Infrastructure and Energy Alternatives (IEA) 10-Q 9 May 22 2022 Q1 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	3 Months Ended
	Mar. 31, 2022	May 09, 2022
Entity Central Index Key	0001652362
Document Fiscal Year Focus	2022
Amendment Flag	false
Current Fiscal Year End Date	--12-31
Document Fiscal Period Focus	Q1
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Mar. 31, 2022
Document Transition Report	false
Entity File Number	001-37796
Entity Registrant Name	Infrastructure & Energy Alternatives, Inc.
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	47-4787177
Entity Address, Address Line One	6325 Digital Way
Entity Address, Address Line Two	Suite 460
Entity Address, City or Town	Indianapolis
Entity Address, State or Province	IN
Entity Address, Postal Zip Code	46278
City Area Code	800
Local Phone Number	688-3775
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		48,323,406
Common Stock, $0.0001 par value
Title of 12(b) Security	Common Stock, $0.0001 par value
Trading Symbol	IEA
Security Exchange Name	NASDAQ
Warrants for Common Stock
Title of 12(b) Security	Warrants for Common Stock
Trading Symbol	IEAWW
Security Exchange Name	NASDAQ

Condensed Consolidated Balance

Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Current assets:
Cash and cash equivalents	$ 28,732	$ 124,027
Accounts receivable, net	254,540	280,700
Contract assets	220,119	214,298
Prepaid expenses and other current assets	73,070	42,774
Total current assets	576,461	661,799
Property, plant and equipment, net	148,486	138,605
Operating lease assets	35,904	37,292
Intangible assets, net	17,352	18,969
Goodwill	37,373	37,373
Company-owned life insurance	4,786	4,944
Deferred income taxes	3,226	0
Other assets	771	771
Total assets	824,359	899,753
Current liabilities:
Accounts payable	131,415	164,925
Accrued liabilities	128,832	163,364
Contract liabilities	148,452	126,128
Current portion of finance lease obligations	24,778	24,345
Current portion of operating lease obligations	10,401	10,254
Current portion of long-term debt	1,573	1,960
Total current liabilities	445,451	490,976
Finance lease obligations, less current portion	38,714	30,096
Operating lease obligations, less current portion	27,049	28,540
Long-term debt, less current portion	290,891	290,730
Warrant obligations	7,395	5,967
Deferred compensation	7,658	7,988
Deferred income taxes	0	8,199
Total liabilities	817,158	862,496
Commitments and contingencies (Note 7)
Stockholders' equity:
Common stock, par value, $0.0001 per share; 150,000,000 and 150,000,000 shares authorized; 48,323,406 and 48,027,359 shares issued and 48,323,406 and 48,027,359 outstanding at March 31, 2022 and December 31, 2021, respectively	4	4
Additional paid in capital	243,465	246,450
Accumulated deficit	(236,268)	(209,197)
Total stockholders' equity	7,201	37,257
Total liabilities and stockholders' equity	$ 824,359	$ 899,753
Common stock, par value (in dollars per share)	$ 0.0001	$ 0.0001
Common stock, shares authorized	150,000,000	150,000,000
Common stock, shares, issued	48,323,406	48,027,359
Common stock, shares, outstanding	48,323,406	48,027,359

Condensed Consolidated Balanc_2

Condensed Consolidated Balance Sheets (Parenthetical) - $ / shares	Mar. 31, 2022	Dec. 31, 2021
Statement of Financial Position [Abstract]
Common stock, par value (in dollars per share)	$ 0.0001	$ 0.0001
Common stock, shares authorized	150,000,000	150,000,000
Common stock, shares, issued	48,323,406	48,027,359
Common stock, shares, outstanding	48,323,406	48,027,359

Condensed Consolidated Statemen

Condensed Consolidated Statement of Operations - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Earnings Per Share, Basic	$ (0.56)	$ (0.91)
Earnings Per Share, Diluted	$ (0.56)	$ (0.91)
Revenue	$ 360,095	$ 276,412
Cost of revenue	356,265	259,871
Gross profit	3,830	16,541
Selling, general and administrative expenses	34,882	24,846
Loss from operations	(31,052)	(8,305)
Other income (expense), net:
Interest expense, net	(6,026)	(14,359)
Warrant liability fair value adjustment	(1,428)	(300)
Other income	11	138
Loss before benefit for income taxes	(38,495)	(22,826)
Benefit for income taxes	11,424	2,392
Net loss	(27,071)	(20,434)
Less: Convertible Preferred Stock dividends	0	656
Net loss available for common stockholders	$ (27,071)	$ (21,090)
Earnings Per Share, Basic	$ (0.56)	$ (0.91)
Earnings Per Share, Diluted	$ (0.56)	$ (0.91)
Weighted average shares - basic and diluted	48,129,331	23,057,731

Condensed Statements of Stockho

Condensed Statements of Stockholders Equity (Deficit) Statement - USD ($) shares in Thousands, $ in Thousands	Total	Common Stock, $0.0001 par value	Common Stock, $0.0001 par valueCommon Stock, $0.0001 par value	Additional Paid-in Capital	Accumulated Deficit
Beginning Balance Shares, Issued at Dec. 31, 2020		21,009
Beginning Balance Stockholder's equity at Dec. 31, 2020	$ (90,161)	$ 2		$ 35,305	$ (125,468)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss	(20,434)				(20,434)
Earnout Shares			1,803
Share-based compensation	727			727
Equity plan compensation			521
Restricted Stock, Value, Shares Issued Net of Tax Withholdings	(2,909)			(2,909)
Exercise of warrants			15
Series A Preferred dividends	(656)			(656)
Repurchases of public warrants	0
Ending Balance Shares, Issued at Mar. 31, 2021		23,348
Ending Balance Stockholder's equity at Mar. 31, 2021	(113,433)	$ 2		32,467	(145,902)
Beginning Balance Shares, Issued at Dec. 31, 2021		48,027
Beginning Balance Stockholder's equity at Dec. 31, 2021	37,257	$ 4		246,450	(209,197)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss	(27,071)				(27,071)
Share-based compensation	1,630			1,630
Equity plan compensation			296
Restricted Stock, Value, Shares Issued Net of Tax Withholdings	(1,810)			(1,810)
Repurchases of public warrants	(2,805)			(2,805)
Ending Balance Shares, Issued at Mar. 31, 2022		48,323
Ending Balance Stockholder's equity at Mar. 31, 2022	$ 7,201	$ 4		$ 243,465	$ (236,268)

Condensed Consolidated Statem_2

Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Cash flows from operating activities:
Net loss	$ (27,071)	$ (20,434)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization	12,286	10,799
Warrant liability fair value adjustment	1,428	300
Amortization of debt discounts and issuance costs	377	2,859
Share-based compensation expense	1,630	727
Deferred income taxes	(11,424)	(2,392)
Other, net	(572)	(902)
Change in operating assets and liabilities:
Accounts receivable	26,160	(7,513)
Contract assets	(5,821)	(1,513)
Prepaid expenses and other assets	(30,296)	(27,304)
Accounts payable and accrued liabilities	(68,042)	(31,593)
Contract liabilities	22,324	23,186
Net cash used in operating activities	(79,021)	(53,780)
Cash flow from investing activities:
Company-owned life insurance	158	(269)
Purchases of property, plant and equipment	(4,788)	(3,920)
Proceeds from sale of property, plant and equipment	553	667
Net cash used in investing activities	(4,077)	(3,522)
Cash flows from financing activities:
Proceeds from line of credit - long term	10,000	0
Payments on line of credit - long term	10,000	0
Payments on long-term debt	(603)	(686)
Payments on finance lease obligations	6,979	7,971
Shares for tax withholding on release of restricted stock units	(1,810)	(2,909)
Repurchases of public warrants	(2,805)	0
Net cash used in financing activities	(12,197)	(11,566)
Net change in cash and cash equivalents	(95,295)	(68,868)
Cash and cash equivalents, beginning of the period	124,027	164,041
Cash and cash equivalents, end of the period	28,732	95,173
Supplemental disclosure of cash and non-cash transactions:
Cash paid for interest	10,618	10,691
Cash (received) for income taxes	(145)	(290)
Right-of-Use Asset Obtained in Exchange for Finance Lease Liability	16,030	2,183
Right-of-Use Asset Obtained in Exchange for Operating Lease Liability	1,360	1,101
Dividends, Preferred Stock	$ 0	$ 656

