0001193125-21-191227 | 10-Q/A | XBRL Viewer

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Cover Page - shares	3 Months Ended
Cover Page - shares	Mar. 31, 2021	Apr. 30, 2021
Document Information [Line Items]
Document Type	10-Q/A
Amendment Flag	true
Document Quarterly Report	true
Document Transition Report	false
Document Period End Date	Mar. 31, 2021
Document Fiscal Year Focus	2021
Document Fiscal Period Focus	Q1
Current Fiscal Year End Date	--12-31
Entity Registrant Name	MONTAUK RENEWABLES, INC.
Entity File Number	001-39919
Entity Incorporation, State or Country Code	DE
Entity Interactive Data Current	Yes
Entity Current Reporting Status	Yes
Entity Shell Company	false
Entity Filer Category	Non-accelerated Filer
Entity Tax Identification Number	85-3189583
Entity Small Business	false
Entity Emerging Growth Company	true
Entity Address, Address Line One	680 Andersen Drive
Entity Address, Address Line Two	5th Floor Pittsburgh
Entity Address, State or Province	PA
Entity Address, City or Town	Pittsburgh
Entity Address, Postal Zip Code	15220
City Area Code	412
Local Phone Number	747-8700
Title of 12(b) Security	Common Stock, par value $0.01 per share
Trading Symbol	MNTK
Security Exchange Name	NASDAQ
Entity Common Stock, Shares Outstanding		142,157,835
Entity Central Index Key	0001826600
Entity Ex Transition Period	false
Amendment Description	This Amendment No. 1 on Form 10-Q/A (this “Amendment”) amends Montauk Renewables, Inc.’s Quarterly Report on Form 10-Q for the period ended March 31, 2021 (the “Form 10-Q”) originally filed with the Securities and Exchange Commission on May 17, 2021. This Amendment is being filed, under the permitted 30 day grace period, solely to include omitted Inline eXtensible Business Reporting Language (iXBRL). Interactive Data Files have been added as Exhibit 101 to this Amendment. Additionally, this filing includes updated Chief Executive Officer and Chief Financial Officer certifications filed as Exhibits 31.1, 31.2, 32.1, and 32.2. No other changes have been made to the Form 10-Q. This Amendment does not reflect events that may have occurred subsequent to the original filing date, and does not modify or update in any way the disclosures made in the originally filed Form 10-Q.

Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Current assets:
Cash and cash equivalents	$ 22,643	$ 20,992
Accounts and other receivables, net	6,905	5,449
Prepaid expenses and other current assets	1,901	6,044
Total current assets	31,449	32,485
Restricted cash - non-current	572	567
Property, plant and equipment, net	182,309	187,046
Related party receivable	7,140
Goodwill and intangible assets, net	13,742	14,033
Deferred tax assets	13,756	14,822
Operating lease right-of-use assets	515	586
Other assets	3,879	3,817
Total assets	253,362	253,356
Current liabilities:
Accounts payable	5,520	5,964
Accrued liabilities	9,555	11,539
Current portion of lease liability	284	282
Income taxes payable	75
Current portion of derivative instruments	1,061	1,185
Current portion of long-term debt	9,536	9,492
Total current liabilities	26,031	28,462
Long-term debt, less current portion	53,863	56,268
Non-current portion of lease liability	249	320
Non-current portion of derivative instruments	781	1,075
Asset retirement obligation	5,783	5,689
Other liabilities	1,920	1,920
Total liabilities	88,627	93,734
STOCKHOLDERS' AND MEMBERS' EQUITY
Members' equity		159,622
Common stock, $0.01 par value, authorized 690,000,000 shares; 142,157,835 shares issued at March 31, 2021; 141,015,213 shares outstanding at March 31, 2021	1,410
Treasury stock, at cost, 950,214 shares at March 31, 2021	(10,813)
Additional paid-in capital	188,403
Retained deficit	(14,265)
Total stockholders' and members' equity	164,735	159,622
Total liabilities and stockholders' and members' equity	$ 253,362	$ 253,356

Condensed Consolidated Balance Sheets (Parenthetical)	Mar. 31, 2021 $ / shares shares
Statement of Financial Position [Abstract]
Common stock par or stated value per share \| $ / shares	$ 0.01
Common stock shares authorized	690,000,000
Common stock shares issued	142,157,835
Common stock shares outstanding	141,015,213
Treasury stock shares	950,214

Condensed Consolidated Statements of Operations - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Income Statement [Abstract]
Total operating revenues	$ 31,447	$ 18,403
Operating expenses:
Operating and maintenance expenses	10,612	9,836
General and administrative expenses	20,452	3,439
Royalties, transportation, gathering and production fuel	6,218	2,941
Depreciation, depletion and amortization	5,737	5,348
Gain on insurance proceeds	(82)	(656)
Impairment loss	626	278
Transaction costs	88
Total operating expenses	43,651	21,186
Operating loss	(12,204)	(2,783)
Other expenses (income):
Interest expense	646	2,214
Other expense (income)	33	(26)
Total other expenses	679	2,188
Loss before income taxes	(12,883)	(4,971)
Income tax expense (benefit)	1,382	(10,787)
Net income (loss)	$ (14,265)	$ 5,816
Loss per share:
Basic	$ (0.10)
Diluted	$ (0.10)
Weighted-average common shares outstanding:
Basic	141,015,213
Diluted	141,015,213

Condensed Consolidated Statements of Stockholders' and Members' Equity - USD ($) $ in Thousands	Total	Common Stock [Member]	Treasury Stock [Member]	Members Equity [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]
Beginning balance at Dec. 31, 2019	$ 154,257			$ 154,257
Net income (loss)	5,816			5,816
Stock-based compensation	230			230
Ending balance at Mar. 31, 2020	160,303			160,303
Beginning balance at Dec. 31, 2020	159,622			159,622
Net income (loss)	(14,265)					$ (14,265)
Stock-based compensation	14,598				$ 14,598
Effect of Reorganization Transactions		$ 1,383		$ (159,622)	158,239
Effect of Reorganization Transactions, shares		138,312,713
IPO common stock	$ 15,593	$ 27			15,566
IPO common stock, shares		2,702,500
Treasury stock	(10,813)		(10,813)
Treasury stock, shares			$ 950,214
Ending balance at Mar. 31, 2021	$ 164,735	$ 1,410	$ (10,813)		$ 188,403	$ (14,265)
Ending balance, shares at Mar. 31, 2021		141,015,213	950,214

Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Cash flows from operating activities:
Net income (loss)	$ (14,265)	$ 5,816
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation, depletion and amortization	5,737	5,334
Provision (benefit) for deferred income taxes	1,066	(10,787)
Stock-based compensation	14,598	230
Related party receivables		164
Derivative mark-to-market and settlements	(418)	1,801
Gain on property insurance proceeds	(82)
Accretion of asset retirement obligations	138	84
Amortization of debt issuance costs	137	187
Impairment loss	626	278
Changes in operating assets and liabilities:
Accounts and other receivables and other current assets	2,634	735
Accounts payable and other accrued expenses	(2,402)	(2,674)
Net cash provided by operating activities	7,769	1,168
Cash flows from investing activities
Capital expenditures	(1,335)	(5,204)
Proceeds from insurance recovery	82
Net cash used in investing activities	(1,253)	(5,204)
Cash flows from financing activities:
Borrowings of long-term debt		8,500
Repayments of long-term debt	(2,500)	(2,500)
Proceeds from initial public offering	15,593
Treasury stock purchase	(10,813)
Loan to Montauk Holdings Limited	(7,140)
Net cash (used in) provided by financing activities	(4,860)	6,000
Net increase in cash and cash equivalents and restricted cash	1,656	1,964
Cash and cash equivalents and restricted cash at beginning of period	21,559	10,361
Cash and cash equivalents and restricted cash at end of period	23,215	12,325
Reconciliation of cash, cash equivalents, and restricted cash at end of period:
Cash and cash equivalents	22,643	11,738
Restricted cash and cash equivalents - current		20
Restricted cash and cash equivalents - non-current	572	567
Cash and cash equivalents and restricted cash at end of period	$ 23,215	$ 12,325

