Mistras (MG) 10-K 15 Mar 23 2022 FY Annual report Financial data

Cover

Cover - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Mar. 10, 2023	Jun. 30, 2022
Cover [Abstract]
Document Type	10-K
Document Annual Report	true
Document Period End Date	Dec. 31, 2022
Document Transition Report	false
Entity File Number	001-34481
Entity Registrant Name	Mistras Group, Inc.
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	22-3341267
Entity Address, Address Line One	195 Clarksville Road
Entity Address, City or Town	Princeton Junction
Entity Address, State or Province	NJ
Entity Address, Postal Zip Code	08550
City Area Code	609
Local Phone Number	716-4000
Title of 12(b) Security	Common Stock, par value $.01 par value
Trading Symbol	MG
Security Exchange Name	NYSE
Entity Well-known Seasoned Issuer	No
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
ICFR Auditor Attestation Flag	true
Entity Shell Company	false
Entity Public Float			$ 119.1
Entity Common Stock, Shares Outstanding		29,926,879
Documents Incorporated by Reference	Information required by Part III (Items 10, 11, 12, 13 and 14) is incorporated by reference to portions of the registrant’s definitive proxy statement for its 2023 annual meeting of shareholders (the “Proxy Statement”), which is expected to be filed not later than 120 days after the registrant’s fiscal year ended December 31, 2022. Except as expressly incorporated by reference, the Proxy Statement shall not be deemed to be a part of this report on Form 10-K.
Entity Central Index Key	0001436126
Current Fiscal Year End Date	--12-31
Amendment Flag	false
Document Fiscal Year Focus	2022
Document Fiscal Period Focus	FY

Audit Information

Audit Information	12 Months Ended
	Dec. 31, 2022
Audit Information [Abstract]
Auditor Name	KPMG LLP
Auditor Location	Short Hills, New Jersey
Auditor Firm ID	185

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Current Assets
Cash and cash equivalents	$ 20,488	$ 24,110
Accounts receivable, net	123,657	109,511
Inventories	13,556	12,686
Prepaid expenses and other current assets	10,181	15,031
Total current assets	167,882	161,338
Property, plant and equipment, net	77,561	86,578
Intangible assets, net	49,015	59,381
Goodwill	199,635	205,439
Deferred income taxes	779	2,174
Other assets	40,032	47,285
Total assets	534,904	562,195
Current Liabilities
Accounts payable	12,532	12,870
Accrued expenses and other current liabilities	77,844	83,863
Current portion of long-term debt	7,425	20,162
Current portion of finance lease obligations	4,201	3,765
Income taxes payable	1,726	755
Total current liabilities	103,728	121,415
Long-term debt, net of current portion	183,826	182,403
Obligations under finance leases, net of current portion	10,045	9,752
Deferred income taxes	6,283	8,385
Other long-term liabilities	32,273	39,328
Total Liabilities	336,155	361,283
Commitments and contingencies
Equity
Preferred stock, 10,000,000 shares authorized	0	0
Common stock, $0.01 par value, 200,000,000 shares authorized, 29,895,487 and 29,546,263 shares issued	298	295
Additional paid-in capital	243,031	238,687
Accumulated Deficit	(11,489)	(17,988)
Accumulated other comprehensive loss	(33,390)	(20,311)
Total Mistras Group, Inc. stockholders’ equity	198,450	200,683
Non-controlling interests	299	229
Total Equity	198,749	200,912
Total Liabilities and Equity	$ 534,904	$ 562,195

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parenthetical) - $ / shares	Dec. 31, 2022	Dec. 31, 2021
Statement of Financial Position [Abstract]
Preferred stock, shares authorized (in shares)	10,000,000	10,000,000
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized (in shares)	200,000,000	200,000,000
Common stock, shares issued (in shares)	29,895,487	29,546,263

Consolidated Statements of Inco

Consolidated Statements of Income (Loss) - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Income Statement [Abstract]
Revenue	$ 687,373	$ 677,131	$ 592,571
Cost of revenue	466,567	457,013	391,855
Depreciation	22,633	22,971	22,185
Gross profit	198,173	197,147	178,531
Selling, general and administrative expenses	166,595	161,334	157,157
Bad debt provision for troubled customers, net of recoveries	42	0	0
Impairment charges	0	0	106,062
Legal settlement and litigation charges (benefit), net	(994)	2,042	(220)
Research and engineering	1,994	2,518	2,892
Depreciation and amortization	10,661	11,950	13,520
Acquisition-related expense, net	76	1,133	337
Income (loss) from operations	19,799	18,170	(101,217)
Interest expense	10,505	10,882	12,955
Income (loss) before provision (benefit) for income taxes	9,294	7,288	(114,172)
Provision (benefit) for income taxes	2,720	3,395	(14,706)
Net income (loss)	6,574	3,893	(99,466)
Less: net income (loss) attributable to noncontrolling interests, net of taxes	75	33	(5)
Net income (loss) attributable to Mistras Group, Inc.	$ 6,499	$ 3,860	$ (99,461)
Earnings (loss) per common share
Basic (in dollars per share)	$ 0.22	$ 0.13	$ (3.41)
Diluted (in dollars per share)	$ 0.21	$ 0.13	$ (3.41)
Weighted average common shares outstanding:
Basic (in shares)	29,901	29,572	29,147
Diluted (in shares)	30,229	30,130	29,147

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ 6,574	$ 3,893	$ (99,466)
Other comprehensive income (loss):
Foreign currency translation adjustments	(13,084)	(4,252)	5,227
Comprehensive loss	(6,510)	(359)	(94,239)
Less: net income (loss) attributable to noncontrolling interests, net of taxes	75	33	(5)
Less: Foreign currency translation adjustments attributable to noncontrolling interests	(5)	(2)	3
Comprehensive loss attributable to Mistras Group, Inc.	$ (6,580)	$ (390)	$ (94,237)

Consolidated Statements of Equi

Consolidated Statements of Equity - USD ($) shares in Thousands, $ in Thousands	Total	Total Mistras Group, Inc. Stockholders’ Equity	Common Stock	Additional paid-in capital	Retained earnings (deficit)	Accumulated other comprehensive income (loss)	Noncontrolling Interest
Beginning Balance (in shares) at Dec. 31, 2019			28,945
Beginning Balance at Dec. 31, 2019	$ 286,022	$ 285,822	$ 289	$ 229,205	$ 77,613	$ (21,285)	$ 200
Increase (Decrease) in Stockholders' Equity
Net income (loss)	(99,466)	(99,461)			(99,461)		(5)
Other comprehensive income (loss)	5,227	5,224				5,224	3
Share-based compensation (in shares)			0
Share-based compensation	5,930	5,930		5,930
Net settlement on vesting of restricted stock units (in shares)			289
Net settlement of restricted stock units	$ (494)	(494)	$ 3	(497)
Exercise of stock options (in shares)	0		0
Exercise of stock options	$ 0	0		0
Ending Balance (in shares) at Dec. 31, 2020			29,234
Ending Balance at Dec. 31, 2020	197,219	197,021	$ 292	234,638	(21,848)	(16,061)	198
Increase (Decrease) in Stockholders' Equity
Net income (loss)	3,893	3,860			3,860		33
Other comprehensive income (loss)	(4,252)	(4,250)				(4,250)	(2)
Share-based compensation	5,421	5,421		5,421
Net settlement on vesting of restricted stock units (in shares)			312
Net settlement of restricted stock units	$ (1,369)	(1,369)	$ 3	(1,372)
Exercise of stock options (in shares)	0
Ending Balance (in shares) at Dec. 31, 2021			29,546
Ending Balance at Dec. 31, 2021	$ 200,912	200,683	$ 295	238,687	(17,988)	(20,311)	229
Increase (Decrease) in Stockholders' Equity
Net income (loss)	6,574	6,499			6,499		75
Other comprehensive income (loss)	(13,084)	(13,079)				(13,079)	(5)
Share-based compensation	5,335	5,335		5,335
Net settlement on vesting of restricted stock units (in shares)			349
Net settlement of restricted stock units	$ (988)	(988)	$ 3	(991)
Exercise of stock options (in shares)	0
Ending Balance (in shares) at Dec. 31, 2022			29,895
Ending Balance at Dec. 31, 2022	$ 198,749	$ 198,450	$ 298	$ 243,031	$ (11,489)	$ (33,390)	$ 299

Consolidated Statements of Cash

Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Cash flows from operating activities
Net income (loss)	$ 6,574	$ 3,893	$ (99,466)
Adjustments to reconcile net income (loss) to net cash provided by operating activities
Depreciation and amortization	33,294	34,921	35,705
Deferred income taxes	(517)	87	(13,409)
Share-based compensation expense	5,335	5,421	5,851
Impairment charges	0	0	106,062
Bad debt provision for troubled customers, net of recoveries	42	0	0
Foreign currency (gain) loss	(208)	417	3,010
Payment of finance costs	(400)	0	0
Fair value adjustments to contingent consideration	45	949	337
Other	786	119	2,398
Changes in operating assets and liabilities, net of effect of acquisitions and dispositions
Accounts receivable	(17,225)	(3,979)	27,313
Inventories	(1,283)	278	84
Prepaid expenses and other assets	5,959	943	(1,288)
Accounts payable	(93)	(1,139)	(1,020)
Accrued expenses and other liabilities	(6,454)	2,268	1,841
Income taxes payable	1,084	(1,917)	384
Payment of contingent consideration in excess of initial estimate	(533)	0	0
Net cash provided by operating activities	26,406	42,261	67,802
Cash flows from investing activities
Purchase of property, plant and equipment	(12,591)	(18,161)	(15,396)
Purchase of intangible assets	(825)	(1,115)	(376)
Acquisition of businesses, net of cash acquired	0	(440)	0
Proceeds from sale of equipment	1,178	1,165	803
Net cash used in investing activities	(12,238)	(18,551)	(14,969)
Cash flows from financing activities
Repayment of finance lease obligations	(4,140)	(4,060)	(4,095)
Proceeds from borrowings of long-term debt	125,000	0	2,284
Repayment of long-term debt	(81,405)	(16,262)	(5,976)
Proceeds from revolver	192,501	89,000	35,750
Repayments of revolver	(246,750)	(89,065)	(68,050)
Payments of financing costs	(147)	(550)	(1,497)
Payment of contingent consideration for business acquisitions	(405)	(938)	(2,091)
Taxes paid related to net share settlement of share-based awards	(977)	(1,370)	(494)
Net cash used in financing activities	(16,323)	(23,245)	(44,169)
Effect of exchange rate changes on cash and cash equivalents	(1,467)	(2,115)	2,080
Net change in cash and cash equivalents	(3,622)	(1,650)	10,744
Cash and cash equivalents:
Beginning of period	24,110	25,760	15,016
End of period	20,488	24,110	25,760
Supplemental disclosure of cash paid
Interest, net	8,603	10,078	12,465
Income taxes, net	(3,069)	4,707	(543)
Noncash investing and financing
Equipment acquired through finance lease obligations	$ 5,076	$ 2,923	$ 2,849

