting date. The determination of whether a valuation allowance for deferred tax assets is appropriate requires the evaluation of positive and negative evidence that can be objectively verified. Consideration must be given to all sources of taxable income available to realize deferred tax assets, including, as applicable, the future reversal of existing temporary differences, future taxable income forecasts exclusive of the reversal of temporary differences and carryforwards, taxable income in carryback years and tax planning strategies. In estimating income taxes, the Company assesses the relative merits and risks of the appropriate income tax treatment of transactions taking into account statutory, judicial and regulatory guidance.

Basis of Presentation (Policies

Basis of Presentation (Policies)	6 Months Ended
	Jun. 30, 2022
Accounting Policies [Abstract]
Basis of Presentation	The accompanying Condensed Consolidated Financial Statements of ADES are unaudited and have been prepared in conformity with accounting principles generally accepted in the United States ("U.S. GAAP") and with Article 10 of Regulation S-X of the Securities and Exchange Commission. In compliance with those instructions, certain information and footnote disclosures normally included in annual consolidated financial statements prepared in accordance with U.S. GAAP have been condensed or omitted. The unaudited Condensed Consolidated Financial Statements of ADES in this quarterly report ("Quarterly Report") are presented on a consolidated basis and include ADES and its wholly-owned subsidiaries (collectively, the "Company"). Also included within the unaudited Condensed Consolidated Financial Statements are the Company's unconsolidated equity investments, Tinuum Group and Tinuum Services, which are accounted for under the equity method of accounting, and Highview Enterprises Limited (the "Highview Investment"), which is accounted for in accordance with U.S. GAAP applicable to equity investments that do not qualify for the equity method of accounting. Results of operations and cash flows for the interim periods are not necessarily indicative of the results that may be expected for the entire year. All significant intercompany transactions and accounts were eliminated in consolidation for all periods presented in this Quarterly Report.
Earnings (Loss) Per Share	Basic earnings (loss) per share is computed using the weighted-average number of shares of common stock outstanding duringthe reporting period. Diluted earnings (loss) per share is computed in a manner consistent with that of basic earnings per share, while considering other potentially dilutive securities. For the three and six months ended June 30, 2022 and June 30, 2021, potentially dilutive securities consist of unvested restricted stock awards ("RSA's") and contingent performance stock units ("PSU's").
Use of Estimates	The preparation of financial statements in conformity with U.S. GAAP requires management to make estimates and assumptions that affect the amounts reported in the financial statements and accompanying notes. There have been no changes in the Company’s critical accounting estimates from those that were disclosed in the 2021 Form 10-K. Actual results could differ from these estimates.
Risks and Uncertainties	The loss of earnings and cash distributions from both Tinuum Group and Tinuum Services will continue to have a material adverse impact on the Company’s financial position, results of operations and cash flows. For 2022, the Company is principally dependent on operations of its APT business and its cash on hand to provide liquidity over the near and long term. The Company's revenues, sales volumes, earnings and cash flows are significantly affected by prices of competing power generation sources such as natural gas and renewable energy. During periods of low natural gas prices, natural gas provides a competitive alternative to coal-fired power generation and therefore, coal consumption may be reduced, which in turn reduces the demand for the Company's products. However, during periods of higher prices for competing power generation sources, there is an increase in coal consumption and thus demand for the Company's products also increases. In addition, coal consumption and demand for the Company's products are affected by the demand for electricity, which is higher in the warmer and colder months of the year. As a result, the Company's interim period results are subject to seasonal variations whereby its revenues and cost of revenues tend to be higher in its first and third fiscal quarters compared to its second and fourth fiscal quarters. Abnormal temperatures during the summer and winter months may significantly affect coal consumption and impurities within various municipalities' water sources, and thus impact the demand for the Company's products.
Concentration of credit risk	The Company is exposed to concentrations of credit risk primarily related to cash held at financial institutions and accounts receivable. The Company regularly monitors its credit risk to mitigate the possibility of current and future exposures resulting in a loss. Historically, the losses related to credit risk have been immaterial. The Company holds cash at two financial institutions as of June 30, 2022. If a financial institution was unable to perform its obligations, the Company would be at risk regarding the amount of cash and investments in excess of the Federal Deposit Insurance Corporation limits (currently $250 thousand) that would be returned to the Company.
Reclassifications	Certain balances have been reclassified from the prior year to conform to the current year presentation. Such reclassifications had no effect on the Company’s results of operations or financial position in any of the periods presented.
Segments	Operating 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, in deciding how to allocate resources and in assessing financial performance. As of June 30, 2022, the Company's CODM was the Company's Chief Executive Officer, and the Company concluded that APT was its one reportable segment. Given the wind-down of Tinuum Group and Tinuum Services and the impact on the Company's financial statements, the Company determined the historical RC segment no longer met the qualitative or quantitative criteria to be considered a reporting segment under U.S. GAAP. As a result, including the method in which the CODM allocates resources, beginning January 1, 2022, the Company determined that it had one reportable segment and therefore has removed its segment disclosures for this Quarterly Report.
New Accounting Standards	In June 2016, the FASB issued ASU 2016-13, Financial Instruments - Credit Losses (Topic 326) Measurement of Credit Losses on Financial Instruments ("ASU 2016-13"). The main objective of ASU 2016-13 is to provide financial statement users with more decision-useful information about the expected credit losses on financial instruments and other commitments to extend credit held by a reporting entity at each reporting date. To achieve this objective, the amendments in ASU 2016-13 replace the incurred loss impairment methodology in current U.S. GAAP with a methodology that reflects expected credit losses and requires consideration of a broader range of reasonable and supportable information to form credit loss estimates. ASU 2016-13 is effective for "smaller reporting companies" (as defined by the Securities and Exchange Commission) for fiscal years beginning after December 15, 2022, including interim periods within those years, and must be adopted under a modified retrospective method approach. The Company intends to adopt ASU 2016-13 effective January 1, 2023 and is currently evaluating the provisions of this guidance and assessing the impact on its financial statements and disclosures. The Company does not believe this standard will have a material impact on its financial statements and disclosures.