Description of Business	3 Months Ended
Description of Business	Mar. 31, 2021
Accounting Policies [Abstract]
Description of Business	NOTE 1 – DESCRIPTION OF BUSINESS Operations and organization Montauk Renewables’ Business Montauk Renewables, Inc. (the “Company” or “Montauk Renewables”) is a renewable energy company specializing in the management, recovery and conversion of biogas into Renewable Natural Gas (“RNG”). The Company captures methane, preventing it from being released into the atmosphere, and converts it into either RNG or electrical power for the electrical grid (“Renewable Electricity”). The Company, headquartered in Pittsburgh, Pennsylvania, has more than 30 years of experience in the development, operation and management of landfill methane-fueled renewable energy projects. The Company has current operations at 15 operating projects located in California, Idaho, Ohio, Oklahoma, Pennsylvania and Texas. The Company sells RNG and Renewable Electricity, taking advantage of Environmental Attribute premiums available under federal and state policies that incentivize their use. One of the Company’s key revenue drivers is the selling of captured gas and the selling of Renewable Identification Numbers (“RINs”) to fuel blenders. The Renewable Fuel Standard (“RFS”) is an Environmental Protection Agency (“EPA”) administered federal law that requires transportation fuel to contain a minimum volume of renewable fuel. RNG derived from landfill methane, agricultural digesters and wastewater treatment facilities used as a vehicle fuel qualifies as a D3 (cellulosic biofuel with a 60% greenhouse gas reduction requirement) RIN. The RINs are compliance units for fuel blenders that were created by the RFS program in order to reduce greenhouse gases and imported petroleum into the United States. An additional program utilized by the Company is the Low Carbon Fuel Standard (“LCFS”). This is state specific and is designed to stimulate the use of low-carbon fuels. To the extent that RNG from the Company’s facilities is used as a transportation fuel in states that have adopted an LCFS program, it is eligible to receive an Environmental Attribute additional to the RIN value under the federal RFS. The second primary revenue driver is the selling of captured electricity and the associated environmental premiums related to renewable sales. The Company’s electric facilities are designed to conform to and monetize various state renewable portfolio standards requiring a percentage of the electricity produced in that state to come from a renewable resource. Such premiums are in the form of Renewable Energy Credits (“RECs”). All three of the Company’s electric facilities receive revenue for the monetization of RECs either as a part of a power sales agreement or separately. Collectively, the Company benefits from federal, state and local government incentives in the United States, provided in the form of RINs, RECs, LCFS credits, rebates, tax credits and other incentives to end users, distributors, system integrators and manufacturers of renewable energy projects, that promote the use of renewable energy, as Environmental Attributes. Background and Reorganization Transactions On January 4, 2021, the Company, Montauk Holdings Limited (“MNK”) and Montauk Holdings USA, LLC (a direct wholly-owned subsidiary of MNK at the time, “Montauk USA”) entered into a series of transactions, including an equity exchange and a distribution collectively referred to as the “Reorganization Transactions,” that resulted in the Company owning all of the assets and entities (other than Montauk USA) previously owned by Montauk USA and Montauk Renewables became a direct wholly-owned subsidiary of MNK. Prior to the Reorganization Transactions, MNK’s business and operations were conducted entirely through Montauk USA and its U.S. subsidiaries, and MNK held no substantial assets other than equity of Montauk USA. The Company had no significant operations or assets prior to January 4, 2021 when it engaged in the equity exchange with Montauk USA and MNK. After completion of the Reorganization Transactions, (i) Montauk USA ceased to own any substantial assets and (ii) all entities through which MNK’s business and operations were conducted became owned, directly or indirectly, by the Company. MNK adopted a plan contemporaneously with the completion of the Reorganization Transactions that authorized the liquidation and dissolution of MNK. On January 15, 2021, MNK sold the membership interest of Montauk USA to a third party. On January 26, 2021, MNK distributed all of the outstanding shares of the Company’s common stock as a pro rata dividend to the holders of MNK’s ordinary shares (the “Distribution”), subject to any tax withholding obligations under applicable South African law. Each ordinary share of MNK outstanding on January 21, 2021, the record date for the Distribution (the “Record Date”), entitled the holder thereof to receive one share of the Company’s common stock. On January 26, 2021, the Company closed the initial public offering of its common stock on the Nasdaq Capital Market (the “IPO”) with the shares traded under the symbol “MNTK.” Montauk Renewables issued 2,702,500 shares at $8.50 per share and received gross proceeds of $22,971. The Company’s common stock was also secondarily listed on the Johannesburg Stock Exchange under the trading symbol “MKR.” On January 26, 2021, the Company entered into a Loan Agreement and Secured Promissory Note (the “Initial Promissory Note”) with MNK. MNK is currently an affiliate of the Company and all of the Company’s directors and certain of the Company’s executive officers are also directors and executive officers of MNK. Pursuant to the Initial Promissory Note, the Company advanced a cash loan of $5,000 to MNK for MNK to pay its dividends tax liability arising from the Reorganization Transactions under the South African Income Tax Act, 1962 (Act No. 58 of 1962), as amended. On February 22, 2021, the Company and MNK entered into an Amended and Restated Promissory Note (the “Amended Promissory Note”) to increase the principal amount of the loan to a total of $7,140, in the aggregate, in accordance with the Company’s obligations set forth in the Transaction Implementation Agreement entered into by and among the Company, MNK and the other party thereto, dated November 6, 2020, and amended on January 14, 2021. MNK was delisted from the JSE on January 26, 2021. MNK will be liquidated within 24 months of the Distribution. COVID-19 In March 2020, the World Health Organization classified the outbreak of COVID-19 as a pandemic and recommended containment and mitigation measures worldwide. The Company is considered an essential company under the U.S. Federal Cybersecurity and Infrastructure Security Agency guidance and various state or local jurisdictions in which we operate. In response to the COVID-19 pandemic, the Infectious Disease and Response Plan was activated to lead the development and response to any infectious disease event. Although the Company has not experienced any material disruptions in its ability to continue its business operations or a material impact to its financial results to date due to COVID-19, the potential future impact cannot be predicted with certainty. Although the Company is unable to predict the ultimate effects of the COVID-19 pandemic, the pandemic has adversely affected the Company’s business, financial condition and results of operations. The spread of COVID-19 has disrupted certain aspects of the Company’s operations, including commissioning of development sites which were delayed up to five months in 2020 resulting in delays to registrations and qualifications necessary for EPA pathways and delays in revenue streams from these facilities, contract cancellations, and a decrease in operational efficiency in maintenance and operations. State and local mitigation protocols have contributed to reduced needs for transportation fuels, which has lowered and could continue to lower state-based environmental premiums. During 2020, the Company also faced a reduction in RINs pricing due to the outbreak of COVID-19. During the first quarter of 2021, RIN pricing recovered and increased from the temporary reduction experienced in 2020.

Summary of Significant Accounting Policies	3 Months Ended
Summary of Significant Accounting Policies	Mar. 31, 2021
Accounting Policies [Abstract]
Summary of Significant Accounting Policies	NOTE 2 – SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES Basis of Presentation The accompanying unaudited condensed consolidated financial statements have been prepared in accordance with accounting principles generally accepted in the United States (“GAAP”) for interim financial information and with the instructions of the SEC on Form 10-Q and Rule 10-01 of Regulation S-X. Accordingly, they do not include all of the information and disclosures required by GAAP for complete financial statements. In the opinion of management, the condensed consolidated financial statements include all adjustments necessary, which are of a normal and recurring nature, for the fair presentation of the Company’s financial position and of the results of operations and cash flows for the periods presented. These financial statements should be read in conjunction with the audited consolidated financial statements and notes thereto for the year ended December 31, 2020 included in the Company’s Annual Report on Form 10-K filed with the SEC on March 31, 2021 (the “2020 Annual Report”). The results of operations for the three months ended March 31, 2021 in this report are not necessarily indicative of the results that may be expected for any other interim period or for the full year. The balance sheet at December 31, 2020, has been derived from the audited financial statements as of that date. For further information, refer to our audited financial statements and notes thereto included for the year ended December 31, 2020 in the 2020 Annual Report. The historical consolidated financial information included reflects the historical results of operations and financial position of Montauk USA. The consolidated financial statements of Montauk USA, became our historical financial statements following the IPO. Certain historical financial information included relates to periods prior to the Reorganization Transactions. Retrospective Presentation of Ownership Exchange As discussed in Note 1, as a result of the Reorganization Transactions, the Company acquired the assets and entities (excluding Montauk USA) which were previously owned by MNK. As part of the Reorganization Transactions, a 1:1 pro rata exchange of shares of the Company’s common stock was made to holders of MNK’s ordinary shares. The Reorganization Transactions resulted in a pro rata exchange whereby the ownership of the Company after the Reorganization Transactions was identical to the ownership of MNK prior to the Reorganization Transaction and was therefore akin to a common control transaction. All members’ equity in the financial statements and notes have been retrospectively adjusted to give effect to the 1:1 ratio, as if such pro rata exchange occurred as of all pre-IPO periods presented, including periods presented on the Condensed Consolidated Balance Sheets, Condensed Consolidated Statements of Operations, Consolidated Statements of Stockholders’ and Members’ Equity and notes to the Condensed Consolidated Financial Statements contained herein. Use of Estimates The preparation of financial statements, in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. Actual results could differ from those estimates. Equity-Based Compensation The Company accounts for equity-based compensation under the provisions of ASC 718, Compensation – Stock Compensation , (“ ASC 718 ”). ASC 718 requires compensation costs related to share-based payment transactions, measured based on the fair value of the instruments issued, be recognized in the consolidated financial statements over the requisite service period of the award. Stock options are initially measured on the grant date using the Black-Scholes valuation model, which requires the use of subjective assumptions related to the expected stock price volatility, term, risk-free interest rate and dividend yield. For restricted stock and restricted stock units, the Company determines the grant date fair value based on the closing market price of the stock on the date of the grant. Recently Issued Accounting Standards In June 2016, the FASB issued ASU No. 2016-13, Financial Instruments – Credit Losses . The new guidance changes how entities measure credit losses on financial instruments and the timing of when such losses are recorded. The new standard is effective for fiscal years beginning after December 15, 2022, with early adoption is permitted. The Company is currently evaluating the impact this ASU will have on its consolidated financial statements and related disclosures. In August 2020, the FASB issued ASU 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) , which simplifies the accounting for convertible instruments and contracts in an entity’s own equity. This guidance is effective for annual reporting periods beginning after December 15, 2021, including interim periods within those years, with early adoption permitted only as of annual reporting periods beginning after December 15, 2020. The Company is currently assessing the impact this standard will have on its consolidated financial statements or related financial statement disclosures. In March 2020, the FASB issued ASU No. 2020-04, Reference Rate Reform (Topic 848) , which provides optional expedients and exceptions to the current guidance on contract modifications and hedging relationships to ease the financial reporting burdens of the expected market transition from London Interbank Offered Rate (“LIBOR”) and other interbank offered rates to alternative reference rates. The guidance was effective upon issuance and may be applied prospectively to contract modifications made and hedging relationships entered into or evaluated on or before December 31, 2022. The Company does not currently anticipate this impact to have a material effect on our agreements, but is working with the administrative agent during the LIBOR transition.

Asset Impairment	3 Months Ended
Asset Impairment	Mar. 31, 2021
Asset Impairment Charges [Abstract]
Asset Impairment	NOTE 3 – ASSET IMPAIRMENT The Company recorded an impairment loss of $626 for the three months ended March 31, 2021 in the Renewable Electricity Generation segment. The impairment loss was due to a notice received from a landfill host in February 2021 amending the underlying gas rights agreement to remove and begin decommissioning activities related to one of the Company’s renewable electric generation sites. For the three months ended March 31, 2020, the Company calculated and recorded an impairment loss of $278. The loss was due to a termination of a development agreement. The Company evaluated and concluded that no other triggering events were indicated during the period that suggested long-lived assets may not be recoverable.

Revenues from Contracts with Customers

3 Months Ended

Mar. 31, 2021

Revenue from Contract with Customer [Abstract]

Revenues from Contracts with Customers

NOTE 4 – REVENUES FROM CONTRACTS WITH CUSTOMERS

The following tables display the Company’s revenue by major source, excluding realized and unrealized gains or losses under the Company’s gas hedge program, based on product type and timing of transfer of goods and services for the three months ended March 31, 2021 and 2020:


	Three Months Ended March 31, 2021
	Goods transferred at a point in time		Goods transferred over time		Total
Major Goods/Service Line:
Natural Gas Commodity	$	3,976	$	6,695	$	10,671
Natural Gas Environmental Attributes		17,452		—		17,452
Electric Commodity		—		2,273		2,273
Electric Environmental Attributes		1,051		—		1,051

	$	22,479	$	8,968	$	31,447

Operating Segment:
RNG	$	21,428	$	6,695	$	28,123
REG		1,051		2,273		3,324

	$	22,479	$	8,968	$	31,447


	Three Months Ended March 31, 2020
	Goods transferred at a point in time		Goods transferred over time		Total
Major Goods/Service Line:
Natural Gas Commodity	$	1,476	$	5,245	$	6,721
Natural Gas Environmental Attributes		7,024		—		7,024
Electric Commodity		—		2,753		2,753
Electric Environmental Attributes		1,743		—		1,743

	$	10,243	$	7,998	$	18,241

Operating Segment:
RNG	$	8,500	$	5,245	$	13,745
REG		1,743		2,753		4,496

	$	10,243	$	7,998	$	18,241

- Definition

The entire disclosure of revenue from contract with customer to transfer good or service and to transfer nonfinancial asset. Includes, but is not limited to, disaggregation of revenue, credit loss recognized from contract with customer, judgment and change in judgment related to contract with customer, and asset recognized from cost incurred to obtain or fulfill contract with customer. Excludes insurance and lease contracts.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-URI http://asc.fasb.org/topic&trid=49130388

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 10
-URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130551-203045

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 13
-Subparagraph (b)(2)
-URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130556-203045

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 12
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130554-203045

Reference 5: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 9
-URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130550-203045

Reference 6: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
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-Section 50
-Paragraph 12
-Subparagraph (e)
-URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130554-203045

Reference 7: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 12
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130554-203045

Reference 8: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 12
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130554-203045

Reference 9: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 15
-URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130558-203045

Reference 10: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 12
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130554-203045

+ Details

Accounts and Other Receivables

3 Months Ended

Mar. 31, 2021

Receivables, Net, Current [Abstract]

Accounts and Other Receivables

NOTE 5 – ACCOUNTS AND OTHER RECEIVABLES

The Company extends credit based upon an evaluation of the customer’s financial condition and, while collateral is not required, the Company periodically receives surety bonds that guarantee payment. Credit terms are consistent with industry standards and practices. Reserves for uncollectible accounts, if any, are recorded as part of general and administrative expenses in the Consolidated Statements of Operations. For the three months ended March 31, 2021 and 2020, there were no reserves for uncollectible accounts.