Business, Basis of Presentation

Business, Basis of Presentation and Significant Accounting Policies	3 Months Ended
	Mar. 31, 2022
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Organization, Consolidation and Presentation of Financial Statements Disclosure and Significant Accounting Policies	Business, Basis of Presentation and Significant Accounting Policies Infrastructure and Energy Alternatives, Inc. (f/k/a M III Acquisition Corporation ("M III")), a Delaware corporation, is a holding company organized on August 4, 2015 (together with its wholly owned subsidiaries, unless otherwise noted or the context otherwise requires, "IEA" or the "Company"). The Company specializes in providing complete engineering, procurement and construction services throughout the United States ("U.S.") for the renewable energy, traditional power and civil infrastructure industries. These services include the design, site development, construction, installation and restoration of infrastructure. The Company has historically focused on the wind industry, but has recently focused on further expansion into the solar market and with its 2018 acquisitions expanded its construction capabilities and geographic footprint in the areas of renewables, environmental remediation, industrial maintenance, specialty paving, and heavy civil and rail infrastructure construction, creating a diverse national platform of specialty construction capabilities. Reportable Segments The Company has two reportable segments: the Renewables ("Renewables") segment and the Heavy Civil and Industrial ("Specialty Civil") segment. See Note 10. Segments for a description of the reportable segments and their operations. Principles of Consolidation The accompanying unaudited condensed consolidated financial statements have been prepared in accordance with accounting principles generally accepted in the U.S. ("GAAP") for interim financial information and with the instructions for Quarterly Reports on Form 10-Q and Rule 10-01 of Regulation S-X. Pursuant to these rules and regulations, certain information and footnote disclosures normally included in the annual audited consolidated financial statements prepared in accordance with GAAP have been condensed or omitted. The unaudited condensed consolidated financial statements include the accounts of IEA and its wholly owned domestic and foreign subsidiaries. The Company occasionally forms joint ventures with unrelated third parties for the execution of single contracts or projects. The Company assesses its joint ventures to determine if they meet the qualifications of a variable interest entity ("VIE") in accordance with Accounting Standard Codification Topic 810, Consolidation ("ASC 810"). For construction joint ventures that are not VIEs or fully consolidated but for which the Company has significant influence, the Company accounts for its interest in the joint ventures using the proportionate consolidation method, see Note 11. Joint Ventures. In the opinion of management, these financial statements reflect all adjustments (consisting of normal recurring adjustments) that are necessary to present fairly the results of operations for the interim periods presented. The results of operations for the three months ended March 31, 2022 are not necessarily indicative of the results that may be expected for the year ending December 31, 2022. These financial statements should be read in conjunction with the Company’s audited consolidated financial statements for the year ended December 31, 2021 and notes thereto included in the Company’s 2021 Annual Report on Form 10-K filed with the SEC on March 7, 2022 (the "Annual Report"). Basis of Accounting and Use of Estimates The accompanying unaudited condensed consolidated financial statements have been prepared in accordance with GAAP. The preparation of the condensed consolidated financial statements in conformity with GAAP requires the use of estimates and assumptions that affect the amounts reported in the condensed consolidated financial statements and the accompanying notes. Key estimates include: the recognition of revenue and project profit or loss; fair value estimates related to warrant liabilities; valuations of goodwill and intangible assets; asset lives used in computing depreciation and amortization; accrued self-insured claims; other reserves and accruals; accounting for income taxes; and the estimated impact of contingencies and ongoing litigation. While management believes that its estimates are reasonable when considered in conjunction with the Company’s consolidated financial position and results of operations, actual results could differ materially from those estimates. The prior period classification of the warrant liability fair value adjustment for the Series B Preferred Stock - Anti-dilution warrants has been revised to conform to the current period presentation within the condensed consolidated statements of operations. This reclassification has no effect on net income or stockholders' equity. Revenue Recognition The Company derives revenue primarily from construction projects performed under contracts for specific projects requiring the construction and installation of an entire infrastructure system or specified units within an infrastructure system. Contracts contain multiple pricing options, such as fixed price, unit price, or time and materials. Generally, renewable energy projects are performed for private customers while Specialty Civil projects are performed for various governmental entities. Revenue derived from projects billed on a fixed-price basis totaled 74.0% and 78.7% of consolidated revenue from operations for the three months ended March 31, 2022 and 2021, respectively. Revenue derived from projects billed on a unit price basis totaled 24.9% and 17.5% of consolidated revenue from operations for the three months ended March 31, 2022 and 2021, respectively. Revenue and related costs for contracts billed on a time and materials basis are recognized as the services are rendered. Revenue derived from projects billed on a time and materials basis totaled 1.1% and 3.8% of consolidated revenue from operations for the three months ended March 31, 2022 and 2021, respectively. The prior period presentation of the components of the Company’s revenue by contract type has been revised to conform to the current presentation. Construction contract revenue is recognized over time using the cost-to-cost measure of progress for fixed price contracts. The cost-to-cost measure of progress best depicts the continuous transfer of control of goods or services to the customer. The contractual terms provide that the customer compensates the Company for services rendered. Contract costs include all direct materials, labor and subcontracted costs, as well as indirect costs related to contract performance, such as indirect labor, supplies, tools, repairs and the costs of capital equipment. The cost estimation and review process for recognizing revenue over time under the cost-to-cost method is based on the professional knowledge and experience of the Company’s project managers, engineers and financial professionals. Management reviews estimates of total contract transaction price and total project costs on an ongoing basis. Changes in job performance, job conditions and management’s assessment of expected variable consideration are factors that influence estimates of the total contract transaction price, total costs to complete those contracts and profit recognition. Changes in these factors could result in revisions to revenue and costs of revenue in the period in which the revisions are determined on a prospective basis, which could materially affect the Company’s results of operations for that period. Provisions for losses on uncompleted contracts are recorded in the period in which such losses are determined. Performance Obligations A performance obligation is a contractual promise to transfer a distinct good or service to the customer and is the unit of account under ASC Topic 606, Revenue from Contracts with Customers . The transaction price of a contract is allocated to distinct performance obligations and recognized as revenue when or as the performance obligations are satisfied. The Company’s contracts often require significant integrated services and, even when delivering multiple distinct services, are generally accounted for as a single performance obligation. Contract amendments and change orders are generally not distinct from the existing contract due to the significant integrated service provided in the context of the contract and are accounted for as a modification of the existing contract and performance obligation. With the exception of certain Specialty Civil service contracts, the majority of the Company’s performance obligations are generally completed within one year. When more than one contract is entered into with the same customer on or close to the same date, the Company evaluates whether those contracts should be combined and accounted for as a single contract, as well as whether those contracts should be accounted for as more than one performance obligation. This evaluation requires significant judgment and is based on the facts and circumstances of the various contracts, which could change the amount of revenue and profit recognition in a given period depending upon the outcome of the evaluation. Remaining performance obligations represent the amount of unearned transaction prices for contracts, including approved and unapproved change orders. As of March 31, 2022, the amount of the Company’s remaining performance obligations was $2.1 billion. The Company expects to recognize approximately 81.7% of its remaining performance obligations as revenue during the next twelve months. Revenue recognized from performance obligations satisfied in previous periods was $(12.9) million and $0.4 million for the three months ended March 31, 2022 and 2021, respectively. Variable Consideration Transaction pricing for the Company’s contracts may include variable consideration, such as unapproved change orders, claims, incentives and liquidated damages. Management estimates variable consideration for a performance obligation utilizing estimation methods that best predict the amount of consideration to which the Company will be entitled. Variable consideration is included in the estimated transaction price to the extent it is probable that a significant reversal of cumulative revenue recognized will not occur when the uncertainty associated with the variable consideration is resolved. Management’s estimates of variable consideration and determination of whether to include estimated amounts in the transaction price are based on legal opinions, past practices with the customer, specific discussions, correspondence or preliminary negotiations with the customer and all other relevant information that is reasonably available. The effect of a change in variable consideration on the transaction price of a performance obligation is typically recognized as an adjustment to revenue on a cumulative catch-up basis. To the extent unapproved change orders, claims and liquidated damages reflected in the transaction price are not resolved in the Company’s favor, or to the extent incentives reflected in the transaction price are not earned, there could be reductions in, or reversals of, previously recognized revenue. As of March 31, 2022 and December 31, 2021, the Company included approximately $93.5 million and $94.5 million, respectively, of estimated transaction price adjustments that arise from unapproved change orders in process of being resolved in the normal course of business and/or from transaction price disputes in contracts that are subject to resolution through litigation, arbitration and other legal proceedings. These transaction price adjustments are included within Contract Assets or Contract Liabilities in the Company’s condensed consolidated balance sheets as appropriate. The Company actively engages with its customers to complete the final approval process on unapproved change orders and generally expects these processes to be completed within one year, while sometimes disputes subject to formal legal proceedings can take longer than a year to resolve. Amounts ultimately realized upon resolution with customers of these transaction price adjustments could be higher or lower than such estimated amounts. Disaggregation of Revenue The following tables disaggregate revenue by customers and services performed, which the Company believes best depicts the nature, amount, timing and uncertainty of its revenue: (in thousands) Three Months Ended March 31, 2022 March 31, 2021 Renewables Segment Wind $ 117,932 $ 146,858 Solar 125,682 33,516 $ 243,614 $ 180,374 Specialty Civil Segment Heavy civil $ 54,246 $ 48,871 Rail 14,681 26,868 Environmental 47,554 20,299 $ 116,481 $ 96,038 Concentrations Each of the Company's renewable projects is generally considered an individual customer because, typically, each project's developer forms its own project legal entity. The following table provides the approximate revenue and accounts receivable concentrations, net of allowances, for Renewables and Specialty Civil customers that accounted for 10% of the Company's revenue or accounts receivable for the periods indicated: Revenue % Three Months Ended Accounts Receivable % March 31, 2022 March 31, 2021 March 31, 2022 December 31, 2021 Company A (Renewables Segment) 10.0 % * * * * Amount was not above 10% threshold Construction Joint Ventures Certain contracts are executed through joint ventures. The arrangements are often formed for the execution of single contracts or projects and allow the Company to share risks and secure specialty skills required for project execution. In accordance with ASC 810, the Company assesses its joint ventures at inception to determine if they meet the qualifications of a VIE. The Company considers a joint venture a VIE if either (a) the total equity investment is not sufficient to permit the entity to finance its activities without additional subordinated financial support, (b) characteristics of a controlling financial interest are missing (either the ability to make decisions through voting or other rights, the obligation to absorb the expected losses of the entity or the right to receive the expected residual returns of the entity), or (c) the voting rights of the equity holders are not proportional to their obligations to absorb the expected losses of the entity and/or their rights to receive the expected residual returns of the entity and substantially all of the entity’s activities either involve or are conducted on behalf of an investor that has disproportionately few voting rights. Upon the occurrence of certain events outlined in ASC 810, the Company reassesses its initial determination of whether the joint venture is a VIE. The Company also evaluates whether it is the primary beneficiary of each VIE and consolidates the VIE if the Company has both (a) the power to direct the economically significant activities of the entity and (b) the obligation to absorb losses of, or the right to receive benefits from, the entity that could potentially be significant to the VIE. The Company considers the contractual agreements that define the ownership structure, distribution of profits and losses, risks, responsibilities, indebtedness, voting rights and board representation of the respective parties in determining whether it qualifies as the primary beneficiary. The Company also considers all parties that have direct or implicit variable interests when determining whether it is the primary beneficiary. When the Company is determined to be the primary beneficiary, the VIE is consolidated. In accordance with ASC 810, management’s assessment of whether the Company is the primary beneficiary of a VIE is performed continuously. Construction joint ventures that do not involve a VIE, or for which the Company is not the primary beneficiary, are evaluated for consolidation under the voting interest model that considers whether the Company owns or controls more than 50% of the voting interest in the joint venture. For construction joint ventures that are not consolidated but for which the Company has significant influence, the Company accounts for its interest in the joint ventures using the proportionate consolidation method, whereby the Company’s proportionate share of the joint ventures’ assets, liabilities, revenue and cost of operations are included in the appropriate classifications in the Company’s condensed consolidated financial statements. See Note 11. Joint Ventures for additional discussion regarding joint ventures. Recently Issued Accounting Standards Not Yet Adopted Management has evaluated other recently issued accounting pronouncements and does not believe that they will have a significant impact on the condensed consolidated financial statements or related disclosures. COVID-19 Pandemic The Company believes that the COVID-19 pandemic did not have a material adverse impact on the Company’s financial results for the three months ended March 31, 2022 and 2021, respectively . Currently, most of the Company’s construction services are deemed essential under governmental mitigation orders and both of the Company's business segments continue to operate. The Company has issued several notices of force majeure for the purpose of recognizing delays in construction schedules due to COVID-19 outbreaks on certain of its work sites and has also received notices of force majeure from the owners of certain projects and certain subcontractors. Management does not believe that any delays on projects related to these events of force majeure will have a material impact on the Company's results of operations. The effects of the COVID-19 pandemic could affect the Company’s future business activities and financial results, including new contract awards, reduced crew productivity, contract amendments or cancellations, higher operating costs or delayed project start dates or project shutdowns that may be requested or mandated by governmental authorities or others. Management believes that it is taking appropriate steps to mitigate any potential impact to the Company; however, given the uncertainty regarding the potential effects of the COVID-19 pandemic, any future impacts cannot be quantified or predicted with specificity.

Contract Assets and Liabilities

Contract Assets and Liabilities	3 Months Ended
	Mar. 31, 2022
Contractors [Abstract]
Contract Assets and Liabilities	Contract Assets and Liabilities and Accounts Receivable, Net The Company bills its customers based on contractual terms, including milestone billings based on the completion of certain phases of the work. Sometimes, billing occurs after revenue recognition, resulting in unbilled revenue, which is accounted for as a contract asset. Sometimes the Company receives advance mobilization payments from its customers before revenue is recognized, resulting in deferred revenue, which is accounted for as a contract liability. Contract assets in the condensed consolidated balance sheets represents the following: • costs and estimated earnings in excess of billings, which arise when revenue has been recorded but the amount has not been billed; and • retainage amounts for the portion of the contract price earned by us for work performed but held for payment by the customer as a form of security until the Company reaches certain construction milestones or completes the project. Contract assets consisted of the following as of the dates indicated: (in thousands) March 31, 2022 December 31, 2021 Costs and estimated earnings in excess of billings on uncompleted contracts $ 140,805 $ 120,900 Retainage receivable 79,314 93,398 $ 220,119 $ 214,298 Contract assets as of March 31, 2022 include approximately $33.5 million for transaction price disputes in which the Company is pursuing settlement through dispute resolution and arbitration. The Company believes that these disputed amounts are collectible and recoverable under the applicable contracts. See Note 1. Business, Basis of Presentation and Significant Accounting Policies for further discussion of revenue recognized on variable consideration. Contract liabilities consisted of the following as of the dates indicated: (in thousands) March 31, 2022 December 31, 2021 Billings in excess of costs and estimated earnings on uncompleted contracts $ 147,931 $ 125,658 Loss on contracts in progress 521 470 $ 148,452 $ 126,128 Revenue recognized for the three months ended March 31, 2022 that was included in the contract liability balance at December 31, 2021 was approximately $89.0 million, and revenue recognized for the three months ended March 31, 2021 that was included in the contract liability balance at December 31, 2020 was approximately $87.8 million. Accounts Receivable and Allowance for Credit Losses Activity in the allowance for credit losses for the periods indicated was as follows: Three Months Ended March 31, (in thousands) 2022 2021 Allowance for credit losses at beginning of period $ — $ — Plus: provision for (reduction in) allowance — — Less: write-offs, net of recoveries — — Allowance for credit losses at period end $ — $ — Accounts Receivable at March 31, 2022, includes $18.3 million for transaction price disputes discussed as a part of contract assets. The Company is pursuing settlement through arbitration and believes that this amount is fully recoverable but cannot guarantee the timing of the collection due to the pending arbitration.

Property, plant and equipment,

Property, plant and equipment, net	3 Months Ended
	Mar. 31, 2021
Property, Plant and Equipment [Abstract]
Property, plant and equipment, net	Property, Plant and Equipment, Net Property, plant and equipment consisted of the following as of the dates indicated: (in thousands) March 31, 2022 December 31, 2021 Buildings and leasehold improvements $ 6,540 $ 6,884 Land 17,600 17,600 Construction equipment 245,627 227,807 Office equipment, furniture and fixtures 2,874 3,687 Vehicles 8,448 8,289 Total property, plant and equipment 281,089 264,267 Accumulated depreciation (132,603) (125,662) Property, plant and equipment, net $ 148,486 $ 138,605 Depreciation expense of property, plant and equipment was $10.7 million and $9.2 million for the three months ended March 31, 2022 and 2021, respectively.