Summary of Significant Accounti

Summary of Significant Accounting Policies and Practices	12 Months Ended
	Dec. 31, 2022
Accounting Policies [Abstract]
Summary of Significant Accounting Policies and Practices	Summary of Significant Accounting Policies and Practices Description of Business Mistras Group, Inc. and subsidiaries (the Company) is a leading “one source” multinational provider of integrated technology-enabled asset protection solutions helping to maximize the safety and operational uptime for civilization's most critical industrial and civil assets. Backed by an innovative, data-driven asset protection portfolio, proprietary technologies and decades-long legacy of industry leadership, the Company helps clients with asset-intensive infrastructure in the oil and gas, aerospace and defense, industrials, power generation and transmission (including alternative and renewable energy), other process industries and infrastructure, research and engineering and other industries towards achieving and maintaining operational excellence. By supporting these organizations that help fuel our vehicles and power our society; inspecting components that are trusted for commercial, defense, and space craft; and building real-time monitoring systems to help avoid catastrophic incidents, the Company helps the world at large. The Company enhances value for its clients by integrating asset protection throughout supply chains and centralizing integrity data through a suite of IIoT - connected digital software and monitoring solutions, including OneSuite, which serves as an ecosystem platform, pulling together all of the Company’s software and data services capabilities, for the benefit of its customers. The Company's core capabilities also include non-destructive testing (“NDT”) field inspections enhanced by advanced robotics, laboratory quality control and assurance testing, sensing technologies and NDT equipment, asset and mechanical integrity engineering services, and light mechanical maintenance and access services. Recent Developments Issues related to the COVID-19 coronavirus (COVID-19) pandemic have subsided significantly during 2022 as compared to 2021. The Russian-Ukrainian war is creating disruption in the oil and gas market and the supply chain in general, which is resulting in some disruption to our business operations. With oil prices high, refineries are working at full capacity and are deferring maintenance and inspection work as much as possible, which is impacting our business as well. Overall, the Company has taken actions to help ensure the health and safety of Company employees and those of its customers and suppliers; maintain business continuity and financial strength and stability; and serve customers as they provide essential products and services to the world. Earlier in 2022, the Company eliminated substantially all of the COVID related cost reduction initiatives undertaken in 2020, including re-installment of the savings plan employer match and increasing wages back to pre-pandemic amounts. The Company is currently unable to predict with certainty the overall impact that the factors discussed above and the effect of inflationary pressures may have on its business, results of operations or liquidity or in other ways which the Company cannot yet determine. The Company’s European operations are currently experiencing increased costs associated with higher energy costs, among others, due in part to the Russian-Ukrainian war. The Company will continue to monitor market conditions and respond accordingly. Principles of Consolidation The Company follows guidance on the consolidation of variable interest entities ("VIEs") that requires companies to utilize a qualitative approach to determine whether it is the primary beneficiary of a VIE. The process for identifying the primary beneficiary of a VIE requires consideration of the factors that indicate a party has the power to direct the activities that most significantly impact the VIE’s economic performance, including powers granted to the VIE’s program manager, powers contained in the VIE governing board and, to a certain extent, a company’s economic interest in the VIE. The Company analyzes its joint ventures and classifies them as either: • a VIE that must be consolidated because the Company is the primary beneficiary, or the joint venture is not a VIE and the Company holds the majority voting interest with no significant participative rights available to the other partners; or • a VIE that does not require consolidation and is treated as an equity method investment because the Company is not the primary beneficiary or the joint venture is not a VIE and the Company does not hold the majority voting interest. As part of the above analysis, if it is determined that the Company has the power to direct the activities that most significantly impact the joint venture’s economic performance, the Company considers whether or not it has the obligation to absorb losses or rights to receive benefits of the VIE that could potentially be significant to the VIE. The Company became the primary beneficiary in July 2020 of a VIE in which the Company has a 49% interest in a limited partnership, and a 49% shareholder in the corporate general partner of the limited partnership. The Company consolidated the financial statements of the VIE with the financial statements of the Company. As of and for the year ended December 31, 2022, the VIE had immaterial assets and had approximately $4.7 million revenue. The Company is the primary sub-contractor of the VIE. The accompanying audited consolidated financial statements include the accounts of Mistras Group, Inc. as well as its wholly-owned subsidiaries, majority-owned subsidiaries and consolidated VIE. For subsidiaries in which the Company’s ownership interest is less than 100%, the non-controlling interests are reported in stockholders’ equity in the accompanying Consolidated Balance Sheets. The non-controlling interests in net results, net of tax, is classified separately in the accompanying Consolidated Statements of Income (Loss). All significant intercompany accounts and transactions have been eliminated in consolidation. The results of operations of companies acquired are included from the date of acquisition. Reclassifications Certain amounts in prior periods have been reclassified to conform to the current year presentation. Such reclassifications did not have a material effect on the Company's financial condition or results of operations as previously reported. Use of Estimates The preparation of financial statements in accordance with U.S. generally accepted accounting principles ("U.S. GAAP") requires that the Company make estimates and assumptions that affect the reported amounts of assets, liabilities, revenue and expenses and disclosure of contingent assets and liabilities at the date of the financial statements. The Company bases its estimates and assumptions on historical experience, known or expected trends and various other assumptions that it believes to be reasonable. As future events and their effects cannot be determined with precision, actual results could differ significantly from these estimates, which may cause the Company’s future results to be significantly affected. Cash and Cash Equivalents The Company considers all highly liquid investments purchased with an original maturity of three months or less to be cash equivalents. Accounts Receivable and Allowance for Credit Losses The Company maintains an allowance for credit losses on its accounts receivable balances, which represents its best estimate of current expected credit losses over the contractual life of the accounts receivable. When evaluating the adequacy of its allowance for credit losses each reporting period, the Company analyzes accounts receivable balances with similar risk characteristics on a collective basis, considering factors such as the aging of receivable balances, payment terms (primarily with 30 day terms), geographic location, historical loss experience, current information and future expectations (generally considered one year which is consistent with expected collectability of the Company's trade receivables). The Company monitors and considers whether historical loss rates are consistent with expectation of supportable forward-looking estimates for its trade receivables noting any current or future economic considerations that would require adjusting the Company’s historical loss experience. Each reporting period, the Company reassesses whether any accounts receivable no longer share similar risk characteristics and should instead be evaluated as part of another pool or on an individual basis. Changes to the allowance for credit losses are adjusted through credit loss expense, which is presented within Selling, general and administrative expenses in the Consolidated Statements of Income (Loss). Concentration of Credit Risk For each of the years ended December 31, 2022 and 2021, no customer represented 10% or more of the Company's revenue. Financial instruments that potentially subject the Company to concentrations of credit risk consist principally of cash and cash equivalents and accounts receivable. At times, cash deposits may exceed the limits insured by the Federal Deposit Insurance Corporation. The Company believes it is not exposed to any significant credit risk or risk of nonperformance of financial institutions. Inventories Inventories are stated at the lower of cost or net realizable value, as determined by using the first-in, first-out method, or market. Work in process and finished goods inventory include material, direct labor, variable costs and overhead. Purchased and Internal-Use Software The Company capitalizes certain costs that are incurred to purchase or to create and implement internal-use software, which includes software coding, installation and testing. Capitalized costs are amortized on a straight-line basis over three years, the estimated useful life of the software. Property, Plant and Equipment Property, plant and equipment are recorded at cost. Depreciation of property, plant and equipment is computed utilizing the straight-line method over the estimated useful lives of the assets. Amortization of leasehold improvements is computed utilizing the straight-line method over the shorter of the remaining lease term or estimated useful life. Repairs and maintenance costs are expensed as incurred. Goodwill Goodwill represents the excess purchase price of acquired businesses over the fair values attributed to underlying net tangible assets and identifiable intangible assets. The Company tests goodwill for impairment at a “reporting unit” level (which for the Company is represented by (i) its Services segment, (ii) its Products and Systems segment, (iii) the European component of its International segment and (iv) the Brazilian component of its International segment). The Company's annual impairment test is conducted on the first day of the Company's fourth quarter, which is October 1. Goodwill is also tested for impairment whenever an event occurs or circumstances change that would more likely than not reduce the fair value of a reporting unit below its carrying amount. In testing for goodwill impairment, the Company has the option to first assess qualitative factors to determine whether the existence of events or circumstances lead to a determination that it is more likely than not that the fair value of a reporting unit is less than its carrying amount. If, after assessing the totality of events and circumstances, the Company concludes that it is not more likely than not that the fair value of a reporting unit is less than its carrying amount, then performing a quantitative impairment test is not necessary. If the Company concludes otherwise, the Company is required to perform a quantitative impairment test. If the fair value of a reporting unit is less than its carrying value, this is an indicator that the goodwill assigned to that reporting unit may be impaired. An impairment will be recorded in the amount that the fair value is less than the carrying value. The Company considers the income and market approaches to estimating the fair value of its reporting units, which requires significant judgment in evaluation of economic and industry trends, estimated future cash flows, discount rates and other factors. See Note 8- Goodwill for additional information related to the Company's goodwill impairment test during 2022. Impairment of Long-lived Assets The Company reviews the recoverability of its long-lived assets (or asset groups) whenever events or changes in circumstances indicate that the carrying amount of the long-lived asset (group) might not be recoverable. The assessment for potential impairment is based primarily on the Company’s ability to recover the carrying value of its long-lived assets from expected future undiscounted cash flows. If the total expected future undiscounted cash flows are less than the carrying amount of the assets, a loss is recognized for the difference between fair value (computed based upon the expected future discounted cash flows) and the carrying value of the assets. Acquisitions The Company allocates the purchase price of acquired businesses to their identifiable tangible assets and liabilities as well as identifiable intangible assets, such as customer relationships, technology, non-compete agreements and trade names. Certain estimates and judgments are required in the application of the fair value techniques, including estimates of the respective acquisition's future performance and related cash flows, selection of a discount rate and economic lives, and use of Level 3 measurements as defined in ASC No. 820, Fair Value Measurements and Disclosure. Deferred taxes are recorded for any differences between the assigned values and tax bases of assets and liabilities. Research and Engineering Research and product development costs are expensed as incurred. Advertising, Promotions and Marketing The costs for advertising, promotion and marketing programs are expensed as incurred and are included in selling, general and administrative expenses. Advertising expense was approximately $2.0 million, $1.0 million and $0.8 million for the years ended December 31, 2022, 2021 and 2020, respectively. Fair Value of Financial Instruments The carrying amounts of cash and cash equivalents, accounts receivable, accounts payable and other financial current assets and liabilities approximate fair value based on the short-term nature of the items. Foreign Currency Translation The financial position and results of operations of the Company’s foreign subsidiaries are measured using their functional currencies, which are their local currencies. Assets and liabilities of foreign subsidiaries are translated into the U.S. Dollar at the exchange rates in effect at the balance sheet date. Income and expenses are translated at the average exchange rate during the period. Translation gains and losses are reported as a component of other comprehensive income (loss) for the period and included in accumulated other comprehensive income (loss) within stockholders’ equity. Foreign currency (gains) losses arising from transactions denominated in currencies other than the functional currency are included in net income, reported in selling, general and administrative expenses, and were approximately $(0.2) million, $0.4 million, and $3.0 million for the years ended December 31, 2022, 2021 and 2020, respectively. Self-Insurance The Company is self-insured for certain losses relating to workers’ compensation and health benefit claims. The Company maintains third-party excess insurance coverage for all workers' compensation and health benefit claims in excess of approximately $0.3 million per occurrence to reduce its exposure from such claims. Self-insured losses are accrued when it is probable that an uninsured claim has been incurred but not reported and the amount of the loss can be reasonably estimated at the balance sheet date. Share-based Compensation The value of services received from employees and directors in exchange for an award of an equity instrument is measured based on the grant-date fair value of the award. Such value is recognized as a non-cash expense on a straight-line basis over the minimum period the individual provides services, which is typically the vesting period of the award with the exception of awards with graded vesting that contain an internal performance measure where each tranche is recognized on a straight-line basis over its vesting period subject to the probability of meeting the performance requirements and adjusted for the number of shares expected to be earned. Awards to certain employees eligible for retirement prior to the award becoming fully vested are amortized to expense over the period through the date that the employee first becomes eligible to retire and is no longer required to provide service to earn the award. As share-based compensation expense is based on awards ultimately expected to vest, the amount of expense is reduced for estimated forfeitures. The cost of these awards is recorded in selling, general and administrative expenses in the Company’s Consolidated Statements of Income (Loss). Income Taxes Income taxes are accounted for under the asset and liability method. We recognize deferred tax assets and liabilities at enacted income tax rates for the temporary differences between the financial reporting bases and the tax bases of our assets and liabilities. Any effects of changes in income tax rates or tax laws are included in the provision for income taxes in the period of enactment. Our net deferred tax assets primarily consist of net operating loss carry forwards, or NOLs. A valuation allowance is provided if it is more likely than not that some or all of a deferred income tax asset will not be realized. A current tax liability or asset is recognized for the estimated taxes payable or refundable on tax returns for the current and prior years. We recognize the tax benefit from an uncertain tax position only if it is more likely than not that the tax position will be sustained on examination by the taxing authorities, based on the technical merits of the position. The tax benefits recognized in the financial statements from such a position are measured based on the largest benefit that has a greater than 50% likelihood of being realized upon ultimate resolution. Recent Accounting Pronouncements In March 2020 and updated in January 2021, the FASB issued Accounting Standards Update ("ASU") 2020-04 and 2021-01, “Reference Rate Reform (Topic 848): Facilitation of the Effects of Reference Rate Reform on Financial Reporting.” The amendments provide optional guidance for a limited period of time to ease the potential burden in accounting for (or recognizing the effects of) reference rate reform on financial reporting. The guidance provides optional expedients and exceptions for applying U.S. GAAP to contract modifications and hedging relationships, subject to meeting certain criteria, that reference LIBOR or another rate that is expected to be discontinued. The amendments in ASU 2020-04 are effective for all entities as of March 12, 2020 through December 31, 2024. The Company is currently evaluating applicable contracts and the available expedients provided by the new guidance.

