Charah Solutions, Inc. 8.50% Se (CHRB) 10-Q 12 May 21 2021 Q1 Quarterly report Financial data

Cover

Cover - shares	3 Months Ended
	Mar. 31, 2021	May 01, 2021
Cover [Abstract]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Mar. 31, 2021
Document Transition Report	false
Entity File Number	001-38523
Entity Registrant Name	CHARAH SOLUTIONS, INC
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	82-4228671
Entity Address, Address Line One	12601 Plantside Drive
Entity Address, City or Town	Louisville
Entity Address, State or Province	KY
Entity Address, Postal Zip Code	40299
City Area Code	502
Local Phone Number	245-1353
Title of 12(b) Security	Common Stock, par value $0.01 per share
Trading Symbol	CHRA
Security Exchange Name	NYSE
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Non-accelerated Filer
Entity Small Business	true
Entity Emerging Growth Company	true
Entity Ex Transition Period	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		30,428,193
Entity Central Index Key	0001730346
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2021
Document Fiscal Period Focus	Q1
Amendment Flag	false

Condensed Consolidated Balance

Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Current assets:
Cash	$ 24,429	$ 24,787
Restricted cash	47,909	4,424
Trade accounts receivable, net	39,526	46,609
Receivable from affiliates	0	182
Contract assets	18,920	18,329
Inventory	6,790	5,917
Income tax receivable	29	260
Prepaid expenses and other current assets	6,020	5,287
Total current assets	143,623	105,795
Property and equipment, net	61,189	49,470
Goodwill	62,193	62,193
Intangible assets, net	64,648	61,426
Equity method investments	40	831
Other assets	6,969	1,245
Non-current assets held for sale	356	0
Total assets	339,018	280,960
Current liabilities:
Accounts payable	15,137	15,613
Payables to affiliates	2	0
Contract liabilities	30,796	6,295
Capital lease obligations, current portion	2,483	2,199
Notes payable, current maturities	22,896	22,308
Asset retirement obligation, current portion	18,729	2,043
Accrued liabilities	15,961	34,937
Other current liabilities	815	935
Total current liabilities	106,819	84,330
Long-term liabilities:
Deferred tax liabilities	525	368
Contingent payments for acquisitions	1,950	1,950
Asset retirement obligation	35,383	3,116
Line of credit	19,085	12,003
Capital lease obligations, less current portion	4,487	4,485
Notes payable, less current maturities	120,811	124,969
Other liabilities	3,845	2,000
Total liabilities	292,905	233,221
Commitments and contingencies
Mezzanine equity
Series A Preferred Stock — $0.01 par value; 50 shares authorized, 26 shares issued and outstanding as of March 31, 2021 and December 31, 2020; aggregate liquidation preference of $29,719 and $28,783 as of March 31, 2021 and December 31, 2020, respectively	28,926	27,423
Stockholders’ equity
Retained losses	(90,152)	(88,865)
Common Stock — $0.01 par value; 200,000 shares authorized, 30,228 and 30,077 shares issued and outstanding as of March 31, 2021 and December 31, 2020, respectively	302	300
Additional paid-in capital	106,552	108,471
Total stockholders’ equity	16,702	19,906
Non-controlling interest	485	410
Total equity	17,187	20,316
Total liabilities, mezzanine equity and stockholders’ equity	$ 339,018	$ 280,960

Condensed Consolidated Balanc_2

Condensed Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Statement of Financial Position [Abstract]
Series A Preferred Stock, par value (in dollars per share)	$ 0.01	$ 0.01
Series A Preferred Stock, shares authorized (in shares)	50,000	50,000
Series A Preferred Stock, shares issued (in shares)	26,000	26,000
Series A Preferred Stock, shares outstanding (in shares)	26,000	26,000
Series A Preferred Stock, aggregate liquidation preference	$ 29,719	$ 28,783
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized (in shares)	200,000,000	200,000,000
Common stock, shares issued (in shares)	30,228,000	30,077,000
Common stock, shares outstanding (in shares)	30,228,000	30,077,000

Condensed Consolidated Statemen

Condensed Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Income Statement [Abstract]
Revenue	$ 52,107	$ 51,277
Cost of sales	46,522	46,382
Gross profit	5,585	4,895
General and administrative expenses	9,432	10,668
Gain on sales-type lease	5,568	0
Gains and losses on sale of fixed assets and other operating income from ERT services	547	0
Other operating expenses from ERT services	290	0
Operating income (loss)	1,978	(5,773)
Interest expense, net	(3,235)	(2,859)
Loss on extinguishment of debt	0	(8,603)
Income from equity method investment	202	296
Loss from continuing operations before income taxes	(1,055)	(16,939)
Income tax expense	157	0
Net loss from continuing operations, net of tax	(1,212)	(16,939)
Income from discontinued operations, net of tax	0	3,043
Net loss	(1,212)	(13,896)
Less income attributable to non-controlling interest	75	354
Net loss attributable to Charah Solutions, Inc.	(1,287)	(14,250)
Amounts attributable to Charah Solutions, Inc.
Loss from continuing operations, net of tax and non-controlling interest	(1,287)	(17,293)
Deemed and imputed dividends on Series A Preferred Stock	(147)	0
Series A Preferred Stock dividends	(2,067)	(111)
Net loss from continuing operations attributable to common stockholders	(3,501)	(17,404)
Income from discontinued operations, net of tax	0	3,043
Net loss attributable to common stockholders	$ (3,501)	$ (14,361)
Net loss from continuing operations per common share:
Basic (in dollars per share)	$ (0.12)	$ (0.59)
Diluted (in dollars per share)	(0.12)	(0.59)
Net income from discontinued operations per common share:
Basic (in dollars per share)	0	0.10
Diluted (in dollars per share)	0	0.10
Net loss attributable to common stockholders per common share:
Basic (in dollars per share)	(0.12)	(0.48)
Diluted (in dollars per share)	$ (0.12)	$ (0.48)
Weighted-average shares outstanding used in income (loss) per common share:
Basic (in shares)	30,113	29,644
Diluted (in shares)	30,113	29,644

Condensed Consolidated Statem_2

Condensed Consolidated Statements of Stockholders' Equity - USD ($) $ in Thousands	Total	Total	Common Stock	Additional Paid-In Capital	Retained Losses	Non-Controlling Interest
Beginning balance (in shares) at Dec. 31, 2019	0
Beginning balance at Dec. 31, 2019	$ 0
Mezzanine Equity
Issuance of Series A Preferred Stock, net of issuance costs (in shares)	26,000
Issuance of Series A Preferred Stock, net of issuance costs	$ 23,513
Ending balance (in shares) at Mar. 31, 2020	26,000
Ending balance at Mar. 31, 2020	$ 23,513
Balance beginning of period (in shares) at Dec. 31, 2019			29,622,835
Balance beginning of period at Dec. 31, 2019	53,273	$ 52,481	$ 296	$ 85,187	$ (33,002)	$ 792
Permanent Equity
Net (loss) income	(13,896)	(14,250)			(14,250)	354
Distributions	(578)					(578)
Share-based compensation expense	732	732		732
Taxes paid related to net settlement of shares (in shares)			(5,953)
Taxes paid related to net settlement of shares	(14)	(14)		(14)
Issuance of Series A Preferred Stock, net of issuance costs	0
Series A Preferred Stock dividends	(111)	(111)		(111)
Balance end of period (in shares) at Mar. 31, 2020			29,616,882
Balance end of period at Mar. 31, 2020	$ 39,406	38,838	$ 296	85,794	(47,252)	568
Beginning balance (in shares) at Dec. 31, 2020	26,000
Beginning balance at Dec. 31, 2020	$ 27,423
Mezzanine Equity
Deemed and imputed dividends on Series A Preferred Stock	$ 1,503
Ending balance (in shares) at Mar. 31, 2021	26,000
Ending balance at Mar. 31, 2021	$ 28,926
Balance beginning of period (in shares) at Dec. 31, 2020	30,077,000		30,077,018
Balance beginning of period at Dec. 31, 2020	$ 20,316	19,906	$ 300	108,471	(88,865)	410
Permanent Equity
Net (loss) income	(1,212)	(1,287)			(1,287)	75
Share-based compensation expense	298	298		298
Shares issued under share-based compensation plans (in shares)			152,337
Shares issued under share-based compensation plans	0		$ 2	(2)
Taxes paid related to net settlement of shares (in shares)			(970)
Taxes paid related to net settlement of shares	(1)	(1)		(1)
Deemed and imputed dividends on Series A Preferred Stock	(147)	(147)		(147)
Series A Preferred Stock dividends	$ (2,067)	(2,067)		(2,067)
Balance end of period (in shares) at Mar. 31, 2021	30,228,000		30,228,385
Balance end of period at Mar. 31, 2021	$ 17,187	$ 16,702	$ 302	$ 106,552	$ (90,152)	$ 485

Condensed Consolidated Statem_3

Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Cash flows from operating activities:
Net loss	$ (1,212)	$ (13,896)
Adjustments to reconcile net loss to net cash provided by (used in) operating activities:
Depreciation and amortization	6,146	6,524
Loss on extinguishment of debt	0	8,603
Paid-in-kind interest on long-term debt	1,230	237
Amortization of debt issuance costs	165	0
Deferred income taxes	157	0
Gain on sales-type lease	(5,568)	0
(Gain) loss on sale of fixed assets	(644)	54
Income from equity method investment	(202)	(296)
Distributions received from equity investment	0	593
Non-cash shared-based compensation	298	732
(Gain) loss on interest rate swap	(120)	64
Interest accreted on contingent payments for acquisition	0	57
Increase (decrease) in cash due to changes in:
Trade accounts receivable	9,297	(28,320)
Contract assets and liabilities	23,910	(6,672)
Inventory	(873)	2,724
Accounts payable	(475)	(6,379)
Asset retirement obligation	(1,637)	(2,143)
Other assets and liabilities	(16,406)	19,798
Net cash provided by (used in) operating activities	14,066	(18,320)
Cash flows from investing activities:
Proceeds from the sale of equipment	446	14
Purchases of property and equipment	(1,534)	(1,184)
Cash and restricted cash received from ERT transaction	34,900	0
Payments of working capital adjustment and other items for the sale of subsidiary	(7,321)	0
Distributions received from equity method investment	993	0
Net cash provided by (used in) investing activities	27,484	(1,170)
Cash flows from financing activities:
Proceeds from the line of credit	7,082	8,000
Proceeds from long-term debt	1,009	15,000
Principal payments on long-term debt	(5,975)	(5,095)
Payments of debt issuance costs	0	(935)
Principal payments on capital lease obligations	(536)	0
Taxes paid related to net settlement of shares	(3)	(14)
Net proceeds from issuance of convertible Series A Preferred Stock	0	24,509
Distributions to non-controlling interest	0	(578)
Net cash provided by financing activities	1,577	40,887
Net increase in cash, cash equivalents and restricted cash	43,127	21,397
Cash, cash equivalents and restricted cash, beginning of period	29,211	6,128
Cash, cash equivalents and restricted cash, end of period	72,338	27,525
Supplemental disclosures of cash flow information:
Cash paid during the period for interest	2,002	3,352
Cash (refunded) paid during the period for taxes	(210)	780
Supplemental disclosures and non-cash investing and financing transactions:
Gross proceeds from the line of credit	37,480	44,454
Gross payments on the line of credit	(30,398)	(36,454)
Sale of structural fill asset through a sales-type lease	6,000	0
Proceeds from the sale of equipment in accounts receivable, net	728	0
Deemed and imputed dividends on Series A Preferred Stock	1,503	0
Equipment acquired through capital leases	822	0
Changes in property and equipment included in accounts payables and accrued expenses	205	676
Sale of equipment through the issuance of a note receivable	0	1,450
Total cash and cash equivalents	$ 72,338	$ 27,525

Nature of Business and Basis of

Nature of Business and Basis of Presentation	3 Months Ended
	Mar. 31, 2021
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Nature of Business and Basis of Presentation	Nature of Business and Basis of Presentation Organization Charah Solutions, Inc. and subsidiaries (“Charah Solutions,” the “Company,” “we,” “us,” or “our”) was formed as a Delaware corporation in January 2018 and did not conduct any material business operations before the transactions described below other than certain activities related to its initial public offering, which was completed on June 18, 2018 (the “IPO”). Charah Solutions is a holding company, the sole material assets of which consist of membership interests in Charah Management LLC, a Delaware limited liability company (“Charah Management”). Through the Company’s ownership of Charah Management, the Company owns the outstanding equity interests in Charah, LLC, a Kentucky limited liability company (“Charah”), the subsidiary through which Charah Solutions operates its businesses. Description of Business Operations The Company is a leading national service provider of mission-critical environmental services and byproduct sales to the power generation industry, enabling our customers to address challenges related to the remediation of coal ash ponds and landfills at open and closed power plant sites while continuously operating and providing necessary electric power to communities nationwide. Services offered include a suite of remediation and compliance services, byproduct sales and marketing, fossil services and environmental risk transfer (“ERT”) services. The Company has corporate offices in Kentucky and North Carolina and principally operates in the eastern and mid-central United States. Under the Jumpstart Our Business Startups Act (the “JOBS Act”), the Company meets the definition of an “emerging growth company,” which allows the Company to have an extended transition period for complying with new or revised accounting standards pursuant to Section 107(b) of the JOBS Act. The Company intends to take advantage of all of the reduced reporting requirements and exemptions, including the longer phase-in periods for the adoption of new or revised financial accounting standards under Section 107 of the JOBS Act until the Company is no longer an emerging growth company. Among other things, we are not required to provide an auditor attestation report on the assessment of the internal control over financial reporting under Section 404(b) of the Sarbanes-Oxley Act of 2002 and our disclosure obligations regarding executive compensation may be reduced. We may take advantage of these provisions until the last day of our fiscal year following the fifth anniversary of the IPO or December 31, 2023. However, if certain events occur before the end of such five-year period, including if we become a “large accelerated filer,” our annual gross revenue exceeds $1.07 billion, or we issue more than $1.0 billion of non-convertible debt in any three-year period, we will cease to be an emerging growth company before the end of such five-year period. Basis for Presentation The Company’s fiscal year ends December 31. The accompanying unaudited condensed consolidated financial statements include the assets, liabilities, stockholders’ equity and results of operations of the Company and its consolidated subsidiaries. Intercompany transactions and balances have been eliminated in consolidation. The accompanying unaudited condensed consolidated financial statements have been prepared in accordance with rules and regulations of the Securities and Exchange Commission for quarterly reports on Form 10-Q. In the opinion of management, all adjustments considered necessary for a fair presentation have been included, which consist of normal recurring adjustments. Certain information and footnote disclosures normally included in the annual financial statements prepared in accordance with U.S. generally accepted accounting principles (“GAAP”) have been condensed or omitted. The accompanying unaudited condensed consolidated financial statements should be read in conjunction with the audited consolidated and combined financial statements and notes thereto included in our Annual Report on Form 10-K for the year ended December 31, 2020. Discontinued Operations On November 19, 2020, the Company sold its Allied subsidiary engaged in maintenance, modification and repair services to the nuclear and fossil power generation industry to an affiliate of BCP (the “Purchaser”), the Company’s majority shareholder, in an all-cash deal for $40,000 (the “Allied Transaction”), subject to adjustments for working capital and certain other adjustments as set forth in the purchase agreement (the "Purchase Agreement"). Discontinued operations comprise those activities that were disposed of during 2020 and represent a separate major line of business that can be clearly distinguished for operational and financial reporting purposes. Accordingly, the Consolidated Balance Sheets, Statements of Operations, and the notes to consolidated financial statements reflect the Allied results as discontinued operations for all 2020 periods presented. Unless otherwise specified, disclosures in these condensed consolidated financial statements reflect continuing operations only. The consolidated statements of cash flows for the three months ended March 31, 2021 include both continuing and discontinued operations. Refer to Note 4, Discontinued Operations, for further information on the discontinued operations relating to the Allied Transaction. Segment Information The Company had two reporting units, two operating segments and two reportable segments in 2019 and in 2020 through the date of the Allied Transaction, Environmental Solutions (“ES”) and Maintenance and Technical Services (“M&TS”). The Company determined that it had two reporting units because of the way the reporting units were managed. After the Allied Transaction, the Company realigned our segment reporting into a single operating segment to reflect the suite of end-to-end services we offer our utility partners and how our Chief Operating Decision Maker (“CODM”) reviews consolidated financial information to evaluate results of operations, assess performance and allocate resources. Due to the nature of the Company’s business, the Company's Chief Executive Officer who is also the CODM, evaluates the performance of the Company and allocates resources of the Company based on consolidated gross profit, general and administrative expenses, balance sheet, liquidity, capital spending, safety statistics and business development reports for the Company as a whole. Since the Company has a single operating segment, all required financial segment information can be found in the consolidated financial statements. The prior period results in the accompanying unaudited condensed consolidated statements of operations were reclassified to conform to this presentation. We provide the following services through our one segment: remediation and compliance services, byproduct sales, fossil services and ERT services. Remediation and compliance services are associated with our customers’ need for multi-year environmental improvement and sustainability initiatives, whether driven by regulatory requirements, power generation customer initiatives or consumer expectations and standards. Byproduct sales support both our power generation customers’ desire to recycle their recurring and legacy volumes of coal combustion residuals (“CCRs”), commonly known as coal ash, and our ultimate end customers’ need for high-quality, cost-effective raw material substitutes. Fossil services consist of recurring and mission-critical coal ash management and operations for coal-fired power generation facilities. ERT services represent an innovative solution designed to meet the evolving and increasingly complex needs of utility customers. These customers need to retire and decommission older or underutilized assets while maximizing the asset's value and improving the environment. Our ERT services manage the sites' environmental remediation requirements, which benefits the communities and lowers the utility customers' cost. Seasonality of Business Based on historical trends, we expect our operating results to vary seasonally. Variations in normal weather patterns can cause changes in energy consumption which may influence the demand and timing of associated services for our fossil services offerings. Inclement weather can impact construction-related activities associated with pond and landfill remediation, which affects the timing of revenue generation for our remediation and compliance services. Our byproduct sales are also negatively affected during winter months when the use of cement and cement products is generally lower. Business Combinations On March 30, 2018, Charah Management completed a transaction with SCB Materials International, Inc. and affiliated entities (“SCB”), a previously unrelated third party, pursuant to which Charah Solutions acquired certain assets and liabilities of SCB for a purchase price of $35,000, with $20,000 paid at closing and $15,000 to be paid over time in conjunction with certain performance metrics. The contract also contained various mechanisms for a working capital true-up. The acquisition was accounted for under the acquisition method of accounting in accordance with ASC Topic 805, Business Combinations with the allocation of the purchase price for the acquisition finalized as of March 31, 2019. The recognized goodwill from the transaction was allocated to the Environmental Solutions segment. In November 2018, the $15,000 contingent consideration to be paid over time was reduced by $3,300. During the year ended December 31, 2020, the Company evaluated the recoverability of certain grinding technology assets. As part of that review, we assessed the likelihood of paying the contingent liability based on achieving certain performance sales levels using these technology assets. In the fourth quarter of 2020, the Company concluded that certain sales levels would not be achieved, and we reduced the corresponding liability by $9,702. This reduction was recognized as a component of operating income in the accompanying unaudited condensed consolidated statement of operations. As of March 31, 2021, we expect the remaining liability balance of $1,950 to be paid in 2022 and beyond. The fair value of the contingent consideration was estimated using unobservable inputs of future cash flows, which we consider to be Level 3 measurements.