Basis of Presentation (Tables)

Basis of Presentation (Tables)	6 Months Ended
	Jun. 30, 2022
Accounting Policies [Abstract]
Schedule of Earnings Per Share, Basic and Diluted	The following table sets forth the calculations of basic and diluted (loss) earnings per share: Three Months Ended June 30, Six Months Ended June 30, (in thousands, except per share amounts) 2022 2021 2022 2021 Net (loss) income $ (326) $ 16,590 $ (3,359) $ 30,327 Basic weighted-average common shares outstanding 18,473 18,271 18,409 18,219 Add: dilutive effect of equity instruments — 127 — 137 Diluted weighted-average shares outstanding 18,473 18,398 18,409 18,356 (Loss) earnings per share - basic $ (0.02) $ 0.91 $ (0.18) $ 1.66 (Loss) earnings per share - diluted $ (0.02) $ 0.90 $ (0.18) $ 1.65

Acquisition of Marshall Mine (T

Acquisition of Marshall Mine (Tables)	6 Months Ended
	Jun. 30, 2022
Business Combination and Asset Acquisition [Abstract]
Schedule of Assets and Liabilities	The following tables summarize the assets and liabilities of Marshall Mine, LLC and their classification in the Company's Condensed Consolidated Balance Sheets: As of (in thousands) June 30, 2022 December 31, 2021 Balance sheet component Cash $ 1,501 $ 914 Current assets Norit receivable, short-term — 2,056 Current assets Prepaid expenses and other current assets 249 — Current assets Restricted cash 10,000 10,027 Non-current assets Property and equipment, net 3 1,968 Non-current assets Norit receivable, long-term — 6,846 Non-current assets $ 11,753 $ 21,811 Accounts payable and accrued liabilities $ 447 $ 1,065 Current liabilities Asset retirement obligation, short-term 291 1,775 Current liabilities Asset retirement obligation, long-term 4,474 4,546 Non-current liabilities $ 5,212 $ 7,386

Leases (Tables)

Leases (Tables)	6 Months Ended
	Jun. 30, 2022
Leases [Abstract]
Lease, Cost	The Company's operating and finance lease right-of-use ("ROU") assets and liabilities as of June 30, 2022 and December 31, 2021 consisted of the following items (in thousands): As of Leases June 30, 2022 December 31, 2021 Operating Leases Operating lease right-of-use assets, net of accumulated amortization (1) $ 8,118 $ 6,000 Operating lease obligations, current $ 2,742 $ 2,157 Long-term operating lease obligations 5,592 4,178 Total operating lease obligation $ 8,334 $ 6,335 Finance Leases Finance lease right-of-use assets, net of accumulated amortization (2) $ 3,013 $ 1,743 Finance lease obligations, current $ 1,235 $ 1,011 Long-term finance lease obligations 3,998 3,152 Total finance lease obligations $ 5,233 $ 4,163 (1) Operating lease ROU assets are reported net of accumulated amortization of $2.9 million and $1.9 million as of June 30, 2022 and December 31, 2021, respectively. (2) Finance lease ROU assets are reported net of accumulated amortization of $1.5 million and $1.1 million as of June 30, 2022 and December 31, 2021, respectively. Lease financial information as of and for the three and six months ended June 30, 2022 and 2021 is provided in the following table: Three Months Ended June 30, Six Months Ended June 30, (in thousands) 2022 2021 2022 2021 Finance lease cost: Amortization of right-of-use assets $ 230 $ 174 $ 371 $ 348 Interest on lease liabilities 86 70 164 149 Operating lease cost 778 626 1,584 1,085 Short-term lease cost 216 233 459 800 Variable lease cost (1) 3 12 7 21 Total lease cost $ 1,313 $ 1,115 $ 2,585 $ 2,403 Other Information: Cash paid for amounts included in the measurement of lease liabilities: Operating cash flows for finance leases $ 164 $ 149 Operating cash flows for operating leases $ 1,419 $ 1,314 Financing cash flows for finance leases $ 594 $ 818 Right-of-use assets obtained in exchange for new finance lease liabilities $ 1,641 $ — Right-of-use assets obtained in exchange for new operating lease liabilities $ 3,418 $ 3,362 Weighted-average remaining lease term - finance leases 3.2 years 3.3 years Weighted-average remaining lease term - operating leases 4.3 years 2.9 years Weighted-average discount rate - finance leases 5.9 % 6.4 % Weighted-average discount rate - operating leases 5.9 % 7.8 % (1) Primarily includes common area maintenance, property taxes and insurance payable to lessors.

Revenues (Tables)

Revenues (Tables)	6 Months Ended
	Jun. 30, 2022
Revenue from Contract with Customer [Abstract]
Schedule of Accounts Receivable	The following table shows the components of the Company's Receivables, net: As of (in thousands) June 30, 2022 December 31, 2021 Trade receivables, net $ 12,589 $ 10,476 Other receivables 70 — Norit Receivable - current — 2,146 Receivables, net $ 12,659 $ 12,622

Inventories, net (Tables)

Inventories, net (Tables)	6 Months Ended
	Jun. 30, 2022
Inventory Disclosure [Abstract]
Schedule of Inventory	The following table summarizes the Company's inventories recorded at the lower of average cost or net realizable value as of June 30, 2022 and December 31, 2021: As of (in thousands) June 30, 2022 December 31, 2021 Product inventory, net $ 6,072 $ 4,901 Raw material inventory 6,037 2,949 $ 12,109 $ 7,850