Accounts and other receivables consist of the following as of March 31, 2021 and December 31, 2020:


	March 31,		December, 31
	2021		2020
Accounts receivables	$	6,691	$	5,264
Other receivables		179		164
Reimbursable expenses		35		21

Accounts and Other Receivables, Net	$	6,905	$	5,449

Property, Plant and Equipment, Net

3 Months Ended

Mar. 31, 2021

Property, Plant and Equipment [Abstract]

Property, Plant and Equipment, Net

NOTE 6 – PROPERTY, PLANT AND EQUIPMENT, NET

Property, plant and equipment consists of the following as of March 31, 2021 and December 31, 2020:


	March 31,			December, 31
	2021			2020
Buildings and improvements	$	28,070		$	28,065
Machinery and equipment		246,448			246,874
Gas mineral rights		34,551			34,551
Construction work in progress		5,565			4,485

Total		314,634			313,975
Less: Accumulated depreciation and amortization		(132,325	)		(126,929	)

Property, Plant & Equipment, Net	$	182,309		$	187,046

Depreciation expense for property plant and equipment was $4,955 and $4,484 and amortization expense for gas mineral rights was $491 and $491 for the three months ended March 31, 2021 and 2020, respectively.

Goodwill And Intangible Assets, Net

3 Months Ended

Mar. 31, 2021

Goodwill and Intangible Assets Disclosure [Abstract]

Goodwill And Intangible Assets, Net

NOTE 7 – GOODWILL AND INTANGIBLE ASSETS, NET

Intangible assets consist of the following as of March 31, 2021 and December 31, 2020:


	March 31,		December 31,
	2021		2020
Goodwill	$	60	$	60
Intangible assets with indefinite lives:
Emissions allowances	$	777	$	777
Land use rights		329		329

Total intangible assets with indefinite lives:	$	1,106	$	1,106

Intangible assets with finite lives:
Interconnection, net of accumulated amortization of $2,446 and $2,329	$	11,834	$	11,951
Customer contracts, net of accumulated amortization of $16,541 and $16,367	$	742	$	916

Total intangible assets with finite lives:	$	12,576	$	12,867

Total Goodwill and Intangible Assets	$	13,742	$	14,033

The weighted average remaining useful life of the customer contracts and interconnection is approximately 5 years and 17 years, respectively. Amortization expense was $291 and $374 for the three months ended March 31, 2021 and 2020, respectively.

Assets Retirement Obligations

3 Months Ended

Mar. 31, 2021

Asset Retirement Obligation Disclosure [Abstract]

Asset Retirement Obligations

NOTE 8 – ASSET RETIREMENT OBLIGATIONS

The following table summarizes the activity associated with asset retirement obligations of the Company as of March 31, 2021 and December 31, 2020:


	Three Months Ended March 31, 2021			Year Ended December 31, 2020
Asset retirement obligations - beginning of period	$	5,689		$	5,928
Accretion expense		119			320
New asset retirement obligations		—			350
Decommissioning		(25	)		(909	)

Asset retirement obligations - end of period	$	5,783		$	5,689

Derivative Instruments

3 Months Ended

Mar. 31, 2021

Derivative Instrument Detail [Abstract]

Derivative Instruments

NOTE 9 – DERIVATIVE INSTRUMENTS

To mitigate market risk associated with fluctuations in energy commodity prices (natural gas) and interest rates, the Company utilizes various hedges to secure energy commodity pricing and interest rates under a board-approved program. As a result of the hedging strategy employed, the Company had the following realized and unrealized gains and losses in the Condensed Consolidated Statements of Operations for the three months ended March 31, 2021 and 2020:


			Three Months Ended
Derivative Instrument	Location		March 31, 2021		March 31, 2020
Commodity Contracts:
Realized Natural Gas		Gas commodity sales	$	—	$	551
Unrealized Natural Gas		Other income		—		(388	)
Interest Rate Swaps		Interest expense		418		(1,413	)

Net gain (loss)			$	418	$	(1,250	)

Fair Value of Financial Instruments

3 Months Ended

Mar. 31, 2021

Fair Value Disclosures [Abstract]

Fair Value of Financial Instruments

NOTE 10 – FAIR VALUE OF FINANCIAL INSTRUMENTS

The Company’s assets and liabilities that are measured at fair value on a recurring basis include the following as of March 31, 2021 and December 31, 2020, set forth by level, within the fair value hierarchy:


	March 31, 2021
	Level 1		Level 2			Level 3			Total
Interest rate swap derivative liabilities	$	—	$	(1,842	)	$	—		$	(1,842	)
Asset retirement obligations		—		—			(5,783	)		(5,783	)
Pico earn-out liability		—		—			(1,920	)		(1,920	)

	$	—	$	(1,842	)	$	(7,703	)	$	(9,545	)


	December 31, 2020
	Level 1		Level 2			Level 3			Total
Interest rate swap derivative liabilities	$	—	$	(2,260	)	$	—		$	(2,260	)
Asset retirement obligations		—		—			(5,689	)		(5,689	)
Pico earn-out liability		—		—			(1,920	)		(1,920	)

	$	—	$	(2,260	)	$	(7,609	)	$	(9,869	)

A summary of changes in the fair values of the Company’s Level 3 instruments, attributable to asset retirement obligations, for the three months ended March 31, 2021 and 2020 is included in Note 8.

In addition, certain assets are measured at fair value on a

non-recurring

basis when an indicator of impairment is identified and the assets’ fair value is determined to be less than its carrying value. See Note 3 for additional information.

- Definition

The entire disclosure for the fair value of financial instruments (as defined), including financial assets and financial liabilities (collectively, as defined), and the measurements of those instruments as well as disclosures related to the fair value of non-financial assets and liabilities. Such disclosures about the financial instruments, assets, and liabilities would include: (1) the fair value of the required items together with their carrying amounts (as appropriate); (2) for items for which it is not practicable to estimate fair value, disclosure would include: (a) information pertinent to estimating fair value (including, carrying amount, effective interest rate, and maturity, and (b) the reasons why it is not practicable to estimate fair value; (3) significant concentrations of credit risk including: (a) information about the activity, region, or economic characteristics identifying a concentration, (b) the maximum amount of loss the entity is exposed to based on the gross fair value of the related item, (c) policy for requiring collateral or other security and information as to accessing such collateral or security, and (d) the nature and brief description of such collateral or security; (4) quantitative information about market risks and how such risks are managed; (5) for items measured on both a recurring and nonrecurring basis information regarding the inputs used to develop the fair value measurement; and (6) for items presented in the financial statement for which fair value measurement is elected: (a) information necessary to understand the reasons for the election, (b) discussion of the effect of fair value changes on earnings, (c) a description of [similar groups] items for which the election is made and the relation thereof to the balance sheet, the aggregate carrying value of items included in the balance sheet that are not eligible for the election; (7) all other required (as defined) and desired information.

+ References + Details

Accrued Liabilities

3 Months Ended

Mar. 31, 2021

Payables and Accruals [Abstract]

Accrued Liabilities

NOTE 11 – ACCRUED LIABILITIES

The Company’s accrued liabilities consists of the following as of March 31, 2021 and December 31, 2020:


	March 31, 2021		December 31, 2020
Accrued expenses	$	3,613	$	4,975
Payroll and related benefits		1,543		2,341
Royalty		2,705		2,620
Utility		1,063		1,147
Other		631		456

Accrued Liabilities	$	9,555	$	11,539

Debt

3 Months Ended

Mar. 31, 2021

Debt Disclosure [Abstract]

Debt

NOTE 12 – DEBT

The Company’s debt consists of the following as of March 31, 2021 and December 31, 2020:


	March 31, 2021			December 31, 2020
Term Loans	$	27,500		$	30,000
Revolving credit facility		36,697			36,697
Less: current principal maturities		(10,000	)		(10,000	)
Less: debt issuance costs (on long-term debt)		(334	)		(429	)

Long-term Debt	$	53,863		$	56,268
Current Portion of Long- term Debt		9,536			9,492

	$	63,399		$	65,760

Amended Credit Agreement

On December 12, 2018, Montauk Energy Holdings LLC (“MEH”) entered into the Second Amended and Restated Revolving Credit and Term Loan Agreement (as amended, “Credit Agreement”), by and among MEH, the financial institutions from time to time party thereto as lenders and Comerica Bank, as the administrative agent, sole lead arranger and sole bookrunner (“Comerica”). The Credit Agreement (i) amended and restated in its entirety MEH’s prior revolving credit and term loan facility, dated as of August 4, 2017, as amended, with Comerica and certain other financial institutions and (ii) replaces in its entirety the prior credit agreement, dated as of August 4, 2017, as amended, between Comerica and Bowerman Power LFG, LLC, a wholly-owned subsidiary of MEH.

On March 21, 2019, MEH entered into the first amendment to the Credit Agreement (the “First Amendment”), which clarified a variety of terms, definitions and calculations in the Credit Agreement. The Credit Agreement requires the Company to maintain customary affirmative and negative covenants, including certain financial covenants, which are measured at the end of each fiscal quarter.

On September 12, 2019, MEH entered into the second amendment to the Credit Agreement (the “Second Amendment”). Among other matters, the Second Amendment redefined the Fixed Charge Coverage Ratio (as defined in the Credit Agreement), reduced the commitments under the revolving credit facility to $80,000, redefined the Total Leverage Ratio (as defined in the Credit Agreement) and eliminated the RIN Floor (as defined in the Second Amendment) as an Event of Default. In connection with the Second Amendment, MEH paid down the outstanding term loan by $38,250 and the resulting quarterly principal installments were reduced to $2,500. The maturity date of the Credit Agreement was not changed by the Second Amendment and remains December 12, 2023.

In connection with the completion of the Reorganization Transactions and the IPO, the Company entered into the third amendment to the Credit Agreement (the “Third Amendment”). This amendment permitted the Change of Control provisions, as defined in the underlying agreement, to permit the Reorganization Transactions and IPO to be completed. The amendment also added LIBOR cessation fallback language for a transition to specified alternative SOFR-based rates, or, if those alternatives cannot be determined, to another rate selected by the administrative agent and the borrower under the Amended Credit Agreement as well as provisions that allow one or more parties to transition in advance of the dates set forth above where specified conditions are met.

The Credit Agreement, which is secured by a lien on substantially all assets of the Company and certain of its subsidiaries, provides for a $95,000 term loan and a $90,000 revolving credit facility. The term loan amortizes in quarterly installments of $2,500 and has a final maturity of December 12, 2023 with an interest rate of 2.926% and 2.961% at March 31, 2021 and December 31, 2020, respectively.

As of March 31, 2021, $27,500 was outstanding under the term loan and $36,697 was outstanding under the revolving credit facility. In addition, the Company had $5,765 of outstanding letters of credit as of March 31, 2021. Amounts available under the revolving credit facility are reduced by any amounts outstanding under letters of credit. As of March 31, 2021, the Company’s capacity available for borrowing under the revolving credit facility was $37,537. Borrowings of the term loans and revolving credit facility bear interest at the LIBOR rate plus an applicable margin or the Prime Reference Rate plus an applicable margin, as elected by the Company.