Impact of the COVID-19 Pandemic

Impact of the COVID-19 Pandemic	3 Months Ended
	Mar. 31, 2021
Unusual or Infrequent Items, or Both [Abstract]
Impact of the COVID-19 Pandemic	Impact of the COVID-19 Pandemic In March 2020, the World Health Organization categorized the disease caused by a novel coronavirus (“COVID-19”) as a pandemic, and the President of the United States declared the COVID-19 pandemic to be a national emergency. The Company is a mission-critical contractor to the power generation industry, which has been identified as part of the Department of Homeland Security’s Critical Infrastructure Sector. On March 27, 2020, the U.S. government enacted the Coronavirus Aid, Relief, and Economic Security Act (the “CARES Act”), which includes modifications to the limitation on business interest expense and net operating loss carryforward provisions and provided a payment delay of certain employer payroll taxes during 2020. The Company deferred $1,637 of employer payroll taxes otherwise due in 2020, with 50% due by December 31, 2021 and the remaining 50% due by December 31, 2022. The CARES Act is not expected to have a material impact on the Company’s consolidated financial statements. In March 2020, as a response to the ongoing COVID-19 pandemic, we established a COVID-19 task force to oversee the Company’s initiatives, procedures and responses to address the potential impact of COVID-19. We have implemented measures to manage through possible service interruptions, and we are maintaining real-time communication across our entire organization and with our customers. As of May 12, 2021, we have not had any work stoppages and have not observed any significant slowdown in activity on existing job sites as a result of the COVID-19 pandemic. In April 2020, we implemented a series of preemptive cost-cutting and cost savings initiatives across the Company, including reductions in employee compensation, reductions in cash-based retainers to our Board of Directors, reduced hiring and significantly reducing discretionary spending, including travel restrictions. In addition, we are implementing applicable benefits of the CARES Act. In October

Recent Accounting Pronouncement

Recent Accounting Pronouncements	3 Months Ended
	Mar. 31, 2021
Accounting Changes and Error Corrections [Abstract]
Recent Accounting Pronouncements	Recent Accounting Pronouncements Recently Adopted Accounting Pronouncements In August 2020, the FASB issued ASU No. 2020-06, Debt – Debt with Conversion and Other Options (Subtopic 470-20) and Derivatives and Hedging – Contracts in Entity’s Own Equity (Subtopic 815 – 40): Accounting for Convertible Instruments and Contracts in an Entity’s Own Equity . This ASU simplifies the guidance on accounting for convertible debt instruments by removing the separation models for convertible debt with a cash conversion feature and convertible debt with a beneficial conversion feature. As a result, after adopting the ASU’s guidance, entities will not separately present in equity an embedded conversion feature in such debt. Instead, they will account for a convertible debt instrument wholly as debt and convertible preferred stock wholly as preferred stock unless certain other conditions are met. Also, the ASU requires the application of the if-converted method for calculating diluted earnings per share, and the treasury stock method will no longer be available. The Company early adopted ASU No. 2020-06, as permitted by the standard, as of January 1, 2021 with no significant impact on its consolidated financial statements. Recently Issued Accounting Pronouncements In February 2016, the FASB issued ASU No. 2016-02, Leases (Topic 842) , requiring all leases to be recognized on the balance sheet as a right-of-use asset and a lease liability, unless the lease is a short term lease (generally a lease with a term of 12 months or less). At the commencement date of the lease, the Company will recognize: (i) a lease liability for the Company’s obligation to make payments under the lease agreement, measured on a discounted basis; and (ii) a right-of-use asset that represents the Company’s right to use, or control the use of, the specified asset for the lease term. This ASU originally required recognition and measurement of leases at the beginning of the earliest period presented using a modified retrospective transition method. In July 2018, the FASB issued ASU No. 2018-11, which provided an additional (and optional) transition method that permits application of this ASU at the adoption date with recognition of a cumulative-effect adjustment to the opening balance of retained earnings in the period of adoption. In June 2020, the FASB issued ASU No. 2020-05 and delayed the effective date of this ASU, extending the effective date for non-public business entities, and making the ASU effective for the Company for the fiscal year ending December 31, 2022, and interim periods within the fiscal year ending December 31, 2023, with early adoption permitted. The Company has not yet selected a transition method and is currently evaluating the effect that the adoption of this ASU will have on its consolidated financial statements. In June 2016, the FASB issued ASU No. 2016-13, Financial Instruments - Credit Losses (Topic 326) - Measurement of Credit Losses on Financial Instruments , which introduces a new model for recognizing credit losses on financial instruments based on an estimate of current expected credit losses. The new model will apply to: (1) loans, accounts receivable, trade receivables, and other financial assets measured at amortized cost, (2) loan commitments and certain other off-balance sheet credit exposures, (3) debt securities and other financial assets measured at fair value through other comprehensive income, and (4) beneficial interests in securitized financial assets. The amendments contained in this ASU will be applied through a modified retrospective approach through a cumulative-effect adjustment to retained earnings as of the beginning of the first reporting period in which the guidance is adopted. In November 2018, the FASB issued ASU No. 2018-19, which amended the effective date of ASU No. 2016-13 and clarified that receivables arising from operating leases are not within the scope of Subtopic 326-20. In October 2019, the FASB delayed the effective date of this ASU, extending the effective date for non-public business entities and making the ASU effective for the Company for the fiscal year ending December 31, 2023, and interim periods therein, with early adoption permitted. The Company is currently evaluating the effect that the adoption of this ASU will have on its consolidated financial statements. In March 2020, the FASB issued ASU No. 2020-04, Reference Rate Reform (Topic 848) Facilitation of the Effects of Reference Rate Reform on Financial Reporting . The ASU provides optional expedients and exceptions for applying GAAP to contract modifications and hedging relationships, subject to meeting certain criteria, that reference LIBOR or another rate that is expected to be discontinued. In January 2021, the FASB issued ASU No. 2021-01, Reference Rate Reform (Topic 848). This ASU provides supplemental guidance and clarification to ASU No. 2020-04, and these updates must be adopted concurrently, cumulatively referred to as “Topic 848.” The amendments in Topic 848 are currently effective for all entities, and upon adoption, may be applied prospectively to contract modifications made on or before December 31, 2022. The Company is still assessing the impact of Topic 848 on its consolidated financial statements.

Discontinued Operations

Discontinued Operations	3 Months Ended
	Mar. 31, 2021
Discontinued Operations and Disposal Groups [Abstract]
Discontinued Operations	Discontinued Operations On November 19, 2020, the Company completed the Allied Transaction through an all-cash deal for $40,000, subject to adjustments for working capital and certain other adjustments as set forth in the Purchase Agreement, which are described below. The Allied Transaction was approved by a special committee of the Company’s board of directors consisting solely of independent directors, which obtained a fairness opinion in connection with the Allied Transaction. This Allied Transaction has been treated as a sale to an entity under common control, with $25,506 recognized as a contribution to equity during 2020. The parties made customary representations and warranties and have agreed to customary covenants in the Purchase Agreement. The Company entered into a non-competition and non-solicitation arrangement under the Purchase Agreement with the Purchaser, subject to customary exceptions. In addition, the parties also entered into a Transition Services Agreement pursuant to which the Company provided Allied and the Purchaser with certain transition assistance services from the date of the Allied Transaction until April 30, 2021 in exchange for payment. The Company recognized $43 resulting from the Transition Services Agreement as a credit within cost of sales in our accompanying unaudited condensed consolidated statement of operations during the three months ended March 31, 2021. The Company had receivables outstanding from Allied of $118 and $120 at March 31, 2021 and December 31, 2020, respectively. In accordance with applicable accounting guidance for the disposal of long-lived assets, the results of the Allied Transaction are presented as discontinued operations and, as such, have been excluded from continuing operations for all periods presented. The Company received cash proceeds of $37,860, which was net of transaction costs of $1,900 and Allied restricted cash of $240. The Company retained Allied liabilities of $3,500, recorded a $301 increase to paid-in-capital for the income tax impact related to the Allied Transaction and recognized accruals of $6,954 for working capital adjustments and $413 for other acquisition-related charges in accrued expenses in our Consolidated Balance Sheet as of December 31, 2020, to be paid in 2021. The Company paid the working capital settlement of $6,954 to the Purchaser and $367 of acquisition-related charges during the three months ended March 31, 2021. The following amounts related to discontinued operation were derived from historical financial information and have been segregated from continuing operations and reported as discontinued operations in our accompanying unaudited consolidated statements of operations: Three Months Ended March 31, 2020 Revenue $ 113,354 Cost of sales 107,452 Gross profit 5,902 General and administrative expenses 2,088 Operating income 3,814 Interest expense, net (a) (771) Income from discontinued operations before income taxes 3,043 Income tax expense — Income from discontinued operations $ 3,043 (a) Interest expense was allocated to discontinued operations due to the requirement in Amendment No. 4 to Credit Agreement that cash generated from the Allied Transaction was used to reduce our debt balances. The following table provides supplemental cash, cash equivalent and restricted cash information related to discontinued operations: Three Months Ended March 31, 2020 Cash and cash equivalents: Cash, cash equivalents and restricted cash - continuing operations $ 27,310 Cash, cash equivalents and restricted cash - discontinued operations 215 Total cash and cash equivalents $ 27,525 The depreciation and amortization, capital expenditures and significant operating noncash items of Allied were as follows: Three Months Ended March 31, 2020 Cash flows from discontinued operating activities: Depreciation and amortization $ 197 Loss on disposal of fixed assets 22 Non-cash shared-based compensation 7 Cash flows from discontinued investing activities: Purchase of property and equipment $ 191

Asset Acquisition

Asset Acquisition	3 Months Ended
	Mar. 31, 2021
Asset Acquisition [Abstract]
Asset Acquisition	Asset AcquisitionIn February 2021, the Company, through its wholly-owned special purpose vehicle subsidiary Gibbons Creek Environmental Redevelopment Group (“GCERG”), closed on an Asset Purchase Agreement (the “APA” or the “Agreement”) with Texas Municipal Power Agency to acquire, remediate and redevelop the Gibbons Creek Steam Electric Station and Reservoir (the “Gibbons Creek Transaction”). As part of this Agreement, GCERG took ownership of the 6,166 acre area (collectively, the “Purchased Assets”), which includes the closed power station and adjacent property, the 3,500 acre reservoir, dam and floodway. GCERG assumed all environmental responsibilities and became responsible for the decommissioning of the coal power plant as well as performing all environmental remediation work for the site landfills and ash ponds. At closing of the APA, GCERG became liable for and expressly fully assumed any and all environmental liabilities and environmental compliance, as well as, without limitation, any remediation, investigation, management, mitigation, closure, maintenance, reporting, removal, disposal of and any other actions with respect to any hazardous substances at, on, in, under, or emanating from the Purchased Assets. GCERG, at its discretion, plans to redevelop the property in an environmentally conscious manner that will expand economic activity and benefit the surrounding communities as well as restore the property to a state that will enable it to be put to its best potential use. The existing power plant will be demolished, and GCERG will work with the Texas Commission on Environmental Quality to complete all environmental remediation required for the property and then plans to redevelop the remediated property within all zoning restrictions. The redevelopment of the property is expected to be completed within 34 months. The Gibbons Creek Transaction was accounted for as an asset acquisition in accordance with ASC 805, Business Combinations, with the assumed liabilities net of cash received or owed to us by the seller comprising the purchase price. Since the fair value of the net assets acquired exceeded the cost, the Company allocated the difference pro rata on the basis of relative fair values to reduce land, property and equipment, and intangible assets acquired. The assets acquired and liabilities assumed as recognized within the Company's condensed consolidated balance sheet upon closing on the APA consisted of the following: Consideration and direct transaction costs: Asset retirement obligations $ (50,590) Bond and insurance accrued expenses, net (2,229) Direct transaction costs (2,336) Total consideration and transaction costs incurred (55,155) Asset Received: Cash 6,354 Restricted cash 28,546 Water Rights 5,196 Land 14,385 Plant, machinery and equipment 610 Vehicles 64 Total allocated value of assets acquired $ 55,155 The Company has identified asset retirement obligations within the assumed liabilities to be initially measured and valued in accordance with ASC 410, Asset Retirement and Environmental Obligations . We developed our estimates of these obligations using input from our operations personnel. Our estimates are based on our interpretation of current requirements and proposed regulatory changes and are intended to approximate fair value. Absent quoted market prices, the estimate of fair value is based on the best available information, including the results of present value techniques. We use professional engineering judgment and estimated prices paid for similar work to determine the fair value of these obligations. We are required to recognize these obligations at market prices whether we plan to contract with third parties or perform the work ourselves. Once we determined the estimated closure and post-closure costs for each asset retirement obligation, we inflation-adjusted those costs to the expected time of payment and discounted those expected future costs back to present value using an inflation rate of 3.0%. We discounted these costs to present value using the credit-adjusted, risk-free rate effective at the time the obligation was incurred, consistent with the expected cash flow approach. Any changes in expectations that result in an upward revision to the estimated cash flows are treated as a new liability and discounted at the current rate, while downward revisions are discounted at the historical weighted average rate of the recorded obligation. The credit-adjusted, risk-free discount rate used to calculate the present value of an obligation is specific to each individual asset retirement obligation. The weighted average rate applicable to our long-term asset retirement obligations related to the Gibbons Creek Transaction was approximately 4.5% at the acquisition date. Because these obligations are measured at estimated fair value using present value techniques, changes in the estimated cost or timing of future final capping, closure, and post-closure activities could result in a material change in these liabilities, related assets, and results of operations. We assess the appropriateness of the estimates used to develop our recorded balances annually, or more often if conditions warrant. Changes in inflation rates or the estimated costs, timing, or extent of future final closure and post-closure activities typically result in a current adjustment to the recorded liability and land asset. Demolition costs will be capitalized as part of the land as incurred as part of preparing the site for sale, since, at the acquisition date, (i) we planned to demolish the existing structure as part of the redevelopment plan for the acquired property, (ii) demolition is expected to occur within a reasonable period of time after acquisition, and (iii) such expected costs will be incurred to make the land saleable to a third party.

Revenue

Revenue	3 Months Ended
	Mar. 31, 2021
Revenue from Contract with Customer [Abstract]
Revenue	Revenue We disaggregate our revenue from customers by type of service and by geographic region as we believe it best depicts how the nature, amount, timing and uncertainty of our revenue and cash flows are affected by economic factors. See details in the tables below. Three Months Ended March 31, 2021 2020 Byproduct sales $ 15,098 $ 21,761 Construction contracts 19,939 14,847 Services 17,070 14,669 Total revenue $ 52,107 $ 51,277 Three Months Ended March 31, 2021 2020 United States $ 52,107 $ 50,642 Foreign — 635 Total revenue $ 52,107 $ 51,277 As of March 31, 2021, the Company had remaining performance obligations with an aggregate transaction price of $518,125 on construction contracts for which we recognize revenue over time. We expect to recognize approximately 20% of our remaining performance obligations as revenue during the remainder of 2021, 12% in 2022, 10% in 2023, and 59% thereafter. Revenue associated with our remaining performance obligations includes performance obligations related to our construction contracts. The balance of remaining performance obligations does not include variable consideration that was determined to be constrained as of March 31, 2021. As of March 31, 2021, we included unapproved change orders associated with project scope changes of $219 in determining the profit or loss on certain construction contracts. The timing of revenue recognition, billings and cash collections results in accounts receivable, contract assets, and contract liabilities on the unaudited condensed consolidated balance sheets. Our contract assets are as follows: March 31, 2021 December 31, 2020 Costs and estimated earnings in excess of billings $ 12,523 $ 12,196 Retainage 6,397 6,133 Total contract assets $ 18,920 $ 18,329 Our contract liabilities are as follows: March 31, 2021 December 31, 2020 Deferred revenue $ 1,440 $ 128 Billings in excess of costs and estimated earnings 29,356 6,167 Total contract liabilities $ 30,796 $ 6,295 We recognized revenue of $5,709 for the three months ended March 31, 2021 that was previously included in contract liabilities at December 31, 2020. The increase in contract liabilities was primarily due to an increase in billings in excess of costs and estimated earnings associated with billings during the three months ended March 31, 2021 for a specific remediation and compliance project. Costs and estimated earnings on uncompleted contracts are as follows: March 31, 2021 December 31, 2020 Costs incurred on uncompleted contracts $ 138,644 $ 123,339 Estimated earnings 21,332 18,425 Total costs and estimated earnings 159,976 141,764 Less billings to date (176,809) (135,735) Costs and estimated earnings in excess of billings $ (16,833) $ 6,029 The net balance in process classified on the unaudited condensed consolidated balance sheets is as follows: March 31, 2021 December 31, 2020 Costs and estimated earnings in excess of billings $ 12,523 $ 12,196 Billings in excess of costs and estimated earnings (29,356) (6,167) Net balance in process $ (16,833) $ 6,029 Anticipated losses on long-term contracts are recognized when such losses become evident. As of March 31, 2021 and December 31, 2020, accruals for anticipated losses on long-term contracts were $122 and $155, respectively.