Revenue

Revenue	12 Months Ended
	Dec. 31, 2022
Revenue from Contract with Customer [Abstract]
Revenue	Revenue The Company derives the majority of its revenue by providing services on a time and material basis that are short-term in nature. The Company accounts for revenue in accordance with ASC Topic 606, Revenue from Contracts with Customers. Performance Obligations The Company provides highly integrated and bundled inspection services to its customers. The majority of the Company's contracts have a single performance obligation as the promise to transfer the individual goods or services is not separately identifiable from other promises in the contracts and is, therefore, not distinct. For contracts with multiple performance obligations, the Company allocates the contract’s transaction price to each performance obligation using the Company's best estimate of the standalone selling price of each distinct good or service in the contract. The primary method used to estimate standalone selling price is a relative selling price based on price lists. Contract modifications are not routine in the performance of the Company's contracts. Generally, when contracts are modified, the modification is to account for changes in scope to the goods and services that are provided. In most instances, contract modifications are for goods or services that are distinct, and, therefore, are accounted for as a separate contract. The Company's performance obligations are satisfied over time as work progresses or at a point in time. The majority of the Company's revenue is recognized over time as work progresses for the Company's service deliverables, which includes providing testing, inspection and mechanical services to the Company's customers. Revenue is recognized over time, based on time and material incurred to date which best portrays the transfer of control to the customer. The Company also utilizes an available practical expedient that provides for revenue to be recognized in an amount that corresponds directly with the value to the customer of the entity’s performance completed to date. Fixed fee arrangements are determined based on expected labor, material, and overhead to be consumed on fulfillment of such services. For these arrangements, revenue is recognized on a cost-to-cost method tracked on an input basis. The majority of the Company's revenue recognized at a point in time is related to product sales when the customer obtains control of the asset, which is generally upon shipment to the customer. Contract costs include labor, material and overhead. The Company expects any significant remaining performance obligations to be satisfied within one year. Contract Estimates The majority of the Company's revenues are short-term in nature. The Company enters into master service agreements ("MSAs") with customers that specify an overall framework and contract terms. The actual contracting to provide services or furnish products are triggered by a work order, purchase order, or some similar document issued pursuant to an MSA which sets forth the scope of services and/or identifies the products to be provided. From time-to-time, the Company may enter into longer-term contracts, which can range from several months to several years. Revenue on certain contracts is recognized as work is performed based on total costs incurred to date in relation to the total estimated costs for the performance of the contract at completion. This includes contract estimates of costs to be incurred for the performance of the contract. Cost estimation is based upon the professional knowledge and experience of the Company's project managers, engineers and financial professionals. Factors that are considered in estimating the work to be completed include the availability of materials, the effect of any delays in the Company's project performance and the recoverability of any claims. Whenever revisions of estimates, contract costs and/or contract values indicate that the contract costs will exceed estimated revenues, thus creating a loss, a provision for the total estimated loss is recorded in that period. Revenue by Category The following series of tables present the Company's disaggregated revenue: Revenue by industry was as follows (in thousands): Year ended December 31, 2022 Services International Products Corp/Elim Total Oil & Gas $ 356,763 $ 30,654 $ 335 $ — $ 387,752 Aerospace & Defense 61,475 18,763 314 — $ 80,552 Industrials 38,197 23,703 2,083 — $ 63,983 Power Generation and Transmission 31,197 8,304 2,603 — $ 42,104 Other Process Industries 40,778 14,021 28 — $ 54,827 Infrastructure, Research & Engineering 15,283 7,946 3,994 — $ 27,223 Petrochemical 15,360 536 — — $ 15,896 Other 14,283 8,498 3,370 (11,115) $ 15,036 Total $ 573,336 $ 112,425 $ 12,727 $ (11,115) $ 687,373 Year ended December 31, 2021 Services International Products Corp/Elim Total Oil & Gas $ 330,880 $ 35,232 $ 808 $ — $ 366,920 Aerospace & Defense 51,593 16,513 286 — $ 68,392 Industrials 41,873 24,000 1,842 — $ 67,715 Power Generation and Transmission 39,966 9,927 2,853 — $ 52,746 Other Process Industries 38,742 12,593 64 — $ 51,399 Infrastructure, Research & Engineering 16,809 11,496 3,985 — $ 32,290 Petrochemical 19,378 227 — — 19,605 Other 16,146 7,257 3,993 (9,332) $ 18,064 Total $ 555,387 $ 117,245 $ 13,831 $ (9,332) $ 677,131 Year ended December 31, 2020 Services International Products Corp/Elim Total Oil & Gas $ 279,723 $ 39,383 $ 377 $ — $ 319,483 Aerospace & Defense 50,813 18,166 1,292 — $ 70,271 Industrials 44,919 19,657 1,852 — $ 66,428 Power Generation and Transmission 30,005 7,559 2,323 — $ 39,887 Other Process Industries 24,671 10,029 171 — $ 34,871 Infrastructure, Research & Engineering 17,070 10,353 6,364 — $ 33,787 Petrochemical 18,882 345 53 — 19,280 Other 10,081 2,064 4,017 (7,598) $ 8,564 Total 476,164 107,556 16,449 $ (7,598) $ 592,571 Revenue per key geographic location was as follows (in thousands): Year ended December 31, 2022 Services International Products Corp/Elim Total United States $ 485,551 $ 910 $ 6,495 $ (3,083) $ 489,873 Other Americas 83,877 9,076 406 (4,105) 89,254 Europe 2,811 99,714 1,896 (3,502) 100,919 Asia-Pacific 1,097 2,725 3,930 (425) 7,327 Total $ 573,336 $ 112,425 $ 12,727 $ (11,115) $ 687,373 Year ended December 31, 2021 Services International Products Corp/Elim Total United States $ 472,125 $ 912 $ 6,469 $ (4,284) $ 475,222 Other Americas 80,013 5,003 395 (1,768) 83,643 Europe 1,841 108,411 2,174 (2,812) 109,614 Asia-Pacific 1,408 2,919 4,793 (468) 8,652 Total $ 555,387 $ 117,245 $ 13,831 $ (9,332) $ 677,131 Year ended December 31, 2020 Services International Products Corp/Elim Total United States $ 406,437 $ 911 $ 7,551 $ (3,410) $ 411,489 Other Americas $ 68,150 $ 4,581 $ 550 $ (446) 72,835 Europe $ 904 $ 99,953 $ 3,154 $ (3,470) 100,541 Asia-Pacific $ 673 $ 2,111 $ 5,194 $ (272) 7,706 Total $ 476,164 $ 107,556 $ 16,449 $ (7,598) $ 592,571 Contract Balances The timing of revenue recognition, billings and cash collections results in billed accounts receivable, unbilled receivables (contract assets), and customer advances and deposits (contract liabilities) on the Consolidated Balance Sheets. Amounts are generally billed as work progresses in accordance with agreed-upon contractual terms, generally at periodic intervals (e.g., weekly, bi-weekly or monthly). Generally, billing occurs subsequent to revenue recognition, resulting in contract assets. However, the Company sometimes receives advances or deposits from its customers before revenue is recognized, resulting in contract liabilities. These assets and liabilities are aggregated on an individual contract basis and reported on the Consolidated Balance Sheets at the end of each reporting period within accounts receivable, net or accrued expenses and other current liabilities. Revenue recognized for 2022 and 2021, that was included in the contract liability balance at the beginning of the year was $4.7 million and $4.6 million, respectively. Changes in the contract asset and liability balances during the years ended December 31, 2022 and 2021, were not impacted by any other factors. The Company applies the practical expedient to expense incremental

Earnings per Share

Earnings per Share	12 Months Ended
	Dec. 31, 2022
Earnings Per Share [Abstract]
Earnings per Share	Earnings per Share Basic earnings (loss) per share is computed by dividing net income (loss) by the weighted average number of shares outstanding during the period. Diluted earnings per share is computed by dividing net income by the sum of (i) the weighted average number of shares of common stock outstanding during the period and (ii) the dilutive effect of assumed conversion of equity awards using the treasury stock method. With respect to the number of weighted average shares outstanding (denominator), diluted shares reflects: (i) the exercise of options to acquire common stock to the extent that the options’ exercise prices are less than the average market price of common stock during the period and (ii) the pro forma vesting of restricted stock units. The following table sets forth the computations of basic and diluted earnings (loss) per share (in thousands except share data): For the year ended December 31, 2022 2021 2020 Basic earnings (loss) per share: Numerator: Net income (loss) attributable to Mistras Group, Inc. $ 6,499 $ 3,860 $ (99,461) Denominator Weighted average common shares outstanding 29,901 29,572 29,147 Basic earnings (loss) per share $ 0.22 $ 0.13 $ (3.41) Diluted earnings (loss) per share: Numerator: Net income (loss) attributable to Mistras Group, Inc. $ 6,499 $ 3,860 $ (99,461) Denominator Weighted average common shares outstanding 29,901 29,572 29,147 Dilutive effect of stock options outstanding — 558 — Dilutive effect of restricted stock units outstanding 328 — — 30,229 30,130 29,147 Diluted earnings (loss) per share $ 0.21 $ 0.13 $ (3.41) The following potential common stock were excluded from the computation of diluted earnings per share, as the effect would have been anti-dilutive: For the year ended December 31, 2022 2021 2020 Potential common stock attributable to restricted stock units (RSUs) and performance stock units (PSUs) outstanding (1) 1,005 109 790 Potential common stock attributable to stock options outstanding 1 5 5 Total 1,006 114 795 (1) For the year ended December 31, 2020, 254 shares related to RSUs/PSUs, were excluded from the calculation of diluted EPS due to the net loss for the period.

Accounts Receivable

Accounts Receivable	12 Months Ended
	Dec. 31, 2022
Receivables [Abstract]
Accounts Receivable	Accounts Receivable Accounts receivable consist of the following (in thousands): December 31, 2022 2021 Trade accounts receivable $ 127,767 $ 112,739 Allowance for credit losses (4,110) (3,228) Accounts receivable, net $ 123,657 $ 109,511 The Company had $13.5 million and $11.9 million of unbilled revenues accrued as of December 31, 2022 and December 31, 2021, respectively, which is included within the trade accounts receivable balance above. Unbilled revenue is generally billed in the subsequent quarter to their revenue recognition. The Company considers unbilled receivables as short-term in nature as they are normally converted to trade receivables within 90 days, thus future changes in economic conditions will not have a significant effect on the credit loss estimate. The Company was contracted to perform inspections of welds on various pipeline projects in Texas for a customer. As of December 31, 2019, approximately $1.4 million of past due receivables were outstanding from this customer. The Company received notice from the customer in December 2019, alleging that the work performed was not in compliance with the contract. The Company filed a lawsuit to recover the $1.4 million and other amounts due to the Company and the customer filed a counterclaim, alleging breach of contract and seeking its damages. The Company recorded a full reserve for this receivable during 2019 and the status of this situation has not changed since 2019. See Note 18-Commitments and Contingencies for additional details.