The Company accounted for the Third Amendment as a debt modification in accordance with ASC 470,

Debt

. In connection with the Credit Agreement, the Company paid a total of $1,821 in new debt issuance costs comprised of $836 in costs paid to the lenders and $985 in costs paid as arranger fees. Of this amount, $364 was expensed and $1,457 was capitalized and will be amortized over the life of the Credit Agreement. The Company also incurred $59 in legal fees associated with the Credit Agreement. Amortized debt issuance expense in the amount of $137 and $187 for the three months ended March 31, 2021 and 2020, respectively, was recorded in the interest expense on the statement of operations.

As of March 31, 2021, the Company was in compliance with all applicable financial covenants under the Credit Agreement.

Capitalized Interest

Capitalized interest was $0 and $361 for the three months ended March 31, 2021 and March 31, 2020, respectively. Interest is capitalized using the borrowing rate for the assets being constructed. Interest capitalized during 2020 was for the construction of two

LFG-to-energy

projects.

Income Taxes

3 Months Ended

Mar. 31, 2021

Income Tax Disclosure [Abstract]

Income Taxes

NOTE 13 – INCOME TAXES

The Company’s provision for income taxes in interim periods is typically computed by applying the estimated annual effective tax rates to income or loss before income taxes for the period. In addition,

non-recurring

or discrete items are recorded during the period(s) in which they occur. In the first quarter of 2021, the Company calculated an unusually high estimated annual effective tax rate such that a reliable estimate of the annual effective tax rate could not be made. As such, the Company utilized the actual effective tax rate for the year to date ended March 31, 2021 as the Company’s best estimate for the first quarter of 2021.


	Three Months Ended
	March 31, 2021			March 31, 2020
Provision for income taxes	$	1,382		$	(10,787	)
Effective tax rate		(10.7	)%		217.0	%

Income tax expense for the three months ended March 31, 2021 was calculated using the actual year to date effective tax rate. The effective tax rate differs from the U.S. federal statutory rate of 21% primarily due to the current year permanent disallowance of officers’ compensation.

The effective tax rate of (10.7)% for the three months ended March 31, 2021 was lower than the rate for the three months ended March 31, 2020 primarily due to the income tax benefit that increased the 2020 effective tax rate in connection with the January 1, 2020 dissolution of the MEC partnership which allows all entities under Montauk Energy Capital (“MEC”) to file as part of our consolidated federal tax group.

- Definition

The entire disclosure for income taxes. Disclosures may include net deferred tax liability or asset recognized in an enterprise's statement of financial position, net change during the year in the total valuation allowance, approximate tax effect of each type of temporary difference and carryforward that gives rise to a significant portion of deferred tax liabilities and deferred tax assets, utilization of a tax carryback, and tax uncertainties information.

+ References + Details

Share-Based Compensation

3 Months Ended

Mar. 31, 2021

Share-based Payment Arrangement [Abstract]

Share-Based Compensation

NOTE 14 – SHARE-BASED COMPENSATION

In January 2021, Montauk Renewables undertook the Reorganization Transactions which resulted in the Company owning all of the assets and entities (excluding Montauk USA) through which MNK’s business and operations are conducted. As a result of the Distribution, the options outstanding under MNK’s Employee Share Appreciation Rights Scheme (the “SAR Plan”) were cancelled. The Company recorded $82 and $230 of SAR Plan compensation expense incurred in January 2021, prior to the cancellation, and the three months ended March 31, 2020, respectively, and $2,050 of accelerated compensation expense in its condensed consolidated statements of operations within general and administrative expenses in connection with the cancellation of the options under the SAR Plan for the three months ended March 31, 2021.

The board of directors of Montauk Renewables adopted in January 2021 the Montauk Renewables, Inc. Equity and Incentive Compensation Plan (“MRI EICP”). Following the closing of the IPO, the board of directors of Montauk Renewables approved in January 2021 the grant of

non-qualified

stock options, and restricted stock unit and restricted stock awards to the employees of Montauk Renewables and its subsidiaries. In connection with the grants of the restricted stock, the officers of the Company made elections under Section 83(b) of the Internal Revenue Code of 1986, as amended (the “Code”). In connection with such elections, the Company withheld 950,214 shares of common stock from such awards at a price of $11.38 per share from such awards. The Company records and reports share-based compensation for stock options, restricted stock, and restricted stock units when vested, in the case of restricted stock and restricted stock units, and exercised, in the case of options, such awards are settled in shares of common stock of Montauk Renewables. As of March 31, 2021, unrecognized MRI EICP compensation expense for awards the Company expects to vest approximated $14,900 and will be recognized over approximately 5 years. The Company recognized $1,654 of MRI EICP compensation expense in its condensed consolidated statements of operations within general and administrative expenses for the three months ended March 31, 2021.

The restricted stock, restricted stock unit and option awards are subject to vesting schedules that commence or conclude, in the case of the option and restricted stock unit awards, on the

one-year

anniversary of the grant date and are subject to the terms and conditions of the MRI EICP and related award agreements including, in the case of the restricted stock awards, each officer having made an election under Section 83(b) of the Code. The Company recorded $10,813 of compensation expense in its condensed consolidated statements of operations within general and administrative expenses for the three months ended March 31, 2021 in connection with the withheld 950,214 shares associated with the Section 83(b) elections.

Options granted under the MRI EICP allow the recipient to receive the Company’s common stock equal to the appreciation in the fair market value of the Company’s common stock between the date the award was granted and the exercise and settlement of options into shares as of the exercise date. The fair value of the MRI EICP options were estimated using the Black-Scholes option pricing model with the following weighted-average assumptions (no dividends were expected):


	March 31, 2021
Risk-free interest rate		0.5	%
Expected volatility		32.0	%
Expected option life (in years)		5.5
Grant-date fair value	$	3.44

The risk-free interest rate was based on United States Treasury yields in effect at the time of the grant for notes with terms comparable to the awards. The expected option life represents an estimate of the period of time options are expected to remain outstanding based on the

mid-point

of the exercisable period to account for the possibility of early exercise or maturity. As the Company recently completed its IPO in January 2021, there is no sufficient stock volatility historical data. The expected volatility was based on the average historical stock price volatility of comparable publicly-traded companies in its industry peer group.

The following table summarizes the options, restricted stock and restricted stock units outstanding under the MRI EICP as of March 31, 2021:


	Restricted Shares					Restricted Stock Units					Options
	Number of Shares			Weighted Average Grant Date Fair Value		Number of Shares			Weighted Average Grant Date Fair Value		Number of Shares		Weighted Average Exercise Price
End of period - December 31, 2020		—		$	—		—		$	—		—	$	—

Beginning of period - January 1, 2021		—		$	—		—		$	—		—	$	—
Granted		2,092,836			11.38		29,568			11.38		950,214		11.38
Vested		(950,214	)		11.38		—			—		—		—
Forfeited		—			—		(792	)		11.38		—		—
Exercised		—			—		—			—		—		—

End of period – March 31, 2021		1,142,622		$	11.38		28,776		$	11.38		950,214	$	11.38

The following table summarizes the options and restricted stock under the SAR Plan as of March 31, 2020:


	Options					Restricted Stock
	Number of Shares			Weighted Average Exercise Price		Number of Shares		Weighted Average Grant Date Fair Value
End of period - December 31, 2019		1,872,534		$	1.18		1,939,200	$	0.95

Beginning of period - January 1, 2020		1,872,534		$	1.18		1,939,200	$	0.95
Granted		—			—		—		—
Forfeited		—			—		—		—
Exercised		(50,000	)		0.44		—		—

End of period – March 31, 2020		1,822,534		$	1.20		1,939,200	$	0.95

Defined Contribution Plan	3 Months Ended
Defined Contribution Plan	Mar. 31, 2021
Retirement Benefits [Abstract]
Defined Contribution Plan	NOTE 15 – DEFINED CONTRIBUTION PLAN The Company maintains a 401(k) defined contribution plan for eligible employees. The Company matches 50% of an employee’s deferrals up to 4%. The Company also contributes 3% of eligible employee’s compensation expense as a safe harbor contribution. The matching contributions vest ratably over four years of service, while the safe harbor contributions vest immediately. Incurred expense related to the 401(k) plan was approximately $135 and $108 for the three months ended March 31, 2021 and 2020, respectively.

Segment Information

3 Months Ended

Mar. 31, 2021

Segment Reporting [Abstract]

Segment Information

NOTE 16 – SEGMENT INFORMATION

The Company’s reportable segments for the three months ended March 31, 2021 and 2020 are Renewable Natural Gas and Renewable Electricity Generation. Renewable Natural Gas includes the production of RNG. Renewable Electricity Generation includes generation of electricity at

biogas-to-electricity

plants. The corporate entity is not determined to be an operating segment but is discretely disclosed for purposes of reconciliation of the Company’s condensed consolidated financial statements. The following tables are consistent with the manner in which the chief operating decision maker evaluates the performance of each segment and allocates the Company’s resources. In the following tables “RNG” refers to Renewable Natural Gas and “REG” refer to Renewable Electricity Generation.


	Three Months Ended March 31, 2021
	RNG		REG			Corporate			Total
Total Revenue	$	28,123	$	3,324		$	—		$	31,447
Net Income (Loss)		10,561		(2,241	)		(22,585	)		(14,265	)
EBITDA		14,779		(765	)		(20,514	)		(6,500	)
Adjusted EBITDA (1)		14,779		(139	)		(20,426	)		(5,786	)
Total Assets		157,436		50,156			45,770			253,362
Capital Expenditure		1,306		23			6			1,335

(1) First quarter of 2021 EBITDA Reconciliation

The following table is a reconciliation of the Company’s reportable segments’ net income from continuing operations to Adjusted EBITDA for the three months ended March 31, 2021:


	Three Months Ended March 31, 2021
	RNG		REG			Corporate			Total
Net Income (loss)	$	10,561	$	(2,241	)	$	(22,585	)	$	(14,265	)
Depreciation and amortization		4,218		1,474			45			5,737
Interest expense		—		—			646			646
Income tax expense (benefit)		—		2			1,380			1,382

EBITDA	$	14,779	$	(765	)	$	(20,514	)	$	(6,500	)

Impairment loss		—		626			—			626
Transaction costs		—		—			88			88

Adjusted EBITDA	$	14,779	$	(139	)	$	(20,426	)	$	(5,786	)


	Three Months Ended March 31, 2020
	RNG		REG			Corporate			Total
Total Revenue	$	13,425	$	4,496		$	482		$	18,403
Net Income (Loss)		1,158		(519	)		5,177			5,816
EBITDA		4,628		1,318			(3,355	)		2,591
Adjusted EBITDA (1)		4,628		1,596			(2,967	)		3,257
Total Assets		137,268		81,809			36,713			255,790
Capital Expenditure		4,105		1,060			39			5,204

(1) First quarter of 2020 EBITDA Reconciliation

The following table is a reconciliation of the Company’s reportable segments’ net income from continuing operations to Adjusted EBITDA for the three months ended March 31, 2020:


	Three Months Ended March 31, 2020
	RNG		REG			Corporate			Total
Net Income (loss)	$	1,158	$	(519	)	$	5,177		$	5,816
Depreciation and amortization		3,470		1,835			43			5,348
Interest expense		—		—			2,214			2,214
Income tax expense (benefit)		—		2			(10,789	)		(10,787	)

EBITDA	$	4,628	$	1,318		$	(3,355	)	$	2,591
Impairment loss		—		278			—			278
Non-cash hedging charges		—		—			388			388

Adjusted EBITDA	$	4,628	$	1,596		$	(2,967	)	$	3,257

For the three months ended March 31, 2021 and 2020, four and three customers, respectively, made up greater than 10% of our total revenues.