Goodwill and Intangible Assets,

Goodwill and Intangible Assets, net (Notes)	3 Months Ended
	Mar. 31, 2022
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill and Intangible Assets Disclosure	Goodwill and Intangible Assets, Net The following table provides the changes in the carrying amount of goodwill, by reporting unit: (in thousands) Renewables Specialty Civil Total January 1, 2021 $ 3,020 $ 34,353 $ 37,373 Adjustments — — — December 31, 2021 $ 3,020 $ 34,353 $ 37,373 Adjustments — — — March 31, 2022 $ 3,020 $ 34,353 $ 37,373 The goodwill recorded in the Company's Specialty Civil reporting unit is deductible for income tax purposes over a 15-year period, with the exception of $2.9 million that is not deductible. Intangible assets consisted of the following as of the dates indicated: March 31, 2022 December 31, 2021 ($ in thousands) Gross Carrying Amount Accumulated Amortization Net Carrying Amount Weighted Average Remaining Life Gross Carrying Amount Accumulated Amortization Net Carrying Amount Weighted Average Remaining Life Customer relationships $ 26,500 $ (13,213) $ 13,287 3.75 years $ 26,500 $ (12,267) $ 14,233 4 years Trade name 13,400 (9,335) 4,065 1.75 years 13,400 (8,664) 4,736 2 years $ 39,900 $ (22,548) $ 17,352 $ 39,900 $ (20,931) $ 18,969 Amortization expense associated with intangible assets for the three months ended March 31, 2022 and 2021, totaled $1.6 million and $1.6 million, respectively. The following table provides the annual intangible amortization expense currently expected to be recognized for the years 2022 through 2025: (in thousands) Remainder of 2022 2023 2024 2025 Amortization expense $ 4,849 $ 5,841 $ 3,785 $ 2,877

Fair value of financial instrum

Fair value of financial instruments	3 Months Ended
	Mar. 31, 2022
Fair Value Disclosures [Abstract]
Fair value of financial instruments	Fair Value of Financial Instruments The Company applies ASC Topic 820, Fair Value Measurement , which establishes a framework for measuring fair value. ASC 820 defines fair value as an exit price, which is the price that would be received for an asset or paid to transfer a liability in the Company’s principal or most advantageous market in an orderly transaction between market participants on the measurement date. The fair value hierarchy established in ASC 820 generally requires an entity to maximize the use of observable inputs and minimize the use of unobservable inputs when measuring fair value. Observable inputs reflect the assumptions that market participants would use in pricing the asset or liability and are developed based on market data obtained from sources independent of the reporting entity. Unobservable inputs reflect the entity’s own assumptions based on market data and the entity’s judgments about the assumptions that market participants would use in pricing the asset or liability and are developed based on the best information available in the circumstances. The valuation hierarchy is composed of three levels. The classification within the valuation hierarchy is based on the lowest level of input that is significant to the fair value measurement. The levels within the valuation hierarchy are described below: Level 1 — Inputs to the fair value measurement are observable inputs, such as quoted prices in active markets for identical assets or liabilities listed on active market exchanges. Level 2 — Inputs to the fair value measurement are determined using prices for recently traded assets and liabilities with similar underlying terms, as well as direct or indirect observable inputs, such as interest rates and yield curves that are observable at commonly quoted intervals. Level 3 — Inputs to the fair value measurement are unobservable inputs, such as estimates, assumptions, and valuation techniques when little or no market data exists for the assets or liabilities. The following table sets forth information regarding the Company's liabilities measured at fair value on a recurring basis: March 31, 2022 December 31, 2021 (in thousands) Level 1 Level 2 Level 3 Total Level 1 Level 2 Level 3 Total Liabilities Private warrants $ — $ 626 $ — $ 626 $ — $ 410 $ — $ 410 Series B Preferred Stock - Anti-dilution warrants — — 6,769 6,769 — — 5,557 5,557 Total liabilities $ — $ 626 $ 6,769 $ 7,395 $ — $ 410 $ 5,557 $ 5,967 The following is a reconciliation of the beginning and ending balances of recurring fair value measurements using Level 3 inputs: (in thousands) Series B Preferred Stock - Anti-dilution warrants Beginning Balance, December 31, 2021 $ 5,557 Fair value adjustment - loss recognized in other income 1,212 Ending Balance, March 31, 2022 $ 6,769 The information below describes the balance sheet classification and the fair value measurement for the Company's liabilities measured at fair value on a recurring basis: Private Warrants (recurring) - The Company has 295,000 private warrants that are not listed on a securities exchange, and the Company adjusts the fair value at the end of each fiscal period using the price on that date multiplied by the remaining private warrants. The private warrants were recorded as warrant obligations at the end of the quarter and the fair value adjustment was recorded as a warrant liability fair value adjustment for the three months ended March 31, 2022. For further discussion see Note 8. Earnings Per Share . Series B Preferred Stock - Anti-dilution Warrants (recurring) - In 2019, the Company entered into three equity purchase agreements and issued Series B Preferred Stock. The agreements provided that upon the conversion of any of the convertible Series A Preferred Stock to shares of common stock, holders of the Series B Preferred Stock would receive additional warrants (anti-dilution warrants) to purchase shares of common stock at a price of $0.0001 per share. The number of shares of common stock attributable to the warrants issued to Series B Preferred Stockholders for anti-dilution warrants was determined as follows: • upon the exercise of any warrant with an exercise price of $11.50 or higher. As of March 31, 2022, the Company had 5,962,020 warrants issued before M III's merger with the Company ("Merger Warrants") outstanding, exercisable for 2,981,010 shares of common stock at $11.50 per share. The conversion of Merger Warrants would result in the issuance of an additional 0.9 million anti-dilution shares pursuant to the anti-dilution warrants. As of March 31, 2022, the Company recorded the anti-dilution warrants at fair value, which was estimated using a Monte Carlo simulation based on certain significant unobservable inputs, such as a risk rate premium, volatility of stock, conversion stock price, current stock price and amount of time remaining before expiration of the Merger Warrants. The calculation derived a fair value of $6.8 million for the liability based on an anti-dilution share fair value of $7.46. Significant unobservable inputs used in the fair value calculation as of the period indicated were as follows: March 31, 2022 Stock price $ 11.85 Conversion stock price $ 11.50 Time before Merger Warrant expiration 0.99 Stock volatility 45.66 % Risk-free interest rate 1.60 % Other financial instruments of the Company not listed in the table consist of cash and cash equivalents, accounts receivable, accounts payable and other current liabilities that approximate their fair values. Additionally, management believes that the carrying value of the Company's outstanding debt balances, further discussed in Note 6. Debt , approximate fair value.

Debt

Debt	3 Months Ended
	Mar. 31, 2022
Debt Disclosure [Abstract]
Debt	Debt Debt consisted of the following obligations as of the dates indicated: (in thousands) March 31, 2022 December 31, 2021 Senior unsecured notes 300,000 300,000 Commercial equipment notes 2,954 3,557 Total principal due for long-term debt 302,954 303,557 Unamortized debt discount and issuance costs (10,490) (10,867) Less: Current portion of long-term debt (1,573) (1,960) Long-term debt, less current portion $ 290,891 $ 290,730 Senior Unsecured Notes On August 17, 2021, IEA Energy Services LLC, a wholly owned subsidiary of the Company ("Services"), issued $300.0 million aggregate principal amount of its 6.625% senior unsecured notes due 2029 (the "Senior Unsecured Notes"), in a private placement. Interest is payable on the Senior Unsecured Notes on each February 15 and August 15, commencing on February 15, 2022. The Senior Unsecured Notes will mature on August 15, 2029. The Senior Unsecured Notes are guaranteed on a senior unsecured basis by the Company and certain of its domestic wholly owned subsidiaries (the "Guarantors"). Credit Agreement On August 17, 2021, Services, as the borrower, and certain guarantors (including the Company), entered into a Credit Agreement (the "Credit Agreement") with a syndicate of lenders and CIBC Bank USA in its capacities as the Administrative and Collateral Agent for the lenders. The Credit Agreement provides for a $150.0 million senior secured revolving credit facility. The Credit Agreement is guaranteed by the Company and certain subsidiaries of the Company (the "Credit Agreement Guarantors" and together with Services, the "Loan Parties") and is secured by a security interest in substantially all of the Loan Parties’ personal property and assets. Services has the ability to increase available borrowing under the credit facility by an additional amount up to $50.0 million subject to certain conditions. Interest rates on the credit facility are based upon (1) an index rate that is established at the highest of the prime rate or the sum of the federal funds rate plus 0.50%, or (2) at Services’ election, a LIBOR rate, plus in either case, an applicable interest rate margin. The applicable interest rate margins are adjusted on a quarterly basis based upon Services’ first lien net leverage within the range of 1.00% to 2.50% for index rate loans and 2.00% and 3.50% for LIBOR loans. Borrowings under the credit facility shall initially bear interest at a rate per annum equal to LIBOR plus 2.50%. In anticipation of LIBOR's phase out, the Credit Agreement includes a well-documented transition mechanism for selecting a benchmark replacement rate for LIBOR. In addition to paying interest on outstanding principal under the credit facility, Services is required to pay a commitment fee to the lenders under the credit facility for unused commitments. The commitment fee rate ranges from 0.30% to 0.45% per annum depending on Services’ First Lien Net Leverage Ratio (as defined in the Credit Agreement). Debt Covenants The credit facility requires Services to comply with a quarterly maximum consolidated First Lien Net Leverage Ratio test and minimum Fixed Charge Coverage ratio as follows: • Fixed Charge Coverage Ratio - The Loan Parties shall not permit the Fixed Charge Coverage Ratio (as defined in the Credit Agreement) as of the last day of any four consecutive fiscal quarter period ending on the last day of a fiscal quarter to be less than 1.20:1.00. • First Lien Net Leverage Ratio – The Loan Parties will not permit the First Lien Net Leverage Ratio (as defined in the Credit Agreement) as of the last day of any four consecutive fiscal quarter period ending on the last day of a fiscal quarter to exceed 1.75:1.00 (subject to certain increases for permitted acquisitions). In addition, the Credit Agreement contains a number of covenants that, among other things and subject to certain exceptions, limit Services’ ability and the ability of its restricted subsidiaries, including the Company, to incur indebtedness or guarantee debt; incur liens; make investments, loans and acquisitions; merge, liquidate or dissolve; sell assets, including capital stock of subsidiaries; pay dividends on its capital stock or redeem, repurchase or retire its capital stock; amend, prepay, redeem or purchase subordinated debt; and engage in transactions with affiliates. The Credit Agreement contains certain customary representations and warranties, affirmative covenants and events of default (including, among others, an event of default upon a change of control). If an event of default occurs, the lenders under the credit facility are entitled to take various actions, including the acceleration of amounts due under the credit facility and all actions permitted to be taken by a secured creditor. As of March 31, 2022, management believed the Company was in compliance with these covenants. Contractual Maturities Contractual maturities of the Company's outstanding principal on debt obligations are as follows as of March 31, 2022: (in thousands) Maturities Remainder of 2022 $ 1,354 2023 836 2024 441 2025 255 2026 68 Thereafter 300,000 Total contractual maturities $ 302,954