Supplemental Financial Inform_2

Supplemental Financial Information (Tables)	6 Months Ended
	Jun. 30, 2022
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]
Schedule of Prepaid Expenses and Other Assets and Other assets	The following table summarizes the components of Other long-term assets, net as presented in the Condensed Consolidated Balance Sheets: As of (in thousands) June 30, December 31, Other long-term assets, net: Right of use assets, operating leases, net $ 8,118 $ 6,000 Upfront Customer Consideration 6,728 6,982 Mine development costs, net 5,461 5,330 Spare parts, net 4,710 4,598 Mine reclamation asset, net 1,691 1,742 Intangible assets, net 1,028 1,237 Equity method investments — 2,391 Other 1,839 1,745 Norit Receivable — 6,846 $ 29,575 $ 36,871
Schedule of Other Liabilities	The following table details the components of Other current liabilities and Other long-term liabilities as presented in the Condensed Consolidated Balance Sheets: As of (in thousands) June 30, December 31, Other current liabilities: Current portion of operating lease obligations $ 2,742 $ 2,157 Income and other taxes payable 1,173 807 Other 1,287 2,160 $ 5,202 $ 5,124 Other long-term liabilities: Mine reclamation liabilities $ 8,203 $ 8,184 Operating lease obligations, long-term 5,592 4,178 Other 867 — $ 14,662 $ 12,362
Schedule of Change in Asset Retirement Obligation	The Mine reclamation liability related to the Five Forks Mine is included in Other long-term liabilities. The Mine reclamation liability related to Marshall Mine is included in Other current liabilities and Other long-term liabilities. The Mine reclamation liabilities represent AROs and changes for the three and six months ended June 30, 2022 and year ended December 31, 2021 were as follows: As of (in thousands) June 30, 2022 December 31, 2021 Asset retirement obligations, beginning of period $ 9,959 $ 21,447 Accretion 308 1,102 Liabilities settled (1,807) (10,010) Changes due to scope and timing of reclamation (1) 34 (2,580) Asset retirement obligations, end of period 8,494 9,959 Less current portion 291 1,775 Asset retirement obligations, long-term $ 8,203 $ 8,184 (1) As of June 30, 2021 and December 31, 2021, the Company revised its estimate of future obligations owed for the reclamation of the Marshall Mine primarily based on scope reductions related to future reclamation requirements. As a result, the Company reduced the Marshall Mine ARO by $2.7 million and recorded a corresponding gain on change in estimate of $2.7 million for the year ended December 31, 2021.

Equity Method Investments (Tabl

Equity Method Investments (Tables)	6 Months Ended
	Jun. 30, 2022
Equity Method Investments and Joint Ventures [Abstract]
Schedule of Equity Method Investments	The following table summarizes the results of operations of Tinuum Group: Three Months Ended June 30, Six Months Ended June 30, (in thousands) 2022 2021 2022 2021 Gross profit $ — $ 8,820 $ 964 $ 11,495 Operating, selling, general and administrative expenses 1,051 12,429 4,248 26,231 Loss from operations (1,051) (3,609) (3,284) (14,736) Other income (expenses), net 27 3,150 528 4,003 (Income) loss attributable to noncontrolling interest (580) 29,038 (874) 64,616 Net (loss) income available to members $ (1,604) $ 28,579 $ (3,630) $ 53,883 ADES equity earnings from Tinuum Group $ 2,125 $ 19,125 $ 3,137 $ 35,487 The following tables present the Company's investment balance, equity earnings and cash distributions in excess of the investment balance, if any, for the three and six months ended June 30, 2022 and 2021 ( in thousands ): Description Date(s) Investment balance ADES equity earnings Cash distributions Memorandum Account: Cash distributions and equity earnings in (excess) of investment balance Beginning balance 12/31/2021 $ — $ — $ — $ (21,779) ADES proportionate share of net loss from Tinuum Group First Quarter (861) (861) — — Recovery of prior cash distributions in excess of investment balance (prior to cash distributions) First Quarter (21,779) (21,779) — 21,779 Cash distributions from Tinuum Group First Quarter (1,012) — 1,012 — Adjustment for current year cash distributions in excess of investment balance First Quarter 23,652 23,652 — (23,652) Total investment balance, equity earnings and cash distributions 3/31/2022 $ — $ 1,012 $ 1,012 $ (23,652) ADES proportionate share of net loss from Tinuum Group Second Quarter (682) $ (682) $ — — Recovery of prior cash distributions in excess of investment balance (prior to cash distributions) Second Quarter (23,652) (23,652) — 23,652 Cash distributions from Tinuum Group Second Quarter (2,125) — 2,125 — Adjustment for current year cash distributions in excess of investment balance Second Quarter 26,459 26,459 — (26,459) Total investment balance, equity earnings and cash distributions 6/30/2022 $ — $ 2,125 $ 2,125 $ (26,459) Description Date(s) Investment balance ADES equity earnings Cash distributions Memorandum Account: Cash distributions and equity earnings in (excess) of investment balance Beginning balance 12/31/2020 $ 3,387 $ — $ — $ — ADES proportionate share of net income from Tinuum Group First Quarter 10,755 10,755 — — Cash distributions from Tinuum Group First Quarter (19,749) — 19,749 — Adjustment for current year cash distributions in excess of investment balance First Quarter 5,607 5,607 — (5,607) Total investment balance, equity earnings and cash distributions 3/31/2021 $ — $ 16,362 $ 19,749 $ (5,607) ADES proportionate share of net income from Tinuum Group Second Quarter $ 12,146 $ 12,146 $ — $ — Recovery of prior cash distributions in excess of investment balance (prior to cash distributions) Second Quarter (5,607) (5,607) — 5,607 Cash distributions from Tinuum Group Second Quarter (19,125) — 19,125 — Adjustment for current year cash distributions in excess of investment balance Second Quarter 12,586 12,586 — (12,586) Total investment balance, equity earnings and cash distributions 6/30/2021 $ — $ 19,125 $ 19,125 $ (12,586) The following table summarizes the results of operations of Tinuum Services: Three Months Ended June 30, Six Months Ended June 30, (in thousands) 2022 2021 2022 2021 Gross profit (loss) $ 78 $ (22,641) $ 1,046 $ (41,163) Operating, selling, general and administrative expenses 172 47,355 2,717 101,722 Loss from operations (94) (69,996) (1,671) (142,885) Other income (expenses), net 263 32 1,157 (394) (Income) loss attributable to noncontrolling interest — 74,587 323 151,802 Net income (loss) $ 169 $ 4,623 $ (191) $ 8,523 ADES equity earnings from Tinuum Services $ 264 $ 2,312 $ 84 $ 4,262 The following tables present the Company's investment balance, equity earnings and cash distributions in excess of the investment balance, if any, for the three and six months ended June 30, 2022 ( in thousands ): Description Date(s) Investment balance ADES equity earnings Cash distributions Memorandum Account: Cash distributions and equity earnings in (excess) of investment balance Beginning balance 12/31/2021 $ 2,391 $ — $ — $ — ADES proportionate share of net loss from Tinuum Services First Quarter (180) (180) — — Cash distributions from Tinuum Services First Quarter (1,501) — 1,501 — Total investment balance, equity earnings and cash distributions 3/31/2022 $ 710 $ (180) $ 1,501 $ — ADES proportionate share of net income from Tinuum Services Second Quarter $ 85 $ 85 $ — $ — Cash distributions from Tinuum Services Second Quarter (974) — 974 — Adjustment for current year cash distributions in excess of investment balance Second Quarter 179 179 — (179) Total investment balance, equity earnings and cash distributions 6/30/2022 $ — $ 264 $ 974 $ (179) The following table details the carrying value of the Company's respective equity method investments included in the Equity method investments line item on the Condensed Consolidated Balance Sheets and indicates the Company's maximum exposure to loss: As of (in thousands) June 30, December 31, Equity method investment in Tinuum Services $ — $ 2,391 Total equity method investments $ — $ 2,391 The following table details the components of the Company's respective equity method investments included in the "Earnings from equity method investments" line item on the Condensed Consolidated Statements of Operations: Three Months Ended June 30, Six Months Ended June 30, (in thousands) 2022 2021 2022 2021 Earnings from Tinuum Group $ 2,125 $ 19,125 $ 3,137 $ 35,487 Earnings from Tinuum Services 264 2,312 84 4,262 Earnings from other — — 1 — Earnings from equity method investments $ 2,389 $ 21,437 $ 3,222 $ 39,749 The following table details the components of the cash distributions from the Company's respective equity method investments included as a component of cash flows from operating activities and investing activities in the Condensed Consolidated Statements of Cash Flows. Distributions from equity method investees are reported in the Condensed Consolidated Statements of Cash Flows as "Distributions from equity method investees, return on investment" as a component of cash flows from operations until such time as the carrying value in an equity method investee company is reduced to zero. Thereafter, such distributions are reported as "Distributions from equity method investees in excess of cumulative earnings" as a component of cash flows from investing activities. Six Months Ended June 30, (in thousands) 2022 2021 Distributions from equity method investees, return on investment Tinuum Services $ 2,297 $ 5,002 Tinuum Group — 14,142 $ 2,297 $ 19,144 Distributions from equity method investees in excess of investment basis Tinuum Group $ 3,137 $ 24,732 Tinuum Services 179 — $ 3,316 $ 24,732