	Three Months Ended March 31, 2021
	RNG			REG			Corporate		Total
Customer A		13.1	%		—			—		13.1	%
Customer B		10.0	%		—			—		10.0	%
Customer C		11.0	%		—			—		11.0	%
Customer D		26.2	%		—			—		26.2	%

	Three Months Ended March 31, 2020
	RNG			REG			Corporate		Total
Customer A		—			20.6	%		—		20.6	%
Customer B		18.6	%		—			—		18.6	%
Customer C		15.7	%		—			—		15.7	%

- Definition

The entire disclosure for reporting segments including data and tables. Reportable segments include those that meet any of the following quantitative thresholds a) it's reported revenue, including sales to external customers and intersegment sales or transfers is 10 percent or more of the combined revenue, internal and external, of all operating segments b) the absolute amount of its reported profit or loss is 10 percent or more of the greater, in absolute amount of 1) the combined reported profit of all operating segments that did not report a loss or 2) the combined reported loss of all operating segments that did report a loss c) its assets are 10 percent or more of the combined assets of all operating segments.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 31
-URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8924-108599

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 34
-URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8981-108599

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 21
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8721-108599

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
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Reference 5: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
-Section 50
-Paragraph 32
-Subparagraph (f)
-URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8933-108599

Reference 6: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
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-Paragraph 32
-Subparagraph (e)
-URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8933-108599

Reference 7: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
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-Paragraph 26
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Reference 8: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
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Reference 9: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
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-Name Accounting Standards Codification
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Reference 11: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
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-URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e9054-108599

Reference 12: http://www.xbrl.org/2003/role/disclosureRef
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-Name Accounting Standards Codification
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-URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8657-108599

Reference 13: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
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-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8721-108599

Reference 14: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-URI http://asc.fasb.org/topic&trid=2134510

+ Details

Leases

3 Months Ended

Mar. 31, 2021

Leases [Abstract]

Leases

NOTE 17 – LEASES

The Company leases office space and other office equipment under operating lease arrangements (with initial terms greater than twelve months), expiring in various years through 2024. These leases have been entered into to better enable the Company to conduct business operations. Office space is leased to provide adequate workspace for all employees in Pittsburgh, Pennsylvania and Houston, Texas.

The Company determines if an arrangement is, or contains, a lease at inception based on whether that contract conveys the right to control the use of an identified asset in exchange for consideration for a period of time. For all operating lease arrangements, the Company presents at the commencement date: a lease liability, which is a lessee’s obligation to make lease payments arising from a lease, measured on a discounted basis; and a

right-of-use

asset, which is an asset that represents the lessee’s right to use, or control the use of, a specified asset for the lease term.

The Company has elected, as a practical expedient, not to separate

non-lease

components from lease components, and instead account for each separate component as a single lease component for all lease arrangements, as lessee. In addition, the Company has elected, as a practical expedient, not to apply lease recognition requirements to short-term lease arrangements, generally those with a lease term of less than twelve months, for all classes of underlying assets. In determination of the lease term, the Company considers the likelihood of lease renewal options and lease termination provisions.

The Company uses its incremental borrowing rate as the basis to calculate the present value of future lease payments at lease commencement. The incremental borrowing rate approximates the rate to borrow funds on a collateralized basis over a similar term and in a similar economic environment.

As of March 31, 2021, there were no leases entered into which have not yet commenced and that would entitle the Company to significant rights or create additional obligations.

Supplemental information related to operating lease arrangements was as follows:


	Three Months Ended March 31,
	2021			2020
Cash paid for amounts included in the measurement of operating lease liabilities	$	76		$	75
Weighted average remaining lease term (in years)		1.51			1.61
Weighted average discount rate		5.00	%		5.00	%

Future minimum lease payments for the three months ending March 31, are as follows:


	Amount
Year Ending
Remainder of 2021	$	227
2022		317
2023		8
2024		1
Interest		(20	)

Total	$	533

Loss Per Share

3 Months Ended

Mar. 31, 2021

Earnings Per Share [Abstract]

Loss Per Share

NOTE 18 – LOSS PER SHARE

Basic loss per share were computed using the following common share data for the three months ended March 31:


	Three Months Ended March 31, 2021
Net loss	$	(14,265	)
Basic weighted-average shares outstanding		141,015,213
Dilutive effect of share-based awards		—

Diluted weighted-average shares outstanding		141,015,213

Basic loss per share	$	(0.10	)
Diluted loss per share	$	(0.10	)

As a result of incurring a net loss for the three months ended March 31, 2021, potential common shares of 2,121,612 were excluded from diluted loss per share because the effect would have been antidilutive.

Related Party Transactions	3 Months Ended
Related Party Transactions	Mar. 31, 2021
Related Party Transactions [Abstract]
Related Party Transactions	NOTE 19 – RELATED PARTY TRANSACTIONS In connection with the Distribution, the Company loaned MNK $7,140, which is recorded in the condensed consolidated balance sheet within related party receivable, for its dividends tax liability arising under the South African Income Tax Act, 1962, as amended. As security for this loan, MNK has pledged certain of its shares in the Company to Montauk and agreed to use the proceeds from the sale of such shares to repay this loan.

Subsequent Events	3 Months Ended
Subsequent Events	Mar. 31, 2021
Subsequent Events [Abstract]
Subsequent Events	NOTE 20 – SUBSEQUENT EVENTS The Company evaluated its March 31, 2021 condensed consolidated financial statements through May 14, 2021, the date the financial statements were issued. The Company is not aware of any subsequent events which would require disclosure in the consolidated financial statements, except for the matters discussed below. On May 10, 2021, the Company, through a newly formed wholly-owned subsidiary, Montauk Swine Ag, LLC (“Montauk Swine”), announced the acquisition of the technology and certain assets of a business (the “Acquisition”) that specializes in developing technology to recover, refine, and recycle natural resources from waste streams of modern agriculture through proprietary and other processes in order to produce high quality renewable natural gas, bio-oil and biochar (the “Business”). The assets acquired include real-property, intellectual property, mobile equipment, and other equipment related to operating the Business. The purchase price for the Business and related assets consisted of approximately (i) $3,797 paid in cash at closing and (ii) two restricted stock awards, in equal amounts, granted under the MRI EICP.

Summary of Significant Accounting Policies (Policies)	3 Months Ended
Summary of Significant Accounting Policies (Policies)	Mar. 31, 2021
Accounting Policies [Abstract]
Basis of Presentation	Basis of Presentation The accompanying unaudited condensed consolidated financial statements have been prepared in accordance with accounting principles generally accepted in the United States (“GAAP”) for interim financial information and with the instructions of the SEC on Form 10-Q and Rule 10-01 of Regulation S-X. Accordingly, they do not include all of the information and disclosures required by GAAP for complete financial statements. In the opinion of management, the condensed consolidated financial statements include all adjustments necessary, which are of a normal and recurring nature, for the fair presentation of the Company’s financial position and of the results of operations and cash flows for the periods presented. These financial statements should be read in conjunction with the audited consolidated financial statements and notes thereto for the year ended December 31, 2020 included in the Company’s Annual Report on Form 10-K filed with the SEC on March 31, 2021 (the “2020 Annual Report”). The results of operations for the three months ended March 31, 2021 in this report are not necessarily indicative of the results that may be expected for any other interim period or for the full year. The balance sheet at December 31, 2020, has been derived from the audited financial statements as of that date. For further information, refer to our audited financial statements and notes thereto included for the year ended December 31, 2020 in the 2020 Annual Report. The historical consolidated financial information included reflects the historical results of operations and financial position of Montauk USA. The consolidated financial statements of Montauk USA, became our historical financial statements following the IPO. Certain historical financial information included relates to periods prior to the Reorganization Transactions.
Retrospective Presentation of Ownership Exchange	Retrospective Presentation of Ownership Exchange As discussed in Note 1, as a result of the Reorganization Transactions, the Company acquired the assets and entities (excluding Montauk USA) which were previously owned by MNK. As part of the Reorganization Transactions, a 1:1 pro rata exchange of shares of the Company’s common stock was made to holders of MNK’s ordinary shares. The Reorganization Transactions resulted in a pro rata exchange whereby the ownership of the Company after the Reorganization Transactions was identical to the ownership of MNK prior to the Reorganization Transaction and was therefore akin to a common control transaction. All members’ equity in the financial statements and notes have been retrospectively adjusted to give effect to the 1:1 ratio, as if such pro rata exchange occurred as of all pre-IPO periods presented, including periods presented on the Condensed Consolidated Balance Sheets, Condensed Consolidated Statements of Operations, Consolidated Statements of Stockholders’ and Members’ Equity and notes to the Condensed Consolidated Financial Statements contained herein.
Use of Estimates	Use of Estimates The preparation of financial statements, in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. Actual results could differ from those estimates.
Equity-Based Compensation	Equity-Based Compensation The Company accounts for equity-based compensation under the provisions of ASC 718, Compensation – Stock Compensation , (“ ASC 718 ”). ASC 718 requires compensation costs related to share-based payment transactions, measured based on the fair value of the instruments issued, be recognized in the consolidated financial statements over the requisite service period of the award. Stock options are initially measured on the grant date using the Black-Scholes valuation model, which requires the use of subjective assumptions related to the expected stock price volatility, term, risk-free interest rate and dividend yield. For restricted stock and restricted stock units, the Company determines the grant date fair value based on the closing market price of the stock on the date of the grant.
Recently Issued Accounting Standards	Recently Issued Accounting Standards In June 2016, the FASB issued ASU No. 2016-13, Financial Instruments – Credit Losses . The new guidance changes how entities measure credit losses on financial instruments and the timing of when such losses are recorded. The new standard is effective for fiscal years beginning after December 15, 2022, with early adoption is permitted. The Company is currently evaluating the impact this ASU will have on its consolidated financial statements and related disclosures. In August 2020, the FASB issued ASU 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) , which simplifies the accounting for convertible instruments and contracts in an entity’s own equity. This guidance is effective for annual reporting periods beginning after December 15, 2021, including interim periods within those years, with early adoption permitted only as of annual reporting periods beginning after December 15, 2020. The Company is currently assessing the impact this standard will have on its consolidated financial statements or related financial statement disclosures. In March 2020, the FASB issued ASU No. 2020-04, Reference Rate Reform (Topic 848) , which provides optional expedients and exceptions to the current guidance on contract modifications and hedging relationships to ease the financial reporting burdens of the expected market transition from London Interbank Offered Rate (“LIBOR”) and other interbank offered rates to alternative reference rates. The guidance was effective upon issuance and may be applied prospectively to contract modifications made and hedging relationships entered into or evaluated on or before December 31, 2022. The Company does not currently anticipate this impact to have a material effect on our agreements, but is working with the administrative agent during the LIBOR transition.