Commitments and contingencies

Commitments and contingencies	3 Months Ended
	Mar. 31, 2022
Commitments and Contingencies Disclosure [Abstract]
Commitments and contingencies	Commitments and Contingencies In the ordinary course of business, the Company enters into agreements that provide financing for its machinery and equipment, facility and vehicle needs. The Company reviews these agreements for potential lease classification, and at inception, determines whether a lease is an operating or finance lease. Lease assets and liabilities, which generally represent the present value of future minimum lease payments over the term of the lease, are recognized as of the commencement date. Under ASC Topic 842, Leases , leases with an initial lease term of twelve months or less are classified as short-term leases and are not recognized in the condensed consolidated balance sheets unless they contain a purchase option that is reasonably certain to be exercised. Lease term, discount rate, variable lease costs and future minimum lease payment determinations require the use of judgment as these are based on the facts and circumstances related to each specific lease. Lease terms are generally based on their initial non-cancelable terms, unless there is a renewal option that is reasonably certain to be exercised. Various factors, including economic incentives, intent, past history and business need are considered to determine if a renewal option is reasonably certain to be exercised. The implicit rate in a lease agreement is used when it can be determined. Otherwise, the Company's incremental borrowing rate, which is based on information available as of the lease commencement date, including applicable lease terms and the current economic environment, is used to determine the value of the lease obligation. Finance Leases The Company has obligations, exclusive of associated interest, recognized under various finance leases for equipment totaling $63.5 million and $54.4 million at March 31, 2022 and December 31, 2021, respectively. Gross amounts recognized within property, plant and equipment in the condensed consolidated balance sheets under these finance lease agreements at March 31, 2022 and December 31, 2021, totaled $159.6 million and $143.6 million, less accumulated depreciation of $77.8 million and $71.4 million, respectively, for net balances of $81.8 million and $72.2 million, respectively. Depreciation expense for assets held under the finance leases is included in cost of revenue in the condensed consolidated statements of operations. The future minimum payments of finance lease obligations are as follows as of March 31, 2022: (in thousands) Remainder of 2022 $ 21,783 2023 16,817 2024 12,701 2025 10,316 2026 6,582 Thereafter 486 Future minimum lease payments 68,685 Less: Amount representing interest (5,193) Present value of minimum lease payments 63,492 Less: Current portion of finance lease obligations 24,778 Finance lease obligations, less current portion $ 38,714 Operating Leases In the ordinary course of business, the Company enters into non-cancelable operating leases for certain of its facilities, vehicles and equipment. The Company has obligations, exclusive of associated interest, totaling $37.5 million and $38.8 million at March 31, 2022 and December 31, 2021, respectively. Property under these operating lease agreements at March 31, 2022 and December 31, 2021, totaled $35.9 million and $37.3 million, respectively. The Company has long-term power-by-the-hour equipment rental agreements with a construction equipment manufacturer that have a guaranteed minimum monthly hour requirement. The minimum guaranteed amount based on the Company's current operations is $5.8 million per year. Total expense under these agreements are listed in the following table as variable lease costs. The future minimum payments under non-cancelable operating leases are as follows as of March 31, 2022: (in thousands) Remainder of 2022 $ 9,529 2023 10,457 2024 5,884 2025 3,030 2026 2,371 Thereafter 18,634 Future minimum lease payments 49,905 Less: Amount representing interest (12,455) Present value of minimum lease payments 37,450 Less: Current portion of operating lease obligations 10,401 Operating lease obligations, less current portion $ 27,049 Lease Information Three months ended March 31, 2022 March 31, 2021 Finance Lease cost: Amortization of right-of-use assets $ 6,522 $ 5,835 Interest on lease liabilities 737 817 Operating lease cost 3,376 3,394 Short-term lease cost 24,629 23,604 Variable lease cost 1,108 1,247 Sublease Income (33) (33) Total lease cost $ 36,339 $ 34,864 Other information: Cash paid for amounts included in the measurement of lease liabilities: Operating cash flows from finance leases $ 737 $ 817 Operating cash flows from operating leases $ 3,340 $ 3,245 Weighted-average remaining lease term - finance leases 3.40 years 2.41 years Weighted-average remaining lease term - operating leases 7.61 years 8.17 years Weighted-average discount rate - finance leases 5.17 % 6.18 % Weighted-average discount rate - operating leases 6.62 % 7.00 % Letters of Credit and Surety Bonds In the ordinary course of business, the Company may be required to post letters of credit and surety bonds to customers in support of performance under certain contracts. Such letters of credit are generally issued by a bank or similar financial institution. The letter of credit or surety bond commits the issuer to pay specified amounts to the holder of the letter of credit or surety bond under certain conditions. If the letter of credit or surety bond issuer were required to pay any amount to a holder, the Company would be required to reimburse the issuer, which, depending upon the circumstances, could result in a charge to earnings. As of March 31, 2022, and December 31, 2021, the Company was contingently liable under letters of credit issued under its credit facility, in the amount of $17.3 million and $31.1 million, respectively, related to projects and insurance. In addition, as of March 31, 2022 and December 31, 2021, the Company had outstanding surety bonds on projects with nominal amounts of $3.5 billion and $3.3 billion, respectively. The remaining approximate exposure related to these surety bonds amounted to $456.6 million and $353.5 million, respectively. Legal Proceedings The Company is a nominal defendant to a lawsuit, instituted in December 2019 in the Delaware Chancery Court by a purported stockholder of the Company, against the Company’s Board of Directors (the "Board"), Oaktree Capital Management ("Oaktree"), and Ares Management, LLC ("Ares"), from which Ares was subsequently dismissed. The complaint asserts a variety of claims arising out of the sale of Series B Preferred Stock and warrants to Ares and Oaktree in May 2019. The complaint alleges claims for breach of fiduciary duty directly on behalf of putative class of stockholders and derivatively on behalf of the Company, aiding and abetting breach of fiduciary duty both derivatively and directly, and unjust enrichment derivatively on behalf of the Company. The plaintiff is seeking rescission of the transaction, unspecified monetary damages, and fees. On July 28, 2021, the Company and the plaintiff stockholder entered into a memorandum of understanding to settle the lawsuit against all defendants, subject to approval by the Delaware Chancery Court, the terms of which do not require payment of any settlement funds to the plaintiff except that, as they are entitled to do under Delaware law, the plaintiffs are entitled to ask the Court to award them attorneys’ fees in connection with the settlement. The timing of the approval of the settlement, if any, by the Court is unknown at this time but is not expected to occur until later in 2022. The Company has placed its director and officer liability insurance carriers on notice of the lawsuit and the proposed settlement; pursuant to the coverage terms, the Company is subject to a $1.5 million deductible, which the Company has exhausted. Pursuant to agreements entered into in connection with the sale of Series B Preferred Stock, the Company is obligated to indemnify Oaktree and Ares for any legal fees and damages incurred by either of them in connection with this matter.

Earnings per share

Earnings per share	3 Months Ended
	Mar. 31, 2022
Earnings Per Share [Abstract]
Earnings per share	Earnings Per Share The Company calculates earnings (loss) per share ("EPS") in accordance with ASC Topic 260, Earnings per Share . Basic EPS is computed by dividing income (loss) available to common stockholders by the weighted average number of common shares of common stock outstanding during the period. Income (loss) available to common stockholders is computed by deducting the dividends accrued for the period on cumulative preferred stock from net income and net income allocated to participating securities. If there is a net loss, the amount of the loss is increased by those preferred dividends. Diluted EPS, where applicable, assumes the dilutive effect of (i) Series A cumulative convertible preferred stock, using the if-converted method, (ii) publicly traded warrants, (iii) Series B Preferred Stock - Warrants and (iv) the assumed exercise of in-the-money stock options and the assumed vesting of outstanding restricted stock units ("RSUs"), using the treasury stock method. Whether the Company has net income, or a net loss determines whether potential issuances of common stock are included in the diluted EPS computation or whether they would be anti-dilutive. As a result, if there is a net loss, diluted EPS is computed in the same manner as basic EPS is computed. Similarly, if the Company has net income but its preferred dividend adjustment made in computing income available to common stockholders results in a net loss available to common stockholders, diluted EPS would be computed the same as basic EPS. The calculations of basic and diluted EPS are as follows for the periods indicated: Three Months Ended March 31, ($ in thousands, except per share data) 2022 2021 Numerator: Net loss $ (27,071) $ (20,434) Less: Convertible Preferred Stock dividends — (656) Net loss available to common stockholders (27,071) (21,090) Denominator: Weighted average common shares outstanding - basic and diluted 48,129,331 23,057,731 Anti-dilutive: (1) Convertible Series A Preferred Stock (2) — 1,628,269 Series B Preferred Stock - Warrants (3) 94,077 7,684,057 Pre-Funded Warrants (4) 4,327,353 — Options (5) 480,124 426,824 RSUs (6) 1,744,028 1,958,045 Basic and Diluted EPS (0.56) (0.91) (1) As of March 31, 2022 and 2021, there were public warrants to purchase 2,981,010 and 8,480,000 shares of common stock at $11.50 per share that were not potentially dilutive, as the warrants’ exercise price was greater than the average market price of the common stock during the period. (2) On August 2, 2021, the Series A Preferred Stock was converted into common stock. (3) On August 2, 2021, the Company issued shares of common stock to ASOF Holdings I, L.P. ("ASOF") and Ares Special Situations Fund IV, L.P. (together, the "Ares Parties") for the exercise of all Series B Preferred Stock warrants held by the Ares Parties. As of March 31, 2022, there were 94,077 Series B Preferred Stock warrants that were considered anti-dilutive. (4) On August 2, 2021, the Company issued 7,747,589 Pre-Funded Warrants to ASOF that are considered participating because the holder is entitled to participate in any distributions similar to that of common shareholders. As of the three months ended March 31, 2022, there were 4,327,353 Pre-Funded Warrants. (5) As of March 31, 2022 and 2021, there were 480,124 and 426,824 vested and unvested options, respectively, that were considered anti-dilutive. (6) As of March 31, 2022 and 2021, there were 401,636 and 116,867 unvested RSUs, respectively. These awards were not considered dilutive as the respective performance targets were not achieved. Merger Warrants M III was formed as a special purpose acquisition company on August 4, 2015, and issued public and private warrants before the merger with the Company. As of March 31, 2022, the Company had 5,962,020 Merger Warrants outstanding, of which 295,000 are private warrants. For each two Merger Warrants, one share of common stock will be issuable at an exercise price of $11.50 per share until the expiration of the Merger Warrants on March 26, 2023. For further discussion about the valuation of the private warrants, see Note 5. Fair Value of Financial Instruments. On November 4, 2021, the Board authorized a repurchase program for the Company’s publicly traded warrants. This repurchase program allows the Company to purchase up to $25.0 million of warrants, and will end no later than the expiration of the warrants on March 26, 2023. The following information is related to purchases made for the three months ended March 31, 2022: Issuer Purchases of Equity Securities Period Total Number of Warrants Purchased Average Price Paid per Warrant Approximate January 1,009,802 $ 1.48 $ 11,457 February 505,597 1.79 10,536 March 177,230 2.06 10,167 Total 1,692,629 $ 1.64 As of March 31, 2022, the Company has repurchased 10,963,160 warrants. Series B Preferred Stock Anti-dilution Warrants The Company also had potential outstanding warrants related to the Series B Preferred Stock issuance. Additional warrants would be issued upon the exercise of any warrant with an exercise price of $11.50 or higher. See Note 5. Fair Value of Financial Instruments for further discussion. Stock Compensation Under ASC Topic 718, Compensation — Stock Compensation , stock-based compensation expense is measured at the date of grant, based on the calculated fair value of the stock-based award, and is recognized as an expense over the employee’s requisite service period (generally the vesting period of the award). The fair value of RSUs is based on the closing market price of the Company's common stock on the date of the grant. Stock compensation expense for RSUs is amortized using the straight-line method over the service period. For the three months ended March 31, 2022 and 2021, the Company recognized $1.6 million and $0.7 million in compensation expense, respectively.

Income taxes

Income taxes	3 Months Ended
	Mar. 31, 2022
Income Tax Disclosure [Abstract]
Income taxes	Income Taxes The Company’s statutory federal tax rate was 21.0% for the periods ended March 31, 2022 and 2021, respectively. State tax rates for the same period vary among states and range from approximately 0.8% to 12.0%. A small number of states do not impose an income tax. The effective tax rates for the three months ended March 31, 2022 and 2021 were 29.7% and 10.5%, respectively. The difference between the Company’s effective tax rate and the federal statutory rate primarily results from permanent differences related to the interest accrued for the Series B Preferred Stock and executive compensation, which are not deductible for federal and state income tax purposes. There were no changes in uncertain tax positions during the periods ended March 31, 2022 and 2021. The Company made use of the payroll tax deferral provision of the Coronavirus Aid, Relief, and Economic Security Act (the "CARES Act") to defer the 6.2% social security tax. The remaining amount required to be paid by December 31, 2022 is $7.0 million.