Stock-Based Compensation (Table

Stock-Based Compensation (Tables)	6 Months Ended
	Jun. 30, 2022
Share-Based Payment Arrangement [Abstract]
Allocation of Compensation Expense	Total stock-based compensation expense for the three and six months ended June 30, 2022 and 2021 was as follows: Three Months Ended June 30, Six Months Ended June 30, (in thousands) 2022 2021 2022 2021 RSA expense $ 393 $ 511 $ 820 $ 918 PSU expense 91 55 128 69 Total stock-based compensation expense $ 484 $ 566 $ 948 $ 987
Schedule of Unrecognized Compensation Cost	The amount of unrecognized compensation cost as of June 30, 2022, and the expected weighted-average period over which the cost will be recognized is as follows: As of June 30, 2022 (in thousands, expect years) Unrecognized Compensation Cost Expected Weighted- RSA expense $ 3,051 2.20 PSU expense 735 1.82 Total unrecognized stock-based compensation expense $ 3,786 2.13
Summary of Restricted Stock Activity	A summary of RSA activity under the Company's various stock compensation plans for the six months ended June 30, 2022 is presented below: Restricted Stock Weighted-Average Grant Date Fair Value Non-vested at January 1, 2022 531,623 $ 5.94 Granted 336,079 $ 6.40 Vested (229,871) $ 6.54 Forfeited (41,974) $ 6.00 Non-vested at June 30, 2022 595,857 $ 5.95
Summary of Performance Shares Units	A summary of PSU activity for the six months ended June 30, 2022 is presented below: Units Weighted-Average Aggregate Intrinsic Value (in thousands) Weighted-Average PSU's outstanding, January 1, 2022 88,026 $ 6.65 Granted 60,565 9.59 Vested / Settled — — Forfeited / Canceled — — PSU's outstanding, June 30, 2022 148,591 $ 7.85 $ 697 1.82

Income Taxes (Tables)

Income Taxes (Tables)	6 Months Ended
	Jun. 30, 2022
Income Tax Disclosure [Abstract]
Schedule of Income Tax Expense and Effective Tax Rates	For the three and six months ended June 30, 2022 and 2021, the Company's income tax expense and effective tax rates were: Three Months Ended June 30, Six Months Ended June 30, (in thousands, except for rate) 2022 2021 2022 2021 Income tax expense $ — $ 4,943 $ — $ 9,432 Effective tax rate — % 23 % — % 24 %