Inventories

Inventories	12 Months Ended
	Dec. 31, 2022
Inventory Disclosure [Abstract]
Inventories	Inventories Inventories consist of the following (in thousands): December 31, 2022 2021 Raw materials $ 5,351 $ 4,794 Work in progress 336 551 Finished goods 5,475 4,621 Consumable supplies 2,394 2,720 Inventories $ 13,556 $ 12,686

Property, Plant and Equipment

Property, Plant and Equipment	12 Months Ended
	Dec. 31, 2022
Property, Plant and Equipment [Abstract]
Property, Plant and Equipment	Property, Plant and Equipment Property, plant and equipment consist of the following: December 31, Useful Life 2022 2021 (Years) (in thousands) Land $ 2,529 $ 2,762 Building and improvements 30-40 24,800 24,787 Office furniture and equipment 5-8 18,057 16,620 Machinery and equipment 5-7 251,282 250,166 296,668 294,335 Accumulated depreciation and amortization (219,107) (207,757) Property, plant and equipment, net $ 77,561 $ 86,578

Acquisitions

Acquisitions	12 Months Ended
	Dec. 31, 2022
Business Combination and Asset Acquisition [Abstract]
Acquisitions	Acquisitions Acquisitions During the year ended December 31, 2021, the Company completed one acquisition for a small NDT services company in Canada. The Company acquired 100% of the common stock in exchange for approximately $0.4 million during the first quarter of 2021. The results of the acquisition's operations are included within the Services segment and are not material to the consolidated financial statements. The Company completed its acquisition accounting for this transaction in accordance with the acquisition method of accounting for business combinations during the year ended December 31, 2021. Assets and liabilities of the acquired business were included in the Consolidated Balance Sheet based on their respective estimated fair value on the date of acquisition as determined in a purchase price allocation, using available information and making assumptions management believes are reasonable. Acquisition-Related expense In the course of its acquisition activities, the Company incurs costs in connection with due diligence, professional fees, and other expenses. Additionally, the Company adjusts the fair value of acquisition-related contingent consideration liabilities on a quarterly basis. These amounts are recorded as acquisition-related expense, net, on the Consolidated Statements of Income (Loss) and were as follows for the years ended December 31, 2022, 2021 and 2020 (in thousands): For the year ended December 31, 2022 2021 2020 Due diligence, professional fees and other transaction costs $ 31 $ 5 $ — Adjustments to fair value of contingent consideration liabilities 45 1,128 337 Acquisition-related expense, net $ 76 $ 1,133 $ 337 As of December 31, 2022, the Company’s contingent consideration liabilities are recorded on the Consolidated Balance Sheet in accrued expenses and other current liabilities.

Goodwill

Goodwill	12 Months Ended
	Dec. 31, 2022
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill	Goodwill The changes in the carrying amount of goodwill by segment is shown below (in thousands): Services International Products and Systems Total Balance at December 31, 2020 $ 190,112 $ 15,896 $ — $ 206,008 Adjustments to preliminary purchase price allocations 280 — — 280 Foreign currency translation 264 (1,113) — (849) Balance at December 31, 2021 $ 190,656 $ 14,783 $ — $ 205,439 Foreign currency translation (4,946) (858) — (5,804) Balance at December 31, 2022 $ 185,710 $ 13,925 $ — $ 199,635 The Company reviews goodwill for impairment on a reporting unit basis on October 1 of each year and whenever events or changes in circumstances indicate the carrying value of goodwill may not be recoverable. During the first quarter of 2020, the Company’s market capitalization declined significantly compared to the fourth quarter of 2019. Over the same period, the equity value of the Company’s peer group, and the overall U.S. stock market also declined significantly amid market volatility. In addition, oil prices had dropped significantly. These declines were driven in large part by the uncertainty surrounding the COVID-19 pandemic and other macroeconomic events such as the geopolitical tensions between OPEC and Russia. Based on these factors, the Company concluded that multiple triggering events occurred and, accordingly, an interim quantitative goodwill impairment test was performed for each reporting unit as of March 31, 2020 ("testing date"). During the first quarter of 2020, the Company also performed an analysis to determine any impairment of long-lived assets (see Note 9-Intangible Assets ) based on the triggering events noted above. Based upon the results of the interim quantitative goodwill impairment test during the first quarter of 2020, the Company recorded an aggregate impairment charge of $77.1 million, which consisted of $57.2 million in the services reporting unit within the Services segment, and $19.3 million in the European reporting unit and $0.6 million in the Brazilian reporting unit, both within the International segment. The impairment was calculated based on the difference between the estimated fair value and the carrying value of the reporting units and are included in Impairment charges on the Consolidated Statements of Income (Loss) for the year ended December 31, 2020. The Company performed a quantitative annual impairment test as of October 1, 2022 and 2021 and the Company did not identify any changes in circumstances that would indicate the carrying value of goodwill may not be recoverable. Additionally, through December 31, 2022, the Company did not identify any changes in circumstances that would indicate the carrying value of goodwill may not be recoverable. Significant adverse changes in future periods could negatively affect the Company's key assumptions and may result in future goodwill impairment charges which could be material.

Intangible Assets

Intangible Assets	12 Months Ended
	Dec. 31, 2022
Goodwill and Intangible Assets Disclosure [Abstract]
Intangible Assets	Intangible Assets The gross carrying amount and accumulated amortization of intangible assets were as follows (in thousands): December 31, 2022 2021 Useful Life (Years) Gross Accumulated Net Gross Accumulated Net Customer relationships 5-18 $ 109,683 $ (84,130) $ 25,553 $ 112,109 $ (80,319) $ 31,790 Software/Technology 3-15 51,028 (28,669) 22,359 52,265 (26,415) 25,850 Covenants not to compete 2-5 12,488 (12,416) 72 12,623 (12,390) 233 Other 2-12 10,389 (9,358) 1,031 10,574 (9,066) 1,508 Total $ 183,588 $ (134,573) $ 49,015 $ 187,571 $ (128,190) $ 59,381 As described in Note 8- Goodwill , during the first quarter of 2020, there were negative market indicators that were determined to be triggering events indicating a potential impairment of certain long-lived assets within asset groups in the Services, International, and Products and Systems segments, as well as Corporate and Eliminations. The asset groups are groupings of assets and liabilities determined at the lowest level for which identifiable cash flows are largely independent of the cash flows of other assets and liabilities. Recoverability testing indicated that certain intangible assets and right of use assets (See Note 17-Leases ) were potentially impaired. For asset groups that required an impairment measurement, similar to the valuations performed to determine the goodwill impairment, the Company used income and market approaches to estimate the fair value of the long-lived assets, which requires significant judgment in evaluation of the useful lives of the assets, economic and industry trends, estimated future cash flows, discount rates, and other factors. The result of the analysis was an aggregate impairment charge of $28.8 million, which consisted of $25.9 million to software/technology, $2.2 million to customer relationships, $0.5 million to other intangibles and $0.2 million to covenants not to compete, all of which are in the Services reporting unit within the Services segment and are included in Impairment charges Amortization expense for the years ended December 31, 2022, 2021 and 2020, was approximately $9.1 million, $9.7 million, and $11.0 million, respectively, including amortization of software/technology for these periods of $2.9 million, $3.0 million, and $3.6 million, respectively. Amortization expense in each of the five years and thereafter subsequent to December 31, 2022 related to the Company’s intangible assets is expected to be as follows (in thousands): Expected Amortization Expense 2023 $ 8,915 2024 7,633 2025 5,796 2026 4,988 2027 4,664 Thereafter 17,019 Total $ 49,015

Accrued Expenses and Other Curr

Accrued Expenses and Other Current Liabilities	12 Months Ended
	Dec. 31, 2022
Payables and Accruals [Abstract]
Accrued Expenses and Other Current Liabilities	Accrued Expenses and Other Current Liabilities Accrued expenses and other current liabilities consist of the following (in thousands): December 31, 2022 2021 Accrued salaries, wages and related employee benefits $ 26,684 $ 33,816 Contingent consideration 937 1,830 Accrued workers' compensation and health benefits 3,660 3,994 Deferred revenues 7,521 6,202 Right-of-use liability - Operating 10,376 10,040 Pension accrual 2,519 2,519 Other accrued expenses 26,147 25,462 Total accrued expenses and other current liabilities $ 77,844 $ 83,863

Long-Term Debt

Long-Term Debt	12 Months Ended
	Dec. 31, 2022
Debt Disclosure [Abstract]
Long-Term Debt	Long-Term Debt Long-term debt consisted of the following (in thousands): December 31, 2022 2021 Senior credit facility $ 65,250 $ 119,500 Senior secured term loan, net of unamortized debt issuance costs of $0.5 million and $0.2 million 121,399 76,673 Other 4,602 6,392 Total debt 191,251 202,565 Less: Current portion (7,425) (20,162) Long-term debt, net of current portion $ 183,826 $ 182,403 Senior Credit Facility Prior to entering into the New Credit Agreement (defined and described below), the Company had a credit agreement with its banking group (the "Credit Agreement") which provided the Company with a $150 million revolving credit facility and a $100 million term loan. The Credit Agreement was most recently amended on May 19, 2021 and had a maturity date of December 12, 2023. On August 1, 2022, the Company entered into a new credit agreement (the “New Credit Agreement”) which replaced the prior Credit Agreement and provides the Company with a $190 million 5-year committed revolving credit facility and a $125 million term loan with a balance of $121.4 million as of December 31, 2022. The New Credit Agreement permits the Company to borrow up to $100 million in non-US dollar currencies and to use up to $20 million of the credit limit for the issuance of letters of credit. Both the revolving line of credit and the term loan under the New Credit Agreement have a maturity date of July 30, 2027. The New Credit Agreement has the following key terms, conditions and financial covenants: • Borrowings bear interest at Secured Overnight Financing Rate ("SOFR") plus a credit spread adjustment and applicable SOFR margin ranging from 1.25% to 2.75%, based upon our Total Consolidated Debt Leverage Ratio (defined below); under the Credit Agreement, the margin was based upon the LIBOR margin. ◦ Total Consolidated Debt Leverage Ratio means the ratio of (a) Total Consolidated Debt to (b) EBITDA (as defined in the New Credit Agreement) for the trailing four consecutive fiscal quarters. ◦ Total Consolidated Debt means all indebtedness (including subordinated debt) of the Company on a consolidated basis. • The Company has the benefit of the lowest SOFR margin if its Total Consolidated Debt Leverage Ratio is equal to or less than 1.25 to 1.0, and the margin increases as the ratio increases, to the maximum margin if the ratio is greater than 3.75 to 1.0. The New Credit Agreement is secured by liens on substantially all the assets of the Company and certain of its U.S subsidiaries and is guaranteed by those U.S subsidiaries. • The Company has to maintain a Total Consolidated Debt Leverage Ratio of no more than 4.0 to 1.0 at the end of each quarter through June 30, 2023 and stepping down to a maximum permitted ratio of no more than 3.75 to 1.0 for the remainder of the term. • The Company has to maintain a Fixed Charge Coverage Ratio of 1.25 to 1.0 for the duration of the New Credit Agreement, as defined in the New Credit Agreement. • The New Credit Agreement limits the Company’s ability to, among other things, create liens, make investments, incur more indebtedness, merge or consolidate, make dispositions of property, pay dividends, make distributions to stockholders or repurchase our stock, enter into a new line of business, enter into transactions with affiliates and enter into burdensome agreements. • The New Credit Agreement does not limit the Company’s ability to acquire other businesses or companies except that the acquired business or company must be in the Company's line of business, the Company must be in compliance with the financial covenants on a pro forma basis after taking into account the acquisition, and the Company must provide written notice at least five • Quarterly payments on the term loan of $1.56 million through June 30, 2024, then increasing to $2.34 million through June 30, 2025, and to $3.12 million for each quarterly payment thereafter through maturity. The New Credit Agreement was accounted for as a modification and the Company expensed $0.8 million in unamortized capitalized debt issuance costs and fees during the three months ended September 30, 2022, which was included in selling, general and administrative expenses on the Consolidated Statements of Income (Loss). The Company incurred $1.6 million in financing costs for the New Credit Agreement, of which $0.2 million of third party costs were expensed and included in selling, general and administrative expenses on the Consolidated Statements of Income (Loss). As of December 31, 2022, the Company had borrowings of $186.6 million and a total of $3.0 million of letters of credit outstanding under the New Credit Agreement. The Company has capitalized costs associated with debt modifications of $1.4 million as of December 31, 2022, which is included in Other assets on the Consolidated Balance Sheet and will be amortized into interest expense over the remaining term of the Credit Agreement through July 30, 2027. As of December 31, 2022, the Company was in compliance with the terms of the New Credit Agreement. The Company continuously monitors compliance with the covenants contained in the New Credit Agreement. The Company believes that it is probable that the Company will be able to comply with the financial covenants in the New Credit Agreement and that sufficient credit remains available under the New Credit Agreement to meet the Company's liquidity needs. However, such matters cannot be predicted with certainty. Other Debt The Company's other debt includes bank financing provided at the local subsidiary level used to support working capital requirements and fund capital expenditures. At December 31, 2022, there was an aggregate of approximately $4.6 million outstanding, payable at various times through 2030. Monthly payments ran ge from $1 thousand to $15 thousand and interest rates range from 0.4% to 3.5%. Scheduled principal payments due under all borrowing agreements in each of the five years and thereafter subsequent to December 31, 2022 are as follows (in thousands): 2023 $ 7,526 2024 9,711 2025 11,623 2026 12,864 2027 148,728 Thereafter 799 Total $ 191,251