Segments (Notes)

Segments (Notes)	3 Months Ended
	Mar. 31, 2022
Segments [Abstract]
Segment Reporting Disclosure	Segments The Company operates its business as two reportable segments: the Renewables segment and the Specialty Civil segment. Each of the Company's reportable segments is comprised of similar business units that specialize in services unique to their respective markets. The classification of revenue and gross profit for segment reporting purposes can at times require judgment on the part of management. The Company's segments may perform services across industries or perform joint services for customers in multiple industries. To determine reportable segment gross profit, certain allocations, including allocations of shared and indirect costs, such as facility costs, equipment costs and indirect operating expenses, were made based on segment revenue. Separate measures of the Company’s financial results, including capital expenditures and cash flows by reportable segment, are not produced or utilized by management to evaluate segment performance. A substantial portion of the Company’s fixed assets are owned by and accounted for in its equipment department, including operating machinery, equipment and vehicles, as well as office equipment, buildings and leasehold improvements, and are used on an interchangeable basis across the Company's reportable segments. As such, for reporting purposes, total under/over absorption of equipment expenses consisting primarily of depreciation is allocated to the Company's two reportable segments based on segment revenue. The following are brief descriptions of the Company's reportable segments, each of which operates throughout the U.S.: Renewables Segment The Renewables segment specializes in a range of services for the power delivery, solar, wind and battery storage markets that includes design, procurement, construction, restoration, and maintenance. Specialty Civil Segment The Specialty Civil segment specializes in a range of services that include: • Heavy civil construction services such as road and bridge construction, specialty paving, sports field development, industrial maintenance, outsourced contract mining and heavy hauling. • Environmental remediation services such as site development, environmental site closure, and coal ash management. • Rail infrastructure services such as planning, design, procurement, construction and maintenance of major railway and intermodal facilities. Segment Revenue Revenue by segment was as follows for the periods indicated: Three Months Ended March 31, (in thousands) 2022 2021 Segment Revenue % of Total Revenue Revenue % of Total Revenue Renewables $ 243,614 67.7 % $ 180,374 65.3 % Specialty Civil 116,481 32.3 % 96,038 34.7 % Total revenue $ 360,095 100.0 % $ 276,412 100.0 % Segment Gross Profit Gross profit by segment was as follows for the periods indicated: Three Months Ended March 31, (in thousands) 2022 2021 Segment Gross Profit Gross Profit Margin Gross Profit Gross Profit Margin Renewables $ 1,301 0.5 % $ 12,180 6.8 % Specialty Civil 2,529 2.2 % 4,361 4.5 % Total gross profit $ 3,830 1.1 % $ 16,541 6.0 %

Investments, Equity Method and

Investments, Equity Method and Joint Ventures	3 Months Ended
	Mar. 31, 2022
Equity Method Investments and Joint Ventures [Abstract]
Equity Method Investments and Joint Ventures Disclosure	Joint Ventures On May 22, 2019, the Company formed a joint venture with another construction company for purposes of designing and constructing an expansion of a major railway. The joint venture does not meet the qualifications of a VIE, and the Company records its share of the joint venture's results and balances within the Specialty Civil segment using the proportionate consolidation method at 25% ownership. The joint venture's balances consisted of the following as of the dates indicated: (in thousands) March 31, 2022 December 31, 2021 Assets Cash $ 9,049 $ 8,850 Accounts receivable 367 874 Contract assets 2,919 2,796 Liabilities Accounts payable $ 2,161 $ 2,591 Contract liabilities 7,458 7,353 Equity $ 2,716 $ 2,576 Three Months Ended March 31, 2022 2021 Revenue $ 1,123 $ 4,501 Cost of revenue 983 4,501

Related party transactions

Related party transactions	3 Months Ended
	Mar. 31, 2022
Related Party Transactions [Abstract]
Related party transactions	Related Party Transactions On August 2, 2021, in connection with a series of equity transactions, the Company entered into a Stockholders’ Agreement with the Ares Parties. Pursuant to the Stockholders’ Agreement: • The Ares Parties are entitled to designate two members of the Company's Board under certain circumstances, as defined in the Stockholders' Agreement. • The Ares Parties agreed to certain restrictions regarding, among other matters, (i) transfers of common stock and (ii) taking certain actions regarding the Board's composition. • The Ares Parties agreed to cause all voting securities to be present at any annual or special meeting in which directors are to be elected, to vote such securities either as recommended by the Board, or in the same proportions as votes cast by other voting securities with respect to director nominees or other nominees and in favor of any director nominee of the Ares Parties, and not to vote in favor of a change of control transaction pursuant to which the Ares Parties would receive consideration that is different in amount or form from other stockholders unless approved by the Board. • The Ares Parties are afforded reasonable access to the Company's books and records for so long as the Ares Parties have a right to designate a director to the Board.

Business, Basis of Presentati_2

Business, Basis of Presentation and Significant Accounting Policies (Policies)	3 Months Ended
	Mar. 31, 2022
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Segment Reporting, Policy	The Company has two reportable segments: the Renewables ("Renewables") segment and the Heavy Civil and Industrial ("Specialty Civil") segment. See Note 10. Segments
Consolidation, Policy	Principles of Consolidation The accompanying unaudited condensed consolidated financial statements have been prepared in accordance with accounting principles generally accepted in the U.S. ("GAAP") for interim financial information and with the instructions for Quarterly Reports on Form 10-Q and Rule 10-01 of Regulation S-X. Pursuant to these rules and regulations, certain information and footnote disclosures normally included in the annual audited consolidated financial statements prepared in accordance with GAAP have been condensed or omitted. The unaudited condensed consolidated financial statements include the accounts of IEA and its wholly owned domestic and foreign subsidiaries. The Company occasionally forms joint ventures with unrelated third parties for the execution of single contracts or projects. The Company assesses its joint ventures to determine if they meet the qualifications of a variable interest entity ("VIE") in accordance with Accounting Standard Codification Topic 810, Consolidation ("ASC 810"). For construction joint ventures that are not VIEs or fully consolidated but for which the Company has significant influence, the Company accounts for its interest in the joint ventures using the proportionate consolidation method, see Note 11. Joint Ventures. In the opinion of management, these financial statements reflect all adjustments (consisting of normal recurring adjustments) that are necessary to present fairly the results of operations for the interim periods presented. The results of operations for the three months ended March 31, 2022 are not necessarily indicative of the results that may be expected for the year ending December 31, 2022. These financial statements should be read in conjunction with the Company’s audited consolidated financial statements for the year ended December 31, 2021 and notes thereto included in the Company’s 2021 Annual Report on Form 10-K filed with the SEC on March 7, 2022 (the "Annual Report").
Basis of Accounting, Policy	The accompanying unaudited condensed consolidated financial statements have been prepared in accordance with GAAP.
Use of Estimates, Policy	The preparation of the condensed consolidated financial statements in conformity with GAAP requires the use of estimates and assumptions that affect the amounts reported in the condensed consolidated financial statements and the accompanying notes. Key estimates include: the recognition of revenue and project profit or loss; fair value estimates related to warrant liabilities; valuations of goodwill and intangible assets; asset lives used in computing depreciation and amortization; accrued self-insured claims; other reserves and accruals; accounting for income taxes; and the estimated impact of contingencies and ongoing litigation. While management believes that its estimates are reasonable when considered in conjunction with the Company’s consolidated financial position and results of operations, actual results could differ materially from those estimates.The prior period classification of the warrant liability fair value adjustment for the Series B Preferred Stock - Anti-dilution warrants has been revised to conform to the current period presentation within the condensed consolidated statements of operations. This reclassification has no effect on net income or stockholders' equity.
Revenue	Revenue Recognition The Company derives revenue primarily from construction projects performed under contracts for specific projects requiring the construction and installation of an entire infrastructure system or specified units within an infrastructure system. Contracts contain multiple pricing options, such as fixed price, unit price, or time and materials. Generally, renewable energy projects are performed for private customers while Specialty Civil projects are performed for various governmental entities. Revenue derived from projects billed on a fixed-price basis totaled 74.0% and 78.7% of consolidated revenue from operations for the three months ended March 31, 2022 and 2021, respectively. Revenue derived from projects billed on a unit price basis totaled 24.9% and 17.5% of consolidated revenue from operations for the three months ended March 31, 2022 and 2021, respectively. Revenue and related costs for contracts billed on a time and materials basis are recognized as the services are rendered. Revenue derived from projects billed on a time and materials basis totaled 1.1% and 3.8% of consolidated revenue from operations for the three months ended March 31, 2022 and 2021, respectively. The prior period presentation of the components of the Company’s revenue by contract type has been revised to conform to the current presentation. Construction contract revenue is recognized over time using the cost-to-cost measure of progress for fixed price contracts. The cost-to-cost measure of progress best depicts the continuous transfer of control of goods or services to the customer. The contractual terms provide that the customer compensates the Company for services rendered. Contract costs include all direct materials, labor and subcontracted costs, as well as indirect costs related to contract performance, such as indirect labor, supplies, tools, repairs and the costs of capital equipment. The cost estimation and review process for recognizing revenue over time under the cost-to-cost method is based on the professional knowledge and experience of the Company’s project managers, engineers and financial professionals. Management reviews estimates of total contract transaction price and total project costs on an ongoing basis. Changes in job performance, job conditions and management’s assessment of expected variable consideration are factors that influence estimates of the total contract transaction price, total costs to complete those contracts and profit recognition. Changes in these factors could result in revisions to revenue and costs of revenue in the period in which the revisions are determined on a prospective basis, which could materially affect the Company’s results of operations for that period. Provisions for losses on uncompleted contracts are recorded in the period in which such losses are determined. Performance Obligations A performance obligation is a contractual promise to transfer a distinct good or service to the customer and is the unit of account under ASC Topic 606, Revenue from Contracts with Customers . The transaction price of a contract is allocated to distinct performance obligations and recognized as revenue when or as the performance obligations are satisfied. The Company’s contracts often require significant integrated services and, even when delivering multiple distinct services, are generally accounted for as a single performance obligation. Contract amendments and change orders are generally not distinct from the existing contract due to the significant integrated service provided in the context of the contract and are accounted for as a modification of the existing contract and performance obligation. With the exception of certain Specialty Civil service contracts, the majority of the Company’s performance obligations are generally completed within one year. When more than one contract is entered into with the same customer on or close to the same date, the Company evaluates whether those contracts should be combined and accounted for as a single contract, as well as whether those contracts should be accounted for as more than one performance obligation. This evaluation requires significant judgment and is based on the facts and circumstances of the various contracts, which could change the amount of revenue and profit recognition in a given period depending upon the outcome of the evaluation. Remaining performance obligations represent the amount of unearned transaction prices for contracts, including approved and unapproved change orders. As of March 31, 2022, the amount of the Company’s remaining performance obligations was $2.1 billion. The Company expects to recognize approximately 81.7% of its remaining performance obligations as revenue during the next twelve months. Revenue recognized from performance obligations satisfied in previous periods was $(12.9) million and $0.4 million for the three months ended March 31, 2022 and 2021, respectively. Variable Consideration Transaction pricing for the Company’s contracts may include variable consideration, such as unapproved change orders, claims, incentives and liquidated damages. Management estimates variable consideration for a performance obligation utilizing estimation methods that best predict the amount of consideration to which the Company will be entitled. Variable consideration is included in the estimated transaction price to the extent it is probable that a significant reversal of cumulative revenue recognized will not occur when the uncertainty associated with the variable consideration is resolved. Management’s estimates of variable consideration and determination of whether to include estimated amounts in the transaction price are based on legal opinions, past practices with the customer, specific discussions, correspondence or preliminary negotiations with the customer and all other relevant information that is reasonably available. The effect of a change in variable consideration on the transaction price of a performance obligation is typically recognized as an adjustment to revenue on a cumulative catch-up basis. To the extent unapproved change orders, claims and liquidated damages reflected in the transaction price are not resolved in the Company’s favor, or to the extent incentives reflected in the transaction price are not earned, there could be reductions in, or reversals of, previously recognized revenue. As of March 31, 2022 and December 31, 2021, the Company included approximately $93.5 million and $94.5 million, respectively, of estimated transaction price adjustments that arise from unapproved change orders in process of being resolved in the normal course of business and/or from transaction price disputes in contracts that are subject to resolution through litigation, arbitration and other legal proceedings. These transaction price adjustments are included within Contract Assets or Contract Liabilities in the Company’s condensed consolidated balance sheets as appropriate. The Company actively engages with its customers to complete the final approval process on unapproved change orders and generally expects these processes to be completed within one year, while sometimes disputes subject to formal legal proceedings can take longer than a year to resolve. Amounts ultimately realized upon resolution with customers of these transaction price adjustments could be higher or lower than such estimated amounts. Disaggregation of Revenue The following tables disaggregate revenue by customers and services performed, which the Company believes best depicts the nature, amount, timing and uncertainty of its revenue: (in thousands) Three Months Ended March 31, 2022 March 31, 2021 Renewables Segment Wind $ 117,932 $ 146,858 Solar 125,682 33,516 $ 243,614 $ 180,374 Specialty Civil Segment Heavy civil $ 54,246 $ 48,871 Rail 14,681 26,868 Environmental 47,554 20,299 $ 116,481 $ 96,038
Interest in Unincorporated Joint Ventures or Partnerships, Policy	Construction Joint Ventures Certain contracts are executed through joint ventures. The arrangements are often formed for the execution of single contracts or projects and allow the Company to share risks and secure specialty skills required for project execution. In accordance with ASC 810, the Company assesses its joint ventures at inception to determine if they meet the qualifications of a VIE. The Company considers a joint venture a VIE if either (a) the total equity investment is not sufficient to permit the entity to finance its activities without additional subordinated financial support, (b) characteristics of a controlling financial interest are missing (either the ability to make decisions through voting or other rights, the obligation to absorb the expected losses of the entity or the right to receive the expected residual returns of the entity), or (c) the voting rights of the equity holders are not proportional to their obligations to absorb the expected losses of the entity and/or their rights to receive the expected residual returns of the entity and substantially all of the entity’s activities either involve or are conducted on behalf of an investor that has disproportionately few voting rights. Upon the occurrence of certain events outlined in ASC 810, the Company reassesses its initial determination of whether the joint venture is a VIE. The Company also evaluates whether it is the primary beneficiary of each VIE and consolidates the VIE if the Company has both (a) the power to direct the economically significant activities of the entity and (b) the obligation to absorb losses of, or the right to receive benefits from, the entity that could potentially be significant to the VIE. The Company considers the contractual agreements that define the ownership structure, distribution of profits and losses, risks, responsibilities, indebtedness, voting rights and board representation of the respective parties in determining whether it qualifies as the primary beneficiary. The Company also considers all parties that have direct or implicit variable interests when determining whether it is the primary beneficiary. When the Company is determined to be the primary beneficiary, the VIE is consolidated. In accordance with ASC 810, management’s assessment of whether the Company is the primary beneficiary of a VIE is performed continuously. Construction joint ventures that do not involve a VIE, or for which the Company is not the primary beneficiary, are evaluated for consolidation under the voting interest model that considers whether the Company owns or controls more than 50% of the voting interest in the joint venture. For construction joint ventures that are not consolidated but for which the Company has significant influence, the Company accounts for its interest in the joint ventures using the proportionate consolidation method, whereby the Company’s proportionate share of the joint ventures’ assets, liabilities, revenue and cost of operations are included in the appropriate classifications in the Company’s condensed consolidated financial statements. See Note 11. Joint Ventures for additional discussion regarding joint ventures.
New Accounting Pronouncements, Policy	Recently Issued Accounting Standards Not Yet Adopted Management has evaluated other recently issued accounting pronouncements and does not believe that they will have a significant impact on the condensed consolidated financial statements or related disclosures.