Basis of Presentation - Calcula

Basis of Presentation - Calculations of Basic and Diluted Earnings per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended				6 Months Ended
	Jun. 30, 2022	Mar. 31, 2022	Jun. 30, 2021	Mar. 31, 2021	Jun. 30, 2022	Jun. 30, 2021
Accounting Policies [Abstract]
Net (loss) income	$ (326)	$ (3,033)	$ 16,590	$ 13,737	$ (3,359)	$ 30,327
Basic weighted-average common shares outstanding (in shares)	18,473		18,271		18,409	18,219
Add: dilutive effect of equity instruments (in shares)	0		127		0	137
Diluted weighted-average shares outstanding (in shares)	18,473		18,398		18,409	18,356
(Loss) earnings per share - basic (in dollars per share)	$ (0.02)		$ 0.91		$ (0.18)	$ 1.66
(Loss) earnings per share - diluted (in dollars per share)	$ (0.02)		$ 0.90		$ (0.18)	$ 1.65
Total shares excluded from diluted shares outstanding (in shares)	800		100		700	0

Basis of Presentation - Additio

Basis of Presentation - Additional Information (Details) $ in Thousands	6 Months Ended
	Jun. 30, 2022 USD ($) numberOfFinancialInstitutions numberOfSegments
Accounting Policies [Abstract]
Number of financial institutions | numberOfFinancialInstitutions	2
Time deposits, $250,000 or more | $	$ 250
Number of reportable segments | numberOfSegments	1

Customer Supply Agreement (Deta

Customer Supply Agreement (Details) - USD ($) $ in Millions			6 Months Ended
	Feb. 25, 2022	Sep. 30, 2020	Jun. 30, 2022
Additional Term of Contract [Abstract]
Term of contract		15 years
Additional term of contract		10 years
Period of termination notice		3 years
Reclamation reimbursements	$ 8.5	$ 10.2
Estimated credit risk		1.50%
Supply agreement, cash received	10.6
Reclamation costs	0.8
Reclamation reimbursement	9
Specific capital contributions	$ 1.3
Other Income (Expense)
Supply Commitment [Line Items]
Loss on reclamation reimbursement			$ 0.5

Acquisition of Marshall Mine -

Acquisition of Marshall Mine - Additional Information (Details) - USD ($) $ in Thousands			6 Months Ended
	Feb. 25, 2022	Sep. 30, 2020	Jun. 30, 2022	Dec. 31, 2021	Dec. 31, 2020
Business Acquisition [Line Items]
Reclamation reimbursements	$ 8,500	$ 10,200
Term of contract		15 years
Asset retirement obligation			$ 8,494	$ 9,959	$ 21,447
Amortization of upfront customer consideration			500
Marshall Mine
Business Acquisition [Line Items]
Asset retirement obligation			$ 4,800	$ 6,300
Marshall Mine
Business Acquisition [Line Items]
Membership interest		100%
Term of contract		15 years
Marshall Mine | Cabot
Business Acquisition [Line Items]
Reclamation reimbursements		$ 10,200
Term of contract		13 years

Acquisition of Marshall Mine _2

Acquisition of Marshall Mine - Assets and Liabilities (Details) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
ASSETS
Norit receivable, short-term	$ 0	$ 2,481
Prepaid expenses and other current assets	7,441	6,661
Property and equipment, net	31,149	30,171
Total Assets	183,752	185,436
Liabilities
Asset retirement obligation, short-term	291	1,775
Asset retirement obligation, long-term	8,203	8,184
Total Liabilities	39,247	38,135
Marshall Mine
ASSETS
Cash	1,501	914
Norit receivable, short-term	0	2,056
Prepaid expenses and other current assets	249	0
Restricted cash	10,000	10,027
Property and equipment, net	3	1,968
Norit receivable, long-term	0	6,846
Total Assets	11,753	21,811
Liabilities
Accounts payable and accrued liabilities	447	1,065
Asset retirement obligation, short-term	291	1,775
Asset retirement obligation, long-term	4,474	4,546
Total Liabilities	$ 5,212	$ 7,386

Leases - Balance Sheets (Detail

Leases - Balance Sheets (Details) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Operating Leases
Operating lease right-of-use assets, net of accumulated amortization	$ 8,118	$ 6,000
Operating lease obligations, current	2,742	2,157
Operating lease obligations, long-term	5,592	4,178
Total operating lease obligation	8,334	6,335
Finance Leases
Finance lease right-of-use assets, net of accumulated amortization	3,013	1,743
Finance lease obligations, current	1,235	1,011
Long-term finance lease obligations	3,998	3,152
Total finance lease obligations	5,233	4,163
Operating lease, accumulated amortization	2,900	1,900
Finance Lease, accumulated amortization	$ 1,500	$ 1,100

Leases - Narrative (Details)

Leases - Narrative (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021	Dec. 31, 2021
Lessee, Lease, Description [Line Items]
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration]	Other long-term assets, net		Other long-term assets, net		Other long-term assets, net
Operating Lease, Liability, Current, Statement of Financial Position [Extensible List]	Other current liabilities		Other current liabilities		Other current liabilities
Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List]	Other long-term liabilities		Other long-term liabilities		Other long-term liabilities
Operating lease, expense	$ 1	$ 0.9	$ 2	$ 1.9
General and Administrative Expense
Lessee, Lease, Description [Line Items]
Operating lease, expense	0.1	0.1	0.2	0.2
Consumables
Lessee, Lease, Description [Line Items]
Operating lease, expense	$ 0.9	$ 0.8	$ 1.8	$ 1.7

Leases - Lease Liabilities (Det

Leases - Lease Liabilities (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Lease, cost
Amortization of right-of-use assets	$ 230	$ 174	$ 371	$ 348
Interest on lease liabilities	86	70	164	149
Operating lease cost	778	626	1,584	1,085
Short-term lease cost	216	233	459	800
Variable lease cost	3	12	7	21
Total lease cost	$ 1,313	$ 1,115	2,585	2,403
Operating cash flows for finance leases			164	149
Operating cash flows for operating leases			1,419	1,314
Financing cash flows for finance leases			594	818
Right-of-use assets obtained in exchange for new finance lease liabilities			1,641	0
Right-of-use assets obtained in exchange for new operating lease liabilities			$ 3,418	$ 3,362
Weighted-average remaining lease term - finance leases	3 years 2 months 12 days	3 years 3 months 18 days	3 years 2 months 12 days	3 years 3 months 18 days
Weighted-average remaining lease term - operating leases	4 years 3 months 18 days	2 years 10 months 24 days	4 years 3 months 18 days	2 years 10 months 24 days
Weighted-average discount rate - finance leases	5.90%	6.40%	5.90%	6.40%
Weighted-average discount rate - operating leases	5.90%	7.80%	5.90%	7.80%

Revenues - Narrative (Details)

Revenues - Narrative (Details)	6 Months Ended
	Jun. 30, 2022
Revenue from Contract with Customer [Abstract]
Collection terms	Credit terms are generally net 30 from the date of invoice.