Fair Value Measurements

Fair Value Measurements	12 Months Ended
	Dec. 31, 2022
Fair Value Disclosures [Abstract]
Fair Value Measurements	Fair Value Measurements The Company performs fair value measurements in accordance with the guidance provided by ASC 820, Fair Value Measurements and Disclosures . ASC 820 defines fair value as the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date. It also establishes a three level hierarchy that prioritizes the inputs used to measure fair value. The three levels of the hierarchy are defined as follows: Level 1 — Inputs are unadjusted quoted prices in active markets for identical assets or liabilities that the Company has the ability to access at the measurement date. Level 2 — Observable inputs other than quoted prices included in Level 1, including quoted prices for similar assets or liabilities in active markets, quoted prices for identical assets or liabilities in inactive markets, inputs other than quoted prices that are observable for the asset or liability and inputs derived principally from or corroborated by observable market data. Level 3 — Unobservable inputs reflecting the Company’s own assumptions about inputs that market participants would use in pricing the asset or liability based on the best information available. Financial instruments measured at fair value on a recurring basis The fair value of contingent consideration liabilities was estimated using a discounted cash flow technique with significant inputs that are not observable in the market and thus represents a Level 3 fair value measurement as defined in ASC 820. The significant inputs in the Level 3 measurement not supported by market activity include the probability assessments of expected future cash flows related to the acquisitions, appropriately discounted considering the uncertainties associated with the obligation, and as calculated in accordance with the terms of the applicable acquisition agreements. The following table represents the changes in the fair value of Level 3 contingent consideration (in thousands): December 31, 2022 2021 Balance at the beginning of the period: $ 1,830 $ 1,640 Acquisitions — — Payments (938) (938) Accretion of liability — — Revaluation 45 1,128 Foreign currency translation — — Balance at the end of the period: $ 937 $ 1,830 Financial instruments not measured at fair value on a recurring basis The Company has evaluated current market conditions and borrower credit quality and has determined that the carrying value of its long-term debt approximates fair value. The fair value of the Company’s notes payable and finance lease obligations approximates their carrying amounts based on anticipated interest rates which management believes would currently be available to the Company for similar issuances of debt.

Share-Based Compensation

Share-Based Compensation	12 Months Ended
	Dec. 31, 2022
Share-Based Payment Arrangement [Abstract]
Share-Based Compensation	Share-Based Compensation The Company grants share-based incentive awards to its eligible employees and non-employee directors under two equity incentive plans: (i) the 2009 Long-Term Incentive Plan (the "2009 Plan") and (ii) the 2016 Long-Term Incentive Plan (the "2016 Plan"). No further awards may be granted under the 2009 Plan, and the remaining stock option award granted under the 2009 Plan expired during the three months ended March 31, 2022. Awards granted under the 2016 Plan may be in the form of stock options, restricted stock units and other forms of share-based incentives, including performance restricted stock units, stock appreciation rights and deferred stock rights. At the annual stockholders meeting on May 23, 2022, the Company’s stockholders approved an amendment to increase the total number of shares that may be issued under the 2016 Plan by 1.2 million, for a total of 4.9 million shares that are authorized for issuance under the 2016 plan, of which approximately 1,900,000 shares were available for future grants as of December 31, 2022. Stock Options For each of the years ended December 31, 2022, 2021 and 2020, the Company did not recognize any share-based compensation expense related to the stock option award, as the one outstanding stock option award was already fully vested. No unrecognized compensation costs remained related to the stock option awards. In addition, there were no stock options exercised during the years ended December 31, 2022, 2021 and 2020. The following table sets forth a summary of the stock option activity, weighted-average exercise prices and options outstanding as of December 31, 2022, 2021 and 2020 as follows (in thousands, except per share amounts and years): For the years ended December 31, 2022 2021 2020 Common Weighted Common Stock Options Weighted Average Exercise Price Common Weighted Outstanding at beginning of year: 5 $ 22.35 5 $ 22.35 5 $ 22.35 Granted — $ — — $ — — $ — Exercised — $ — — $ — — $ — Expired or forfeited (5) $ 22.35 — $ — — $ — Outstanding at end of year: — $ — 5 $ 22.35 5 $ 22.35 Restricted Stock Unit Awards Restricted Stock Units generally vest ratably on each of the first four A summary of the vesting activity of restricted stock unit awards, with the respective fair value of the awards, is as follows (in thousands): For the year ended December 31, 2022 2021 2020 Restricted stock awards vested 401 317 208 Fair value of awards vested $ 2,524 $ 3,434 $ 837 A summary of the fully-vested common stock the Company issued to its six non-employee directors, in connection with its non-employee director compensation plan, is as follows (in thousands): For the year ended December 31, 2022 2021 2020 Awards issued 70 51 68 Grant date fair value of awards issued $ 450 $ 525 $ 326 A summary of the Company's outstanding, non-vested restricted share units is as follows (in thousands, except per share amounts and years): For the year ended December 31, 2022 2021 2020 Units Weighted Units Weighted Units Weighted Outstanding at beginning of period: 1,208 $ 7.96 1,076 $ 7.41 559 $ 16.92 Granted 687 $ 7.59 528 $ 10.07 782 $ 3.79 Released (401) $ 6.63 (317) $ 10.77 (208) $ 18.71 Forfeited (79) $ 14.23 (79) $ 8.82 (57) $ 9.62 Outstanding at end of period: 1,415 $ 6.66 1,208 $ 7.96 1,076 $ 7.41 Performance Restricted Stock Units The Company maintains Performance Restricted Stock Units (PRSUs) that have been granted to select executives and senior officers whose ultimate payout is based on the Company’s performance over a one-year period based on specific metrics approved by the Compensation Committee of the Board of Directors of the Company. For 2021, the Compensation Committee made changes to the Company’s equity incentive compensation plan for its executive officers and approved the new target awards for 2021. For 2021, the three metrics were: 1. Free Cash Flow net cash provided by operating activities less purchases of property, plant, equipment and intangible assets and is subject to adjustments approved by the Compensation Committee. 2. Adjusted EBITDA defined as net income attributable to the Company plus: interest expense, provision for income taxes, depreciation and amortization, share-based compensation expense and certain acquisition related costs (including transaction due diligence costs and adjustments to the fair value of contingent consideration), foreign exchange (gain) loss and, if applicable, certain special items which are noted). 3. Total Shareholder Return (TSR) measures the total return to shareholders of the Company during 2021 versus the total return to the shareholders of a predefined peer group of companies that provide inspection, testing, certification or similar industrial services. The return will be measured by the year over year percent change in share price. The share prices used to calculate the return are the average share price during the 20-trading day period ending on the initial measurement date (the last 20 trading days of 2020), compared to the average share price during the 20-trading day period ending on the final measurement date (the last 20 trading days of 2021). Any cash dividends or distributions paid in 2021 will be added to calculate the return to shareholders during the year. TSR is considered a market condition for which the fair value of PRSUs with this condition is determined using a Monte Carlo valuation model. Key assumptions in the Monte Carlo valuation model included: a. Expected Volatility. Expected volatility of the Company’s common stock at the date of grant was estimated based on a historical average volatility rate for the approximate 1-year performance period. b. Dividend Yield . The dividend yield assumption was based on historical and anticipated dividend payouts (assumed at zero). c. Risk-Free Interest Rate . The risk-free interest rate assumption was based on observed interest rates consistent with the approximate 1-year performance measurement period. For 2022, the Compensation Committee retained the Company’s prior year equity incentive compensation plan for its executive officers including utilizing the same metrics, as defined above, and approved the new target awards for 2022. PRSUs are equity-classified and compensation costs are initially measured using the fair value of the underlying stock at the date of grant. Compensation costs related to the PRSUs are subsequently adjusted for changes in the expected outcomes of the performance conditions. Compensation cost related to the PRSUs with a market condition is not reversed if the market condition is not achieved, provided the employee requisite service has been rendered. PRSUs generally vest ratably on each of the first four A summary of the Company's PRSU activity is presented as follows (in thousands, except per share amounts and years): For the year ended December 31, 2022 2021 2020 Units Weighted Units Weighted Units Weighted Outstanding at beginning of period: 388 $ 10.07 333 $ 8.84 260 $ 16.77 Granted 341 $ 6.55 189 $ 12.59 292 $ 3.68 Performance condition adjustments, net (376) $ 7.71 (56) $ 9.27 (99) $ 3.82 Released (73) $ 5.17 (78) $ 8.15 (120) $ 17.29 Forfeited — $ — — $ — — $ — Outstanding at end of period: 280 $ 9.96 388 $ 10.07 333 $ 8.84 For the year ended December 31, 2022, 341,000 PRSUs were granted. There was a 376,000 net unit reduction to these awards, which represents Company performance below target, during the year ended December 31, 2022. For the year ended December 31, 2021, 189,000 PRSUs were granted. There was a 56,000 unit reduction to these awards, which represents Company performance against target, during the year ended December 31, 2021. For the year ended December 31, 2020, 292,000 PRSUs were granted. There was a 99,000 unit reduction to these awards, which represents Company performance against target, (including an increase of 1,000 units due to the Compensation Committee approving the final calculation of the award metrics for calendar year 2019), during the year ended December 31, 2020. Compensation expense related to all PRSUs described above was $1.2 million, $1.4 million, and $1.2 million for the years ended December 31, 2022, 2021 and 2020, respectively. At December 31, 2022, there was $1.2 million of total unrecognized compensation costs related to approximately 280,000 unvested performance restricted stock units. These costs are expected to be recognized over a weighted-average period of approximately 1.3 years.