Business, Basis of Presentati_3

Business, Basis of Presentation and Significant Accounting Policies (Tables)	3 Months Ended
	Mar. 31, 2022
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Disaggregation of Revenue	The following tables disaggregate revenue by customers and services performed, which the Company believes best depicts the nature, amount, timing and uncertainty of its revenue: (in thousands) Three Months Ended March 31, 2022 March 31, 2021 Renewables Segment Wind $ 117,932 $ 146,858 Solar 125,682 33,516 $ 243,614 $ 180,374 Specialty Civil Segment Heavy civil $ 54,246 $ 48,871 Rail 14,681 26,868 Environmental 47,554 20,299 $ 116,481 $ 96,038
Schedule of revenue and accounts receivable concentrations, net of allowances	Concentrations Each of the Company's renewable projects is generally considered an individual customer because, typically, each project's developer forms its own project legal entity. The following table provides the approximate revenue and accounts receivable concentrations, net of allowances, for Renewables and Specialty Civil customers that accounted for 10% of the Company's revenue or accounts receivable for the periods indicated: Revenue % Three Months Ended Accounts Receivable % March 31, 2022 March 31, 2021 March 31, 2022 December 31, 2021 Company A (Renewables Segment) 10.0 % * * * * Amount was not above 10% threshold

Contract Assets and Liabiliti_2

Contract Assets and Liabilities (Tables)	3 Months Ended
	Mar. 31, 2022
Contractors [Abstract]
Contract Assets and Contract Liabilities	Contract assets consisted of the following as of the dates indicated: (in thousands) March 31, 2022 December 31, 2021 Costs and estimated earnings in excess of billings on uncompleted contracts $ 140,805 $ 120,900 Retainage receivable 79,314 93,398 $ 220,119 $ 214,298 Contract assets as of March 31, 2022 include approximately $33.5 million for transaction price disputes in which the Company is pursuing settlement through dispute resolution and arbitration. The Company believes that these disputed amounts are collectible and recoverable under the applicable contracts. See Note 1. Business, Basis of Presentation and Significant Accounting Policies for further discussion of revenue recognized on variable consideration. Contract liabilities consisted of the following as of the dates indicated: (in thousands) March 31, 2022 December 31, 2021 Billings in excess of costs and estimated earnings on uncompleted contracts $ 147,931 $ 125,658 Loss on contracts in progress 521 470 $ 148,452 $ 126,128
Accounts Receivable, Allowance for Credit Loss	Activity in the allowance for credit losses for the periods indicated was as follows: Three Months Ended March 31, (in thousands) 2022 2021 Allowance for credit losses at beginning of period $ — $ — Plus: provision for (reduction in) allowance — — Less: write-offs, net of recoveries — — Allowance for credit losses at period end $ — $ — Accounts Receivable at March 31, 2022, includes $18.3 million for transaction price disputes discussed as a part of contract assets. The Company is pursuing settlement through arbitration and believes that this amount is fully recoverable but cannot guarantee the timing of the collection due to the pending arbitration.

Property, plant and equipment_2

Property, plant and equipment, net (Tables)	3 Months Ended
	Mar. 31, 2022
Property, Plant and Equipment [Abstract]
Schedule of property plant and equipment	Property, plant and equipment consisted of the following as of the dates indicated: (in thousands) March 31, 2022 December 31, 2021 Buildings and leasehold improvements $ 6,540 $ 6,884 Land 17,600 17,600 Construction equipment 245,627 227,807 Office equipment, furniture and fixtures 2,874 3,687 Vehicles 8,448 8,289 Total property, plant and equipment 281,089 264,267 Accumulated depreciation (132,603) (125,662) Property, plant and equipment, net $ 148,486 $ 138,605 Depreciation expense of property, plant and equipment was $10.7 million and $9.2 million for the three months ended March 31, 2022 and 2021, respectively.

Goodwill and Intangible Asset_2

Goodwill and Intangible Assets, net (Tables)	3 Months Ended
	Mar. 31, 2022
Goodwill and Intangible Assets Disclosure [Abstract]
Schedule of Goodwill	The following table provides the changes in the carrying amount of goodwill, by reporting unit: (in thousands) Renewables Specialty Civil Total January 1, 2021 $ 3,020 $ 34,353 $ 37,373 Adjustments — — — December 31, 2021 $ 3,020 $ 34,353 $ 37,373 Adjustments — — — March 31, 2022 $ 3,020 $ 34,353 $ 37,373 The goodwill recorded in the Company's Specialty Civil reporting unit is deductible for income tax purposes over a 15-year period, with the exception of $2.9 million that is not deductible.
Schedule of Finite-Lived Intangible Assets	Intangible assets consisted of the following as of the dates indicated: March 31, 2022 December 31, 2021 ($ in thousands) Gross Carrying Amount Accumulated Amortization Net Carrying Amount Weighted Average Remaining Life Gross Carrying Amount Accumulated Amortization Net Carrying Amount Weighted Average Remaining Life Customer relationships $ 26,500 $ (13,213) $ 13,287 3.75 years $ 26,500 $ (12,267) $ 14,233 4 years Trade name 13,400 (9,335) 4,065 1.75 years 13,400 (8,664) 4,736 2 years $ 39,900 $ (22,548) $ 17,352 $ 39,900 $ (20,931) $ 18,969 Amortization expense associated with intangible assets for the three months ended March 31, 2022 and 2021, totaled $1.6 million and $1.6 million, respectively.
Schedule of Finite-Lived Intangible Assets, Future Amortization Expense	The following table provides the annual intangible amortization expense currently expected to be recognized for the years 2022 through 2025: (in thousands) Remainder of 2022 2023 2024 2025 Amortization expense $ 4,849 $ 5,841 $ 3,785 $ 2,877

Fair value of financial instr_2

Fair value of financial instruments (Tables)	3 Months Ended
	Mar. 31, 2022
Fair Value Disclosures [Abstract]
Schedule of fair value of liabilities measured on recurring basis	The following table sets forth information regarding the Company's liabilities measured at fair value on a recurring basis: March 31, 2022 December 31, 2021 (in thousands) Level 1 Level 2 Level 3 Total Level 1 Level 2 Level 3 Total Liabilities Private warrants $ — $ 626 $ — $ 626 $ — $ 410 $ — $ 410 Series B Preferred Stock - Anti-dilution warrants — — 6,769 6,769 — — 5,557 5,557 Total liabilities $ — $ 626 $ 6,769 $ 7,395 $ — $ 410 $ 5,557 $ 5,967
Schedule of reconciliation of fair value unobservable liabilities measured on recurring basis	The following is a reconciliation of the beginning and ending balances of recurring fair value measurements using Level 3 inputs: (in thousands) Series B Preferred Stock - Anti-dilution warrants Beginning Balance, December 31, 2021 $ 5,557 Fair value adjustment - loss recognized in other income 1,212 Ending Balance, March 31, 2022 $ 6,769
Fair Value Measurement Inputs and Valuation Techniques	Significant unobservable inputs used in the fair value calculation as of the period indicated were as follows: March 31, 2022 Stock price $ 11.85 Conversion stock price $ 11.50 Time before Merger Warrant expiration 0.99 Stock volatility 45.66 % Risk-free interest rate 1.60 %

Debt (Tables)

Debt (Tables)	3 Months Ended
	Mar. 31, 2022
Debt Disclosure [Abstract]
Schedule of debt	Debt consisted of the following obligations as of the dates indicated: (in thousands) March 31, 2022 December 31, 2021 Senior unsecured notes 300,000 300,000 Commercial equipment notes 2,954 3,557 Total principal due for long-term debt 302,954 303,557 Unamortized debt discount and issuance costs (10,490) (10,867) Less: Current portion of long-term debt (1,573) (1,960) Long-term debt, less current portion $ 290,891 $ 290,730
Contractual maturities of debt and capital lease obligations	Contractual Maturities Contractual maturities of the Company's outstanding principal on debt obligations are as follows as of March 31, 2022: (in thousands) Maturities Remainder of 2022 $ 1,354 2023 836 2024 441 2025 255 2026 68 Thereafter 300,000 Total contractual maturities $ 302,954

Commitments and contingencies (

Commitments and contingencies (Tables)	3 Months Ended
	Mar. 31, 2022
Commitments and Contingencies Disclosure [Abstract]
Finance Lease, Liability, Fiscal Year Maturity	The future minimum payments of finance lease obligations are as follows as of March 31, 2022: (in thousands) Remainder of 2022 $ 21,783 2023 16,817 2024 12,701 2025 10,316 2026 6,582 Thereafter 486 Future minimum lease payments 68,685 Less: Amount representing interest (5,193) Present value of minimum lease payments 63,492 Less: Current portion of finance lease obligations 24,778 Finance lease obligations, less current portion $ 38,714
Lessee, Operating Lease, Liability, Maturity	The future minimum payments under non-cancelable operating leases are as follows as of March 31, 2022: (in thousands) Remainder of 2022 $ 9,529 2023 10,457 2024 5,884 2025 3,030 2026 2,371 Thereafter 18,634 Future minimum lease payments 49,905 Less: Amount representing interest (12,455) Present value of minimum lease payments 37,450 Less: Current portion of operating lease obligations 10,401 Operating lease obligations, less current portion $ 27,049
Schedule of Additional Lease Information	Lease Information Three months ended March 31, 2022 March 31, 2021 Finance Lease cost: Amortization of right-of-use assets $ 6,522 $ 5,835 Interest on lease liabilities 737 817 Operating lease cost 3,376 3,394 Short-term lease cost 24,629 23,604 Variable lease cost 1,108 1,247 Sublease Income (33) (33) Total lease cost $ 36,339 $ 34,864 Other information: Cash paid for amounts included in the measurement of lease liabilities: Operating cash flows from finance leases $ 737 $ 817 Operating cash flows from operating leases $ 3,340 $ 3,245 Weighted-average remaining lease term - finance leases 3.40 years 2.41 years Weighted-average remaining lease term - operating leases 7.61 years 8.17 years Weighted-average discount rate - finance leases 5.17 % 6.18 % Weighted-average discount rate - operating leases 6.62 % 7.00 %