Revenues - Receivables (Details

Revenues - Receivables (Details) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Accounts, Notes, Loans and Financing Receivable [Line Items]
Other receivables	$ 70	$ 0
Receivables, net	12,659	12,622
Norit Litigation
Accounts, Notes, Loans and Financing Receivable [Line Items]
Receivables, net	0	2,146
Trade Accounts Receivable
Accounts, Notes, Loans and Financing Receivable [Line Items]
Receivables, net	$ 12,589	$ 10,476

Revenues - Disaggregation of Re

Revenues - Disaggregation of Revenue (Details)	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Revenue from Contract with Customer Benchmark | Geographic Concentration Risk | Canada
Disaggregation of Revenue [Line Items]
Percent of revenue generated	8%	10%	9%	15%

Inventories, net (Details)

Inventories, net (Details) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Inventory Disclosure [Abstract]
Product inventory, net	$ 6,072	$ 4,901
Raw material inventory	6,037	2,949
Inventories	$ 12,109	$ 7,850

Commitments and Contingencies (

Commitments and Contingencies (Details)	May 04, 2022	Jun. 30, 2022 USD ($) entity	Dec. 31, 2021 USD ($)	Jun. 07, 2021 USD ($)
Commitments and Contingencies Disclosure [Abstract]
Surety bond amount		$ 7,500,000	$ 7,500,000	$ 16,600,000
Restricted cash, long-term		10,000,000	$ 10,027,000
Other Commitments [Line Items]
Employee-related liabilities		$ 2,500,000
Plan | In August 2022
Other Commitments [Line Items]
Retention Agreements, Percent Of Retention Pay	40%
Plan | Employment Date or Transaction Date
Other Commitments [Line Items]
Retention Agreements, Percent Of Retention Pay	60%
Retention Agreements, Benchmark Period	90 days
Plan | Additional Lump Sum Payment
Other Commitments [Line Items]
Retention Agreements, Benchmark Period	90 days
Plan | Additional Lump Sum Payment | Minimum
Other Commitments [Line Items]
Retention Agreements, Percent Of Retention Pay	10%
Plan | Additional Lump Sum Payment | Maximum
Other Commitments [Line Items]
Retention Agreements, Percent Of Retention Pay	40%
Tinuum Group, LLC
Related Party Transaction [Line Items]
Number of entities affiliated with related parties | entity		2
Limited guarantees, percent		50%
Liabilities or expense		$ 0

Supplemental Financial Inform_3

Supplemental Financial Information - Prepaid expenses and other assets and Other assets (Details) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Other long-term assets, net:
Right of use assets, operating leases, net	$ 8,118	$ 6,000
Upfront Customer Consideration	6,728	6,982
Mine development costs, net	5,461	5,330
Spare parts, net	4,710	4,598
Mine reclamation asset, net	1,691	1,742
Intangible assets, net	1,028	1,237
Equity method investments	0	2,391
Other	1,839	1,745
Norit Receivable	0	6,846
Total	$ 29,575	$ 36,871

Supplemental Financial Inform_4

Supplemental Financial Information - Narrative (Details) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Related Party Transaction [Line Items]
Equity method investments	$ 0	$ 2,391
Highview Enterprises Limited
Related Party Transaction [Line Items]
Equity method investments	$ 600	$ 600

Supplemental Financial Inform_5

Supplemental Financial Information - Other Liabilities (Details) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Other current liabilities:
Current portion of operating lease obligations	$ 2,742	$ 2,157
Income and other taxes payable	1,173	807
Other	1,287	2,160
Other current liabilities	5,202	5,124
Other long-term liabilities:
Mine reclamation liabilities	$ 8,203	$ 8,184
Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List]	Other long-term liabilities	Other long-term liabilities
Operating lease obligations, long-term	$ 5,592	$ 4,178
Other	867	0
Other long-term liabilities	$ 14,662	$ 12,362

Supplemental Financial Inform_6

Supplemental Financial Information - Asset Retirement Obligation (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021	Dec. 31, 2021
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]
Asset retirement obligation, beginning of period			$ 9,959	$ 21,447	$ 21,447
Accretion			308		1,102
Liabilities settled			(1,807)		(10,010)
Changes due to amount and timing of reclamation			34		(2,580)
Asset retirement obligations, end of period	$ 8,494		8,494		9,959
Less current portion	291		291		1,775
Asset retirement obligations, long-term	8,203		8,203		8,184
Property, Plant and Equipment [Line Items]
Loss (gain) on change in estimate, asset retirement obligation	34	$ (1,942)	34	$ (1,942)	2,700
Marshall Mine
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]
Asset retirement obligation, beginning of period			6,300
Asset retirement obligations, end of period	$ 4,800		$ 4,800		6,300
Property, Plant and Equipment [Line Items]
Loss (gain) on change in estimate, asset retirement obligation					$ 2,700