Balance Sheet Items

Balance Sheet Items	3 Months Ended
	Mar. 31, 2021
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Balance Sheet Items	Balance Sheet Items Allowance for doubtful accounts The following table presents the changes in the allowance for doubtful accounts: Three Months Ended March 31, 2021 2020 Balance, beginning of period $ 467 $ 146 Add: provision 93 119 Less: deduction and other adjustments (2) (11) Balance, end of period $ 558 $ 254 Property and equipment, net The following table shows the components of property and equipment, net: March 31, 2021 December 31, 2020 Plant, machinery and equipment $ 68,434 $ 68,308 Structural fill site improvements 55,760 55,760 Vehicles 12,761 12,824 Office equipment 600 582 Buildings and leasehold improvements 267 262 Land, land improvements and structural fill sites 14,533 432 Capital lease assets 7,449 6,627 Construction in progress 2,249 1,961 Total property and equipment $ 162,053 $ 146,756 Less: accumulated depreciation (100,864) (97,286) Property and equipment, net $ 61,189 $ 49,470 Land, land improvements and structural fill sites includes $4,467 of real property acquired in the Gibbons Creek Transaction that the Company is actively demolishing and for which depreciation expense is not being recorded. Depreciation expense was $4,173 and $4,231 for the three months ended March 31, 2021 and 2020, respectively. Capital leases The following table shows the components of capital lease assets, net: March 31, 2021 December 31, 2020 Capital lease assets $ 7,449 $ 6,627 Less: accumulated depreciation (920) (368) Capital lease assets, net $ 6,529 $ 6,259 The Company's depreciation of capital lease assets is included within depreciation expense as disclosed above. Sales-type lease In March 2021, the Company amended an existing ground lease with a third party concerning one of the Company's structural fill assets with a 30-year term expiring on December 31, 2050. The lease includes multiple options that may be exercised at any time during the lease term for the lessee to purchase all or a portion of the premises as well as a put option (the “Put Option”) that provides the Company the option to require the lessee to purchase all of the premises at the end of the lease term. In accordance with ASC 840, Leases , the Company considered whether this lease, as amended, met any of the following four criteria as part of classifying the lease at the amendment date: (a) the lease transfers ownership of the property to the lessee by the end of the lease term; (b) the lease contains a bargain purchase option; (c) the lease term is equal to 75 percent or more of the estimated economic life of the lease property; and (d) the present value of the minimum lease payments, excluding executory costs, equals or exceeds 90 percent of the excess of the fair value of the lease property to the lessor at lease inception. This lease was recorded as a sales-type capital lease due to the Put Option provision contained within the lease agreement that represents a transfer of ownership of the property by the end of the lease term. Additionally, the Company determined that collectability of the lease payments was reasonably assured and that there were not any significant uncertainties related to costs that it has yet to incur with respect to the lease. At the amendment date of the lease, a discount rate of 3.9% implicit in the sales-type lease was used to calculate the present value of the minimum lease payments, which the Company recorded as a lease receivable. The Company recognized a gain of $5,568 within other operating income, net in the accompanying unaudited condensed consolidated statement of operations. The following table reflects the classification of the lease receivable within our accompanying unaudited condensed consolidated balance sheet: March 31, 2021 Lease receivable $ 5,985 Less: current portion in prepaid expenses and other current assets (294) Non-current portion in other assets $ 5,691 Accrued liabilities The following table shows the components of accrued liabilities: March 31, 2021 December 31, 2020 Accrued expenses $ 11,365 $ 19,323 Accrued working capital adjustment for the Allied Transaction — 6,954 Accrued payroll and bonuses 2,430 7,227 Accrued preferred stock dividends 2,067 1,356 Accrued interest 99 77 Accrued liabilities $ 15,961 $ 34,937 Asset Retirement Obligations The Company owns one structural fill site with continuing maintenance and monitoring requirements after their closure and four tracts of real property with decommissioning, remediation and monitoring requirements. As of March 31, 2021 and December 31, 2020, the Company has accrued $54,112 and $5,159, respectively, for these asset retirement obligations. The following table reflects the activity for the asset retirement obligations: Three Months Ended March 31, 2021 2020 Balance, beginning of period $ 5,159 $ 15,131 Liabilities acquired (See Note 5) 50,590 — Liabilities settled (1,870) (2,332) Accretion 233 188 Balance, end of period 54,112 12,987 Less: current portion (18,729) (7,836) Non-current portion $ 35,383 $ 5,151

Equity Method Investment

Equity Method Investment	3 Months Ended
	Mar. 31, 2021
Equity Method Investments and Joint Ventures [Abstract]
Equity Method Investment	Equity Method Investment Charah has an investment in a company that provides ash management and remarketing services to the electric utility industry. Charah accounts for its investment under the equity method of accounting because Charah has significant influence over the financial and operating policies of the company. Charah had a payable to the equity method investment of $2 at March 31, 2021 and a receivable due from the equity method investment of $182 at December 31, 2020. In December 2020, the Company informed our joint venture partner of our decision to exit the joint venture due to unfavorable economic conditions associated with a new contract that would adversely impact the future earnings capacity of our investment. In 2021, the joint venture sold its property and equipment at an amount exceeding carrying value and continues to settle its remaining current assets and liabilities through the normal course of business. Summarized balance sheet information of our equity method investment entity is as follows: March 31, 2021 December 31, 2020 Current assets $ 80 $ 1,812 Noncurrent assets — 282 Total assets $ 80 $ 2,094 Current liabilities — 432 Equity of Charah 40 831 Equity of joint venture partner 40 831 Total liabilities and members’ equity $ 80 $ 2,094 Summarized financial performance of our equity method investment entity is as follows: Three Months Ended March 31, 2021 2020 Revenue $ 555 $ 1,478 Net income 404 592 Charah Solutions’ share of net income 202 296 The following table reflects our proportional ownership activity in our investment account: Three Months Ended March 31, 2021 2020 Opening balance $ 831 $ 5,078 Distributions (993) (593) Share of net income 202 296 Closing balance $ 40 $ 4,781

Related Party Transactions

Related Party Transactions	3 Months Ended
	Mar. 31, 2021
Related Party Transactions [Abstract]
Related Party Transactions	Related Party Transactions ATC Group Services LLC (“ATC”), an entity owned by BCP, our majority stockholder, provided environmental consulting and engineering services at certain service sites. Expenses to ATC were $54 and $30 for the three months ended March 31, 2021 and 2020, respectively. The Company had no receivables outstanding from ATC at March 31, 2021 and December 31, 2020. The Company had payables and accrued expenses, net of credit memos, due to ATC of $12 and $29 at March 31, 2021 and December 31, 2020, respectively. As further discussed in Note 4, Discontinued Operations, in November 2020, the Company sold its Allied subsidiary to an affiliate of BCP. As further discussed in Note 13, Mezzanine Equity, in March 2020, the Company entered into an agreement with an investment fund affiliated with BCP to sell 26,000 shares of Preferred Stock.

Goodwill and Intangible Assets

Goodwill and Intangible Assets	3 Months Ended
	Mar. 31, 2021
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill and Intangible Assets	Goodwill and Intangible Assets Goodwill and indefinite-lived intangible assets are not amortized but instead are tested for impairment annually or more often if events or changes in circumstances indicate that the fair value of the asset may have decreased below its carrying value. We perform our impairment test effective October 1st of each year and evaluate for impairment indicators between annual impairment tests, of which there were none. There was no goodwill activity during the three months ended March 31, 2021. Indefinite-Lived and Definite-Lived Intangible Assets Our intangible assets, net include a trade name and water rights that are considered to have indefinite lives. As further discussed in Note 5, in February 2021, the Company acquired an indefinite-lived intangible asset for water rights through the Gibbons Creek Transaction. Our intangible assets, net include customer relationships that are considered to have a definite life. Our customer relationships are amortized on a straight-line basis over their estimated useful lives of 10 years. The amortization expense of our definite-lived intangible assets was $1,974 and $2,095 for the three months ended March 31, 2021 and 2020, respectively. The Company’s intangible assets consist of the following: March 31, 2021 December 31, 2020 Gross Carrying Amount Accumulated Amortization Net Carrying Amount Gross Carrying Amount Accumulated Amortization Net Carrying Amount Definite-lived intangibles Customer relationships $ 78,942 $ (32,806) $ 46,136 $ 78,942 $ (30,832) $ 48,110 Indefinite-lived intangibles Charah trade name 13,316 13,316 Water rights 5,196 — Total 18,512 13,316 Total $ 64,648 $ 61,426

Credit Agreement

Credit Agreement	3 Months Ended
	Mar. 31, 2021
Debt Disclosure [Abstract]
Credit Agreement	Credit Agreement On September 21, 2018, we entered into a credit agreement (the “Credit Facility”) by and among us, the lenders party thereto from time to time and Bank of America, N.A., as administrative agent (the “Administrative Agent”). The Credit Facility includes: • A revolving loan not to exceed $50,000 (the “Revolving Loan”); • A term loan of $205,000 (the “Closing Date Term Loan”); and • A commitment to loan up to a further $25,000 in term loans, which expired in March 2020 (the “Delayed Draw Commitment” and the term loans funded under such Delayed Draw Commitment, the “Delayed Draw Term Loan,” together with the Closing Date Term Loan, the “Term Loan”). After the Fourth Amendment, all amounts associated with the Revolving Loan and the Term Loan under the Credit Facility will mature in July 2022, as discussed more fully below. The interest rates per annum applicable to the loans under the Credit Facility are based on a fluctuating rate of interest measured by reference to, at our election, either (i) the Eurodollar rate, currently the London Inter-bank Offered Rate (“LIBOR”), or (ii) an alternative base rate. Various margins are added to the interest rate based upon our consolidated net leverage ratio (as defined in the Credit Facility). Customary fees are payable regarding the Credit Facility and include (i) commitment fees for the unused portions of the Credit Facility and (ii) fees on outstanding letters of credit. Amounts borrowed under the Credit Facility are secured by substantially all of the assets of the Company. The Credit Facility contains various customary representations and warranties and restrictive covenants that, among other things and subject to specified exceptions, restrict the ability of us and our restricted subsidiaries to grant liens, incur indebtedness (including guarantees), make investments, engage in mergers and acquisitions, make dispositions of assets, make restricted payments or change the nature of our or our subsidiaries’ business. The Credit Facility contains financial covenants related to the consolidated net leverage ratio and the fixed charge coverage ratio (as defined in the Credit Facility) that have been modified as described below. The Credit Facility also contains certain affirmative covenants, including reporting requirements, such as delivering financial statements, certificates and notices of certain events, maintaining insurance and providing additional guarantees and collateral in certain circumstances. The Credit Facility includes customary events of default, including non-payment of principal, interest or fees as they come due, violation of covenants, inaccuracy of representations or warranties, cross-default to certain other material indebtedness, bankruptcy and insolvency events, invalidity or impairment of guarantees or security interests, material judgments and change of control. The Revolving Loan provides a principal amount of up to $50,000, reduced by outstanding letters of credit. As of March 31, 2021 and December 31, 2020, $19,085 and $12,003, respectively, was outstanding on the Revolving Loan and $15,879 and $11,079, respectively, of letters of credit were outstanding. But for Amendment No. 2 to Credit Agreement and Waiver (the “Second Amendment”), as of June 30, 2019, we would not have complied with the requirement to maintain a consolidated net leverage ratio of 3.75 to 1.00 under the Credit Facility. On August 13, 2019, we entered into the Second Amendment, under which, among other things, the required lenders agreed to waive such non-compliance. Also, according to the terms of the Second Amendment, the Credit Facility was amended to revise the required financial covenant ratios, which have been modified as described below. As consideration for these accommodations, we agreed that amounts borrowed under the Delayed Draw Commitment would not exceed $15,000 at any one time outstanding (without reducing the overall Delayed Draw Commitment amount). Further, the margin of interest charged on all outstanding loans was increased to 4.00% for loans based on LIBOR and 3.00% for loans based on the alternative base rate. The Second Amendment revised the amount of (i) the commitment fees to 0.35% at all times for the unused portions of the Credit Facility and (ii) fees on outstanding letters of credit to 3.35% at all times. The Second Amendment also added a requirement to make two additional scheduled prepayments of outstanding loans under the Credit Facility, including a payment of $50,000 on or before September 13, 2019, and an additional payment of $40,000 on or before March 31, 2020. The $50,000 payment was made before September 13, 2019, using proceeds of the Brickhaven deemed termination payment. The Second Amendment required the Company to pay the Administrative Agent an amendment fee in an amount equal to 1.00% of the total credit exposure under the Credit Facility immediately before the effectiveness of the Second Amendment, and this fee was paid on August 16, 2020. The Second Amendment also included revisions to the restrictive covenants, including removing certain exceptions to the restrictions on our ability to make acquisitions, investments and dividends or other distributions. After giving effect to the Second Amendment, we will not be permitted to make any distributions or dividends to our stockholders without the required lenders’ consent. In March 2020, the Company entered into Amendment No. 3 to Credit Agreement (the “Third Amendment”). Under the terms of the Third Amendment, the Credit Facility was amended to waive the mandatory $40,000 prepayment due on or before March 31, 2020, and to revise the required financial covenant ratios such that, after giving effect to the Third Amendment, we were not required to comply with any financial covenants through December 30, 2020. After December 30, 2020, we were required to comply with a maximum consolidated net leverage ratio of 6.50 to 1.00 from December 31, 2020 through June 29, 2021, decreasing to 6.00 to 1.00 from June 30, 2021 through December 30, 2021, and to 3.50 to 1.00 as of December 31, 2021 and thereafter. After giving effect to the Third Amendment, we were also required to comply with a minimum fixed charge coverage ratio of 1.00 to 1.00 as of December 31, 2020, increasing to 1.20 to 1.00 as of March 31, 2021 and thereafter. In the event that we were unable to comply in the future with such financial covenants upon delivery of our financial statements under the terms of the Credit Facility, an Event of Default (as defined in the Credit Facility) will have occurred, and the Administrative Agent can then, following a specified cure period, declare the unpaid principal amount of all outstanding loans, all interest accrued and unpaid thereon, and all other amounts payable to be immediately due and payable by the Company. The Third Amendment increased the maximum amount available to be borrowed under the Delayed Draw Commitment from $15,000 to $25,000, subject to certain quarterly amortization payments. The Third Amendment also included revisions to the restrictive covenants, including increasing the amount of indebtedness that the Company may incur regarding certain capitalized leases from $50,000 to $75,000. Under the Third Amendment, the Company has agreed to make monthly amortization payments in respect of term loans beginning in April 2020 and move the maturity date for all loans under the Credit Facility to July 31, 2022 (the “Maturity Date”). Also, if at any time after August 13, 2019, the outstanding principal amount of the Delayed Draw Term Loans exceeds $10,000, we will incur additional interest at a rate equal to 10.0% per annum on all daily average amounts exceeding $10,000 payable at March 31, 2020 and at the Maturity Date. Further, the Third Amendment requires mandatory prepayments of revolving loans with any cash held by the Company over $10,000, which excludes the amount of proceeds received in respect of the Preferred Stock Offering (as defined below) to the extent such funds are used for liquidity and general corporate purposes. The Company has also agreed to an increase of four percent (4%) to the interest rate applicable to the Closing Date Term Loan compounded monthly and paid in kind by adding such portion to the outstanding principal amount. As a condition to entering into the Second Amendment, we were required to pay the Administrative Agent an amendment fee (the “Second Amendment Fee”) in an amount equal to 1.50% of the total credit exposure under the Credit Facility immediately before the effectiveness of the Second Amendment. Of the Second Amendment Fee, 0.50% was due and paid on October 15, 2019, and 1.00% of such Second Amendment Fee was paid on August 16, 2020. We were also required to pay the Administrative Agent an amendment fee associated with the Third Amendment (the “Third Amendment Fee”) in an amount equal to 0.20% of the total credit exposure under the Credit Facility, immediately before the effectiveness of the Third Amendment, with such Third Amendment Fee paid on June 30, 2020. Finally, we will also pay an additional fee with respect to the Third Amendment in the amount of $2,000, with such fee being due and payable on the Maturity Date. In November 2020, the Company entered into Amendment No. 4 to Credit Agreement (the “Fourth Amendment”). Under the terms of the Fourth Amendment, the Credit Facility was amended to revise the required financial covenant ratios such that, after giving effect to the Fourth Amendment, for the periods ending December 31, 2020 through March 30, 2021, we will be required to comply with a maximum consolidated leverage of 5.50 to 1.00, decreasing to 4.80 to 1.00 for the periods ended March 31, 2021 through September 29, 2021, to 4.50 to 1.00 for the periods ending September 30, 2021 through December 30, 2021, and to 3.50 to 1.00 as of December 31, 2021 and thereafter. After giving effect to the Fourth Amendment, we will also be required to comply with a minimum fixed charge coverage ratio of 1.00 to 1.00 as of March 31, 2021, increasing to 1.20 to 1.00 as of June 30, 2021 and thereafter. Our ability to comply with such financial covenants depends on the Company’s forecasted leverage and adjusted EBITDA for the applicable periods, which could be adversely impacted by the effects of COVID-19 or other unforeseen factors. Our financial forecasts, which we believe are reasonable given current market conditions, indicate that the Company will be in compliance with all financial covenants through the one-year period following the issuance of these financial statements. Those financial forecasts are highly dependent upon the demand for our byproduct sales, timing in new contract awards and completion of existing work. The current pandemic is making it more difficult to forecast future results, and as a result, it may have a significant impact on the Company’s results of operations, financial position, liquidity or capital resources. These significant risks may also have an adverse impact and cause us not to comply with our financial covenants. If we are not in compliance with our financial covenants, the Company could be required to seek waivers, forbearance or amendments from the Administrative Agent. There can be no assurance that we could obtain such waivers, forbearance, or amendments as any future agreements with the Administrative Agent are not considered in the Company’s control. If we are unable to comply in the future with such financial covenants upon delivery of our financial statements according to the terms of the Credit Facility, an Event of Default (as defined in the Credit Facility) will have occurred. The Administrative Agent can then, following a specified cure period, declare the unpaid principal amount of all outstanding loans, all interest accrued and unpaid thereon, and all other amounts payable to be immediately due and payable by the Company. In accordance with ASC 470, Debt, the Company calculated the present value of the cash flows for purposes of applying the 10% cash flow test for the Third Amendment and concluded that the original and new debt instruments were substantially different, necessitating that the Third Amendment be accounted for as an extinguishment. The Company capitalized third-party fees of $1,623 that will be amortized prospectively through interest expense, net in the accompanying unaudited condensed consolidated statement of operations using the effective interest method through the Maturity Date. Fees payable to the lenders (as discussed above) of $5,162 were associated with the extinguishment of the old debt instrument and included in loss on extinguishment of debt in the accompanying unaudited condensed consolidated statements of operations. The Company wrote off unamortized debt issuance costs of $3,441, which is included in loss on extinguishment of debt in the accompanying unaudited condensed consolidated statements of operations. The Company also calculated the present value of the cash flows for purposes of applying the 10% cash flow test for the Fourth Amendment and concluded that the original and new debt instruments were not substantially different, necessitating that the Fourth Amendment be accounted for as a modification. The following table summarizes the major components of debt at each balance sheet date and provides maturities and interest rate ranges for each major category as of March 31, 2021 and December 31, 2020: March 31, 2021 December 31, 2020 Various equipment notes entered into in November 2017, payable in monthly installments ranging from $6 to $24, including interest at 5.2%, maturing in December 2022 through December 2023. The notes are secured by equipment with a net book value of $1,867 as of March 31, 2021. $ 2,596 $ 2,871 Various equipment notes entered into in 2018, payable in monthly installments ranging from $1 to $39, including interest ranging from 5.6% to 6.8%, maturing in March 2023 through May 2025. The notes are secured by equipment with a net book value of $7,239 as of March 31, 2021. 7,930 8,446 Various equipment notes entered into in 2019, payable in monthly installments ranging from $2 to $23, including interest ranging from 3.9% to 6.4%, maturing in April 2021 through December 2024. The notes are secured by equipment with a net book value of $2,784 as of March 31, 2021. 3,273 3,490 Various equipment notes entered into in 2020, payable in monthly installments ranging from $9 to $10, including interest of 5.4%, maturing in August 2025. The notes are secured by equipment with a net book value of $2,119 as of March 31, 2021. 1,916 2,011 Various equipment notes entered into in 2021, payable in monthly installments ranging from $3 to $8, including interest of 5.4%, maturing in February 2026. The notes are secured by equipment with a net book value of $844 as of March 31, 2021. 761 — Various commercial insurance premium financing agreements entered into in 2020, payable in monthly installments ranging from $22 to $126, including interest ranging from 3.4% to 3.8%, that matured in February and March 2021. — 453 A commercial insurance premium financing agreement entered into in 2021, payable in monthly installments of $24, including interest of 3.9%, maturing in October 2021. 167 — A $10,000 equipment line with a bank, entered into in December 2017, secured by all equipment purchased with the proceeds of the loan. Interest is calculated on any outstanding amounts using a fixed rate of 4.5%. The equipment line converted to a term loan in September 2018 with a maturity date of June 22, 2023. The term loan is secured by equipment with a net book value of $3,809 as of March 31, 2021. 5,295 5,791 Pursuant to the terms of the Third Amendment, the Closing Date Term Loan and the Delayed Draw Term Loan entered into in September 2018 as part of the Syndicated Credit Facility (see also Note 11), maturing July 2022. The interest rate applicable to the Closing Date Term Loan and the Delayed Draw Term Loan is based on a fluctuating rate of interest measured by reference to, at the Company’s election, either (i) the Eurodollar rate, currently the LIBOR rate, or (ii) an alternative base rate. With respect to the Closing Date Term Loan, principal payments required are $1,280 monthly from April 2021 through December 2021, and $1,500 monthly thereafter. The term loan is secured by substantially all the assets of the Company and is subject to certain financial covenants. 122,629 125,239 Total 144,567 148,301 Less debt issuance costs, net (860) (1,024) 143,707 147,277 Less current maturities (22,896) (22,308) Notes payable due after one year $ 120,811 $ 124,969