Revenues from Contracts with Customers (Tables)

3 Months Ended

Mar. 31, 2021

Revenue from Contract with Customer [Abstract]

Summary of Company's Revenue by Major Source


	Three Months Ended March 31, 2021
	Goods transferred at a point in time		Goods transferred over time		Total
Major Goods/Service Line:
Natural Gas Commodity	$	3,976	$	6,695	$	10,671
Natural Gas Environmental Attributes		17,452		—		17,452
Electric Commodity		—		2,273		2,273
Electric Environmental Attributes		1,051		—		1,051

	$	22,479	$	8,968	$	31,447

Operating Segment:
RNG	$	21,428	$	6,695	$	28,123
REG		1,051		2,273		3,324

	$	22,479	$	8,968	$	31,447


	Three Months Ended March 31, 2020
	Goods transferred at a point in time		Goods transferred over time		Total
Major Goods/Service Line:
Natural Gas Commodity	$	1,476	$	5,245	$	6,721
Natural Gas Environmental Attributes		7,024		—		7,024
Electric Commodity		—		2,753		2,753
Electric Environmental Attributes		1,743		—		1,743

	$	10,243	$	7,998	$	18,241

Operating Segment:
RNG	$	8,500	$	5,245	$	13,745
REG		1,743		2,753		4,496

	$	10,243	$	7,998	$	18,241

Accounts and Other Receivables (Tables)

3 Months Ended

Mar. 31, 2021

Receivables, Net, Current [Abstract]

Schedule of Accounts and Other Receivables

Accounts and other receivables consist of the following as of March 31, 2021 and December 31, 2020:


	March 31,		December, 31
	2021		2020
Accounts receivables	$	6,691	$	5,264
Other receivables		179		164
Reimbursable expenses		35		21

Accounts and Other Receivables, Net	$	6,905	$	5,449

Property, Plant and Equipment, Net (Tables)

3 Months Ended

Mar. 31, 2021

Property, Plant and Equipment [Abstract]

Summary of Property Plant and Equipment

Property, plant and equipment consists of the following as of March 31, 2021 and December 31, 2020:


	March 31,			December, 31
	2021			2020
Buildings and improvements	$	28,070		$	28,065
Machinery and equipment		246,448			246,874
Gas mineral rights		34,551			34,551
Construction work in progress		5,565			4,485

Total		314,634			313,975
Less: Accumulated depreciation and amortization		(132,325	)		(126,929	)

Property, Plant & Equipment, Net	$	182,309		$	187,046

Goodwill And Intangible Assets, Net (Tables)

3 Months Ended

Mar. 31, 2021

Goodwill and Intangible Assets Disclosure [Abstract]

schedule of Intangible Assets

Intangible assets consist of the following as of March 31, 2021 and December 31, 2020:


	March 31,		December 31,
	2021		2020
Goodwill	$	60	$	60
Intangible assets with indefinite lives:
Emissions allowances	$	777	$	777
Land use rights		329		329

Total intangible assets with indefinite lives:	$	1,106	$	1,106

Intangible assets with finite lives:
Interconnection, net of accumulated amortization of $2,446 and $2,329	$	11,834	$	11,951
Customer contracts, net of accumulated amortization of $16,541 and $16,367	$	742	$	916

Total intangible assets with finite lives:	$	12,576	$	12,867

Total Goodwill and Intangible Assets	$	13,742	$	14,033

Asset Retirement Obligations (Tables)

3 Months Ended

Mar. 31, 2021

Asset Retirement Obligation Disclosure [Abstract]

Summary of Activity Associated with Asset Retirement Obligations

The following table summarizes the activity associated with asset retirement obligations of the Company as of March 31, 2021 and December 31, 2020:


	Three Months Ended March 31, 2021			Year Ended December 31, 2020
Asset retirement obligations - beginning of period	$	5,689		$	5,928
Accretion expense		119			320
New asset retirement obligations		—			350
Decommissioning		(25	)		(909	)

Asset retirement obligations - end of period	$	5,783		$	5,689

Derivative Instruments (Tables)

3 Months Ended

Mar. 31, 2021

Derivative Instrument Detail [Abstract]

Summary of Realized and Unrealized Gains and Losses of Derivative Instrument

As a result of the hedging strategy employed, the Company had the following realized and unrealized gains and losses in the Condensed Consolidated Statements of Operations for the three months ended March 31, 2021 and 2020:


			Three Months Ended
Derivative Instrument	Location		March 31, 2021		March 31, 2020
Commodity Contracts:
Realized Natural Gas		Gas commodity sales	$	—	$	551
Unrealized Natural Gas		Other income		—		(388	)
Interest Rate Swaps		Interest expense		418		(1,413	)

Net gain (loss)			$	418	$	(1,250	)

- Definition

Tabular disclosure of pertinent information about a derivative or group of derivatives on a disaggregated basis, such as for individual instruments, or small groups of similar instruments. May include a combination of the type of instrument, risks being hedged, notional amount, hedge designation, related hedged item, inception date, maturity date, or other relevant item.

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+ Details

Fair Value of Financial Instruments (Tables)

3 Months Ended

Mar. 31, 2021

Fair Value Disclosures [Abstract]

Summary of Assets and Liabilities that are Measured at Fair Value on a Recurring Basis


	March 31, 2021
	Level 1		Level 2			Level 3			Total
Interest rate swap derivative liabilities	$	—	$	(1,842	)	$	—		$	(1,842	)
Asset retirement obligations		—		—			(5,783	)		(5,783	)
Pico earn-out liability		—		—			(1,920	)		(1,920	)

	$	—	$	(1,842	)	$	(7,703	)	$	(9,545	)


	December 31, 2020
	Level 1		Level 2			Level 3			Total
Interest rate swap derivative liabilities	$	—	$	(2,260	)	$	—		$	(2,260	)
Asset retirement obligations		—		—			(5,689	)		(5,689	)
Pico earn-out liability		—		—			(1,920	)		(1,920	)

	$	—	$	(2,260	)	$	(7,609	)	$	(9,869	)

Accrued Liabilities (Tables)

3 Months Ended

Mar. 31, 2021

Payables and Accruals [Abstract]

Summary of Accrued Liabilities

The Company’s accrued liabilities consists of the following as of March 31, 2021 and December 31, 2020:


	March 31, 2021		December 31, 2020
Accrued expenses	$	3,613	$	4,975
Payroll and related benefits		1,543		2,341
Royalty		2,705		2,620
Utility		1,063		1,147
Other		631		456

Accrued Liabilities	$	9,555	$	11,539

Debt (Table)

3 Months Ended

Mar. 31, 2021

Debt Disclosure [Abstract]

Summary of Company Debt

The Company’s debt consists of the following as of March 31, 2021 and December 31, 2020:


	March 31, 2021			December 31, 2020
Term Loans	$	27,500		$	30,000
Revolving credit facility		36,697			36,697
Less: current principal maturities		(10,000	)		(10,000	)
Less: debt issuance costs (on long-term debt)		(334	)		(429	)

Long-term Debt	$	53,863		$	56,268
Current Portion of Long- term Debt		9,536			9,492

	$	63,399		$	65,760

- Definition

Tabular disclosure of long-debt instruments or arrangements, including identification, terms, features, collateral requirements and other information necessary to a fair presentation. These are debt arrangements that originally required repayment more than twelve months after issuance or greater than the normal operating cycle of the entity, if longer.

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+ Details

Income Taxes (Tables)

3 Months Ended

Mar. 31, 2021

Income Tax Disclosure [Abstract]

Schedule of Effective Income Tax Rate Reconciliation

non-recurring


	Three Months Ended
	March 31, 2021			March 31, 2020
Provision for income taxes	$	1,382		$	(10,787	)
Effective tax rate		(10.7	)%		217.0	%

Share-Based Compensation (Tables)

3 Months Ended

Mar. 31, 2021

Share-based Payment Arrangement [Abstract]

Summary of Fair Value of MRI EICP Options and Valuation Assumptions

The fair value of the MRI EICP options were estimated using the Black-Scholes option pricing model with the following weighted-average assumptions (no dividends were expected):


	March 31, 2021
Risk-free interest rate		0.5	%
Expected volatility		32.0	%
Expected option life (in years)		5.5
Grant-date fair value	$	3.44

Summary of Outstanding Activity of Options,Restricted Stock and Restricted Stock Units under MRI EICP

The following table summarizes the options, restricted stock and restricted stock units outstanding under the MRI EICP as of March 31, 2021:


	Restricted Shares					Restricted Stock Units					Options
	Number of Shares			Weighted Average Grant Date Fair Value		Number of Shares			Weighted Average Grant Date Fair Value		Number of Shares		Weighted Average Exercise Price
End of period - December 31, 2020		—		$	—		—		$	—		—	$	—

Beginning of period - January 1, 2021		—		$	—		—		$	—		—	$	—
Granted		2,092,836			11.38		29,568			11.38		950,214		11.38
Vested		(950,214	)		11.38		—			—		—		—
Forfeited		—			—		(792	)		11.38		—		—
Exercised		—			—		—			—		—		—

End of period – March 31, 2021		1,142,622		$	11.38		28,776		$	11.38		950,214	$	11.38

Summary of Outstanding Activity of Options and Restricted Stock under SAR Plan

The following table summarizes the options and restricted stock under the SAR Plan as of March 31, 2020:


	Options					Restricted Stock
	Number of Shares			Weighted Average Exercise Price		Number of Shares		Weighted Average Grant Date Fair Value
End of period - December 31, 2019		1,872,534		$	1.18		1,939,200	$	0.95

Beginning of period - January 1, 2020		1,872,534		$	1.18		1,939,200	$	0.95
Granted		—			—		—		—
Forfeited		—			—		—		—
Exercised		(50,000	)		0.44		—		—

End of period – March 31, 2020		1,822,534		$	1.20		1,939,200	$	0.95

Segment Information (Tables)

3 Months Ended

Mar. 31, 2021

Segment Reporting [Abstract]

Summary of Reconciliation of the Company's Reportable Segments' Net Income from Continuing Operations

In the following tables “RNG” refers to Renewable Natural Gas and “REG” refer to Renewable Electricity Generation.


	Three Months Ended March 31, 2021
	RNG		REG			Corporate			Total
Total Revenue	$	28,123	$	3,324		$	—		$	31,447
Net Income (Loss)		10,561		(2,241	)		(22,585	)		(14,265	)
EBITDA		14,779		(765	)		(20,514	)		(6,500	)
Adjusted EBITDA (1)		14,779		(139	)		(20,426	)		(5,786	)
Total Assets		157,436		50,156			45,770			253,362
Capital Expenditure		1,306		23			6			1,335

(1) First quarter of 2021 EBITDA Reconciliation

The following table is a reconciliation of the Company’s reportable segments’ net income from continuing operations to Adjusted EBITDA for the three months ended March 31, 2021:


	Three Months Ended March 31, 2021
	RNG		REG			Corporate			Total
Net Income (loss)	$	10,561	$	(2,241	)	$	(22,585	)	$	(14,265	)
Depreciation and amortization		4,218		1,474			45			5,737
Interest expense		—		—			646			646
Income tax expense (benefit)		—		2			1,380			1,382

EBITDA	$	14,779	$	(765	)	$	(20,514	)	$	(6,500	)

Impairment loss		—		626			—			626
Transaction costs		—		—			88			88

Adjusted EBITDA	$	14,779	$	(139	)	$	(20,426	)	$	(5,786	)


	Three Months Ended March 31, 2020
	RNG		REG			Corporate			Total
Total Revenue	$	13,425	$	4,496		$	482		$	18,403
Net Income (Loss)		1,158		(519	)		5,177			5,816
EBITDA		4,628		1,318			(3,355	)		2,591
Adjusted EBITDA (1)		4,628		1,596			(2,967	)		3,257
Total Assets		137,268		81,809			36,713			255,790
Capital Expenditure		4,105		1,060			39			5,204

(1) First quarter of 2020 EBITDA Reconciliation

The following table is a reconciliation of the Company’s reportable segments’ net income from continuing operations to Adjusted EBITDA for the three months ended March 31, 2020:


	Three Months Ended March 31, 2020
	RNG		REG			Corporate			Total
Net Income (loss)	$	1,158	$	(519	)	$	5,177		$	5,816
Depreciation and amortization		3,470		1,835			43			5,348
Interest expense		—		—			2,214			2,214
Income tax expense (benefit)		—		2			(10,789	)		(10,787	)

EBITDA	$	4,628	$	1,318		$	(3,355	)	$	2,591
Impairment loss		—		278			—			278
Non-cash hedging charges		—		—			388			388

Adjusted EBITDA	$	4,628	$	1,596		$	(2,967	)	$	3,257

Summary of Revenue by Major Customers

For the three months ended March 31, 2021 and 2020, four and three customers, respectively, made up greater than 10% of our total revenues.