Earnings per share (Tables)

Earnings per share (Tables)	3 Months Ended
	Mar. 31, 2022
Earnings Per Share [Abstract]
Schedule of basic and diluted EPS	The calculations of basic and diluted EPS are as follows for the periods indicated: Three Months Ended March 31, ($ in thousands, except per share data) 2022 2021 Numerator: Net loss $ (27,071) $ (20,434) Less: Convertible Preferred Stock dividends — (656) Net loss available to common stockholders (27,071) (21,090) Denominator: Weighted average common shares outstanding - basic and diluted 48,129,331 23,057,731 Anti-dilutive: (1) Convertible Series A Preferred Stock (2) — 1,628,269 Series B Preferred Stock - Warrants (3) 94,077 7,684,057 Pre-Funded Warrants (4) 4,327,353 — Options (5) 480,124 426,824 RSUs (6) 1,744,028 1,958,045 Basic and Diluted EPS (0.56) (0.91) (1) As of March 31, 2022 and 2021, there were public warrants to purchase 2,981,010 and 8,480,000 shares of common stock at $11.50 per share that were not potentially dilutive, as the warrants’ exercise price was greater than the average market price of the common stock during the period. (2) On August 2, 2021, the Series A Preferred Stock was converted into common stock. (3) On August 2, 2021, the Company issued shares of common stock to ASOF Holdings I, L.P. ("ASOF") and Ares Special Situations Fund IV, L.P. (together, the "Ares Parties") for the exercise of all Series B Preferred Stock warrants held by the Ares Parties. As of March 31, 2022, there were 94,077 Series B Preferred Stock warrants that were considered anti-dilutive. (4) On August 2, 2021, the Company issued 7,747,589 Pre-Funded Warrants to ASOF that are considered participating because the holder is entitled to participate in any distributions similar to that of common shareholders. As of the three months ended March 31, 2022, there were 4,327,353 Pre-Funded Warrants. (5) As of March 31, 2022 and 2021, there were 480,124 and 426,824 vested and unvested options, respectively, that were considered anti-dilutive.
Accelerated Share Repurchases [Table Text Block]	The following information is related to purchases made for the three months ended March 31, 2022: Issuer Purchases of Equity Securities Period Total Number of Warrants Purchased Average Price Paid per Warrant Approximate January 1,009,802 $ 1.48 $ 11,457 February 505,597 1.79 10,536 March 177,230 2.06 10,167 Total 1,692,629 $ 1.64 As of March 31, 2022, the Company has repurchased 10,963,160 warrants.

Segments (Tables)

Segments (Tables)	3 Months Ended
	Mar. 31, 2022
Segments [Abstract]
Reconciliation of Revenue from Segments to Consolidated	Segment Revenue Revenue by segment was as follows for the periods indicated: Three Months Ended March 31, (in thousands) 2022 2021 Segment Revenue % of Total Revenue Revenue % of Total Revenue Renewables $ 243,614 67.7 % $ 180,374 65.3 % Specialty Civil 116,481 32.3 % 96,038 34.7 % Total revenue $ 360,095 100.0 % $ 276,412 100.0 %
Reconciliation of Other Significant Reconciling Items from Segments to Consolidated	Segment Gross Profit Gross profit by segment was as follows for the periods indicated: Three Months Ended March 31, (in thousands) 2022 2021 Segment Gross Profit Gross Profit Margin Gross Profit Gross Profit Margin Renewables $ 1,301 0.5 % $ 12,180 6.8 % Specialty Civil 2,529 2.2 % 4,361 4.5 % Total gross profit $ 3,830 1.1 % $ 16,541 6.0 %

Investments, Equity Method an_2

Investments, Equity Method and Joint Ventures (Tables)	3 Months Ended
	Mar. 31, 2022
Equity Method Investments and Joint Ventures [Abstract]
Schedule of Operating Activities of Joint Ventures	The joint venture's balances consisted of the following as of the dates indicated: (in thousands) March 31, 2022 December 31, 2021 Assets Cash $ 9,049 $ 8,850 Accounts receivable 367 874 Contract assets 2,919 2,796 Liabilities Accounts payable $ 2,161 $ 2,591 Contract liabilities 7,458 7,353 Equity $ 2,716 $ 2,576 Three Months Ended March 31, 2022 2021 Revenue $ 1,123 $ 4,501 Cost of revenue 983 4,501

Business, Basis of Presentati_4

Business, Basis of Presentation and Significant Accounting Policies Schedule of concentrations for revenue and accounts receivable (Details) - Product Concentration Risk - Revenue Benchmark	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Fixed-price Contract
Concentration Risk [Line Items]
Concentration Risk, Percentage	74.00%	78.70%
Unit Price Contract
Concentration Risk [Line Items]
Concentration Risk, Percentage	24.90%	17.50%
Time-and-materials Contract
Concentration Risk [Line Items]
Concentration Risk, Percentage	1.10%	3.80%
Company A (Renewables Segment)
Concentration Risk [Line Items]
Concentration Risk, Percentage	10.00%

Business, Basis of Presentati_5

Business, Basis of Presentation and Significant Accounting Policies Revenue 606 (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Dec. 31, 2021
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, Remaining Performance Obligation, Amount	$ 2,100,000
Revenue, Remaining Performance Obligation, Percentage	81.70%
Contract with Customer, Performance Obligation Satisfied in Previous Period	$ (12,900)	$ 400
Contract with Customer, Revenue Recognized, Related to Unapproved Change Orders and Claims	$ 93,500		$ 94,500
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-04-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period	12 months

Business, Basis of Presentati_6

Business, Basis of Presentation and Significant Accounting Policies Disaggregation of Revenue (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2022USD ($)	Mar. 31, 2021USD ($)
Disaggregation of Revenue [Line Items]
Number of Reportable Segments	2
Revenue	$ 360,095	$ 276,412
Wind Revenue
Disaggregation of Revenue [Line Items]
Revenue	117,932	146,858
Solar Revenue
Disaggregation of Revenue [Line Items]
Revenue	125,682	33,516
Heavy Civil Revenue
Disaggregation of Revenue [Line Items]
Revenue	54,246	48,871
Rail Construction Revenue
Disaggregation of Revenue [Line Items]
Revenue	14,681	26,868
Environmental Revenue
Disaggregation of Revenue [Line Items]
Revenue	47,554	20,299
Renewables Segment
Disaggregation of Revenue [Line Items]
Revenue	243,614	180,374
Specialty Civil Segment
Disaggregation of Revenue [Line Items]
Revenue	$ 116,481	$ 96,038

Contract Assets and Liabiliti_3

Contract Assets and Liabilities Contract Assets and Contract Liabilities (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Dec. 31, 2021
Contractors [Abstract]
Unbilled Contracts Receivable	$ 140,805		$ 120,900
Construction Contractor, Receivable, Retainage	79,314		93,398
Contract assets	220,119		214,298
Deferred Revenue	147,931		125,658
Provision for Loss on Contracts	521		470
Contract Liabilities	148,452		$ 126,128
Contract Assets - Disputed Amounts	33,500
Contract with Customer, Liability, Revenue Recognized	$ 89,000	$ 87,800

Contract Assets and Liabiliti_4

Contract Assets and Liabilities Activity in allowance for doubtful accounts (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Receivables [Abstract]
Accounts Receivable, Allowance for Credit Loss, Beginning of Period	$ 0	$ 0
Accounts Receivable, Allowance for Credit Loss, Writeoff	0	0
Accounts Receivable, Credit Loss Expense (Reversal)	0	0
Accounts Receivable, Allowance for Credit Loss, End of Period	0	$ 0
Accounts Receivable Disputed Amount	$ 18,300

Property, plant and equipment_3

Property, plant and equipment, net (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Dec. 31, 2021
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 281,089		$ 264,267
Accumulated depreciation	(132,603)		(125,662)
Property, plant and equipment, net	148,486		138,605
Depreciation expense	10,700	$ 9,200
Buildings and leasehold improvements
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	6,540		6,884
Land
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	17,600		17,600
Construction equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	245,627		227,807
Office equipment, furniture and fixtures
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	2,874		3,687
Vehicles
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 8,448		$ 8,289

Goodwill and Intangible Asset_3

Goodwill and Intangible Assets, net (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2022	Dec. 31, 2021
Goodwill [Roll Forward]
Goodwill, Beginning Balance	$ 37,373	$ 37,373
Goodwill, Period Increase (Decrease)	0	0
Goodwill, Ending Balance	37,373	37,373
Goodwill, Nondeductible Portion, Amount	2,900
Renewables Segment
Goodwill [Roll Forward]
Goodwill, Beginning Balance	3,020	3,020
Goodwill, Period Increase (Decrease)	0	0
Goodwill, Ending Balance	3,020	3,020
Specialty Civil Segment
Goodwill [Roll Forward]
Goodwill, Beginning Balance	34,353	34,353
Goodwill, Period Increase (Decrease)	0	0
Goodwill, Ending Balance	$ 34,353	$ 34,353

Goodwill and Intangible Asset_4

Goodwill and Intangible Assets, net Schedule of intangible assets (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Dec. 31, 2021
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 39,900		$ 39,900
Accumulated Amortization	(22,548)		(20,931)
Net Book Value	17,352		18,969
Amortization of Intangible Assets	1,600	$ 1,600
Customer relationships
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	26,500		26,500
Accumulated Amortization	(13,213)		(12,267)
Net Book Value	$ 13,287		$ 14,233
Weighted Average Useful Life	3 years 9 months		4 years
Trade name
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 13,400		$ 13,400
Accumulated Amortization	(9,335)		(8,664)
Net Book Value	$ 4,065		$ 4,736
Weighted Average Useful Life	1 year 9 months		2 years

Goodwill and Intangible Asset_5

Goodwill and Intangible Assets, net Schedule of annual expected amortization expense (Details) $ in Thousands	Mar. 31, 2022USD ($)
Finite-Lived Intangible Assets [Line Items]
Remainder of 2022	$ 4,849
2023	5,841
2024	3,785
2025	$ 2,877

Fair value of financial instr_3

Fair value of financial instruments - Fair Value Liabilities Measured on Recurring Basis (Details) - Recurring - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Liabilities at fair value	$ 7,395	$ 5,967
Merger Warrants - Private
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Liabilities at fair value	626	410
Series B Preferred Stock - Anti-Dilution Warrants [Domain]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Liabilities at fair value	6,769	5,557
Quoted Prices in Active Markets for Identical Assets (Level 1)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Liabilities at fair value	0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Merger Warrants - Private
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Liabilities at fair value	0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Series B Preferred Stock - Anti-Dilution Warrants [Domain]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Liabilities at fair value	0	0
Significant Other Observable Inputs (Level 2)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Liabilities at fair value	626	410
Significant Other Observable Inputs (Level 2) | Merger Warrants - Private
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Liabilities at fair value	626	410
Significant Other Observable Inputs (Level 2) | Series B Preferred Stock - Anti-Dilution Warrants [Domain]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Liabilities at fair value	0	0
Significant Unobservable Inputs (Level 3)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Liabilities at fair value	6,769	5,557
Significant Unobservable Inputs (Level 3) | Merger Warrants - Private
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Liabilities at fair value	0	0
Significant Unobservable Inputs (Level 3) | Series B Preferred Stock - Anti-Dilution Warrants [Domain]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Liabilities at fair value	$ 6,769	$ 5,557