Income Taxes

Income Taxes	12 Months Ended
	Dec. 31, 2022
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes Income (loss) before provision (benefit) for income taxes is as follows (in thousands): For the year ended December 31, 2022 2021 2020 Income (loss) before provision (benefit) for income taxes from: U.S. operations $ 439 $ 1,527 $ (54,190) Foreign operations 8,855 5,761 (59,982) Income (loss) before provision (benefit) for income taxes $ 9,294 $ 7,288 $ (114,172) The provision (benefit) for income taxes consists of the following (in thousands): For the year ended December 31, 2022 2021 2020 Current Federal $ (644) $ (182) $ (6,278) States and local 464 246 528 Foreign 3,251 3,641 4,006 Reserve for uncertain tax positions 136 (186) (28) Total current provision (benefit) 3,207 3,519 (1,772) Deferred Federal (435) (309) (2,781) States and local 242 (138) (1,244) Foreign (1,614) (1,884) (10,045) Reserve for uncertain tax positions — 155 — Total deferred benefit (1,807) (2,176) (14,070) Net change in valuation allowance 1,320 2,052 1,136 Net deferred benefit (487) (124) (12,934) Total provision (benefit) for income taxes $ 2,720 $ 3,395 $ (14,706) The provision (benefit) for income taxes differs from the amount computed by applying the statutory federal tax rate to income tax as follows (in thousands): For the years ended December 31, 2022 2021 2020 Federal tax at statutory rate $ 1,952 21.0 % $ 1,527 21.0 % $ (23,976) 21.0 % State taxes, net of federal benefit 622 6.7 % 75 1.0 % (1,175) 1.0 % Foreign tax 218 2.3 % 380 5.2 % (815) 0.7 % Goodwill impairment — — % — — % 10,003 (8.8) % Nondeductible compensation — — % 119 1.6 % 975 (0.9) % US taxation of foreign earnings 100 1.1 % (1,041) (14.3) % 56 — % Permanent differences 363 3.9 % 373 5.1 % 944 (0.8) % Research and Development Credit (1,716) (18.5) % (214) 2.9 % (236) 0.2 % Federal loss carryback — — % — — % (1,938) 1.7 % Change in valuation allowance 1,320 14.2 % 2,052 28.2 % 1,136 (1.0) % Impact of foreign tax rate changes (246) (2.6) % 49 0.7 % 392 (0.3) % Other 107 1.2 % 75 1.0 % (72) 0.1 % Total provision (benefit) for income taxes $ 2,720 29.3 % $ 3,395 52.4 % $ (14,706) 12.9 % The permanent differences identified above include normal recurring differences, such as meals, entertainment, and parking fringe benefits as well as a portion of the goodwill impairment charge. On June 28, 2019, the Canadian province of Alberta enacted the Job Creation Tax Cut which reduced the Alberta corporate income tax rate from 12% to 11% starting in 2019 with further annual reductions to 10% in 2020, 9% in 2021, and 8% in 2022. This rate reduction had a favorable impact of approximately $1.9 million on the Company’s net deferred tax liabilities in this jurisdiction in 2019. As part of Alberta’s Recovery plan associated with the COVID-19 pandemic, Alberta accelerated the decrease in income tax rates from 10% in 2020 to 8% effective July 1, 2020. The accelerated tax rate reduction did not have a material impact on the Company’s net deferred tax liabilities but did reduce current taxes. On March 27, 2020, the United States enacted the Coronavirus Aid, Relief, and Economic Security Act (CARES Act). The CARES Act is an approximately $2 trillion emergency economic stimulus package in response to the Coronavirus outbreak, which among other things contains numerous income tax provisions. Some of these tax provisions are effective retroactively for years ending before the date of enactment. The CARES Act provides a five-year carryback of net operating losses generated in years 2018 through 2020. As the statutory federal income tax rate applicable to certain years within the carryback period is 35%, carryback to those years of our estimated 2020 annual federal tax loss provides a tax benefit in excess of the current federal statutory rate of 21%, resulting in an increased income tax benefit of $1.9 million. The income tax effects of the CARES Act resulted in a cash refund of approximately $4.9 million in 2021 of taxes paid in prior years. On December 27, 2020, the United States enacted the Consolidated Appropriations Act, 2021, (the "Appropriations Act") an additional stimulus package providing financial relief for individuals and small business. The Appropriations Act contains a variety of tax provisions, including full expensing of business meals in 2021 and 2022, and expansion of the employee retention tax credit. The Appropriations Act did not have a material impact on our consolidated financial position, results of operations, and cash flows . In response to the COVID-19 pandemic, the American Rescue Plan Act was signed into law on March 11, 2021. This act, among other things, provides economic relief provisions to individuals and funding to certain businesses and programs. This guidance did not have a material impact on our consolidated financial position, results of operations, and cash flows. In August 2022 the United States enacted the Inflation Reduction Act (“IRA”) of 2022 (Public Law No. 117-169), which includes a 15% book minimum tax on corporations with financial accounting profits over 1 billion US dollars (USD) and a 1% excise tax on certain stock buybacks. The IRA also contains numerous clean energy tax incentives related to electricity production, carbon sequestration, alternative vehicles and fuels, and residential and commercial energy efficiency. The company does not expect this act to have a material impact. Deferred income tax attributes resulting from differences between financial accounting amounts and income tax basis of assets and liabilities are as follows (in thousands): December 31, 2022 2021 Deferred income tax assets Allowance for doubtful accounts $ 826 $ 677 Inventory 806 567 Intangible assets 1,178 1,733 Accrued expenses 4,365 5,662 Net operating loss carryforward 4,985 6,303 Finance lease obligations 463 741 Deferred stock based compensation 1,152 996 Interest carryforward 1,501 618 Right-of-use liability 9,886 10,786 R&D Expense 2,836 — Credits 490 409 Other 1,495 1,353 Deferred income tax assets 29,983 29,845 Valuation allowance (7,787) (6,340) Net deferred income tax assets 22,196 23,505 Deferred income tax liabilities Property and equipment (6,493) (8,157) Goodwill (7,645) (5,819) Intangible assets (3,601) (4,935) Right-of-use asset (9,841) (10,738) Other (122) (67) Deferred income tax liabilities (27,702) (29,716) Net deferred income taxes (5,506) (6,211) As of December 31, 2022, the Company had no federal net operating loss carry forwards (NOLs). In addition, as of December 31, 2022, the Company had state and foreign NOLs of $20.6 million and $14.1 million, respectively. Approximately $6.6 million of the state NOLs expire at various times from 2031 to 2040, while the remainder of the Company's state NOLs do not expire. Approximately $1.8 million of the foreign NOLs expire at various times from 2023 to 2041, while the remainder of the Company's foreign NOLs do not expire. In assessing the ability to realize deferred tax assets, management considers whether it is more likely than not that some portion or all of the deferred tax assets will be realized. Valuation allowances are provided when management believes the Company's deferred tax assets are not recoverable based on future reversals of existing taxable temporary differences, taxable income in prior carryback year(s) if carryback is permitted under the tax law, and an assessment of estimated future taxable income, exclusive of reversing temporary differences and carryforwards, that incorporates ongoing, prudent and feasible tax planning strategies. At December 31, 2022 and December 31, 2021, the Company has a valuation allowance of approximately $7.8 million and $6.3 million, respectively, primarily against certain state and foreign NOLs and other specific deferred tax assets. The net increase in the valuation allowance of approximately $0.1 million is primarily attributable to state and foreign net operating losses and changes in foreign exchange rates, offset by a reduction of expiring losses. Except for those deferred tax assets subject to the valuation allowance, management believes that it will realize all deferred tax assets as a result of sufficient future taxable income in each tax jurisdiction in which the Company has deferred tax assets. . The following table summarizes the changes in the Company’s gross unrecognized tax benefits, excluding interest and penalties (in thousands): For the year ended December 31, 2022 2021 Balance at beginning of period $ 300 $ 347 Additions for tax positions related to the current fiscal period — 155 Additions for tax positions related to prior years 1 1 Reductions related to the expiration of statutes of limitations (43) (203) Balance at end of period $ 258 $ 300 The Company has recorded the unrecognized tax benefits in other long-term liabilities in the consolidated balance sheets. As of December 31, 2022 and December 31, 2021, there were approximately $0.3 million and $0.3 million of unrecognized tax benefits, respectively, including penalties and interest. If the Company recognized these unrecognized tax benefits, approximately $0.3 million and $0.3 million would favorably affect the effective tax rate for both December 31, 2022 and December 31, 2021, respectively. Interest and penalties related to unrecognized tax benefits are recorded in income tax expense and are not significant for the years ended December 31, 2022, 2021 and 2020. The Company anticipates a decrease to its unrecognized tax benefits of $0.1 million excluding interest and penalties within the next 12 months. The Company is subject to taxation in the United States and various states and foreign jurisdictions. The Company is no longer subject to U.S. federal income tax examinations for years ending before December 31, 2017 and generally is no longer subject to state, local or foreign income tax examinations by tax authorities for years ending before December 31, 2016. Net income (loss) of foreign subsidiaries was $5.8 million, $3.7 million, and $(55.7) million for the years ended December 31, 2022, 2021 and 2020, respectively. Generally, it has been the Company's practice and intention to reinvest the earnings of its non-U.S. subsidiaries in those operations. As previously noted, the Tax Act made significant changes to the taxation of undistributed earnings, requiring that all previously untaxed earnings and profits of the Company's controlled foreign operations be subjected to the transition tax. Since these earnings have now been subjected to U.S. federal tax, they would only be potentially subject to limited other taxes, including foreign withholding and certain state taxes. As of December 31, 2022, the Company has not recognized a deferred tax liability for foreign withholdings and state taxes on its undistributed international earnings or losses of its foreign subsidiaries since it intends to indefinitely reinvest the earnings outside the United States. The Company has estimated that the amount of the unrecorded deferred tax liability related to undistributed international earnings is approximately $1.8 million.

Employee Benefit Plans

Employee Benefit Plans	12 Months Ended
	Dec. 31, 2022
Retirement Benefits [Abstract]
Employee Benefit Plans	Employee Benefit Plans The Company provides a 401(k) savings plan for eligible U.S. based employees. Employee contributions are discretionary up to the IRS limits each year and catch up contributions are allowed for employees 50 years of age or older. Under the 401(k) plan, employees become eligible to participate on the first day of the month after three months of continuous service. Under this plan, the Company matches 50% of the employee’s contributions up to 4% of the employee’s annual compensation, as defined by the plan. There is a five-year vesting schedule for the Company match. During the third quarter of 2021, the Company re-installed the employer match which was previously suspended as part of the Company's cost reduction initiatives undertaken in 2020 due to the COVID-19 pandemic. The Company’s contribution to the plan was $3.0 million, $1.2 million, and $1.1 million for the years ended December 31, 2022, 2021 and 2020, respectively. The Company's subsidiary participated with other employers in contributing to the Boilermaker-Blacksmith National Pension Trust (EIN 48-6168020) (“Boilermakers”) and Plumbers and Pipefitters National Pension Fund (EIN 52-6152779) (“Pipefitters”), multi-employer defined benefit pension plans, which covers certain U.S. based union employees. The plans provide multiple plan benefits with corresponding contribution rates that are collectively bargained between participating employers and their affiliated Boilermakers and Pipefitters local unions. Both the Boilermakers and Pipefitters plans are approximately 70 percent funded as of the latest Form 5500 filed, respectively. The Company did not make any contributions to the Boilermakers during the years ended December 31, 2022 and 2021 while making de minimis contributions to the Pipefitters plan during the same periods. See Note 18-Commitments and Contingencies, Pension Related Contingencies, for additional detail. The Company has other benefit plans covering certain employees throughout the Company. Amounts charged to expense under these plans were not significant in any year.

Related Party Transactions

Related Party Transactions	12 Months Ended
	Dec. 31, 2022
Related Party Transactions [Abstract]
Related Party Transactions	Related Party Transactions The Company leases its headquarters under an operating lease from a stockholder and director of the Company. On August 1, 2014, the Company extended its lease at its headquarters requiring monthly payments through October 2024. Total rent payments made during the year ended December 31, 2022 were approximately $1.0 million. See Note 17-Leases for further detail.