	Three Months Ended March 31, 2021
	RNG			REG			Corporate		Total
Customer A		13.1	%		—			—		13.1	%
Customer B		10.0	%		—			—		10.0	%
Customer C		11.0	%		—			—		11.0	%
Customer D		26.2	%		—			—		26.2	%

	Three Months Ended March 31, 2020
	RNG			REG			Corporate		Total
Customer A		—			20.6	%		—		20.6	%
Customer B		18.6	%		—			—		18.6	%
Customer C		15.7	%		—			—		15.7	%

Leases (Tables)

3 Months Ended

Mar. 31, 2021

Leases [Abstract]

Summary of Supplemental Information Related To Operating Leases

Supplemental information related to operating lease arrangements was as follows:


	Three Months Ended March 31,
	2021			2020
Cash paid for amounts included in the measurement of operating lease liabilities	$	76		$	75
Weighted average remaining lease term (in years)		1.51			1.61
Weighted average discount rate		5.00	%		5.00	%

Summary of Future Minimum Lease Payments

Future minimum lease payments for the three months ending March 31, are as follows:


	Amount
Year Ending
Remainder of 2021	$	227
2022		317
2023		8
2024		1
Interest		(20	)

Total	$	533

Loss Per Share (Tables)

3 Months Ended

Mar. 31, 2021

Earnings Per Share [Abstract]

Schedule of Loss Per Share, Basic and Diluted

Basic loss per share were computed using the following common share data for the three months ended March 31:


	Three Months Ended March 31, 2021
Net loss	$	(14,265	)
Basic weighted-average shares outstanding		141,015,213
Dilutive effect of share-based awards		—

Diluted weighted-average shares outstanding		141,015,213

Basic loss per share	$	(0.10	)
Diluted loss per share	$	(0.10	)

Description of Business - Additional Information (Detail) $ / shares in Units, $ in Thousands		3 Months Ended
	Jan. 26, 2021 USD ($) $ / shares shares	Mar. 31, 2021	Mar. 31, 2020 USD ($)	Feb. 22, 2021 USD ($)
Number of years of experience		30 years
Number of current operations		15
Percent of greenhouse gas reduction requirement		60.00%
Sale of stock, Number of shares issued in transaction \| shares	2,702,500
Sale of stock, price per share \| $ / shares	$ 8.50
Sale of stock, Consideration received on transaction	$ 22,971
Cash loan	$ 5,000		$ 8,500
Principal amount of loan				$ 7,140

Summary of Significant Accounting Policies - Additional Information (Detail)	3 Months Ended
	Mar. 31, 2021
Accounting Policies [Abstract]
Exchange of shares of the company's common stock	1
Pro rata exchange occurred as of all pre-IPO periods presented	1

Asset Impairment - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Asset Impairment Charges [Abstract]
Impairment loss	$ 626	$ 278

Revenues from Contracts with Customers - Summary of Company's Revenue by Major Source (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	$ 31,447	$ 18,241
RNG [Member]
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	28,123	13,745
REG [Member]
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	3,324	4,496
Natural Gas Commodity [Member]
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	10,671	6,721
Natural Gas Environmental Attributes [Member]
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	17,452	7,024
Electric Commodity [Member]
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	2,273	2,753
Electric Environmental Attributes [Member]
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	1,051	1,743
Goods transferred at a point in time [Member]
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	22,479	10,243
Goods transferred at a point in time [Member] \| RNG [Member]
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	21,428	8,500
Goods transferred at a point in time [Member] \| REG [Member]
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	1,051	1,743
Goods transferred at a point in time [Member] \| Natural Gas Commodity [Member]
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	3,976	1,476
Goods transferred at a point in time [Member] \| Natural Gas Environmental Attributes [Member]
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	17,452	7,024
Goods transferred at a point in time [Member] \| Electric Environmental Attributes [Member]
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	1,051	1,743
Goods transferred over time [Member]
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	8,968	7,998
Goods transferred over time [Member] \| RNG [Member]
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	6,695	5,245
Goods transferred over time [Member] \| REG [Member]
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	2,273	2,753
Goods transferred over time [Member] \| Natural Gas Commodity [Member]
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	6,695	5,245
Goods transferred over time [Member] \| Electric Commodity [Member]
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	$ 2,273	$ 2,753

Accounts and Other Receivables - Schedule of Accounts and Other Receivables (Detail) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Receivables, Net, Current [Abstract]
Accounts receivables	$ 6,691	$ 5,264
Other receivables	179	164
Reimbursable expenses	35	21
Accounts and Other Receivables, Net	$ 6,905	$ 5,449

Property, Plant and Equipment, Net - Summary of Property Plant and Equipment (Detail) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	$ 314,634	$ 313,975
Less: Accumulated depreciation and amortization	(132,325)	(126,929)
Property, Plant & Equipment, Net	182,309	187,046
Buildings and improvements [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	28,070	28,065
Machinery and equipment [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	246,448	246,874
Gas mineral rights [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	34,551	34,551
Construction work in progress [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	$ 5,565	$ 4,485

Property, Plant and Equipment, Net - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Property, Plant and Equipment [Line Items]
Depreciation expense	$ 4,955	$ 4,484
Gas mineral rights [Member]
Property, Plant and Equipment [Line Items]
Adjustment for amortization	$ 491	$ 491

Goodwill And Intangible Assets, Net - Schedule of Intangible Assets (Detail) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Schedule Of Intangible Assets And Goodwill [Line Items]
Goodwill	$ 60	$ 60
Indefinite-lived Intangible Assets (Excluding Goodwill) [Abstract]
Intangible assets with indefinite lives	1,106	1,106
Finite-Lived Intangible Assets, Net [Abstract]
Intangible assets with finite lives	12,576	12,867
Total Goodwill and Intangible Assets	13,742	14,033
Interconnection [Member]
Finite-Lived Intangible Assets, Net [Abstract]
Intangible assets with finite lives	11,834	11,951
Customer Contracts [Member]
Finite-Lived Intangible Assets, Net [Abstract]
Intangible assets with finite lives	742	916
Emissions Allowances [Member]
Indefinite-lived Intangible Assets (Excluding Goodwill) [Abstract]
Intangible assets with indefinite lives	777	777
Land Use Rights [Member]
Indefinite-lived Intangible Assets (Excluding Goodwill) [Abstract]
Intangible assets with indefinite lives	$ 329	$ 329

Goodwill And Intangible Assets, Net - Schedule of Intangible Assets (Detail) (Parenthetical) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Interconnection [Member]
Schedule Of Intangible Assets And Goodwill [Line Items]
Finite lived intangible assets accumulated amortization	$ 2,446	$ 2,329
Customer Contracts [Member]
Schedule Of Intangible Assets And Goodwill [Line Items]
Finite lived intangible assets accumulated amortization	$ 16,541	$ 16,367

Goodwill And Intangible Assets, Net - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Finite-Lived Intangible Assets [Line Items]
Amortization expense	$ 291	$ 374
Customer Contracts [Member]
Finite-Lived Intangible Assets [Line Items]
Finite lived intangible asset useful life	5 years
Interconnection [Member]
Finite-Lived Intangible Assets [Line Items]
Finite lived intangible asset useful life	17 years

Assets Retirement Obligations - Summary of Activity Associated with Asset Retirement Obligations (Detail) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2021	Dec. 31, 2020
Asset Retirement Obligation Disclosure [Abstract]
Asset retirement obligations - beginning of period	$ 5,689	$ 5,928
Accretion expense	119	320
New asset retirement obligations	0	350
Decommissioning	(25)	(909)
Asset retirement obligations - end of period	$ 5,783	$ 5,689

Derivative Instruments - Summary of Realized and Unrealized Gains and Losses of Derivative Instrument (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Derivative [Line Items]
Net gain (loss)	$ 418	$ (1,250)
Commodity Contract [Member] \| Natural Gas and Natural Gas Liquids [Member] \| Sales [Member]
Derivative [Line Items]
Net gain (loss)	0	551
Commodity Contract [Member] \| Natural Gas and Natural Gas Liquids [Member] \| Other Income [Member]
Derivative [Line Items]
Net gain (loss)	0	(388)
Interest Rate Swap [Member] \| Interest Expense [Member]
Derivative [Line Items]
Net gain (loss)	$ 418	$ (1,413)

Fair Value of Financial Instruments - Summary of Assets and Liabilities Measured at Fair Value on a Recurring Basis (Detail) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Asset retirement obligations	$ (5,783)	$ (5,689)	$ (5,928)
Fair Value, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Interest rate swap derivative liabilities	(1,842)	(2,260)
Asset retirement obligations	(5,783)	(5,689)
Pico earn-out liability	(1,920)	(1,920)
Fair Value, Net Asset (Liability)	(9,545)	(9,869)
Fair Value, Recurring [Member] \| Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Interest rate swap derivative liabilities	0	0
Asset retirement obligations	0	0
Pico earn-out liability	0	0
Fair Value, Net Asset (Liability)	0	0
Fair Value, Recurring [Member] \| Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Interest rate swap derivative liabilities	(1,842)	(2,260)
Asset retirement obligations	0	0
Pico earn-out liability	0	0
Fair Value, Net Asset (Liability)	(1,842)	(2,260)
Fair Value, Recurring [Member] \| Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Interest rate swap derivative liabilities	0	0
Asset retirement obligations	(5,783)	(5,689)
Pico earn-out liability	(1,920)	(1,920)
Fair Value, Net Asset (Liability)	$ (7,703)	$ (7,609)

Accrued Liabilities - Summary of Accrued Liabilities (Detail) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Payables and Accruals [Abstract]
Accrued expenses	$ 3,613	$ 4,975
Payroll and related benefits	1,543	2,341
Royalty	2,705	2,620
Utility	1,063	1,147
Other	631	456
Accrued Liabilities	$ 9,555	$ 11,539

Debt - Summary of Company Debt (Detail) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Debt Instrument [Line Items]
Less: current principal maturities	$ (10,000)	$ (10,000)
Less: debt issuance costs (on long-term debt)	(334)	(429)
Long-term Debt	53,863	56,268
Current Portion of Long- term Debt	9,536	9,492
Debt, Long-term and Short-term, Combined Amount	63,399	65,760
Term Loans [Member]
Debt Instrument [Line Items]
Term Loans	27,500	30,000
Long-term Debt	27,500
Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Term Loans	$ 36,697	$ 36,697