Fair value of financial instr_4

Fair value of financial instruments - Reconciliation of Level 3 Inputs (Details) - Series B Preferred Stock - Anti-Dilution Warrants [Domain] $ in Thousands	3 Months Ended
	Mar. 31, 2022USD ($)
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance, December 31, 2021	$ 5,557
Fair value adjustment - loss recognized in other income	1,212
Ending Balance, March 31, 2022	$ 6,769

Fair value of financial instr_5

Fair value of financial instruments - Fair Value (Details) - USD ($)	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	May 20, 2019
Merger Warrants
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Class of Warrant or Right, Exercise Price of Warrants or Rights	$ 11.50
Class of Warrant or Right, Outstanding	5,962,020
Antidilutive securities excluded from computation of earnings per share, amount	2,981,010	8,480,000
Merger Warrants - Private
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Merger Warrants - Private	295,000
Anti-Dilution Shares
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Anti-dilution Warrants	900,000
Other Liabilities, Fair Value Disclosure	$ 6,800,000
Embedded Derivative, Fair Value of Embedded Derivative Liability	$ 7.46
Series B-3 Preferred Stock Closing Warrants
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Exercise price of warrants			$ 0.0001

Fair value of financial instr_6

Fair value of financial instruments - Unobservable Inputs (Details)	3 Months Ended
	Mar. 31, 2022timePeriod$ / shares
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Share price (in dollars per share)	$ 11.85
Warrants and Rights Outstanding, Measurement Input | timePeriod	0.99
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate	45.66%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate	1.60%
Merger Warrants
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Class of Warrant or Right, Exercise Price of Warrants or Rights	$ 11.50

Debt - Long-Term Debt (Details)

Debt - Long-Term Debt (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Debt Instrument [Line Items]
Total principal due for long-term debt	$ 302,954	$ 303,557
Debt Issuance Costs, Net	(10,490)	(10,867)
Long-term Debt, Current Maturities	(1,573)	(1,960)
Long-term debt, less current portion	290,891	290,730
Senior unsecured notes
Debt Instrument [Line Items]
Total principal due for long-term debt	300,000	300,000
Commercial equipment notes
Debt Instrument [Line Items]
Total principal due for long-term debt	$ 2,954	$ 3,557

Debt - Narrative (Details)

Debt - Narrative (Details) - Senior unsecured notes $ in Thousands	Aug. 17, 2021USD ($)
Debt Instrument [Line Items]
Debt Instrument, Face Amount	$ 300,000
Debt, Weighted Average Interest Rate	6.625%

Revolving Credit Facility (Deta

Revolving Credit Facility (Details) - Revolving Credit Facility $ in Thousands	Aug. 17, 2021USD ($)
Line of Credit Facility [Line Items]
Line of Credit Facility, Current Borrowing Capacity	$ 150,000
Additional borrowing under revolving credit facility	$ 50,000
Fixed Charge Coverage Ratio	1.20
Debt Instrument, Covenant Terms, Maximum First Lien Net Leverage Ratio	1.75
Minimum
Line of Credit Facility [Line Items]
Line of Credit Facility, Commitment Fee Percentage	0.30%
Maximum
Line of Credit Facility [Line Items]
Line of Credit Facility, Commitment Fee Percentage	0.45%
Index Rate Loans
Line of Credit Facility [Line Items]
Loans Receivable, Basis Spread on Variable Rate	0.50%
Minimum interest rate adjustment for revolver	1.00%
Maximum interest rate percentage increase for revolver	2.50%
London Interbank Offered Rate (LIBOR) [Member]
Line of Credit Facility [Line Items]
Loans Receivable, Basis Spread on Variable Rate	2.50%
Minimum interest rate adjustment for revolver	2.00%
Maximum interest rate percentage increase for revolver	3.50%

Debt - Long Term Debt Obligatio

Debt - Long Term Debt Obligations (Details) $ in Thousands	Mar. 31, 2022USD ($)
Debt Disclosure [Abstract]
Remainder of 2022	$ 1,354
2023	836
2024	441
2025	255
2026	68
Thereafter	300,000
Contractual Obligation	$ 302,954

Commitments and contingencies -

Commitments and contingencies - Lease Narrative (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Commitments and Contingencies Disclosure [Abstract]
Finance Lease, Liability	$ 63,492	$ 54,400
Finance Lease, Right-of-Use Asset, before Accumulated Amortization	159,600	143,600
Property, Plant, and Equipment and Finance Lease Right-of-Use Asset, Accumulated Depreciation and Amortization	(77,800)	(71,400)
Finance Lease, Right-of-Use Asset, after Accumulated Amortization	81,800	72,200
Operating Lease, Liability	37,450	38,800
Operating lease assets	35,904	$ 37,292
Other Commitments, Future Minimum Payments, Remainder of Fiscal Year	$ 5,800

Commitments and contingencies F

Commitments and contingencies Future minimum payments of finance leases (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Commitments and Contingencies Disclosures [Abstract]
Remainder of 2022	$ 21,783
2023	16,817
2024	12,701
2025	10,316
2026	6,582
Thereafter	486
Finance minimum lease payments	68,685
Less: Amount representing interest	(5,193)
Present Value of Minimum Lease Payments	63,492	$ 54,400
Current portion of finance lease obligations	24,778	24,345
Finance lease obligations, less current portion	$ 38,714	$ 30,096

Commitments and contingencies_2

Commitments and contingencies Future mimum payments of operating leases (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Commitments and Contingencies Disclosures [Abstract]
Remainder of 2022	$ 9,529
2023	10,457
2024	5,884
2025	3,030
2026	2,371
Thereafter	18,634
Lessee, Operating Lease, Liability, Payments, Due	49,905
Operating Leases, Future Minimum Payments, Interest Included in Payments	(12,455)
Operating Lease, Liability	37,450	$ 38,800
Current portion of operating lease obligations	10,401	10,254
Operating lease obligations, less current portion	$ 27,049	$ 28,540

Commitments and contingencies S

Commitments and contingencies Schedule of Additional Lease Information (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Additional Lease Information [Abstract]
Finance Lease, Right-of-Use Asset, Amortization	$ 6,522	$ 5,835
Finance Lease, Interest Expense	737	817
Operating Lease, Cost	3,376	3,394
Short-term Lease, Cost	24,629	23,604
Variable Lease, Cost	1,108	1,247
Sublease Income	(33)	(33)
Lease, Cost	36,339	34,864
Operating Cashflow Finance Leases	737	817
Operating cashflow from operating leases	$ 3,340	$ 3,245
Finance Lease, Weighted Average Remaining Lease Term	3 years 4 months 24 days	2 years 4 months 28 days
Operating Lease, Weighted Average Remaining Lease Term	7 years 7 months 9 days	8 years 2 months 1 day
Finance Lease, Weighted Average Discount Rate, Percent	5.17%	6.18%
Operating Lease, Weighted Average Discount Rate, Percent	6.62%	7.00%

Other Commitments and contingen

Other Commitments and contingencies (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Dec. 31, 2021
Other Commitments [Line Items]
Letters of Credit Outstanding, Amount	$ 17,300	$ 31,100
Special Assessment Bond	3,500,000	3,300,000
Special Assessment Bond, Current	456,600	$ 353,500
Litigation Settlement, Expense	$ 1,500

Earnings per share - Basic and

Earnings per share - Basic and Diluted EPS (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Aug. 02, 2021
Numerator:
Net loss	$ (27,071)	$ (20,434)
Preferred Stock Dividends, Income Statement Impact	0	(656)
Net loss available to common stockholders	$ (27,071)	$ (21,090)
Denominator:
Weighted average shares - basic and diluted	48,129,331	23,057,731
Earnings Per Share, Basic	$ (0.56)	$ (0.91)
Earnings Per Share, Diluted	$ (0.56)	$ (0.91)
Redeemable Preferred Stock
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share, amount	0	1,628,269
Warrants for Common Stock
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share, amount	94,077	7,684,057
Prefunded Warrants
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share, amount	4,327,353	0
Class of Warrant or Right, Outstanding			7,747,589
Equity Option
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share, amount	480,124	426,824
Restricted Stock Units (RSUs)
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share, amount	1,744,028	1,958,045
Antidulitive Securities Outstanding Shares Under Average Market Price	401,636	116,867
Merger Warrants
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share, amount	2,981,010	8,480,000
Class of Warrant or Right, Exercise Price of Warrants or Rights	$ 11.50
Class of Warrant or Right, Outstanding	5,962,020

Warrant Repurchase Program (Det

Warrant Repurchase Program (Details) - USD ($)	1 Months Ended			3 Months Ended
	Mar. 31, 2022	Feb. 28, 2022	Jan. 31, 2022	Mar. 31, 2022	Nov. 04, 2021
Accelerated Share Repurchases [Line Items]
Stock Repurchase Program, Authorized Amount					$ 25,000,000
Stock Repurchased During Period, Shares	177,230	505,597	1,009,802	1,692,629
Accelerated Share Repurchases, Final Price Paid Per Share	$ 2.06	$ 1.79	$ 1.48	$ 1.64
Approximate Dollar Value of Warrants Remaining	$ 10,167	$ 10,536	$ 11,457
Stock Repurchased Under Program, Shares	10,963,160			10,963,160

Earnings per share - Narrative

Earnings per share - Narrative (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Aug. 02, 2021
Class of Stock [Line Items]
Share-based compensation expense	$ 1,630	$ 727
Merger Warrants - Private
Class of Stock [Line Items]
Class of Warrant or Right, Outstanding	295,000
Merger Warrants
Class of Stock [Line Items]
Class of Warrant or Right, Outstanding	5,962,020
Merger Warrants
Class of Stock [Line Items]
Class of Warrant or Right, Outstanding	5,962,020
Class of Warrant or Right, Exercise Price of Warrants or Rights	$ 11.50
Prefunded Warrants
Class of Stock [Line Items]
Class of Warrant or Right, Outstanding			7,747,589

Income taxes (Details)

Income taxes (Details) - USD ($)	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Income Tax Contingency [Line Items]
Statutory federal tax rate	21.00%
Effective tax rates	29.70%	10.50%
Increase (decrease) in uncertain tax positions	$ 0
Social Security Tax Rate Percent	6.20%
Accrued Payroll Taxes Deferred	$ 7,000,000
Minimum
Income Tax Contingency [Line Items]
State tax rate	0.80%
Maximum
Income Tax Contingency [Line Items]
State tax rate	12.00%

Segments (Details)

Segments (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Segment Reporting Information [Line Items]
Revenue	$ 360,095	$ 276,412
Segment revenue as a percentage of total revenue	100.00%	100.00%
Gross Profit	$ 3,830	$ 16,541
Gross Profit Margin	1.10%	6.00%
Renewables Segment
Segment Reporting Information [Line Items]
Revenue	$ 243,614	$ 180,374
Segment revenue as a percentage of total revenue	67.70%	65.30%
Gross Profit	$ 1,301	$ 12,180
Gross Profit Margin	0.50%	6.80%
Specialty Civil Segment
Segment Reporting Information [Line Items]
Revenue	$ 116,481	$ 96,038
Segment revenue as a percentage of total revenue	32.30%	34.70%
Gross Profit	$ 2,529	$ 4,361
Gross Profit Margin	2.20%	4.50%

Investments, Equity Method an_3

Investments, Equity Method and Joint Ventures (Details) - USD ($)	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Dec. 31, 2021
Schedule of Operating Activities of Joint Ventures [Line Items]
Cash and cash equivalents	$ 28,732,000		$ 124,027,000
Accounts receivable, net	254,540,000		280,700,000
Contract assets	220,119,000		214,298,000
Accounts payable	131,415,000		164,925,000
Contract liabilities	148,452,000		126,128,000
Noncontrolling Interest in Joint Ventures	0.25
Revenue	360,095,000	$ 276,412,000
Cost of revenue	356,265,000	259,871,000
Rail Joint Venture Member
Schedule of Operating Activities of Joint Ventures [Line Items]
Cash and cash equivalents	9,049,000		8,850,000
Accounts receivable, net	367,000		874,000
Contract assets	2,919,000		2,796,000
Accounts payable	2,161,000		2,591,000
Contract liabilities	7,458,000		7,353,000
Noncontrolling Interest in Joint Ventures	2,716,000		$ 2,576,000
Revenue	1,123,000	4,501,000
Cost of revenue	$ 983,000	$ 4,501,000

Related party transactions (Det

Related party transactions (Details)	Aug. 02, 2021segment
Ares
Related Party Transaction [Line Items]
Seats on Board of Directors	2