Notes Payable

Notes Payable	3 Months Ended
	Mar. 31, 2021
Debt Disclosure [Abstract]
Notes Payable	Credit Agreement On September 21, 2018, we entered into a credit agreement (the “Credit Facility”) by and among us, the lenders party thereto from time to time and Bank of America, N.A., as administrative agent (the “Administrative Agent”). The Credit Facility includes: • A revolving loan not to exceed $50,000 (the “Revolving Loan”); • A term loan of $205,000 (the “Closing Date Term Loan”); and • A commitment to loan up to a further $25,000 in term loans, which expired in March 2020 (the “Delayed Draw Commitment” and the term loans funded under such Delayed Draw Commitment, the “Delayed Draw Term Loan,” together with the Closing Date Term Loan, the “Term Loan”). After the Fourth Amendment, all amounts associated with the Revolving Loan and the Term Loan under the Credit Facility will mature in July 2022, as discussed more fully below. The interest rates per annum applicable to the loans under the Credit Facility are based on a fluctuating rate of interest measured by reference to, at our election, either (i) the Eurodollar rate, currently the London Inter-bank Offered Rate (“LIBOR”), or (ii) an alternative base rate. Various margins are added to the interest rate based upon our consolidated net leverage ratio (as defined in the Credit Facility). Customary fees are payable regarding the Credit Facility and include (i) commitment fees for the unused portions of the Credit Facility and (ii) fees on outstanding letters of credit. Amounts borrowed under the Credit Facility are secured by substantially all of the assets of the Company. The Credit Facility contains various customary representations and warranties and restrictive covenants that, among other things and subject to specified exceptions, restrict the ability of us and our restricted subsidiaries to grant liens, incur indebtedness (including guarantees), make investments, engage in mergers and acquisitions, make dispositions of assets, make restricted payments or change the nature of our or our subsidiaries’ business. The Credit Facility contains financial covenants related to the consolidated net leverage ratio and the fixed charge coverage ratio (as defined in the Credit Facility) that have been modified as described below. The Credit Facility also contains certain affirmative covenants, including reporting requirements, such as delivering financial statements, certificates and notices of certain events, maintaining insurance and providing additional guarantees and collateral in certain circumstances. The Credit Facility includes customary events of default, including non-payment of principal, interest or fees as they come due, violation of covenants, inaccuracy of representations or warranties, cross-default to certain other material indebtedness, bankruptcy and insolvency events, invalidity or impairment of guarantees or security interests, material judgments and change of control. The Revolving Loan provides a principal amount of up to $50,000, reduced by outstanding letters of credit. As of March 31, 2021 and December 31, 2020, $19,085 and $12,003, respectively, was outstanding on the Revolving Loan and $15,879 and $11,079, respectively, of letters of credit were outstanding. But for Amendment No. 2 to Credit Agreement and Waiver (the “Second Amendment”), as of June 30, 2019, we would not have complied with the requirement to maintain a consolidated net leverage ratio of 3.75 to 1.00 under the Credit Facility. On August 13, 2019, we entered into the Second Amendment, under which, among other things, the required lenders agreed to waive such non-compliance. Also, according to the terms of the Second Amendment, the Credit Facility was amended to revise the required financial covenant ratios, which have been modified as described below. As consideration for these accommodations, we agreed that amounts borrowed under the Delayed Draw Commitment would not exceed $15,000 at any one time outstanding (without reducing the overall Delayed Draw Commitment amount). Further, the margin of interest charged on all outstanding loans was increased to 4.00% for loans based on LIBOR and 3.00% for loans based on the alternative base rate. The Second Amendment revised the amount of (i) the commitment fees to 0.35% at all times for the unused portions of the Credit Facility and (ii) fees on outstanding letters of credit to 3.35% at all times. The Second Amendment also added a requirement to make two additional scheduled prepayments of outstanding loans under the Credit Facility, including a payment of $50,000 on or before September 13, 2019, and an additional payment of $40,000 on or before March 31, 2020. The $50,000 payment was made before September 13, 2019, using proceeds of the Brickhaven deemed termination payment. The Second Amendment required the Company to pay the Administrative Agent an amendment fee in an amount equal to 1.00% of the total credit exposure under the Credit Facility immediately before the effectiveness of the Second Amendment, and this fee was paid on August 16, 2020. The Second Amendment also included revisions to the restrictive covenants, including removing certain exceptions to the restrictions on our ability to make acquisitions, investments and dividends or other distributions. After giving effect to the Second Amendment, we will not be permitted to make any distributions or dividends to our stockholders without the required lenders’ consent. In March 2020, the Company entered into Amendment No. 3 to Credit Agreement (the “Third Amendment”). Under the terms of the Third Amendment, the Credit Facility was amended to waive the mandatory $40,000 prepayment due on or before March 31, 2020, and to revise the required financial covenant ratios such that, after giving effect to the Third Amendment, we were not required to comply with any financial covenants through December 30, 2020. After December 30, 2020, we were required to comply with a maximum consolidated net leverage ratio of 6.50 to 1.00 from December 31, 2020 through June 29, 2021, decreasing to 6.00 to 1.00 from June 30, 2021 through December 30, 2021, and to 3.50 to 1.00 as of December 31, 2021 and thereafter. After giving effect to the Third Amendment, we were also required to comply with a minimum fixed charge coverage ratio of 1.00 to 1.00 as of December 31, 2020, increasing to 1.20 to 1.00 as of March 31, 2021 and thereafter. In the event that we were unable to comply in the future with such financial covenants upon delivery of our financial statements under the terms of the Credit Facility, an Event of Default (as defined in the Credit Facility) will have occurred, and the Administrative Agent can then, following a specified cure period, declare the unpaid principal amount of all outstanding loans, all interest accrued and unpaid thereon, and all other amounts payable to be immediately due and payable by the Company. The Third Amendment increased the maximum amount available to be borrowed under the Delayed Draw Commitment from $15,000 to $25,000, subject to certain quarterly amortization payments. The Third Amendment also included revisions to the restrictive covenants, including increasing the amount of indebtedness that the Company may incur regarding certain capitalized leases from $50,000 to $75,000. Under the Third Amendment, the Company has agreed to make monthly amortization payments in respect of term loans beginning in April 2020 and move the maturity date for all loans under the Credit Facility to July 31, 2022 (the “Maturity Date”). Also, if at any time after August 13, 2019, the outstanding principal amount of the Delayed Draw Term Loans exceeds $10,000, we will incur additional interest at a rate equal to 10.0% per annum on all daily average amounts exceeding $10,000 payable at March 31, 2020 and at the Maturity Date. Further, the Third Amendment requires mandatory prepayments of revolving loans with any cash held by the Company over $10,000, which excludes the amount of proceeds received in respect of the Preferred Stock Offering (as defined below) to the extent such funds are used for liquidity and general corporate purposes. The Company has also agreed to an increase of four percent (4%) to the interest rate applicable to the Closing Date Term Loan compounded monthly and paid in kind by adding such portion to the outstanding principal amount. As a condition to entering into the Second Amendment, we were required to pay the Administrative Agent an amendment fee (the “Second Amendment Fee”) in an amount equal to 1.50% of the total credit exposure under the Credit Facility immediately before the effectiveness of the Second Amendment. Of the Second Amendment Fee, 0.50% was due and paid on October 15, 2019, and 1.00% of such Second Amendment Fee was paid on August 16, 2020. We were also required to pay the Administrative Agent an amendment fee associated with the Third Amendment (the “Third Amendment Fee”) in an amount equal to 0.20% of the total credit exposure under the Credit Facility, immediately before the effectiveness of the Third Amendment, with such Third Amendment Fee paid on June 30, 2020. Finally, we will also pay an additional fee with respect to the Third Amendment in the amount of $2,000, with such fee being due and payable on the Maturity Date. In November 2020, the Company entered into Amendment No. 4 to Credit Agreement (the “Fourth Amendment”). Under the terms of the Fourth Amendment, the Credit Facility was amended to revise the required financial covenant ratios such that, after giving effect to the Fourth Amendment, for the periods ending December 31, 2020 through March 30, 2021, we will be required to comply with a maximum consolidated leverage of 5.50 to 1.00, decreasing to 4.80 to 1.00 for the periods ended March 31, 2021 through September 29, 2021, to 4.50 to 1.00 for the periods ending September 30, 2021 through December 30, 2021, and to 3.50 to 1.00 as of December 31, 2021 and thereafter. After giving effect to the Fourth Amendment, we will also be required to comply with a minimum fixed charge coverage ratio of 1.00 to 1.00 as of March 31, 2021, increasing to 1.20 to 1.00 as of June 30, 2021 and thereafter. Our ability to comply with such financial covenants depends on the Company’s forecasted leverage and adjusted EBITDA for the applicable periods, which could be adversely impacted by the effects of COVID-19 or other unforeseen factors. Our financial forecasts, which we believe are reasonable given current market conditions, indicate that the Company will be in compliance with all financial covenants through the one-year period following the issuance of these financial statements. Those financial forecasts are highly dependent upon the demand for our byproduct sales, timing in new contract awards and completion of existing work. The current pandemic is making it more difficult to forecast future results, and as a result, it may have a significant impact on the Company’s results of operations, financial position, liquidity or capital resources. These significant risks may also have an adverse impact and cause us not to comply with our financial covenants. If we are not in compliance with our financial covenants, the Company could be required to seek waivers, forbearance or amendments from the Administrative Agent. There can be no assurance that we could obtain such waivers, forbearance, or amendments as any future agreements with the Administrative Agent are not considered in the Company’s control. If we are unable to comply in the future with such financial covenants upon delivery of our financial statements according to the terms of the Credit Facility, an Event of Default (as defined in the Credit Facility) will have occurred. The Administrative Agent can then, following a specified cure period, declare the unpaid principal amount of all outstanding loans, all interest accrued and unpaid thereon, and all other amounts payable to be immediately due and payable by the Company. In accordance with ASC 470, Debt, the Company calculated the present value of the cash flows for purposes of applying the 10% cash flow test for the Third Amendment and concluded that the original and new debt instruments were substantially different, necessitating that the Third Amendment be accounted for as an extinguishment. The Company capitalized third-party fees of $1,623 that will be amortized prospectively through interest expense, net in the accompanying unaudited condensed consolidated statement of operations using the effective interest method through the Maturity Date. Fees payable to the lenders (as discussed above) of $5,162 were associated with the extinguishment of the old debt instrument and included in loss on extinguishment of debt in the accompanying unaudited condensed consolidated statements of operations. The Company wrote off unamortized debt issuance costs of $3,441, which is included in loss on extinguishment of debt in the accompanying unaudited condensed consolidated statements of operations. The Company also calculated the present value of the cash flows for purposes of applying the 10% cash flow test for the Fourth Amendment and concluded that the original and new debt instruments were not substantially different, necessitating that the Fourth Amendment be accounted for as a modification. The following table summarizes the major components of debt at each balance sheet date and provides maturities and interest rate ranges for each major category as of March 31, 2021 and December 31, 2020: March 31, 2021 December 31, 2020 Various equipment notes entered into in November 2017, payable in monthly installments ranging from $6 to $24, including interest at 5.2%, maturing in December 2022 through December 2023. The notes are secured by equipment with a net book value of $1,867 as of March 31, 2021. $ 2,596 $ 2,871 Various equipment notes entered into in 2018, payable in monthly installments ranging from $1 to $39, including interest ranging from 5.6% to 6.8%, maturing in March 2023 through May 2025. The notes are secured by equipment with a net book value of $7,239 as of March 31, 2021. 7,930 8,446 Various equipment notes entered into in 2019, payable in monthly installments ranging from $2 to $23, including interest ranging from 3.9% to 6.4%, maturing in April 2021 through December 2024. The notes are secured by equipment with a net book value of $2,784 as of March 31, 2021. 3,273 3,490 Various equipment notes entered into in 2020, payable in monthly installments ranging from $9 to $10, including interest of 5.4%, maturing in August 2025. The notes are secured by equipment with a net book value of $2,119 as of March 31, 2021. 1,916 2,011 Various equipment notes entered into in 2021, payable in monthly installments ranging from $3 to $8, including interest of 5.4%, maturing in February 2026. The notes are secured by equipment with a net book value of $844 as of March 31, 2021. 761 — Various commercial insurance premium financing agreements entered into in 2020, payable in monthly installments ranging from $22 to $126, including interest ranging from 3.4% to 3.8%, that matured in February and March 2021. — 453 A commercial insurance premium financing agreement entered into in 2021, payable in monthly installments of $24, including interest of 3.9%, maturing in October 2021. 167 — A $10,000 equipment line with a bank, entered into in December 2017, secured by all equipment purchased with the proceeds of the loan. Interest is calculated on any outstanding amounts using a fixed rate of 4.5%. The equipment line converted to a term loan in September 2018 with a maturity date of June 22, 2023. The term loan is secured by equipment with a net book value of $3,809 as of March 31, 2021. 5,295 5,791 Pursuant to the terms of the Third Amendment, the Closing Date Term Loan and the Delayed Draw Term Loan entered into in September 2018 as part of the Syndicated Credit Facility (see also Note 11), maturing July 2022. The interest rate applicable to the Closing Date Term Loan and the Delayed Draw Term Loan is based on a fluctuating rate of interest measured by reference to, at the Company’s election, either (i) the Eurodollar rate, currently the LIBOR rate, or (ii) an alternative base rate. With respect to the Closing Date Term Loan, principal payments required are $1,280 monthly from April 2021 through December 2021, and $1,500 monthly thereafter. The term loan is secured by substantially all the assets of the Company and is subject to certain financial covenants. 122,629 125,239 Total 144,567 148,301 Less debt issuance costs, net (860) (1,024) 143,707 147,277 Less current maturities (22,896) (22,308) Notes payable due after one year $ 120,811 $ 124,969