Debt - Additional Information (Detail) - USD ($) $ in Thousands			3 Months Ended		12 Months Ended
	Sep. 21, 2019	Sep. 12, 2019	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Extinguishment of Debt [Line Items]
Line of Credit Facility, Interest Rate During Period			2.926%		2.961%
Payments of Debt Issuance Costs			$ 1,821
Debt Issuance Costs, costs paid to the lenders			836
Debt Issuance Costs, costs paid as arranger fees			985
Debt Issuance Costs, Net			364
Debt Issuance Costs, capitalized			1,457
Legal Fees			59
Amortized debt issuance expense			137	$ 187
Capitalized interest			0		$ 361
Long-term Debt			53,863		$ 56,268
Term Loans [Member]
Extinguishment of Debt [Line Items]
Debt Instrument Collateral Amount			95,000
Long-term Debt			27,500
Revolving Credit Facility [Member]
Extinguishment of Debt [Line Items]
Line of Credit			36,697
Line of Credit Facility, Current Borrowing Capacity			37,537
Debt Instrument Collateral Amount			90,000
Letter of Credit [Member]
Extinguishment of Debt [Line Items]
Line of Credit Facility, Maximum Amount Outstanding During Period			5,765
MEH [Member] \| Second Amendment [Member]
Extinguishment of Debt [Line Items]
Line of Credit		$ 80,000
Repayments of Lines of Credit	$ 38,250
MEH [Member] \| Term Loans [Member]
Extinguishment of Debt [Line Items]
Debt Instrument, Periodic Payment, Principal		$ 2,500	$ 2,500
Debt Instrument, Maturity Date		Dec. 12, 2023	Dec. 12, 2023

Income Taxes - Schedule of Effective Income Tax Rate Reconciliation (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Income Tax Disclosure [Abstract]
Provision for income taxes	$ 1,382	$ (10,787)
Effective tax rate	(10.70%)	217.00%

- Definition

Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

+ References + Details

Income Taxes - Additional Information (Detail)	3 Months Ended
Income Taxes - Additional Information (Detail)	Mar. 31, 2021	Mar. 31, 2020
Income Tax Disclosure [Abstract]
Effective tax rate, U.S. federal statutory rate	21.00%
Effective tax rate	(10.70%)	217.00%

Share-Based Compensation - Summary of Fair Value of MRI EICP Options and Valuation Assumptions (Detail) - MRI EICP [Member]	3 Months Ended
	Mar. 31, 2021 $ / shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Risk-free interest rate	0.50%
Expected volatility	32.00%
Expected option life	5 years 6 months
Grant-date fair value	$ 3.44

Share-Based Compensation - Summary of Outstanding Activity of Options,Restricted Stock and Restricted Stock Units under MRI EICP (Detail) - MRI EICP [Member]	3 Months Ended
	Mar. 31, 2021 $ / shares shares
Restricted Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of Shares, Beginning of period \| shares	0
Number of Shares, Granted \| shares	2,092,836
Number of Shares, Vested \| shares	(950,214)
Number of Shares, End of period \| shares	1,142,622
Weighted Average Grant Date Fair Value, Beginning of period \| $ / shares	$ 0
Weighted Average Grant Date Fair Value, Granted \| $ / shares	11.38
Weighted Average Grant Date Fair Value, Vested \| $ / shares	11.38
Weighted Average Grant Date Fair Value, End of period \| $ / shares	$ 11.38
Restricted Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of Shares, Beginning of period \| shares	0
Number of Shares, Granted \| shares	29,568
Number of Shares, Forfeited \| shares	(792)
Number of Shares, End of period \| shares	28,776
Weighted Average Grant Date Fair Value, Beginning of period \| $ / shares	$ 0
Weighted Average Grant Date Fair Value, Granted \| $ / shares	11.38
Weighted Average Grant Date Fair Value, Forfeited \| $ / shares	11.38
Weighted Average Grant Date Fair Value, End of period \| $ / shares	$ 11.38
Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of Shares, Beginning of period \| shares	0
Number of Shares, Granted \| shares	950,214
Number of Shares, Vested \| shares	0
Number of Shares, Forfeited \| shares	0
Number of Shares, End of period \| shares	950,214
Weighted Average Grant Date Fair Value, Beginning of period \| $ / shares	$ 0
Weighted Average Grant Date Fair Value, Granted \| $ / shares	11.38
Weighted Average Grant Date Fair Value, Vested \| $ / shares	0
Weighted Average Grant Date Fair Value, Forfeited \| $ / shares	0
Weighted Average Grant Date Fair Value, End of period \| $ / shares	$ 11.38

Share-Based Compensation - Summary of Outstanding Activity of Options and Restricted Stock under SAR Plan (Detail) - SAR Plan [Member]	3 Months Ended
	Mar. 31, 2021 $ / shares shares
Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of Shares, Beginning of period \| shares	1,872,534
Number of Shares, Exercised \| shares	(50,000)
Number of Shares, End of period \| shares	1,822,534
Weighted Average Exercise Price, Beginning of period \| $ / shares	$ 1.18
Weighted Average Exercise Price, Exercised \| $ / shares	0.44
Weighted Average Exercise Price, End of period \| $ / shares	$ 1.20
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of Shares, Beginning of period \| shares	1,939,200
Number of Shares, Exercised \| shares	0
Number of Shares, End of period \| shares	1,939,200
Weighted Average Exercise Price, Beginning of period \| $ / shares	$ 0.95
Weighted Average Exercise Price, Exercised \| $ / shares	0
Weighted Average Exercise Price, End of period \| $ / shares	$ 0.95

Share-Based Compensation - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands		3 Months Ended
	Jan. 31, 2021	Mar. 31, 2021
SAR Plan [Member]
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Share based compensation expense	$ 82	$ 230
SAR Plan [Member] \| General and Administrative Expense [Member]
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Share based compensation expense		2,050
MRI EICP [Member]
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Common stock shares withheld	950,214
Exercise price of common stock	$ 11.38
Unrecognised compensation expense		$ 14,900
Unrecognised compensation expense recognised, Period		5 years
MRI EICP [Member] \| Section 83 (B) [Member]
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Common stock shares withheld		950,214
MRI EICP [Member] \| General and Administrative Expense [Member]
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Share based compensation expense		$ 1,654
MRI EICP [Member] \| General and Administrative Expense [Member] \| Section 83 (B) [Member]
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Share based compensation expense		$ 10,813

Defined Contribution Plan - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Defined Benefit Plan Disclosure [Line Items]
Defined contribution plan, employer matching contribution, percent of match	50.00%
Defined contribution plan, employer matching contribution, percent of employees' gross pay	4.00%
Defined contribution plan, cost	$ 135	$ 108
Safe Harbor Contribution [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined contribution plan, maximum annual contributions per employee, percent	3.00%
Defined contribution plan, employer matching contribution, vesting period	4 years

Segment Information - Summary of Reconciliation of the Company's Reportable Segments' Net Income from Continuing Operations (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Total Revenue	$ 31,447	$ 18,403
Net Income (Loss)	(14,265)	5,816
EBITDA	(6,500)	2,591
Adjusted EBITDA	(5,786)	3,257
Total Assets	253,362	255,790	$ 253,356
Capital Expenditure	1,335	5,204
Depreciation and amortization	5,737	5,348
Interest expense	646	2,214
Income tax expense (benefit)	1,382	(10,787)
Impairment loss	626	278
Transaction costs	88
Non-cash hedging charges		388
RNG [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Total Revenue	28,123	13,425
Net Income (Loss)	10,561	1,158
EBITDA	14,779	4,628
Adjusted EBITDA	14,779	4,628
Total Assets	157,436	137,268
Capital Expenditure	1,306	4,105
Depreciation and amortization	4,218	3,470
REG [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Total Revenue	3,324	4,496
Net Income (Loss)	(2,241)	(519)
EBITDA	(765)	1,318
Adjusted EBITDA	(139)	1,596
Total Assets	50,156	81,809
Capital Expenditure	23	1,060
Depreciation and amortization	1,474	1,835
Income tax expense (benefit)	2	2
Impairment loss	626	278
Corporate [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Total Revenue		482
Net Income (Loss)	(22,585)	5,177
EBITDA	(20,514)	(3,355)
Adjusted EBITDA	(20,426)	(2,967)
Total Assets	45,770	36,713
Capital Expenditure	6	39
Depreciation and amortization	45	43
Interest expense	646	2,214
Income tax expense (benefit)	1,380	(10,789)
Transaction costs	$ 88
Non-cash hedging charges		$ 388

Segment Information - Summary of Revenue by Major Customers (Detail) - Customer Concentration Risk [Member]	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Customer A [Member]
Revenue, Major Customer [Line Items]
Concentration risk, percentage	13.10%	20.60%
Customer B [Member]
Revenue, Major Customer [Line Items]
Concentration risk, percentage	10.00%	18.60%
Customer C [Member]
Revenue, Major Customer [Line Items]
Concentration risk, percentage	11.00%	15.70%
Customer D [Member]
Revenue, Major Customer [Line Items]
Concentration risk, percentage	26.20%
RNG [Member] \| Customer A [Member]
Revenue, Major Customer [Line Items]
Concentration risk, percentage	13.10%
RNG [Member] \| Customer B [Member]
Revenue, Major Customer [Line Items]
Concentration risk, percentage	10.00%	18.60%
RNG [Member] \| Customer C [Member]
Revenue, Major Customer [Line Items]
Concentration risk, percentage	11.00%	15.70%
RNG [Member] \| Customer D [Member]
Revenue, Major Customer [Line Items]
Concentration risk, percentage	26.20%
REG [Member] \| Customer A [Member]
Revenue, Major Customer [Line Items]
Concentration risk, percentage		20.60%
Corporate [Member] \| Customer A [Member]
Revenue, Major Customer [Line Items]
Concentration risk, percentage

Leases - Summary of Supplemental Information Related To Operating Leases (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Leases [Abstract]
Cash paid for amounts included in the measurement of operating lease liabilities	$ 76	$ 75
Weighted average remaining lease term (in years)	1 year 6 months 3 days	1 year 7 months 9 days
Weighted average discount rate	5.00%	5.00%

Leases - Summary of Future Minimum Lease Payments (Detail) $ in Thousands	Mar. 31, 2021 USD ($)
Leases [Abstract]
Remainder of 2021	$ 227
2022	317
2023	8
2024	1
Interest	(20)
Total	$ 533

Loss Per Share - Schedule of Loss Per Share, Basic and Diluted (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Earnings Per Share [Abstract]
Net loss	$ (14,265)	$ 5,816
Basic weighted-average shares outstanding	141,015,213
Dilutive effect of share-based awards	0
Diluted weighted-average shares outstanding	141,015,213
Basic loss per share	$ (0.10)
Diluted loss per share	$ (0.10)

- Definition

The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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- Definition

The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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- Definition

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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+ Details

Loss Per Share - Additional Information (Detail)	3 Months Ended
Loss Per Share - Additional Information (Detail)	Mar. 31, 2021 shares
Earnings Per Share [Abstract]
Antidilutive excluded from diluted net loss per share	2,121,612

Related Party Transactions - Additional Information (Detail) $ in Thousands	Mar. 31, 2021 USD ($)
Related Party Transactions [Abstract]
Related party receivable	$ 7,140

Subsequent Events - Additional Information (Detail) - Subsequent Event [Member] $ in Thousands	May 10, 2021 USD ($)
Subsequent Event [Line Items]
Payments to acquire businesses	$ 3,797
Number of restricted stock awards business acquisation	2