Equity Method Investments - Nar

Equity Method Investments - Narrative (Details) - USD ($) $ in Thousands	Jun. 30, 2022	Mar. 31, 2022	Dec. 31, 2021	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2020
Schedule of Equity Method Investments [Line Items]
Equity method investments	$ 0		$ 2,391
Tinuum Group, LLC
Schedule of Equity Method Investments [Line Items]
Ownership interest, percent	42.50%		42.50%
Equity method investments	$ 0	$ 0	$ 0	$ 0	$ 0	$ 3,387
Tinuum Services, LLC
Schedule of Equity Method Investments [Line Items]
Ownership interest, percent	50%		50%
Equity method investments	$ 0	$ 710	$ 2,391

Equity Method Investments - Res

Equity Method Investments - Results of Operations and Summary of Distributions (Details) - USD ($) $ in Thousands	3 Months Ended				6 Months Ended
	Jun. 30, 2022	Mar. 31, 2022	Jun. 30, 2021	Mar. 31, 2021	Jun. 30, 2022	Jun. 30, 2021	Dec. 31, 2021	Dec. 31, 2020
Equity Method Investment, Financial Statement, Reported Amounts [Abstract]
Operating, selling, general and administrative expenses	$ 27,475		$ 20,626		$ 57,212	$ 42,903
Net (loss) income	(326)	$ (3,033)	16,590	$ 13,737	(3,359)	30,327
ADES equity earnings	2,389		21,437		3,222	39,749
Equity method investments	0				0		$ 2,391
Distributions from equity method investees, return on investment					2,297	19,144
Distributions from equity method investees in excess of investment basis					3,316	24,732
Tinuum Group, LLC
Equity Method Investment, Financial Statement, Reported Amounts [Abstract]
ADES equity earnings	2,125		19,125		3,137	35,487
Equity method investments	0	0	0	$ 0	0	0	0	$ 3,387
Distributions from equity method investees, return on investment					0	14,142
Distributions from equity method investees in excess of investment basis					3,137	24,732
Tinuum Services, LLC
Equity Method Investment, Financial Statement, Reported Amounts [Abstract]
Operating, selling, general and administrative expenses	172		47,355		2,717	101,722
Loss from operations	(94)		(69,996)		(1,671)	(142,885)
Other income (expenses), net	263		32		1,157	(394)
(Income) loss attributable to noncontrolling interest	0		74,587		323	151,802
Net (loss) income	169		4,623		(191)	8,523
ADES equity earnings	264		2,312		84	4,262
Equity method investments	0	$ 710			0		$ 2,391
Distributions from equity method investees, return on investment					2,297	5,002
Distributions from equity method investees in excess of investment basis					179	0
Earnings from other
Equity Method Investment, Financial Statement, Reported Amounts [Abstract]
ADES equity earnings	0		0		1	0
Tinuum Group, LLC
Equity Method Investment, Financial Statement, Reported Amounts [Abstract]
Gross profit (loss)	0		8,820		964	11,495
Operating, selling, general and administrative expenses	1,051		12,429		4,248	26,231
Loss from operations	(1,051)		(3,609)		(3,284)	(14,736)
Other income (expenses), net	27		3,150		528	4,003
(Income) loss attributable to noncontrolling interest	(580)		29,038		(874)	64,616
Net (loss) income	(1,604)		28,579		(3,630)	53,883
Tinuum Services, LLC
Equity Method Investment, Financial Statement, Reported Amounts [Abstract]
Gross profit (loss)	$ 78		$ (22,641)		$ 1,046	$ (41,163)

Equity Method Investments - Rol

Equity Method Investments - Rollforward of CCS Investment (Details) - USD ($) $ in Thousands	3 Months Ended
	Jun. 30, 2022	Mar. 31, 2022	Jun. 30, 2021	Mar. 31, 2021
Equity Method Investments [Roll Forward]
Beginning balance		$ 2,391
Total investment balance, equity earnings and cash distributions	$ 0
Tinuum Group, LLC
Equity Method Investments [Roll Forward]
Beginning balance	0	0	$ 0	$ 3,387
ADES proportionate share of net income (loss) from Tinuum Services	(682)	(861)	12,146	10,755
Recovery of prior cash distributions in excess of investment balance (prior to cash distributions)	23,652	21,779	5,607
Cash distributions from Tinuum Services	2,125	1,012	19,125	19,749
Adjustment for current year cash distributions in excess of investment balance	26,459	23,652	12,586	5,607
Total investment balance, equity earnings and cash distributions	0	0	0	0
Tinuum Group, LLC | ADES equity earnings
Equity Method Investments [Roll Forward]
Beginning balance	1,012	0	16,362	0
ADES proportionate share of net income (loss) from Tinuum Services	(682)	(861)	12,146	10,755
Recovery of prior cash distributions in excess of investment balance (prior to cash distributions)	23,652	21,779	5,607
Cash distributions from Tinuum Services	0	0	0	0
Adjustment for current year cash distributions in excess of investment balance	26,459	23,652	12,586	5,607
Total investment balance, equity earnings and cash distributions	2,125	1,012	19,125	16,362
Tinuum Group, LLC | Cash distributions
Equity Method Investments [Roll Forward]
Beginning balance	1,012	0	19,749	0
ADES proportionate share of net income (loss) from Tinuum Services	0	0	0	0
Recovery of prior cash distributions in excess of investment balance (prior to cash distributions)	0	0	0
Cash distributions from Tinuum Services	2,125	1,012	19,125	19,749
Adjustment for current year cash distributions in excess of investment balance	0	0	0	0
Total investment balance, equity earnings and cash distributions	2,125	1,012	19,125	19,749
Tinuum Group, LLC | Memorandum Account: Cash distributions and equity loss in (excess) of investment balance
Equity Method Investments [Roll Forward]
Beginning balance	23,652	21,779	5,607	0
ADES proportionate share of net income (loss) from Tinuum Services	0	0	0	0
Recovery of prior cash distributions in excess of investment balance (prior to cash distributions)	23,652	21,779	5,607
Cash distributions from Tinuum Services	0	0	0	0
Adjustment for current year cash distributions in excess of investment balance	(26,459)	23,652	(12,586)	5,607
Total investment balance, equity earnings and cash distributions	26,459	23,652	$ 12,586	$ 5,607
Tinuum Services, LLC
Equity Method Investments [Roll Forward]
Beginning balance	710	2,391
ADES proportionate share of net income (loss) from Tinuum Services	85	(180)
Cash distributions from Tinuum Services	974	1,501
Adjustment for current year cash distributions in excess of investment balance	179
Total investment balance, equity earnings and cash distributions	0	710
Tinuum Services, LLC | ADES equity earnings
Equity Method Investments [Roll Forward]
Beginning balance	(180)	0
ADES proportionate share of net income (loss) from Tinuum Services	85	(180)
Cash distributions from Tinuum Services	0	0
Adjustment for current year cash distributions in excess of investment balance	179
Total investment balance, equity earnings and cash distributions	264	(180)
Tinuum Services, LLC | Cash distributions
Equity Method Investments [Roll Forward]
Beginning balance	1,501	0
ADES proportionate share of net income (loss) from Tinuum Services	0	0
Cash distributions from Tinuum Services	974	1,501
Adjustment for current year cash distributions in excess of investment balance	0
Total investment balance, equity earnings and cash distributions	974	1,501
Tinuum Services, LLC | Memorandum Account: Cash distributions and equity loss in (excess) of investment balance
Equity Method Investments [Roll Forward]
Beginning balance	0	0
ADES proportionate share of net income (loss) from Tinuum Services	0	0
Cash distributions from Tinuum Services	0	0
Adjustment for current year cash distributions in excess of investment balance	(179)
Total investment balance, equity earnings and cash distributions	$ 179	$ 0