Mezzanine Equity

Mezzanine Equity	3 Months Ended
	Mar. 31, 2021
Temporary Equity Disclosure [Abstract]
Mezzanine Equity	Mezzanine EquityAs a condition to the Third Amendment in March 2020, the Company entered into an agreement with an investment fund affiliated with BCP to sell 26 (twenty-six thousand) shares of Series A Preferred Stock, par value $0.01 per share (the “Preferred Stock”), with an initial aggregate liquidation preference of $26,000, net of a 3% Original Issue Discount (“OID”) of $780 for net proceeds of $25,220 in a private placement (the “Preferred Stock Offering”). Proceeds from the Preferred Stock Offering were used for liquidity and general corporate purposes. In connection with the issuance of the Preferred Stock, the Company incurred direct expenses of $966, including financial advisory fees, closing costs, legal expenses and other offering-related expenses. The Preferred Stock was initially recorded net of OID and direct expenses, which will be accreted through paid-in-capital as a deemed dividend from the date of issuance through the first possible known redemption date, March 16, 2023. As of March 31, 2021 and December 31, 2020, the Company had accrued dividends of $935 and $906, respectively, associated with the Preferred Stock, which was recorded at a fair value of $2,067 and $1,356, respectively, using observable information for similar items and is classified as a level 2 fair value measurement. Dividend Rights The Preferred Stock ranks senior to the Company’s common stock with respect to dividend rights and rights on the distribution of assets in any voluntary or involuntary liquidation, dissolution or winding up of the affairs of the Company. The Preferred Stock had an initial liquidation preference of $1 (one thousand dollars) per share. The holders of the Preferred Stock are entitled to a cumulative dividend paid in cash at the rate of 10.0% per annum, payable on a quarterly basis. If we do not declare and pay a dividend to the holders of the Preferred Stock, the dividend rate will increase to 13.0% per annum, and the dividends are paid-in-kind by adding such amount to the liquidation preference. The Company’s intention is to pay dividends in-kind for the foreseeable future. The dividend rate will increase to 16.0% per annum upon the occurrence and during the continuance of an event of default. As of March 31, 2021, the liquidation preference of the Preferred Stock was $29,719. Conversion Features The Preferred Stock is convertible at the option of the holders at any time on and after the three-month anniversary of the date of issuance into shares of common stock at a conversion price of $2.77 per share (the “Conversion Price”), which represents a 30% premium to the 20-day volume-weighted average price ended March 4, 2020. As of March 31, 2021, the maximum number of common shares that could be required to be issued if converted is 10,729 (ten million seven hundred twenty-nine thousand). The conversion rate is subject to the following customary anti-dilution and other adjustments: • the issuance of common stock as a dividend or the subdivision, combination, or reclassification of common stock into a greater or lesser number of shares of common stock; • the dividend, distribution or other issuance of rights, options or warrants to holders of common stock entitling them to subscribe for or purchase shares of common stock at a price per share that is less than the market value for such issuance; • the issuance of a dividend or similar distribution in-kind, which can include shares of any class of capital stock, evidences of the Company’s indebtedness, assets or other property or securities, to holders of common stock; • a transaction in which a subsidiary of the Company ceases to be a subsidiary of the Company as a result of the distribution of the equity interests of the subsidiary to the holders of the Company’s common stock; and • the payment of a cash dividend to the holders of common stock. On or after the three-year anniversary of the date of issuance, if the holders have not elected to convert all their shares of Preferred Stock, the Company may give 30 days’ notice to the holders giving the holders the option to choose, in their sole discretion, to have all outstanding shares of Preferred Stock converted into shares of common stock or redeemed in cash at the then applicable Redemption Price (as defined below). The Company may not issue this conversion notice unless (i) the average volume-weighted average price per share of the Company’s common stock during each of the 20 consecutive trading days before the conversion is greater than 120% of the conversion price; (ii) the Company’s common stock is listed on a national securities exchange; (iii) a registration statement for the re-sale of the common stock is then effective; and (iv) the Company is not then in possession of material non-public information as determined by Regulation FD promulgated under the Exchange Act. The Preferred Stock and the associated dividend payable on March 31, 2020, did not generate a beneficial conversion feature (“BCF”) upon issuance as the fair value of the Company’s common stock was less than the conversion price. If a BCF is recognized, a reduction to paid-in capital and the Preferred Stock will be recorded and subsequently accreted through the first redemption date. Additionally, the Company determined that the nature of the Preferred Stock was more akin to an equity instrument and that the economic characteristics and risks of the embedded conversion options were clearly and closely related to the Preferred Stock. As such, the conversion options were not required to be bifurcated from the host under ASC 815, Derivatives and Hedging . Redemption Rights If the Company undergoes certain change of control transactions, the Company will be required to immediately make an offer to repurchase all of the then-outstanding shares of Preferred Stock for cash consideration per share equal to the greater of (i) 100% of the Liquidation Preference, plus accrued and unpaid dividends, if any, plus, if applicable for a transaction occurring before the third anniversary of the closing, a make-whole premium determined pursuant to a calculation of the present value of the dividends that would have accrued through such anniversary, discounted at a rate equal to the applicable treasury rate plus 0.50% (the “Make-Whole Premium”); provided that if the transaction occurs before the first anniversary of the closing, the Make-Whole Premium shall be no greater than $4,000 and (ii) the closing sale price of the common stock on the date of such redemption multiplied by the number of shares of common stock issuable upon conversion of the outstanding Preferred Stock. On or after the three-year anniversary of the issuance of the Preferred Stock, the Company may redeem the Preferred Stock, in whole or in part, for an amount in cash equal to the greater of (i) the closing sale price of the common stock on the date the Company delivers such notice multiplied by the number of shares of common stock issuable upon conversion of the outstanding Preferred Stock and (ii) (x) if the redemption occurs before the fourth anniversary of the date of the closing, 103% of the Liquidation Preference, plus accrued and unpaid dividends, or (y) if the redemption occurs on or after the fourth anniversary of the date of the closing, the Liquidation Preference plus accrued and unpaid dividends (the foregoing clauses (i) or (ii), as applicable, the “Redemption Price”). On or after the seven-year anniversary of the date of issuance, the holders have the right, subject to applicable law, to require the Company to redeem the Preferred Stock, in whole or in part, into cash consideration equal to the liquidation preference, plus all accrued and unpaid dividends, from any source of funds legally available for such purpose. Since the redemption of the Preferred Stock is contingently or optionally redeemable and therefore not certain to occur, the Preferred Stock is not required to be classified as a liability under ASC 480, Distinguishing Liabilities from Equity . As the Preferred Stock is redeemable in certain circumstances at the option of the holder and is redeemable in certain circumstances upon the occurrence of an event that is not solely within our control, we have classified the Preferred Stock in mezzanine equity in the accompanying unaudited condensed consolidated balance sheets. Liquidation Rights In the event of any liquidation, winding-up or dissolution of the Company, whether voluntary or involuntary, the holders of the Preferred Stock would receive an amount in cash equal to the greater of (i) 100% of the liquidation preference plus a Make-Whole Premium and (ii) the amount such holders would be entitled to receive at such time if the Preferred Stock were converted into Company common stock immediately before the liquidation event. The Make-Whole Premium is removed from the calculation for a liquidation event occurring after the third anniversary of the issuance date. Voting Rights The holders of the Preferred Stock are entitled to vote with the holders of the common stock on an as-converted basis in addition to voting as a separate class as provided by applicable Delaware law and the Company’s organizational documents. The holders, acting exclusively and as a separate class, shall have the right to appoint either a non-voting observer to the Company’s Board of Directors or one director to the Company’s Board of Directors. Registration Rights The holders of the Preferred Stock have certain customary registration rights with respect to the shares of common stock into which the Preferred Stock is converted, pursuant to the terms of a registration rights agreement.

Interest Rate Swap

Interest Rate Swap	3 Months Ended
	Mar. 31, 2021
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Interest Rate Swap	Interest Rate Swap To manage interest rate risk in a cost-efficient manner, the Company entered into an interest rate swap in December 2017 whereby the Company agreed to exchange with the counterparty, at specified intervals, the difference between fixed and variable interest amounts calculated by reference to a notional amount. The interest rate swap is not designated for hedge accounting. The interest rate swap is classified within other liabilities in the unaudited condensed consolidated balance sheets at March 31, 2021 and December 31, 2020 and is considered to be level 2 in the fair value hierarchy. The change in fair value of the interest rate swap is immediately recognized in earnings, within interest expense, net. As of both March 31, 2021 and December 31, 2020, the notional amount of the interest rate swap was $150,000. A fair value liability of $815 and $935 was recorded within other current liabilities in the unaudited condensed consolidated balance sheets as of March 31, 2021 and December 31, 2020, respectively. The total amount of gain (loss) included in interest expense, net in the unaudited condensed consolidated statements of operations was $120 and $(64) for the three months ended March 31, 2021 and 2020, respectively.

Contract Assets and Liabilities

Contract Assets and Liabilities	3 Months Ended
	Mar. 31, 2021
Revenue from Contract with Customer [Abstract]
Contract Assets and Liabilities	Revenue We disaggregate our revenue from customers by type of service and by geographic region as we believe it best depicts how the nature, amount, timing and uncertainty of our revenue and cash flows are affected by economic factors. See details in the tables below. Three Months Ended March 31, 2021 2020 Byproduct sales $ 15,098 $ 21,761 Construction contracts 19,939 14,847 Services 17,070 14,669 Total revenue $ 52,107 $ 51,277 Three Months Ended March 31, 2021 2020 United States $ 52,107 $ 50,642 Foreign — 635 Total revenue $ 52,107 $ 51,277 As of March 31, 2021, the Company had remaining performance obligations with an aggregate transaction price of $518,125 on construction contracts for which we recognize revenue over time. We expect to recognize approximately 20% of our remaining performance obligations as revenue during the remainder of 2021, 12% in 2022, 10% in 2023, and 59% thereafter. Revenue associated with our remaining performance obligations includes performance obligations related to our construction contracts. The balance of remaining performance obligations does not include variable consideration that was determined to be constrained as of March 31, 2021. As of March 31, 2021, we included unapproved change orders associated with project scope changes of $219 in determining the profit or loss on certain construction contracts. The timing of revenue recognition, billings and cash collections results in accounts receivable, contract assets, and contract liabilities on the unaudited condensed consolidated balance sheets. Our contract assets are as follows: March 31, 2021 December 31, 2020 Costs and estimated earnings in excess of billings $ 12,523 $ 12,196 Retainage 6,397 6,133 Total contract assets $ 18,920 $ 18,329 Our contract liabilities are as follows: March 31, 2021 December 31, 2020 Deferred revenue $ 1,440 $ 128 Billings in excess of costs and estimated earnings 29,356 6,167 Total contract liabilities $ 30,796 $ 6,295 We recognized revenue of $5,709 for the three months ended March 31, 2021 that was previously included in contract liabilities at December 31, 2020. The increase in contract liabilities was primarily due to an increase in billings in excess of costs and estimated earnings associated with billings during the three months ended March 31, 2021 for a specific remediation and compliance project. Costs and estimated earnings on uncompleted contracts are as follows: March 31, 2021 December 31, 2020 Costs incurred on uncompleted contracts $ 138,644 $ 123,339 Estimated earnings 21,332 18,425 Total costs and estimated earnings 159,976 141,764 Less billings to date (176,809) (135,735) Costs and estimated earnings in excess of billings $ (16,833) $ 6,029 The net balance in process classified on the unaudited condensed consolidated balance sheets is as follows: March 31, 2021 December 31, 2020 Costs and estimated earnings in excess of billings $ 12,523 $ 12,196 Billings in excess of costs and estimated earnings (29,356) (6,167) Net balance in process $ (16,833) $ 6,029 Anticipated losses on long-term contracts are recognized when such losses become evident. As of March 31, 2021 and December 31, 2020, accruals for anticipated losses on long-term contracts were $122 and $155, respectively.

Stock_Unit Based Compensation

Stock/Unit Based Compensation	3 Months Ended
	Mar. 31, 2021
Share-based Payment Arrangement [Abstract]
Stock/Unit Based Compensation	Stock/Unit-Based Compensation The Company adopted the Charah Solutions, Inc. 2018 Omnibus Incentive Plan (the “2018 Plan”), pursuant to which employees, consultants, and directors of the Company and its affiliates, including named executive officers, are eligible to receive awards. The 2018 Plan provides for the grant of stock options, stock appreciation rights, restricted stock, restricted stock units, bonus stock, dividend equivalents, other stock-based awards, substitute awards, annual incentive awards, and performance awards intended to align the interests of participants with those of Company's stockholders. The Company has reserved 3,007 shares of common stock for issuance under the 2018 Plan . During the three months ended March 31, 2021, the Company granted 3 restricted stock units (“RSUs”) under the 2018 Plan that vested immediately and 0 performance share units (“PSUs”). A summary of the Company’s non-vested share activity for the three months ended March 31, 2021 is as follows: Restricted Stock Performance Stock Total Shares Weighted-Average Grant Date Fair Value Shares Weighted-Average Grant Date Fair Value Shares Weighted-Average Grant Date Fair Value Balance as of December 31, 2020 981 $ 5.08 453 $ 4.02 1,434 $ 4.74 Granted 3 2.78 — — 3 2.78 Forfeited (29) 12.00 — — (29) 12.00 Vested (151) 11.82 — — (151) 11.82 Balance as of March 31, 2021 804 $ 3.56 453 $ 4.02 1,257 $ 3.72 Restricted Stock Performance Stock Total Weighted Average Remaining Contractual Terms (Years) Aggregate Intrinsic Value Weighted Average Remaining Contractual Terms (Years) Aggregate Intrinsic Value Weighted Average Remaining Contractual Terms (Years) Aggregate Intrinsic Value Balance as of December 31, 2020 0.79 $ 2,817 1.68 $ 1,299 1.07 $ 4,116 Balance as of March 31, 2021 0.57 $ 3,908 1.43 $ 2,201 0.88 $ 6,109 Stock-based compensation expense related to the restricted stock issued was $257 and $615 during the three months ended March 31, 2021 and 2020, respectively. As of March 31, 2021, total unrecognized stock-based compensation expense related to non-vested awards of restricted stock, net of estimated forfeitures, was $600, and is expected to be recognized over a weighted-average period of 1.28 years. The total fair value of awards vested for the three months ended March 31, 2021 was $736. Stock-based compensation expense related to the performance stock issued was $41 and $110 during the three months ended March 31, 2021 and 2020, respectively. As of March 31, 2021, total unrecognized stock-based compensation expense related to non-vested awards of performance stock, net of estimated forfeitures, was $598, and is expected to be recognized over a weighted-average period of 1.26 years.

Commitments and Contingencies

Commitments and Contingencies	3 Months Ended
	Mar. 31, 2021
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Commitments and Contingencies We were party to a lawsuit filed against North Carolina by an environmental advocacy group alleging that the issuance by the state of certain permits associated with our Brickhaven clay mine reclamation site exceeded the state’s power. In December 2020, the Company, the environmental advocacy group and the state settled, resolved and dismissed all matters. Before the settlement, all customer-related work at the Brickhaven site had been completed. The settlement allows for all completed work to remain unchanged. Per the settlement, the Company will not place any additional material at the site, will place a deed restriction requiring engineering oversight for the future development of the site and will continue groundwater monitoring at the site. In April 2021, the state approved the Company’s application to modify its permit to conform to the work as completed. The Company will continue its work with the state to complete the remaining site closure operations. Allied Power Services, LLC and its affiliate, Allied Power Resources, LLC, have been named in a collective action lawsuit filed in the U.S. District Court for the Northern District of Illinois, alleging violations of the Fair Labor Standards Act. This lawsuit includes related class claims alleging violations of the Illinois Minimum Wage Law and the Pennsylvania Minimum Wage Act for failure to pay overtime. This case is one of a series filed against companies in the oil, gas and energy industries in Illinois and Texas. The parties mediated this case in November 2018 and reached a settlement. As part of the Allied Transaction, the Company assumed the remaining settlement liability. On July 15, 2020, the court granted final approval of the settlement, and the final settlement payment was made in April 2021. In addition to the above matters, we are from time to time party to various lawsuits, claims and other legal proceedings that arise in the ordinary course of our business. With respect to all such lawsuits, claims and proceedings, we record reserves when it is probable a liability has been incurred, and the amount of loss can be reasonably estimated. Although it is difficult to predict the ultimate outcome of these lawsuits, claims and proceedings, we do not believe that the ultimate disposition of any of these matters, individually or in the aggregate, would have a material adverse effect on our results of operations, financial position or cash flows. We maintain liability insurance for certain risks that is subject to certain self-insurance limits. We believe amounts previously recorded are sufficient to cover any liabilities arising from the proceedings with all outstanding legal claims. Except as reflected in such accruals, we are currently unable to estimate a range of reasonably possible loss or a range of reasonably possible loss in excess of the amount accrued for outstanding legal matters.

Income Taxes

Income Taxes	3 Months Ended
	Mar. 31, 2021
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes The Company had income tax expense of $157 and $0 for the three months ended March 31, 2021 and 2020, respectively, due to adjustments to the valuation allowance on deferred tax assets. The effective income tax rate for the period was 20.1% without regard to the impact of the valuation allowance and includes the effect of state income taxes, nondeductible items and benefits for non-controlling interests. The Company’s income is subject to a federal statutory rate of 21.0% and an estimated state statutory rate of 4.2% before considering the valuation allowance. The Company evaluates its effective income tax rate at each interim period and adjusts it accordingly as facts and circumstances warrant. The determination of the annual estimated effective income tax rate at each interim period requires certain estimates and judgments including, but not limited to, the expected operating income for the year, estimated permanent differences between book and tax amounts, and the likelihood of recovering deferred tax assets generated in the current year. The accounting estimates used to compute the provision for income taxes may change as new events occur and additional information is obtained. At March 31, 2021, deferred tax liabilities, net of deferred tax assets, was $525 . A valuation allowance has been recorded for the deferred tax assets as the Company has determined that it is not more likely than not that the tax benefits related to all the deferred tax assets will be realized. The Company will continue to evaluate both the positive and negative evidence in determining the need for a valuation allowance on its deferred tax assets.

Loss Per Share

Loss Per Share	3 Months Ended
	Mar. 31, 2021
Earnings Per Share [Abstract]
Loss Per Share	Loss Per Share Basic loss per share is computed by dividing net loss attributable to the Company’s stockholders by the weighted-average number of shares outstanding during the period. Diluted loss per share reflects all potentially dilutive ordinary shares outstanding during the period and is computed by dividing net loss attributable to the Company’s stockholders by the weighted-average number of shares outstanding during the period increased by the number of additional shares that would have been outstanding as dilutive securities. Basic and diluted loss per share is determined using the following information: Three Months Ended March 31, 2021 2020 Numerator: Loss from continuing operations, net of tax and non-controlling interest $ (1,287) $ (17,293) Deemed and imputed dividends on Series A Preferred Stock (147) — Series A Preferred Stock dividends (2,067) (111) Net (loss) income from continuing operations attributable to common stockholders (3,501) (17,404) Net income (loss) from discontinued operations — 3,043 Net loss attributable to common stockholders $ (3,501) $ (14,361) Denominator: Weighted average shares outstanding 30,113 29,644 Dilutive share-based awards — — Total weighted average shares outstanding, including dilutive shares 30,113 29,644 Net (loss) income from continuing operations per common share Basic $ (0.12) $ (0.59) Diluted $ (0.12) $ (0.59) Net income (loss) from discontinued operations per common share Basic $ — $ 0.10 Diluted $ — $ 0.10 Net loss attributable to common stockholders per common share Basic $ (0.12) $ (0.48) Diluted $ (0.12) $ (0.48) The holders of the Preferred Stock have nonforfeitable rights to common stock dividends or common stock dividend equivalents. Accordingly, the Preferred Stock qualifies as participating securities. As a result of the net loss per share for the three months ended March 31, 2021 and 2020, the inclusion of all potentially dilutive shares would be anti-dilutive. Therefore, dilutive shares of 11,788 and 3,012 were excluded from the computation of the weighted-average shares for diluted net loss per share for the three months ended March 31, 2021 and 2020, respectively. A summary of securities excluded from the computation of diluted earnings per share is presented below: Three Months Ended March 31, 2021 2020 Diluted earnings per share: Anti-dilutive restricted and performance stock units 1,393 1,361 Anti-dilutive Series A Preferred Stock convertible into common stock 10,395 1,651 Potentially dilutive securities, excluded as anti-dilutive 11,788 3,012