Leases

Leases	12 Months Ended
	Dec. 31, 2022
Leases [Abstract]
Leases	Leases The Company leases certain office and operating facilities, machinery, equipment, and vehicles. Concurrent with the adoption of ASC 842, the Company recognized a right-of-use (ROU) asset and lease liability based on the present value of the future lease payments over the lease term for each lease agreement. The Company elected not to recognize a ROU asset and lease liability for leases with terms of 12 months or less and will continue to recognize lease expense for these leases on a straight-line basis over the lease term. The Company has leases with both lease components and non-lease components, such as common area maintenance, utilities, or other repairs and maintenance. For all asset classes, the Company decided to utilize the practical expedient to include both fixed lease components and fixed non-lease components in calculating the ROU asset and lease liability. The Company identified variable lease payments, such as maintenance payments based on actual activities performed or costs incurred, at lease commencement by assessing the nature of the payment provisions, including whether the payments are subject to a minimum charge. Many of the Company's leases include one or more options to renew. When it is reasonably certain that the Company will exercise the option, the Company will include the impact of the option in the lease term for purposes of determining future lease payments. As the Company is unable to determine the discount rate implicit in its lease agreements, the Company uses its incremental borrowing rate on the commencement date to calculate the present value of future payments. The Company’s Consolidated Balance Sheets include the following related to operating leases as of December 31, 2022 and 2021 (in thousands): Leases Classification 2022 2021 Assets: ROU assets Other Assets $ 36,946 $ 42,451 Liabilities: ROU liability - current Accrued expenses and other current liabilities $ 10,376 $ 10,040 ROU liability - long-term Other long-term liabilities 28,066 34,030 Total ROU liabilities $ 38,442 $ 44,070 Included within the balance of operating leases is a lease for the Company’s headquarters which is with a related party. The ROU liability for this facility is approximately $1.8 million as of December 31, 2022 and $2.9 million as of December 31, 2021. Total rent payments for this facility were approximately $1.0 million and $1.3 million during the years ended December 31, 2022 and 2021. An agreement was reached with the related party to reduce rental payments by 12.5% for the lease of the Company’s headquarters, effective February 2022 as part of a voluntary reduction. As of December 31, 2022 and 2021, the total ROU assets attributable to finance leases are approximately $13.0 million and $13.8 million, respectively, which is included in Property, plant, and equipment, net on the Consolidated Balance Sheets. The components of lease costs for the year ended December 31, 2022 and 2021 are as follows (in thousands): Classification 2022 2021 Finance lease expense: Amortization of ROU assets Depreciation and amortization $ 4,068 $ 4,111 Interest on lease liabilities Interest expense 624 721 Operating lease expense Cost of revenue; Selling, general & administrative expenses 12,783 13,042 Short-term lease expense Cost of revenue; Selling, general & administrative expenses 77 27 Variable lease expense Cost of revenue; Selling, general & administrative expenses 2,141 2,507 Total $ 19,693 $ 20,408 Additional information related to leases as of December 31, 2022 and 2021 is as follows: 2022 2021 Cash paid for amounts included in the measurement of lease liabilities for finance and operating leases (in thousands): Finance - financing cash flows $ 4,140 $ 4,060 Finance - operating cash flows 624 721 Operating - operating cash flows 12,502 13,098 ROU assets obtained in the exchange for lease liabilities: Finance leases $ 5,076 2,923 Operating leases 6,067 7,021 Weighted-average remaining lease term (in years): Finance leases 5.1 5.4 Operating leases 4.7 5.3 Weighted-average discount rate: Finance leases 5.5 % 5.3 % Operating leases 5.6 % 5.7 % Maturities of lease liabilities as of December 31, 2022 is as follows (in thousands): Finance Operating 2023 $ 6,131 $ 12,109 2024 3,970 9,869 2025 2,448 7,304 2026 1,747 5,272 2027 842 4,119 Thereafter 255 5,089 Total 15,393 43,762 Less: Present value discount 1,147 5,320 Lease liability $ 14,246 $ 38,442
Leases	Leases The Company leases certain office and operating facilities, machinery, equipment, and vehicles. Concurrent with the adoption of ASC 842, the Company recognized a right-of-use (ROU) asset and lease liability based on the present value of the future lease payments over the lease term for each lease agreement. The Company elected not to recognize a ROU asset and lease liability for leases with terms of 12 months or less and will continue to recognize lease expense for these leases on a straight-line basis over the lease term. The Company has leases with both lease components and non-lease components, such as common area maintenance, utilities, or other repairs and maintenance. For all asset classes, the Company decided to utilize the practical expedient to include both fixed lease components and fixed non-lease components in calculating the ROU asset and lease liability. The Company identified variable lease payments, such as maintenance payments based on actual activities performed or costs incurred, at lease commencement by assessing the nature of the payment provisions, including whether the payments are subject to a minimum charge. Many of the Company's leases include one or more options to renew. When it is reasonably certain that the Company will exercise the option, the Company will include the impact of the option in the lease term for purposes of determining future lease payments. As the Company is unable to determine the discount rate implicit in its lease agreements, the Company uses its incremental borrowing rate on the commencement date to calculate the present value of future payments. The Company’s Consolidated Balance Sheets include the following related to operating leases as of December 31, 2022 and 2021 (in thousands): Leases Classification 2022 2021 Assets: ROU assets Other Assets $ 36,946 $ 42,451 Liabilities: ROU liability - current Accrued expenses and other current liabilities $ 10,376 $ 10,040 ROU liability - long-term Other long-term liabilities 28,066 34,030 Total ROU liabilities $ 38,442 $ 44,070 Included within the balance of operating leases is a lease for the Company’s headquarters which is with a related party. The ROU liability for this facility is approximately $1.8 million as of December 31, 2022 and $2.9 million as of December 31, 2021. Total rent payments for this facility were approximately $1.0 million and $1.3 million during the years ended December 31, 2022 and 2021. An agreement was reached with the related party to reduce rental payments by 12.5% for the lease of the Company’s headquarters, effective February 2022 as part of a voluntary reduction. As of December 31, 2022 and 2021, the total ROU assets attributable to finance leases are approximately $13.0 million and $13.8 million, respectively, which is included in Property, plant, and equipment, net on the Consolidated Balance Sheets. The components of lease costs for the year ended December 31, 2022 and 2021 are as follows (in thousands): Classification 2022 2021 Finance lease expense: Amortization of ROU assets Depreciation and amortization $ 4,068 $ 4,111 Interest on lease liabilities Interest expense 624 721 Operating lease expense Cost of revenue; Selling, general & administrative expenses 12,783 13,042 Short-term lease expense Cost of revenue; Selling, general & administrative expenses 77 27 Variable lease expense Cost of revenue; Selling, general & administrative expenses 2,141 2,507 Total $ 19,693 $ 20,408 Additional information related to leases as of December 31, 2022 and 2021 is as follows: 2022 2021 Cash paid for amounts included in the measurement of lease liabilities for finance and operating leases (in thousands): Finance - financing cash flows $ 4,140 $ 4,060 Finance - operating cash flows 624 721 Operating - operating cash flows 12,502 13,098 ROU assets obtained in the exchange for lease liabilities: Finance leases $ 5,076 2,923 Operating leases 6,067 7,021 Weighted-average remaining lease term (in years): Finance leases 5.1 5.4 Operating leases 4.7 5.3 Weighted-average discount rate: Finance leases 5.5 % 5.3 % Operating leases 5.6 % 5.7 % Maturities of lease liabilities as of December 31, 2022 is as follows (in thousands): Finance Operating 2023 $ 6,131 $ 12,109 2024 3,970 9,869 2025 2,448 7,304 2026 1,747 5,272 2027 842 4,119 Thereafter 255 5,089 Total 15,393 43,762 Less: Present value discount 1,147 5,320 Lease liability $ 14,246 $ 38,442

Commitments and Contingencies

Commitments and Contingencies	12 Months Ended
	Dec. 31, 2022
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Commitments and Contingencies Legal Proceedings and Government Investigations The Company is periodically involved in lawsuits, investigations and claims that arise in the ordinary course of business. The Company cannot predict with certainty the ultimate resolution of lawsuits, investigations and claims asserted against it. Except for possible losses from the matters described below, the Company does not believe that any currently pending or threatened legal proceeding to which the Company is or is likely to become a party will have a material adverse effect on its business, results of operations, cash flows or financial condition. The costs incurred by the Company to defend lawsuits, investigations and claims and amounts the Company pays to other parties because of these matters may be covered by insurance in some circumstances. Litigation and Commercial Claims The Company was contracted to perform inspections of welds on various pipeline projects in Texas for a customer. As of December 31, 2022 approximately $1.4 million of past due receivables were outstanding from this customer. The customer provided the Company with notice in December 2019, alleging that the Company’s inspection of 66 welds (out of approximately 16,000 welds inspected) were not in compliance with the contract, claimed approximately $7.6 million in damages, and requested that the Company pay these damages and any other damages incurred. The Company filed a lawsuit in the District Court of Bexar County, Texas, 37th Judicial District, on December 17, 2019, in an action captioned Mistras Group, Inc. v. Epic Y-Grade Pipeline LP, to recover the $1.4 million and other amounts due to the Company. The customer filed a counterclaim on March 6, 2020, alleging breach of contract and seeking recovery of its alleged damages. The Company believes that any successful claim by the customer regarding the Company’s workmanship will be covered by insurance, subject to payment of a deductible. At this time, the Company is unable to determine whether it has any liability in connection with this matter and if so, the amount or range of any such liability. In the year ended December 31, 2022, the Company recorded a charge of $0.1 million for a potential loss from this matter. The Company recorded a reserve in the amount of $1.4 million during the twelve months ended December 31, 2019 for these past due receivables. Two proceedings have been filed in California Superior Court for the County of Los Angeles regarding alleged violations of the California Labor Code. Both cases are captioned Justin Price v. Mistras Group, Inc., one being a purported class action lawsuit on behalf of current and former Mistras employees in California, filed on June 10, 2020, and the other was filed on September 18, 2020, behalf of the State of California under the California Private Attorney General Act on the basis of the same alleged violations. The two cases was consolidated and requested payment of all damages, including unpaid wages, and various fines and penalties available under California law. On May 4, 2021, the Company agreed to a settlement of all claims in the cases, which was more formally documented pursuant to a settlement agreement completed October 5, 2021, as amended as of May 3, 2022. Pursuant to the settlement, the Company agreed to pay $2.3 million to resolve the allegations in these proceedings and to be responsible for the employer portion of payroll taxes on the amount of the settlement allocated to wages. The settlement as agreed upon by the parties received final court approval on September 26, 2022, and the Company paid the settlement proceeds and related payroll taxes to the claims administrator in the fourth quarter of 2022. The Company recorded expense of approximately $1.6 million during the three months ended March 31, 2021 related to this settlement, which is in addition to expense of $0.8 million the Company recorded during the three months ended December 31, 2020. Pension Related Contingencies Certain of Company’s subsidiaries had significant reductions in their unionized workers in 2018. The collective bargaining agreements for the employees of this subsidiary required contributions for these employees to two national multi-employer pension funds. The reduction in employees resulted in the subsidiary incurring a complete withdrawal to one of the pension funds under the Employee Retirement Income Security Act of 1974 ("ERISA"), which was fully satisfied in 2019. The Company has determined that the subsidiary is likely to incur partial or complete withdrawal liability to the other pension fund. The balance of the estimated total amount of this potential liability as of December 31, 2022 is approximately $2.5 million, which was incurred in 2018 and 2019. Severance and labor disputes During December 2019, the Company executed an agreement to sell the rights of certain customer "staff leasing" contracts related to its German subsidiary for total consideration of approximately $0.1 million, effective January 1, 2020. No other assets or liabilities other than those employee benefits related to employees working on the customer contracts were included in the sale. As of December 31, 2022, the Company has approximately $0.1 million of accrued estimated severance payment obligations, which takes into account the Company's estimate with respect to the employees that have been or will be transitioned to the German subsidiaries' other customers. The $0.1 million of estimated obligations is net of $0.4 million in payments made and $1.0 million in reversals due to employees being transitioned to customer contracts. The Company was entitled to indemnification on certain labor claims from the sellers of a company acquired by its Brazilian subsidiary. The Company and the sellers entered into a settlement agreement for approximately $1.0 million, which provided for payment in two installments, the first for approximately 31% of the settlement and the second for the remaining 69%. The first installment in the amount of approximately $0.3 million was paid by the sellers in December 2020 and the Company recognized that amount as a gain in selling, general and administrative expenses in the same period. The remaining payment for $0.6 million was received in the first quarter of 2021 and the Company recognized that amount as a gain in selling, general and administrative expenses in the same period. Acquisition and disposition related contingencies The Company is liable for contingent consideration in connection with certain of its acquisitions. As of December 31, 2022, total potential acquisition-related contingent consideration ranged from zero to approximately $0.9 million. During 2018, the Company sold a subsidiary in the Products and Systems segment. As part of the sale, the Company entered into a three-year agreement to purchase products from the buyer, with a cumulative commitment of $2.3 million. On August 3, 2021, the parties amended the agreement and extended the period by 12 months . As of December 31, 2022, the commitment was fully satisfied.