Stockholders' Equity (Details)

Stockholders' Equity (Details) - USD ($)	Jun. 30, 2022	Nov. 30, 2019	Nov. 30, 2018	May 05, 2017
Maximum
Class of Stock [Line Items]
Requirement to own shares outstanding as percent				4.99%
Common Stock
Class of Stock [Line Items]
Authorized incremental amount		$ 7,100,000
Remaining authorized amount	$ 7,000,000
Common Stock | Maximum
Class of Stock [Line Items]
Authorized amount			$ 20,000,000

Stock-Based Compensation - Allo

Stock-Based Compensation - Allocation of Compensation Expense (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation expense	$ 484	$ 566	$ 948	$ 987
Restricted stock awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation expense	393	511	820	918
Performance share units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation expense	$ 91	$ 55	$ 128	$ 69

Stock-Based Compensation - Summ

Stock-Based Compensation - Summary of Unrecognized Compensation Cost (Details) $ in Thousands	6 Months Ended
	Jun. 30, 2022 USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized Compensation Cost	$ 3,786
Expected Weighted-Average Period of Recognition (in years)	2 years 1 month 17 days
Restricted stock awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized Compensation Cost	$ 3,051
Expected Weighted-Average Period of Recognition (in years)	2 years 2 months 12 days
Restricted stock units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized Compensation Cost	$ 735
Expected Weighted-Average Period of Recognition (in years)	1 year 9 months 25 days

Stock-Based Compensation - Narr

Stock-Based Compensation - Narrative (Details)	6 Months Ended
	Jun. 30, 2022
Restricted stock awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	3 years

Stock-Based Compensation - Su_2

Stock-Based Compensation - Summary of Non-vested Restricted Stock Activity (Details) - Restricted stock awards	6 Months Ended
	Jun. 30, 2022 $ / shares shares
Number of SAR's Outstanding and Exercisable
Non-vested shares, Beginning balance (in shares) | shares	531,623
Granted (in shares) | shares	336,079
Vested (in shares) | shares	(229,871)
Forfeited (in shares) | shares	(41,974)
Non-vested shares, Ending balance (in shares) | shares	595,857
Units
Non-vested shares, Weighted-Average Grant Date Fair Value, Beginning Balance (in dollars per share) | $ / shares	$ 5.94
Granted, Weighted-Average Grant Date Fair Value (in dollars per share) | $ / shares	6.40
Vested in period, Weighted-Average Grant Date Fair Value (in dollars per share) | $ / shares	6.54
Forfeited, Weighted-Average Grant Date Fair Value (in dollars per share) | $ / shares	6
Non-vested shares, Weighted-Average Grant Date Fair Value, Ending Balance (in dollars per share) | $ / shares	$ 5.95

Stock-Based Compensation - Su_3

Stock-Based Compensation - Summary of Non-vested PSUs (Details) - Performance share units $ / shares in Units, $ in Thousands	6 Months Ended
	Jun. 30, 2022 USD ($) $ / shares shares
Number of SAR's Outstanding and Exercisable
Non-vested shares, Beginning balance (in shares) | shares	88,026
Granted (in shares) | shares	60,565
Vested / Settled (in shares) | shares	0
Forfeited / Canceled (in shares) | shares	0
Non-vested shares, Ending balance (in shares) | shares	148,591
Units
Non-vested shares, Weighted-Average Grant Date Fair Value, Beginning Balance (in dollars per share) | $ / shares	$ 6.65
Granted, Weighted-Average Grant Date Fair Value (in dollars per share) | $ / shares	9.59
Vested / Settled in period, Weighted-Average Grant Date Fair Value (in dollars per share) | $ / shares	0
Forfeited, Weighted-Average Grant Date Fair Value (in dollars per share) | $ / shares	0
Non-vested shares, Weighted-Average Grant Date Fair Value, Ending Balance (in dollars per share) | $ / shares	$ 7.85
Outstanding, Aggregate Intrinsic Value | $	$ 697
Outstanding, Weighted Average Remaining Contractual Term (in years)	1 year 9 months 25 days

Income Taxes (Details)

Income Taxes (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Income Tax Disclosure [Abstract]
Income tax expense	$ 0	$ 4,943	$ 0	$ 9,432
Effective tax rate	0%	23%	0%	24%