Nature of Business and Basis _2

Nature of Business and Basis of Presentation (Policies)	3 Months Ended
	Mar. 31, 2021
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Basis of Presentation	Basis for Presentation The Company’s fiscal year ends December 31. The accompanying unaudited condensed consolidated financial statements include the assets, liabilities, stockholders’ equity and results of operations of the Company and its consolidated subsidiaries. Intercompany transactions and balances have been eliminated in consolidation. The accompanying unaudited condensed consolidated financial statements have been prepared in accordance with rules and regulations of the Securities and Exchange Commission for quarterly reports on Form 10-Q. In the opinion of management, all adjustments considered necessary for a fair presentation have been included, which consist of normal recurring adjustments. Certain information and footnote disclosures normally included in the annual financial statements prepared in accordance with U.S. generally accepted accounting principles (“GAAP”) have been condensed or omitted. The accompanying unaudited condensed consolidated financial statements should be read in conjunction with the audited consolidated and combined financial statements and notes thereto included in our Annual Report on Form 10-K for the year ended December 31, 2020.
Discontinued Operations	Discontinued Operations On November 19, 2020, the Company sold its Allied subsidiary engaged in maintenance, modification and repair services to the nuclear and fossil power generation industry to an affiliate of BCP (the “Purchaser”), the Company’s majority shareholder, in an all-cash deal for $40,000 (the “Allied Transaction”), subject to adjustments for working capital and certain other adjustments as set forth in the purchase agreement (the "Purchase Agreement"). Discontinued operations comprise those activities that were disposed of during 2020 and represent a separate major line of business that can be clearly distinguished for operational and financial reporting purposes. Accordingly, the Consolidated Balance Sheets, Statements of Operations, and the notes to consolidated financial statements reflect the Allied results as discontinued operations for all 2020 periods presented. Unless otherwise specified, disclosures in these condensed consolidated financial statements reflect continuing operations only. The consolidated statements of cash flows for the three months ended March 31, 2021 include both continuing and discontinued operations. Refer to Note 4, Discontinued Operations, for further information on the discontinued operations relating to the Allied Transaction.
Segment Information	Segment Information The Company had two reporting units, two operating segments and two reportable segments in 2019 and in 2020 through the date of the Allied Transaction, Environmental Solutions (“ES”) and Maintenance and Technical Services (“M&TS”). The Company determined that it had two reporting units because of the way the reporting units were managed. After the Allied Transaction, the Company realigned our segment reporting into a single operating segment to reflect the suite of end-to-end services we offer our utility partners and how our Chief Operating Decision Maker (“CODM”) reviews consolidated financial information to evaluate results of operations, assess performance and allocate resources. Due to the nature of the Company’s business, the Company's Chief Executive Officer who is also the CODM, evaluates the performance of the Company and allocates resources of the Company based on consolidated gross profit, general and administrative expenses, balance sheet, liquidity, capital spending, safety statistics and business development reports for the Company as a whole. Since the Company has a single operating segment, all required financial segment information can be found in the consolidated financial statements. The prior period results in the accompanying unaudited condensed consolidated statements of operations were reclassified to conform to this presentation. We provide the following services through our one segment: remediation and compliance services, byproduct sales, fossil services and ERT services. Remediation and compliance services are associated with our customers’ need for multi-year environmental improvement and sustainability initiatives, whether driven by regulatory requirements, power generation customer initiatives or consumer expectations and standards. Byproduct sales support both our power generation customers’ desire to recycle their recurring and legacy volumes of coal combustion residuals (“CCRs”), commonly known as coal ash, and our ultimate end customers’ need for high-quality, cost-effective raw material substitutes. Fossil services consist of recurring and mission-critical coal ash management and operations for coal-fired power generation facilities. ERT services represent an innovative solution designed to meet the evolving and increasingly complex needs of utility customers. These customers need to retire and decommission older or underutilized assets while maximizing the asset's value and improving the environment. Our ERT services manage the sites' environmental remediation requirements, which benefits the communities and lowers the utility customers' cost.
Business Combinations	Business Combinations On March 30, 2018, Charah Management completed a transaction with SCB Materials International, Inc. and affiliated entities (“SCB”), a previously unrelated third party, pursuant to which Charah Solutions acquired certain assets and liabilities of SCB for a purchase price of $35,000, with $20,000 paid at closing and $15,000 to be paid over time in conjunction with certain performance metrics. The contract also contained various mechanisms for a working capital true-up. The acquisition was accounted for under the acquisition method of accounting in accordance with ASC Topic 805, Business Combinations with the allocation of the purchase price for the acquisition finalized as of March 31, 2019. The recognized goodwill from the transaction was allocated to the Environmental Solutions segment. In November 2018, the $15,000 contingent consideration to be paid over time was reduced by $3,300. During the year ended December 31, 2020, the Company evaluated the recoverability of certain grinding technology assets. As part of that review, we assessed the likelihood of paying the contingent liability based on achieving certain performance sales levels using these technology assets. In the fourth quarter of 2020, the Company concluded that certain sales levels would not be achieved, and we reduced the corresponding liability by $9,702. This reduction was recognized as a component of operating income in the accompanying unaudited condensed consolidated statement of operations. As of March 31, 2021, we expect the remaining liability balance of $1,950 to be paid in 2022 and beyond. The fair value of the contingent consideration was estimated using unobservable inputs of future cash flows, which we consider to be Level 3 measurements.
Recent Accounting Pronouncements	Recent Accounting Pronouncements Recently Adopted Accounting Pronouncements In August 2020, the FASB issued ASU No. 2020-06, Debt – Debt with Conversion and Other Options (Subtopic 470-20) and Derivatives and Hedging – Contracts in Entity’s Own Equity (Subtopic 815 – 40): Accounting for Convertible Instruments and Contracts in an Entity’s Own Equity . This ASU simplifies the guidance on accounting for convertible debt instruments by removing the separation models for convertible debt with a cash conversion feature and convertible debt with a beneficial conversion feature. As a result, after adopting the ASU’s guidance, entities will not separately present in equity an embedded conversion feature in such debt. Instead, they will account for a convertible debt instrument wholly as debt and convertible preferred stock wholly as preferred stock unless certain other conditions are met. Also, the ASU requires the application of the if-converted method for calculating diluted earnings per share, and the treasury stock method will no longer be available. The Company early adopted ASU No. 2020-06, as permitted by the standard, as of January 1, 2021 with no significant impact on its consolidated financial statements. Recently Issued Accounting Pronouncements In February 2016, the FASB issued ASU No. 2016-02, Leases (Topic 842) , requiring all leases to be recognized on the balance sheet as a right-of-use asset and a lease liability, unless the lease is a short term lease (generally a lease with a term of 12 months or less). At the commencement date of the lease, the Company will recognize: (i) a lease liability for the Company’s obligation to make payments under the lease agreement, measured on a discounted basis; and (ii) a right-of-use asset that represents the Company’s right to use, or control the use of, the specified asset for the lease term. This ASU originally required recognition and measurement of leases at the beginning of the earliest period presented using a modified retrospective transition method. In July 2018, the FASB issued ASU No. 2018-11, which provided an additional (and optional) transition method that permits application of this ASU at the adoption date with recognition of a cumulative-effect adjustment to the opening balance of retained earnings in the period of adoption. In June 2020, the FASB issued ASU No. 2020-05 and delayed the effective date of this ASU, extending the effective date for non-public business entities, and making the ASU effective for the Company for the fiscal year ending December 31, 2022, and interim periods within the fiscal year ending December 31, 2023, with early adoption permitted. The Company has not yet selected a transition method and is currently evaluating the effect that the adoption of this ASU will have on its consolidated financial statements. In June 2016, the FASB issued ASU No. 2016-13, Financial Instruments - Credit Losses (Topic 326) - Measurement of Credit Losses on Financial Instruments , which introduces a new model for recognizing credit losses on financial instruments based on an estimate of current expected credit losses. The new model will apply to: (1) loans, accounts receivable, trade receivables, and other financial assets measured at amortized cost, (2) loan commitments and certain other off-balance sheet credit exposures, (3) debt securities and other financial assets measured at fair value through other comprehensive income, and (4) beneficial interests in securitized financial assets. The amendments contained in this ASU will be applied through a modified retrospective approach through a cumulative-effect adjustment to retained earnings as of the beginning of the first reporting period in which the guidance is adopted. In November 2018, the FASB issued ASU No. 2018-19, which amended the effective date of ASU No. 2016-13 and clarified that receivables arising from operating leases are not within the scope of Subtopic 326-20. In October 2019, the FASB delayed the effective date of this ASU, extending the effective date for non-public business entities and making the ASU effective for the Company for the fiscal year ending December 31, 2023, and interim periods therein, with early adoption permitted. The Company is currently evaluating the effect that the adoption of this ASU will have on its consolidated financial statements. In March 2020, the FASB issued ASU No. 2020-04, Reference Rate Reform (Topic 848) Facilitation of the Effects of Reference Rate Reform on Financial Reporting . The ASU provides optional expedients and exceptions for applying GAAP to contract modifications and hedging relationships, subject to meeting certain criteria, that reference LIBOR or another rate that is expected to be discontinued. In January 2021, the FASB issued ASU No. 2021-01, Reference Rate Reform (Topic 848). This ASU provides supplemental guidance and clarification to ASU No. 2020-04, and these updates must be adopted concurrently, cumulatively referred to as “Topic 848.” The amendments in Topic 848 are currently effective for all entities, and upon adoption, may be applied prospectively to contract modifications made on or before December 31, 2022. The Company is still assessing the impact of Topic 848 on its consolidated financial statements.

Discontinued Operations (Tables

Discontinued Operations (Tables)	3 Months Ended
	Mar. 31, 2021
Discontinued Operations and Disposal Groups [Abstract]
Disposal Groups, Including Discontinued Operations	The following amounts related to discontinued operation were derived from historical financial information and have been segregated from continuing operations and reported as discontinued operations in our accompanying unaudited consolidated statements of operations: Three Months Ended March 31, 2020 Revenue $ 113,354 Cost of sales 107,452 Gross profit 5,902 General and administrative expenses 2,088 Operating income 3,814 Interest expense, net (a) (771) Income from discontinued operations before income taxes 3,043 Income tax expense — Income from discontinued operations $ 3,043 (a) Interest expense was allocated to discontinued operations due to the requirement in Amendment No. 4 to Credit Agreement that cash generated from the Allied Transaction was used to reduce our debt balances.
Schedule of Cash and Cash Equivalents	The following table provides supplemental cash, cash equivalent and restricted cash information related to discontinued operations: Three Months Ended March 31, 2020 Cash and cash equivalents: Cash, cash equivalents and restricted cash - continuing operations $ 27,310 Cash, cash equivalents and restricted cash - discontinued operations 215 Total cash and cash equivalents $ 27,525
Depreciation and Amortization, Capital Expenditures and Significant Operating Noncash Items	The depreciation and amortization, capital expenditures and significant operating noncash items of Allied were as follows: Three Months Ended March 31, 2020 Cash flows from discontinued operating activities: Depreciation and amortization $ 197 Loss on disposal of fixed assets 22 Non-cash shared-based compensation 7 Cash flows from discontinued investing activities: Purchase of property and equipment $ 191

Asset Acquisition (Tables)

Asset Acquisition (Tables)	3 Months Ended
	Mar. 31, 2021
Asset Acquisition [Abstract]
Schedule Of Asset Acquisition	The assets acquired and liabilities assumed as recognized within the Company's condensed consolidated balance sheet upon closing on the APA consisted of the following: Consideration and direct transaction costs: Asset retirement obligations $ (50,590) Bond and insurance accrued expenses, net (2,229) Direct transaction costs (2,336) Total consideration and transaction costs incurred (55,155) Asset Received: Cash 6,354 Restricted cash 28,546 Water Rights 5,196 Land 14,385 Plant, machinery and equipment 610 Vehicles 64 Total allocated value of assets acquired $ 55,155

Revenue (Tables)

Revenue (Tables)	3 Months Ended
	Mar. 31, 2021
Revenue from Contract with Customer [Abstract]
Schedule of Disaggregation of Revenue	We disaggregate our revenue from customers by type of service and by geographic region as we believe it best depicts how the nature, amount, timing and uncertainty of our revenue and cash flows are affected by economic factors. See details in the tables below. Three Months Ended March 31, 2021 2020 Byproduct sales $ 15,098 $ 21,761 Construction contracts 19,939 14,847 Services 17,070 14,669 Total revenue $ 52,107 $ 51,277 Three Months Ended March 31, 2021 2020 United States $ 52,107 $ 50,642 Foreign — 635 Total revenue $ 52,107 $ 51,277

Balance Sheet Items (Tables)

Balance Sheet Items (Tables)	3 Months Ended
	Mar. 31, 2021
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Changes in the Allowance for Doubtful Accounts	The following table presents the changes in the allowance for doubtful accounts: Three Months Ended March 31, 2021 2020 Balance, beginning of period $ 467 $ 146 Add: provision 93 119 Less: deduction and other adjustments (2) (11) Balance, end of period $ 558 $ 254
Schedule of Property and Equipment, Net	The following table shows the components of property and equipment, net: March 31, 2021 December 31, 2020 Plant, machinery and equipment $ 68,434 $ 68,308 Structural fill site improvements 55,760 55,760 Vehicles 12,761 12,824 Office equipment 600 582 Buildings and leasehold improvements 267 262 Land, land improvements and structural fill sites 14,533 432 Capital lease assets 7,449 6,627 Construction in progress 2,249 1,961 Total property and equipment $ 162,053 $ 146,756 Less: accumulated depreciation (100,864) (97,286) Property and equipment, net $ 61,189 $ 49,470
Schedule of Capital Leased Assets	The following table shows the components of capital lease assets, net: March 31, 2021 December 31, 2020 Capital lease assets $ 7,449 $ 6,627 Less: accumulated depreciation (920) (368) Capital lease assets, net $ 6,529 $ 6,259
Schedule of Lease Receivable	The following table reflects the classification of the lease receivable within our accompanying unaudited condensed consolidated balance sheet: March 31, 2021 Lease receivable $ 5,985 Less: current portion in prepaid expenses and other current assets (294) Non-current portion in other assets $ 5,691
Schedule of Accrued Liabilities	The following table shows the components of accrued liabilities: March 31, 2021 December 31, 2020 Accrued expenses $ 11,365 $ 19,323 Accrued working capital adjustment for the Allied Transaction — 6,954 Accrued payroll and bonuses 2,430 7,227 Accrued preferred stock dividends 2,067 1,356 Accrued interest 99 77 Accrued liabilities $ 15,961 $ 34,937
Schedule of Asset Retirement Obligations	The following table reflects the activity for the asset retirement obligations: Three Months Ended March 31, 2021 2020 Balance, beginning of period $ 5,159 $ 15,131 Liabilities acquired (See Note 5) 50,590 — Liabilities settled (1,870) (2,332) Accretion 233 188 Balance, end of period 54,112 12,987 Less: current portion (18,729) (7,836) Non-current portion $ 35,383 $ 5,151

Equity Method Investment (Table

Equity Method Investment (Tables)	3 Months Ended
	Mar. 31, 2021
Equity Method Investments and Joint Ventures [Abstract]
Equity Method Investments	Summarized balance sheet information of our equity method investment entity is as follows: March 31, 2021 December 31, 2020 Current assets $ 80 $ 1,812 Noncurrent assets — 282 Total assets $ 80 $ 2,094 Current liabilities — 432 Equity of Charah 40 831 Equity of joint venture partner 40 831 Total liabilities and members’ equity $ 80 $ 2,094 Summarized financial performance of our equity method investment entity is as follows: Three Months Ended March 31, 2021 2020 Revenue $ 555 $ 1,478 Net income 404 592 Charah Solutions’ share of net income 202 296 The following table reflects our proportional ownership activity in our investment account: Three Months Ended March 31, 2021 2020 Opening balance $ 831 $ 5,078 Distributions (993) (593) Share of net income 202 296 Closing balance $ 40 $ 4,781

Goodwill and Intangible Assets

Goodwill and Intangible Assets (Tables)	3 Months Ended
	Mar. 31, 2021
Goodwill and Intangible Assets Disclosure [Abstract]
Schedule of Goodwill and Intangible Assets	The Company’s intangible assets consist of the following: March 31, 2021 December 31, 2020 Gross Carrying Amount Accumulated Amortization Net Carrying Amount Gross Carrying Amount Accumulated Amortization Net Carrying Amount Definite-lived intangibles Customer relationships $ 78,942 $ (32,806) $ 46,136 $ 78,942 $ (30,832) $ 48,110 Indefinite-lived intangibles Charah trade name 13,316 13,316 Water rights 5,196 — Total 18,512 13,316 Total $ 64,648 $ 61,426

Notes Payable (Tables)

Notes Payable (Tables)	3 Months Ended
	Mar. 31, 2021
Debt Disclosure [Abstract]
Schedule of Debt	The following table summarizes the major components of debt at each balance sheet date and provides maturities and interest rate ranges for each major category as of March 31, 2021 and December 31, 2020: March 31, 2021 December 31, 2020 Various equipment notes entered into in November 2017, payable in monthly installments ranging from $6 to $24, including interest at 5.2%, maturing in December 2022 through December 2023. The notes are secured by equipment with a net book value of $1,867 as of March 31, 2021. $ 2,596 $ 2,871 Various equipment notes entered into in 2018, payable in monthly installments ranging from $1 to $39, including interest ranging from 5.6% to 6.8%, maturing in March 2023 through May 2025. The notes are secured by equipment with a net book value of $7,239 as of March 31, 2021. 7,930 8,446 Various equipment notes entered into in 2019, payable in monthly installments ranging from $2 to $23, including interest ranging from 3.9% to 6.4%, maturing in April 2021 through December 2024. The notes are secured by equipment with a net book value of $2,784 as of March 31, 2021. 3,273 3,490 Various equipment notes entered into in 2020, payable in monthly installments ranging from $9 to $10, including interest of 5.4%, maturing in August 2025. The notes are secured by equipment with a net book value of $2,119 as of March 31, 2021. 1,916 2,011 Various equipment notes entered into in 2021, payable in monthly installments ranging from $3 to $8, including interest of 5.4%, maturing in February 2026. The notes are secured by equipment with a net book value of $844 as of March 31, 2021. 761 — Various commercial insurance premium financing agreements entered into in 2020, payable in monthly installments ranging from $22 to $126, including interest ranging from 3.4% to 3.8%, that matured in February and March 2021. — 453 A commercial insurance premium financing agreement entered into in 2021, payable in monthly installments of $24, including interest of 3.9%, maturing in October 2021. 167 — A $10,000 equipment line with a bank, entered into in December 2017, secured by all equipment purchased with the proceeds of the loan. Interest is calculated on any outstanding amounts using a fixed rate of 4.5%. The equipment line converted to a term loan in September 2018 with a maturity date of June 22, 2023. The term loan is secured by equipment with a net book value of $3,809 as of March 31, 2021. 5,295 5,791 Pursuant to the terms of the Third Amendment, the Closing Date Term Loan and the Delayed Draw Term Loan entered into in September 2018 as part of the Syndicated Credit Facility (see also Note 11), maturing July 2022. The interest rate applicable to the Closing Date Term Loan and the Delayed Draw Term Loan is based on a fluctuating rate of interest measured by reference to, at the Company’s election, either (i) the Eurodollar rate, currently the LIBOR rate, or (ii) an alternative base rate. With respect to the Closing Date Term Loan, principal payments required are $1,280 monthly from April 2021 through December 2021, and $1,500 monthly thereafter. The term loan is secured by substantially all the assets of the Company and is subject to certain financial covenants. 122,629 125,239 Total 144,567 148,301 Less debt issuance costs, net (860) (1,024) 143,707 147,277 Less current maturities (22,896) (22,308) Notes payable due after one year $ 120,811 $ 124,969

Contract Assets and Liabiliti_2

Contract Assets and Liabilities (Tables)	3 Months Ended
	Mar. 31, 2021
Revenue from Contract with Customer [Abstract]
Schedule of Asset and Liabilities	Our contract assets are as follows: March 31, 2021 December 31, 2020 Costs and estimated earnings in excess of billings $ 12,523 $ 12,196 Retainage 6,397 6,133 Total contract assets $ 18,920 $ 18,329 Our contract liabilities are as follows: March 31, 2021 December 31, 2020 Deferred revenue $ 1,440 $ 128 Billings in excess of costs and estimated earnings 29,356 6,167 Total contract liabilities $ 30,796 $ 6,295
Costs in Excess of Billings and Billings in Excess of Costs	Costs and estimated earnings on uncompleted contracts are as follows: March 31, 2021 December 31, 2020 Costs incurred on uncompleted contracts $ 138,644 $ 123,339 Estimated earnings 21,332 18,425 Total costs and estimated earnings 159,976 141,764 Less billings to date (176,809) (135,735) Costs and estimated earnings in excess of billings $ (16,833) $ 6,029 The net balance in process classified on the unaudited condensed consolidated balance sheets is as follows: March 31, 2021 December 31, 2020 Costs and estimated earnings in excess of billings $ 12,523 $ 12,196 Billings in excess of costs and estimated earnings (29,356) (6,167) Net balance in process $ (16,833) $ 6,029

Stock_Unit Based Compensation (

Stock/Unit Based Compensation (Tables)	3 Months Ended
	Mar. 31, 2021
Share-based Payment Arrangement [Abstract]
Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity	A summary of the Company’s non-vested share activity for the three months ended March 31, 2021 is as follows: Restricted Stock Performance Stock Total Shares Weighted-Average Grant Date Fair Value Shares Weighted-Average Grant Date Fair Value Shares Weighted-Average Grant Date Fair Value Balance as of December 31, 2020 981 $ 5.08 453 $ 4.02 1,434 $ 4.74 Granted 3 2.78 — — 3 2.78 Forfeited (29) 12.00 — — (29) 12.00 Vested (151) 11.82 — — (151) 11.82 Balance as of March 31, 2021 804 $ 3.56 453 $ 4.02 1,257 $ 3.72 Restricted Stock Performance Stock Total Weighted Average Remaining Contractual Terms (Years) Aggregate Intrinsic Value Weighted Average Remaining Contractual Terms (Years) Aggregate Intrinsic Value Weighted Average Remaining Contractual Terms (Years) Aggregate Intrinsic Value Balance as of December 31, 2020 0.79 $ 2,817 1.68 $ 1,299 1.07 $ 4,116 Balance as of March 31, 2021 0.57 $ 3,908 1.43 $ 2,201 0.88 $ 6,109

Loss Per Share (Tables)

Loss Per Share (Tables)	3 Months Ended
	Mar. 31, 2021
Earnings Per Share [Abstract]
Schedule of Earnings Per Share, Basic and Diluted	Basic and diluted loss per share is determined using the following information: Three Months Ended March 31, 2021 2020 Numerator: Loss from continuing operations, net of tax and non-controlling interest $ (1,287) $ (17,293) Deemed and imputed dividends on Series A Preferred Stock (147) — Series A Preferred Stock dividends (2,067) (111) Net (loss) income from continuing operations attributable to common stockholders (3,501) (17,404) Net income (loss) from discontinued operations — 3,043 Net loss attributable to common stockholders $ (3,501) $ (14,361) Denominator: Weighted average shares outstanding 30,113 29,644 Dilutive share-based awards — — Total weighted average shares outstanding, including dilutive shares 30,113 29,644 Net (loss) income from continuing operations per common share Basic $ (0.12) $ (0.59) Diluted $ (0.12) $ (0.59) Net income (loss) from discontinued operations per common share Basic $ — $ 0.10 Diluted $ — $ 0.10 Net loss attributable to common stockholders per common share Basic $ (0.12) $ (0.48) Diluted $ (0.12) $ (0.48)
Schedule of Antidilutive Securities Excluded from Computation	A summary of securities excluded from the computation of diluted earnings per share is presented below: Three Months Ended March 31, 2021 2020 Diluted earnings per share: Anti-dilutive restricted and performance stock units 1,393 1,361 Anti-dilutive Series A Preferred Stock convertible into common stock 10,395 1,651 Potentially dilutive securities, excluded as anti-dilutive 11,788 3,012

Nature of Business and Basis _3

Nature of Business and Basis of Presentation (Details) $ in Thousands	Mar. 30, 2018USD ($)	Nov. 30, 2018USD ($)	Dec. 31, 2020USD ($)	Dec. 31, 2019segment	Mar. 31, 2021USD ($)	Nov. 19, 2020USD ($)
Related Party Transaction [Line Items]
Number of reporting units | segment				2
Number of operating segments | segment				2
Number of reportable segments | segment				2
Reduction in purchase price to be paid over time			$ 9,702
Contingent payments for acquisitions			$ 1,950		$ 1,950
Discontinued Operations, Disposed of by Sale | Allied Transaction And The Reporting Units
Related Party Transaction [Line Items]
Discontinued operation, consideration						$ 40,000
SBC Materials International, Inc.
Related Party Transaction [Line Items]
Purchase price	$ 35
Payment at closing	20
Additional payment to be paid based on certain performance metrics	$ 15	$ 15
Reduction in purchase price to be paid over time		$ 3,300

Impact of the COVID-19 Pandem_2

Impact of the COVID-19 Pandemic (Details) - COVID-19 - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021	Mar. 07, 2020
Unusual or Infrequent Item, or Both [Line Items]
Payroll taxes due 2020			$ 1,637
Forecast
Unusual or Infrequent Item, or Both [Line Items]
Accrued payroll, percentage of deferred payment	50.00%	50.00%

Discontinued Operations - Narra

Discontinued Operations - Narratives (Details) - USD ($) $ in Thousands	Nov. 19, 2020	Mar. 31, 2021	Dec. 31, 2020
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Recognized credit cost of sales		$ 43
Discontinued Operations, Disposed of by Sale | Allied Transaction
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Consideration	$ 40,000
Contribution from sale of subsidiary to entity under common control	$ 25,506
Accounts receivable outstanding		118	$ 120
Proceeds from the sale of subsidiary, net of subsidiary cash			37,860
Discontinued operation transaction costs			1,900
Restricted cash			240
Liabilities assumed			3,500
Adjustments to additional paid in capital other			301
Accrued on working capital adjustments			6,954
Other transaction costs		367	$ 413
Working capital adjustment payment		$ 6,954

Discontinued Operations - Conti

Discontinued Operations - Continuing Operations and Discontinued Operations in Our Consolidated & Combined Statements of Operations (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Income from discontinued operations	$ 0	$ 3,043
Discontinued Operations, Disposed of by Sale | Allied Transaction And The Reporting Units
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Revenue		113,354
Cost of sales		107,452
Gross profit		5,902
General and administrative expenses		2,088
Operating income		3,814
Interest expense, net		(771)
Income from discontinued operations before income taxes		3,043
Income tax expense		0
Income from discontinued operations		$ 3,043

Discontinued Operations - Suppl

Discontinued Operations - Supplemental Cash, Cash Equivalent and Restricted Cash Information Related to Discontinued Operations (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020	Mar. 31, 2020	Dec. 31, 2019
Discontinued Operations and Disposal Groups [Abstract]
Cash, cash equivalents and restricted cash - continuing operations			$ 27,310
Cash, cash equivalents and restricted cash - discontinued operations			215
Total cash and cash equivalents	$ 72,338	$ 29,211	$ 27,525	$ 6,128

Discontinued Operations - Depre

Discontinued Operations - Depreciation and Amortization, Capital Expenditures and Significant Operating Noncash Items (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Cash flows from discontinued operating activities:
Non-cash shared-based compensation	$ 298	$ 732
Discontinued Operations, Disposed of by Sale | Allied Transaction And The Reporting Units
Cash flows from discontinued operating activities:
Depreciation and amortization		197
Loss on disposal of fixed assets		22
Non-cash shared-based compensation		7
Cash flows from discontinued investing activities:
Purchase of property and equipment		$ 191

Asset Acquisition - Narrative (

Asset Acquisition - Narrative (Details) - a	1 Months Ended
	Feb. 28, 2021	Mar. 31, 2021
Schedule of Asset Acquisition [Line Items]
Property redevelopment term	34 months
Structural fill site costs, inflation rate	3.00%
Asset retirement obligation, weighted average rate		4.50%
Texas Municipal Power Agency
Schedule of Asset Acquisition [Line Items]
Area of land	6,166
Gibbons Creek Steam Electric Station And Reservoir
Schedule of Asset Acquisition [Line Items]
Area of land	3,500

Asset Acquisition - Assets acqu

Asset Acquisition - Assets acquired and liabilities assumed (Details) $ in Thousands	Feb. 28, 2021USD ($)
Consideration and direct transaction costs:
Asset retirement obligations	$ (50,590)
Bond and insurance accrued expenses, net	(2,229)
Direct transaction costs	(2,336)
Total consideration and transaction costs incurred	(55,155)
Asset Received:
Cash	6,354
Restricted cash	28,546
Water Rights	5,196
Land	14,385
Plant, machinery and equipment	610
Vehicles	64
Total allocated value of assets acquired	$ 55,155

Revenue - Schedule of Disaggreg

Revenue - Schedule of Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Disaggregation of Revenue [Line Items]
Total revenue	$ 52,107	$ 51,277
United States
Disaggregation of Revenue [Line Items]
Total revenue	52,107	50,642
Foreign
Disaggregation of Revenue [Line Items]
Total revenue	0	635
Byproduct sales
Disaggregation of Revenue [Line Items]
Total revenue	15,098	21,761
Construction contracts
Disaggregation of Revenue [Line Items]
Total revenue	19,939	14,847
Services
Disaggregation of Revenue [Line Items]
Total revenue	$ 17,070	$ 14,669

Revenue - Performance Obligatio

Revenue - Performance Obligations (Details) $ in Thousands	Mar. 31, 2021USD ($)
Revenue from Contract with Customer [Abstract]
Revenue, remaining performance obligation, amount	$ 518,125
Unapproved change orders	$ 219
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-04-01
Revenue from Contract with Customer [Abstract]
Expected timing of satisfaction, period	9 months
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation, percentage	20.00%
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2022-01-01
Revenue from Contract with Customer [Abstract]
Expected timing of satisfaction, period	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation, percentage	12.00%
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2023-01-01
Revenue from Contract with Customer [Abstract]
Expected timing of satisfaction, period	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation, percentage	10.00%
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2024-01-01
Revenue from Contract with Customer [Abstract]
Expected timing of satisfaction, period
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation, percentage	59.00%

Balance Sheet Items - Allowance

Balance Sheet Items - Allowance for Doubtful Accounts (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Accounts Receivable Allowance For Doubtful Accounts [Roll Forward]
Balance, beginning of period	$ 467	$ 146
Add: provision	93	119
Less: deduction and other adjustments	(2)	(11)
Balance, end of period	$ 558	$ 254

Balance Sheet Items - Schedule

Balance Sheet Items - Schedule of Property and equipment, net (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Property, Plant and Equipment [Line Items]
Capital lease assets	$ 162,053	$ 146,756
Less: accumulated depreciation	(100,864)	(97,286)
Property and equipment, net	61,189	49,470
Plant, machinery and equipment
Property, Plant and Equipment [Line Items]
Capital lease assets	68,434	68,308
Structural fill site improvements
Property, Plant and Equipment [Line Items]
Capital lease assets	55,760	55,760
Vehicles
Property, Plant and Equipment [Line Items]
Capital lease assets	12,761	12,824
Office equipment
Property, Plant and Equipment [Line Items]
Capital lease assets	600	582
Buildings and leasehold improvements
Property, Plant and Equipment [Line Items]
Capital lease assets	267	262
Land, land improvements and structural fill sites
Property, Plant and Equipment [Line Items]
Capital lease assets	14,533	432
Capital lease assets
Property, Plant and Equipment [Line Items]
Capital lease assets	7,449	6,627
Construction in progress
Property, Plant and Equipment [Line Items]
Capital lease assets	$ 2,249	$ 1,961

Balance Sheet Items - Narrative

Balance Sheet Items - Narrative (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2021USD ($)sitetract_of_real_property	Mar. 31, 2020USD ($)	Dec. 31, 2020USD ($)	Dec. 31, 2019USD ($)
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Land improvements	$ 4,467
Depreciation	$ 4,173	$ 4,231
Sale leaseback transaction, terms	30 years
Sale Leaseback Transaction, Discount Rate	3.90%
Gain on sales-type lease	$ 5,568	0
Asset retirement obligation	$ 54,112	$ 12,987	$ 5,159	$ 15,131
Number of structural sites owned and operated | site	1
Number of tracts of real property | tract_of_real_property	4

Balance Sheet Items - Capital l

Balance Sheet Items - Capital lease assets (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Capital lease assets	$ 7,449	$ 6,627
Less: accumulated depreciation	(920)	(368)
Capital lease assets, net	$ 6,529	$ 6,259

Balance Sheet Items - Lease rec

Balance Sheet Items - Lease receivable (Details) $ in Thousands	Mar. 31, 2021USD ($)
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Lease receivable	$ 5,985
Less: current portion in prepaid expenses and other current assets	(294)
Non-current portion in other assets	$ 5,691

Balance Sheet Items - Schedul_2

Balance Sheet Items - Schedule of Accrued Liabilities (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020	Mar. 31, 2020
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Accrued expenses	$ 11,365	$ 19,323
Accrued working capital adjustment for the Allied Transaction	0	6,954
Accrued payroll and bonuses	2,430	7,227
Accrued preferred stock dividends	2,067	1,356	$ 111
Accrued interest	99	77
Accrued liabilities	$ 15,961	$ 34,937

Balance Sheet Items - Asset Ret

Balance Sheet Items - Asset Retirement Obligation (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]
Balance, beginning of period	$ 5,159	$ 15,131
Liabilities acquired	50,590	0
Liabilities settled	(1,870)	(2,332)
Accretion	233	188
Balance, end of period	54,112	12,987
Less: current portion	(18,729)	(7,836)	$ (2,043)
Non-current portion	$ 35,383	$ 5,151	$ 3,116

Equity Method Investment - Summ

Equity Method Investment - Summarized Financial Information (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020	Dec. 31, 2019
Schedule of Equity Method Investments [Line Items]
Receivable due from equity method investment	$ 2		$ 182
Current assets	143,623		105,795
Total assets	339,018		280,960
Current liabilities	106,819		84,330
Total liabilities and members’ equity	17,187	$ 39,406	20,316	$ 53,273
Net income	(1,212)	(13,896)
Charah Solutions’ share of net income	202	296
Equity method investments
Schedule of Equity Method Investments [Line Items]
Current assets	80		1,812
Noncurrent assets	0		282
Total assets	80		2,094
Current liabilities	0		432
Total liabilities and members’ equity	80		2,094
Revenue	555	1,478
Net income	404	592
Charah Solutions’ share of net income	202	$ 296
Equity of Charah | Equity method investments
Schedule of Equity Method Investments [Line Items]
Total liabilities and members’ equity	40		831
Equity of joint venture partner | Equity method investments
Schedule of Equity Method Investments [Line Items]
Total liabilities and members’ equity	$ 40		$ 831

Equity Method Investment - Owne

Equity Method Investment - Ownership (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Equity Method Investment, Proportional Ownership Activity [Roll Forward]
Opening balance	$ 831	$ 5,078
Distributions	(993)	0
Distributions	0	(593)
Share of net income	202	296
Closing balance	$ 40	$ 4,781

Related Party Transactions (Det

Related Party Transactions (Details) - USD ($)	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Related Party Transaction [Line Items]
Receivable from related parties	$ 2,000		$ 182,000
Issuance of Series A Preferred Stock, net of issuance costs (in shares)		26,000
Amendment No. 3 to Credit Agreement | Series A Preferred Stock
Related Party Transaction [Line Items]
Issuance of Series A Preferred Stock, net of issuance costs (in shares)	26,000
Affiliated Entity | ATC Group Services, LLC | Environmental Consulting and Engineering Services
Related Party Transaction [Line Items]
Expenses from transactions with related party	$ 54,000	$ 30,000
Receivable from related parties	0		0
Payable to related parties	$ 12,000		$ 29,000

Goodwill and Intangible Asset_2

Goodwill and Intangible Assets - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Goodwill and Intangible Assets Disclosure [Abstract]
Intangible asset, useful life	10 years
Amortization of intangible assets	$ 1,974	$ 2,095

Goodwill and Intangible Asset_3

Goodwill and Intangible Assets - Summary of Goodwill and Intangible Assets (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Acquired Finite-Lived Intangible Assets [Line Items]
Indefinite-lived intangibles	$ 18,512	$ 13,316
Intangible assets, net	64,648	61,426
Charah trade name
Acquired Finite-Lived Intangible Assets [Line Items]
Indefinite-lived intangibles	13,316	13,316
Water rights
Acquired Finite-Lived Intangible Assets [Line Items]
Indefinite-lived intangibles	5,196	0
Customer relationships
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	78,942	78,942
Accumulated Amortization	(32,806)	(30,832)
Net Carrying Amount	$ 46,136	$ 48,110

Credit Agreement (Details)

Credit Agreement (Details)	Aug. 13, 2019USD ($)site	Mar. 31, 2020USD ($)	Mar. 31, 2021USD ($)	Dec. 31, 2020USD ($)	Nov. 30, 2020	Sep. 30, 2020	Aug. 16, 2020	Oct. 15, 2019	Sep. 13, 2019USD ($)	Jun. 30, 2019	Sep. 21, 2018USD ($)
Debt Instrument [Line Items]
Line of credit			$ 19,085,000	$ 12,003,000
Long-term debt			143,707,000	147,277,000
Notes Payable
Debt Instrument [Line Items]
Extinguishment of debt, amount		$ 40,000
Syndicated Credit Facility | Line of Credit
Debt Instrument [Line Items]
Leverage ratio										3.75
Amendment No. 2 To Credit Agreement and Waiver | Line of Credit
Debt Instrument [Line Items]
Maximum borrowing capacity	$ 15,000,000
Interest rate		10.00%
Commitment fee percentage	3.35%
Required scheduled prepayment of outstanding loans, amount	$ 50,000,000	$ 40,000,000							$ 50,000,000
Amount outstanding, threshold for additional interest rate		10,000,000
Amendment No. 2 To Credit Agreement and Waiver | Line of Credit | LIBOR
Debt Instrument [Line Items]
Interest rate	4.00%
Amendment No. 2 To Credit Agreement and Waiver | Line of Credit | Base Rate
Debt Instrument [Line Items]
Interest rate	3.00%
Second Amendment Fee | Line of Credit
Debt Instrument [Line Items]
Credit exposure percentage	1.00%						1.00%
Second Amendment Fee | Line of Credit | Minimum
Debt Instrument [Line Items]
Credit exposure percentage								0.50%
Second Amendment Fee | Line of Credit | Maximum
Debt Instrument [Line Items]
Credit exposure percentage						1.50%
Amendment No. 3 to Credit Agreement | Line of Credit
Debt Instrument [Line Items]
Maximum borrowing capacity			25,000,000	15,000,000
Maximum capital lease indebtedness			75,000,000	50,000,000
Issuance of the preferred stock		$ 10,000,000
Commitment fee amount				$ 2,000,000
Debt issuance cost capitalized			1,623,000
Fees paid to lenders associated with extinguishment of debt			5,162,000
Write off of deferred issuance cost			3,441,000
Amendment No. 3 to Credit Agreement | Line of Credit | From December 31, 2020 through June 29, 2021
Debt Instrument [Line Items]
Leverage ratio				6.50
Amendment No. 3 to Credit Agreement | Line of Credit | From June 30, 2021 through December 30, 2021
Debt Instrument [Line Items]
Leverage ratio				6
Amendment No. 3 to Credit Agreement | Line of Credit | As of December 31, 2021 and thereafter
Debt Instrument [Line Items]
Leverage ratio				3.50
Amendment No. 3 to Credit Agreement | Line of Credit | As of December 31, 2020
Debt Instrument [Line Items]
Fixed charge coverage ratio				1
Amendment No. 3 to Credit Agreement | Line of Credit | As of March 31, 2021
Debt Instrument [Line Items]
Fixed charge coverage ratio				1.20
Third Amendment Fee | Line of Credit
Debt Instrument [Line Items]
Credit exposure percentage						0.20%
Amendment No.4 to Credit Agreement | As of December 31, 2021 and thereafter
Debt Instrument [Line Items]
Leverage ratio					3.50
Amendment No.4 to Credit Agreement | From March 31 2021 through September 29 2021 | Minimum
Debt Instrument [Line Items]
Leverage ratio					4.80
Amendment No.4 to Credit Agreement | From September 2021 Through December 30,2021 | Minimum
Debt Instrument [Line Items]
Leverage ratio					4.50
Amendment No.4 to Credit Agreement | June 31, 2021 and thereafter | Maximum
Debt Instrument [Line Items]
Fixed charge coverage ratio					1.20
Amendment No.4 to Credit Agreement | Line of Credit | Minimum
Debt Instrument [Line Items]
Fixed charge coverage ratio					1
Amendment No.4 to Credit Agreement | Line of Credit | From December 31, 2020 through March 31, 2021 | Maximum
Debt Instrument [Line Items]
Leverage ratio					5.50
Revolving Credit Facility | Syndicated Credit Facility | Line of Credit
Debt Instrument [Line Items]
Maximum borrowing capacity			50,000,000	$ 50,000,000							$ 50,000,000
Revolving Credit Facility | Amendment No. 2 To Credit Agreement and Waiver | Line of Credit
Debt Instrument [Line Items]
Unused capacity, commitment fee percentage	0.35%
Term Loan | Syndicated Credit Facility | Line of Credit
Debt Instrument [Line Items]
Maximum borrowing capacity											205,000,000
Term Loan | Amendment No. 2 To Credit Agreement and Waiver | Line of Credit
Debt Instrument [Line Items]
Interest rate						4.00%
Loan Commitment | Syndicated Credit Facility | Line of Credit
Debt Instrument [Line Items]
Maximum borrowing capacity											$ 25,000,000
Letter of Credit | Syndicated Credit Facility | Line of Credit
Debt Instrument [Line Items]
Long-term debt			$ 15,879,000	$ 11,079,000
Letter of Credit | Amendment No. 2 To Credit Agreement and Waiver | Line of Credit
Debt Instrument [Line Items]
Number of additional scheduled prepayments of outstanding loans | site	2

Notes Payable (Details)

Notes Payable (Details) - USD ($)	Mar. 31, 2021	Dec. 31, 2020
Debt Instrument [Line Items]
Total	$ 144,567,000	$ 148,301,000
Less debt issuance costs, net	(860,000)	(1,024,000)
Long-term debt	143,707,000	147,277,000
Less current maturities	(22,896,000)	(22,308,000)
Notes payable due after one year	120,811,000	124,969,000
Notes Payable | Equipment Notes Payable, 5.2% Due December 2022 and 2023
Debt Instrument [Line Items]
Total	$ 2,596,000	2,871,000
Interest rate	5.20%
Equipment net book value	$ 1,867,000
Notes Payable | Equipment Notes Payable, 5.2% Due December 2022 and 2023 | Minimum
Debt Instrument [Line Items]
Monthly installments	6,000
Notes Payable | Equipment Notes Payable, 5.2% Due December 2022 and 2023 | Maximum
Debt Instrument [Line Items]
Monthly installments	24,000
Notes Payable | Equipment Notes Payable, 5.6% to 6.8% Due March 2023 Through May 2025
Debt Instrument [Line Items]
Total	7,930,000	8,446,000
Equipment net book value	7,239,000
Notes Payable | Equipment Notes Payable, 5.6% to 6.8% Due March 2023 Through May 2025 | Minimum
Debt Instrument [Line Items]
Monthly installments	$ 1,000
Interest rate	5.60%
Notes Payable | Equipment Notes Payable, 5.6% to 6.8% Due March 2023 Through May 2025 | Maximum
Debt Instrument [Line Items]
Monthly installments	$ 39,000
Interest rate	6.80%
Notes Payable | Equipment Notes Payable, 3.9% to 6.4% Due April 2021 Through December 2024
Debt Instrument [Line Items]
Total	$ 3,273,000	3,490,000
Equipment net book value	2,784,000
Notes Payable | Equipment Notes Payable, 3.9% to 6.4% Due April 2021 Through December 2024 | Minimum
Debt Instrument [Line Items]
Monthly installments	$ 2,000
Interest rate	3.90%
Notes Payable | Equipment Notes Payable, 3.9% to 6.4% Due April 2021 Through December 2024 | Maximum
Debt Instrument [Line Items]
Monthly installments	$ 23,000
Interest rate	6.40%
Notes Payable | Equipment Notes Payable, 5.4 % Due August 2025
Debt Instrument [Line Items]
Total	$ 1,916,000	2,011,000
Interest rate	5.40%
Equipment net book value	$ 2,119,000
Notes Payable | Equipment Notes Payable, 5.4 % Due August 2025 | Minimum
Debt Instrument [Line Items]
Monthly installments	9,000
Notes Payable | Equipment Notes Payable, 5.4 % Due August 2025 | Maximum
Debt Instrument [Line Items]
Monthly installments	10,000
Term Loan | Equipment Notes Payable 5.4% Due February 2026
Debt Instrument [Line Items]
Total	$ 761,000	0
Interest rate	5.40%
Equipment net book value	$ 844,000
Term Loan | Equipment Notes Payable 5.4% Due February 2026 | Minimum
Debt Instrument [Line Items]
Monthly installments	3,000
Term Loan | Equipment Notes Payable 5.4% Due February 2026 | Maximum
Debt Instrument [Line Items]
Monthly installments	8,000
Line of Credit | 3.4% Commercial Insurance Premium
Debt Instrument [Line Items]
Total	0	453,000
Line of Credit | 3.4% Commercial Insurance Premium | Minimum
Debt Instrument [Line Items]
Monthly installments	$ 22,000
Interest rate	3.40%
Line of Credit | 3.4% Commercial Insurance Premium | Maximum
Debt Instrument [Line Items]
Monthly installments	$ 126,000
Interest rate	0.038%
Line of Credit | Equipment Notes Payable 3.9 % Due October 2021
Debt Instrument [Line Items]
Total	$ 167,000	0
Monthly installments	$ 24,000
Interest rate	3.90%
Line of Credit | 4.5% Equipment Line Of Credit
Debt Instrument [Line Items]
Total	$ 5,295,000	5,791,000
Long-term debt	$ 3,809,000
Interest rate	4.50%
Initial commitment	$ 10,000,000
Line of Credit | Syndicated Credit Facility
Debt Instrument [Line Items]
Total	122,629,000	$ 125,239,000
Line of Credit | Syndicated Credit Facility | Period 1
Debt Instrument [Line Items]
Long-term debt	1,280,000
Line of Credit | Syndicated Credit Facility | Period 2
Debt Instrument [Line Items]
Long-term debt	$ 1,500,000

Mezzanine Equity (Details)

Mezzanine Equity (Details)	3 Months Ended
	Mar. 31, 2021USD ($)trading_day$ / sharesshares	Mar. 31, 2020USD ($)shares	Dec. 31, 2020USD ($)$ / shares	Mar. 04, 2020$ / shares
Temporary Equity [Line Items]
Issuance of Series A Preferred Stock, net of issuance costs (in shares) | shares		26,000
Series A Preferred Stock, par value (in dollars per share) | $ / shares	$ 0.01		$ 0.01
Series A Preferred Stock dividends payable included in accrued expenses	$ 2,067,000	$ 111,000	$ 1,356,000
Liquidation preference (in dollars per share) | $ / shares	$ 1,000
Dividend in cash, liquidation preference percentage	10.00%
Dividend other than cash, liquidation preference percentage	13.00%
Dividend other than cash, liquidation preference percentage, upon default	16.00%
Series A Preferred Stock, aggregate liquidation preference	$ 29,719,000		28,783,000
Debt Instrument, Convertible, Conversion Term	3 months
Conversion price (in dollars per share) | $ / shares				$ 2.77
Weighted average price percentage of preferred stock	30.00%
Common stock issuable if preferred stock is converted (in shares) | shares	10,729,000
Threshold trading days | trading_day	30
Threshold consecutive trading days | trading_day	20
Conversion price, percentage	120.00%
Conversion price, upon change of control	100.00%
Dividend discount spread on treasury rate	0.50%
Make whole payment, maximum	$ 4,000,000
Conversion price, upon early redemption	103.00%
Series A Preferred Stock
Temporary Equity [Line Items]
Debt Instrument, Convertible, Conversion Term	3 years
Series A Preferred Stock | Period 1
Temporary Equity [Line Items]
Debt Instrument, Convertible, Conversion Term	3 years
Series A Preferred Stock | Period 2
Temporary Equity [Line Items]
Debt Instrument, Convertible, Conversion Term	7 years
Amendment No. 3 to Credit Agreement | Series A Preferred Stock
Temporary Equity [Line Items]
Issuance of Series A Preferred Stock, net of issuance costs (in shares) | shares	26,000
Series A Preferred Stock, par value (in dollars per share) | $ / shares	$ 0.01
Original issue discount, rate	3.00%
Amendment No. 3 to Credit Agreement | Series A Preferred Stock | Private Placement
Temporary Equity [Line Items]
Proceeds from issuance, net of discount	$ 26,000,000
Original issue discount, amount	780,000
Proceeds from private placement	25,220,000
Payments of stock issuance costs	966,000
Series A Preferred Stock dividends payable included in accrued expenses	$ 935,000		$ 906,000

Interest Rate Swap (Details)

Interest Rate Swap (Details) - Interest Rate Swap - Not Designated as Hedging Instrument - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Derivatives, Fair Value [Line Items]
Derivative, notional amount	$ 150		$ 150
Gain (loss) on derivative	120	$ (64)
Other Liabilities
Derivatives, Fair Value [Line Items]
Derivative liability, fair value	$ (815)		$ (935)

Contract Assets and Liabiliti_3

Contract Assets and Liabilities - Schedule of Asset and Liabilities (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Dec. 31, 2020
Contract with Customer, Asset, after Allowance for Credit Loss, Current [Abstract]
Costs and estimated earnings in excess of billings	$ 12,523	$ 12,196
Retainage	6,397	6,133
Total contract assets	18,920	18,329
Contract with Customer, Liability [Abstract]
Deferred revenue	1,440	128
Billings in excess of costs and estimated earnings	29,356	6,167
Total contract liabilities	30,796	$ 6,295
Revenue recognized	$ 5,709

Contract Assets and Liabiliti_4

Contract Assets and Liabilities - Activity (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Revenue from Contract with Customer [Abstract]
Costs incurred on uncompleted contracts	$ 138,644	$ 123,339
Estimated earnings	21,332	18,425
Total costs and estimated earnings	159,976	141,764
Less billings to date	(176,809)	(135,735)
Costs and estimated earnings in excess of billings	$ (16,833)	$ 6,029

Contract Assets and Liabiliti_5

Contract Assets and Liabilities - Balance Sheet Classification (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Revenue from Contract with Customer [Abstract]
Costs and estimated earnings in excess of billings	$ 12,523	$ 12,196
Billings in excess of costs and estimated earnings	(29,356)	(6,167)
Costs and estimated earnings in excess of billings	(16,833)	6,029
Long-term contracts, loss accrual	$ 122	$ 155

Stock_Unit Based Compensation -

Stock/Unit Based Compensation - Narrative (Details) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares reserved for future issuance (in shares)	3,007
Granted in period (in shares)	3
Fair value of awards vested during period	$ 736
Restricted Stock Units (RSU)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted in period (in shares)	3
Compensation expense	$ 257	$ 615
Unrecognized compensation cost	$ 600
Compensation cost not yet recognized, period for recognition	1 year 3 months 10 days
Performance Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted in period (in shares)	0
Compensation expense	$ 41	$ 110
Unrecognized compensation cost	$ 598
Compensation cost not yet recognized, period for recognition	1 year 3 months 3 days

Stock_Unit Based Compensation_2

Stock/Unit Based Compensation - Stock Activity (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2021	Dec. 31, 2020
Shares
Beginning balance (in shares)	1,434
Granted (in shares)	3
Forfeited (in shares)	(29)
Vested (in shares)	(151)
Ending balance (in shares)	1,257	1,434
Weighted-Average Grant Date Fair Value
Beginning balance (in dollars per share)	$ 4.74
Granted (in dollars per share)	2.78
Forfeited (in dollars per share)	12
Vested (in dollars per share)	11.82
Ending balance (in dollars per share)	$ 3.72	$ 4.74
Weighted Average Remaining Contractual Terms (Years)	10 months 17 days	1 year 25 days
Aggregate Intrinsic Value	$ 6,109	$ 4,116
Restricted Stock
Shares
Beginning balance (in shares)	981
Granted (in shares)	3
Forfeited (in shares)	(29)
Vested (in shares)	(151)
Ending balance (in shares)	804	981
Weighted-Average Grant Date Fair Value
Beginning balance (in dollars per share)	$ 5.08
Granted (in dollars per share)	2.78
Forfeited (in dollars per share)	12
Vested (in dollars per share)	11.82
Ending balance (in dollars per share)	$ 3.56	$ 5.08
Weighted Average Remaining Contractual Terms (Years)	6 months 25 days	9 months 14 days
Aggregate Intrinsic Value	$ 3,908	$ 2,817
Performance Stock
Shares
Beginning balance (in shares)	453
Granted (in shares)	0
Forfeited (in shares)	0
Vested (in shares)	0
Ending balance (in shares)	453	453
Weighted-Average Grant Date Fair Value
Beginning balance (in dollars per share)	$ 4.02
Granted (in dollars per share)	0
Forfeited (in dollars per share)	0
Vested (in dollars per share)	0
Ending balance (in dollars per share)	$ 4.02	$ 4.02
Weighted Average Remaining Contractual Terms (Years)	1 year 5 months 4 days	1 year 8 months 4 days
Aggregate Intrinsic Value	$ 2,201	$ 1,299

Income Taxes (Details)

Income Taxes (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Income Tax Disclosure [Abstract]
Income tax expense	$ 157	$ 0
Effective tax rate	20.10%
Statutory tax rate	21.00%
Statutory tax rate prior to valuation allowance	4.20%
Deferred tax liabilities	$ 525		$ 368

Loss Per Share - Calculation of

Loss Per Share - Calculation of EPS (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Numerator:
Loss from continuing operations, net of tax and non-controlling interest	$ (1,287)	$ (17,293)
Deemed and imputed dividends on Series A Preferred Stock	(147)	0
Series A Preferred Stock dividends	(2,067)	(111)
Net loss from continuing operations attributable to common stockholders	(3,501)	(17,404)
Income from discontinued operations, net of tax	0	3,043
Net loss attributable to common stockholders	$ (3,501)	$ (14,361)
Denominator:
Weighted-average shares outstanding (in shares)	30,113	29,644
Dilutive share-based awards (in shares)	0	0
Total weighted average shares outstanding, including dilutive shares (in shares)	30,113	29,644
Net (loss) income from continuing operations per common share
Basic (in dollars per share)	$ (0.12)	$ (0.59)
Diluted (in dollars per share)	(0.12)	(0.59)
Net income (loss) from discontinued operations per common share
Basic (in dollars per share)	0	0.10
Diluted (in dollars per share)	0	0.10
Net loss attributable to common stockholders per common share
Basic loss per share (in dollars per share)	(0.12)	(0.48)
Diluted loss per share (in dollars per share)	$ (0.12)	$ (0.48)

Loss Per Share - Antidilutive S

Loss Per Share - Antidilutive Securities (Details) - shares shares in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Anti-dilutive restricted and performance stock units (in shares)	11,788	3,012
Anti-dilutive restricted and performance stock units
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Anti-dilutive restricted and performance stock units (in shares)	1,393	1,361
Anti-dilutive Series A Preferred Stock convertible into common stock
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Anti-dilutive restricted and performance stock units (in shares)	10,395	1,651

Uncategorized Items - chra-2021

Label	Element	Value
Deferred Offering Costs	us-gaap_DeferredOfferingCosts	$ 0
Deferred Offering Costs	us-gaap_DeferredOfferingCosts	996,000
Debt Issuance Costs, Gross, Current	us-gaap_DeferredFinanceCostsCurrentGross	0
Debt Issuance Costs, Gross, Current	us-gaap_DeferredFinanceCostsCurrentGross	$ 579,000