Segment Disclosure

Segment Disclosure	12 Months Ended
	Dec. 31, 2022
Segment Reporting [Abstract]
Segment Disclosure	Segment Disclosure The Company’s three operating segments are: • Services. This segment provides asset protection solutions predominantly in North America, with the largest concentration in the United States, followed by Canada, consisting primarily of NDT, inspection, mechanical and engineering services that are used to evaluate the safety, structural integrity and reliability of critical energy, industrial and public infrastructure and commercial aerospace components. Software, digital and data services are included in this segment. • International. This segment offers services, products and systems, similar to those of the other segments, to select markets within Europe, the Middle East, Africa, Asia and South America, but not to customers in China and South Korea, which are served by the Products and Systems segment. • Products and Systems. This segment designs, manufactures, sells, installs and services the Company’s asset protection products and systems, including equipment and instrumentation, predominantly in the United States. Costs incurred for general corporate services, including finance, legal, and certain other costs that are provided to the segments are reported within Corporate and eliminations. Sales to the International segment from the Products and Systems segment and subsequent sales by the International segment of the same items are recorded and reflected in the operating performance of both segments. Additionally, engineering charges and royalty fees charged to the Services and International segments by the Products and Systems segment are reflected in the operating performance of each segment. The accounting policies of the reportable segments are the same as those described in Note 1-Summary of Significant Accounting Policies and Practices . Segment income from operations is one of the primary performance measures used by the chief operating decision maker, to assess the performance of each segment and make resource allocation decisions. Certain general and administrative costs such as human resources, information technology and training are allocated to the segments. Segment income from operations excludes interest and other financial charges and income taxes. Corporate and other assets are comprised principally of cash, deposits, property, plant and equipment, domestic deferred taxes, deferred charges and other assets. Corporate loss from operations consists of administrative charges related to corporate personnel and other charges that cannot be readily identified for allocation to a particular segment. Selected consolidated financial information by segment for the periods shown was as follows (with intercompany transactions eliminated in Corporate and eliminations): For the year ended December 31, 2022 2021 2020 Revenue Services $ 573,336 $ 555,387 $ 476,164 International 112,425 117,245 107,556 Products and Systems 12,727 13,831 16,449 Corporate and eliminations (11,115) (9,332) (7,598) $ 687,373 $ 677,131 $ 592,571 For the year ended December 31, 2022 2021 2020 Gross profit Services $ 159,049 $ 155,384 $ 141,084 International 33,591 34,282 31,046 Products and Systems 5,490 7,001 6,826 Corporate and eliminations 43 480 (425) $ 198,173 $ 197,147 $ 178,531 Income (loss) from operations by operating segment includes intercompany transactions, which are eliminated in Corporate and eliminations . For the year ended December 31, 2022 2021 2020 Income (loss) from operations Services $ 49,616 $ 48,458 $ (44,222) International 3,566 1,839 (21,855) Products and Systems (992) (117) (936) Corporate and eliminations (32,391) (32,010) (34,204) $ 19,799 $ 18,170 $ (101,217) For the year ended December 31, 2022 2021 2020 Depreciation and amortization Services $ 25,103 $ 25,259 $ 26,093 International 7,648 8,791 8,659 Products and Systems 810 928 998 Corporate and eliminations (267) (57) (45) $ 33,294 $ 34,921 $ 35,705 December 31, 2022 2021 Intangible assets, net Services $ 43,260 $ 51,862 International 4,422 6,344 Products and Systems 1,208 1,042 Corporate and eliminations 125 133 $ 49,015 $ 59,381 December 31, 2022 2021 Total assets Services $ 407,779 $ 424,058 International 104,531 111,619 Products and Systems 12,408 10,532 Corporate and eliminations 10,186 15,986 $ 534,904 $ 562,195 December 31, 2022 2021 Long-lived assets United States $ 176,237 $ 183,052 Other Americas 108,582 120,012 Europe 41,392 48,334 $ 326,211 $ 351,398 Refer to Note 2-Revenue , for revenues by segment and by geographic area for the years ended December 31, 2022, 2021, and 2020.

Selected Quarterly Financial In

Selected Quarterly Financial Information (unaudited)	12 Months Ended
	Dec. 31, 2022
Quarterly Financial Information Disclosure [Abstract]
Selected Quarterly Financial Information (unaudited)	Selected Quarterly Financial Information (unaudited) The following is a summary of the quarterly results of operations for calendar years 2022, 2021, and 2020 (in thousands). Quarter ended December 31, 2022 September 30, 2022 June 30, 2022 March 31, 2022 Revenue $ 168,218 $ 178,462 $ 179,031 $ 161,662 Gross Profit 50,939 53,784 53,558 39,892 Income (loss) from operations 5,802 9,114 9,576 (4,698) Net income (loss) attributable to Mistras Group, Inc. $ 2,842 $ 4,373 $ 4,643 $ (5,363) Earnings (loss) per common share: Basic $ 0.09 $ 0.15 $ 0.15 $ (0.18) Diluted $ 0.09 $ 0.14 $ 0.15 $ (0.18) Quarter ended December 31, 2021 September 30, 2021 June 30, 2021 March 31, 2021 Revenues $ 171,163 $ 174,556 $ 177,677 $ 153,735 Gross Profit 49,594 52,216 55,336 40,001 Income (loss) from operations 2,306 9,236 11,374 (4,746) Net income (loss) attributable to Mistras Group, Inc. $ (94) $ 3,380 $ 5,937 $ (5,362) Earnings (loss) per common share: Basic $ 0.00 $ 0.11 $ 0.20 $ (0.18) Diluted $ 0.00 $ 0.11 $ 0.20 $ (0.18) Quarter ended December 31, 2020 September 30, 2020 June 30, 2020 March 31, 2020 Revenues $ 160,777 $ 147,894 $ 124,435 $ 159,465 Gross Profit 49,345 47,384 41,158 40,644 Income (loss) from operations 4,652 5,742 (383) (111,228) Net income (loss) attributable to Mistras Group, Inc. $ 181 $ 1,523 $ (2,656) $ (98,509) Earnings (loss) per common share: Basic $ 0.01 $ 0.05 $ (0.09) $ (3.40) Diluted $ 0.01 $ 0.05 $ (0.09) $ (3.40)

Summary of Significant Accoun_2

Summary of Significant Accounting Policies and Practices (Policies)	12 Months Ended
	Dec. 31, 2022
Accounting Policies [Abstract]
Principles of Consolidation	Principles of Consolidation The Company follows guidance on the consolidation of variable interest entities ("VIEs") that requires companies to utilize a qualitative approach to determine whether it is the primary beneficiary of a VIE. The process for identifying the primary beneficiary of a VIE requires consideration of the factors that indicate a party has the power to direct the activities that most significantly impact the VIE’s economic performance, including powers granted to the VIE’s program manager, powers contained in the VIE governing board and, to a certain extent, a company’s economic interest in the VIE. The Company analyzes its joint ventures and classifies them as either: • a VIE that must be consolidated because the Company is the primary beneficiary, or the joint venture is not a VIE and the Company holds the majority voting interest with no significant participative rights available to the other partners; or • a VIE that does not require consolidation and is treated as an equity method investment because the Company is not the primary beneficiary or the joint venture is not a VIE and the Company does not hold the majority voting interest. As part of the above analysis, if it is determined that the Company has the power to direct the activities that most significantly impact the joint venture’s economic performance, the Company considers whether or not it has the obligation to absorb losses or rights to receive benefits of the VIE that could potentially be significant to the VIE. The Company became the primary beneficiary in July 2020 of a VIE in which the Company has a 49% interest in a limited partnership, and a 49% shareholder in the corporate general partner of the limited partnership. The Company consolidated the financial statements of the VIE with the financial statements of the Company. As of and for the year ended December 31, 2022, the VIE had immaterial assets and had approximately $4.7 million revenue. The Company is the primary sub-contractor of the VIE. The accompanying audited consolidated financial statements include the accounts of Mistras Group, Inc. as well as its wholly-owned subsidiaries, majority-owned subsidiaries and consolidated VIE. For subsidiaries in which the Company’s ownership interest is less than 100%, the non-controlling interests are reported in stockholders’ equity in the accompanying Consolidated Balance Sheets. The non-controlling interests in net results, net of tax, is classified separately in the accompanying Consolidated Statements of Income (Loss). All significant intercompany accounts and transactions have been eliminated in consolidation. The results of operations of companies acquired are included from the date of acquisition.
Reclassifications	Reclassifications Certain amounts in prior periods have been reclassified to conform to the current year presentation. Such reclassifications did not have a material effect on the Company's financial condition or results of operations as previously reported.
Use of Estimates	Use of Estimates The preparation of financial statements in accordance with U.S. generally accepted accounting principles ("U.S. GAAP") requires that the Company make estimates and assumptions that affect the reported amounts of assets, liabilities, revenue and expenses and disclosure of contingent assets and liabilities at the date of the financial statements. The Company bases its estimates and assumptions on historical experience, known or expected trends and various other assumptions that it believes to be reasonable. As future events and their effects cannot be determined with precision, actual results could differ significantly from these estimates, which may cause the Company’s future results to be significantly affected.
Cash and Cash Equivalents	Cash and Cash Equivalents The Company considers all highly liquid investments purchased with an original maturity of three months or less to be cash equivalents.
Accounts Receivables and Allowance for Credit Losses	Accounts Receivable and Allowance for Credit Losses The Company maintains an allowance for credit losses on its accounts receivable balances, which represents its best estimate of current expected credit losses over the contractual life of the accounts receivable. When evaluating the adequacy of its allowance for credit losses each reporting period, the Company analyzes accounts receivable balances with similar risk characteristics on a collective basis, considering factors such as the aging of receivable balances, payment terms (primarily with 30 day terms), geographic location, historical loss experience, current information and future expectations (generally considered one year which is consistent with expected collectability of the Company's trade receivables).
Concentrations of Credit Risk	Concentration of Credit Risk For each of the years ended December 31, 2022 and 2021, no customer represented 10% or more of the Company's revenue.
Inventories	Inventories Inventories are stated at the lower of cost or net realizable value, as determined by using the first-in, first-out method, or market. Work in process and finished goods inventory include material, direct labor, variable costs and overhead.
Purchased and Internal-Use Software	Purchased and Internal-Use Software The Company capitalizes certain costs that are incurred to purchase or to create and implement internal-use software, which includes software coding, installation and testing. Capitalized costs are amortized on a straight-line basis over three years, the estimated useful life of the software.
Property, Plant and Equipment	Property, Plant and Equipment Property, plant and equipment are recorded at cost. Depreciation of property, plant and equipment is computed utilizing the straight-line method over the estimated useful lives of the assets. Amortization of leasehold improvements is computed utilizing the straight-line method over the shorter of the remaining lease term or estimated useful life. Repairs and maintenance costs are expensed as incurred.
Goodwill	Goodwill Goodwill represents the excess purchase price of acquired businesses over the fair values attributed to underlying net tangible assets and identifiable intangible assets. The Company tests goodwill for impairment at a “reporting unit” level (which for the Company is represented by (i) its Services segment, (ii) its Products and Systems segment, (iii) the European component of its International segment and (iv) the Brazilian component of its International segment). The Company's annual impairment test is conducted on the first day of the Company's fourth quarter, which is October 1. Goodwill is also tested for impairment whenever an event occurs or circumstances change that would more likely than not reduce the fair value of a reporting unit below its carrying amount. In testing for goodwill impairment, the Company has the option to first assess qualitative factors to determine whether the existence of events or circumstances lead to a determination that it is more likely than not that the fair value of a reporting unit is less than its carrying amount. If, after assessing the totality of events and circumstances, the Company concludes that it is not more likely than not that the fair value of a reporting unit is less than its carrying amount, then performing a quantitative impairment test is not necessary. If the Company concludes otherwise, the Company is required to perform a quantitative impairment test.
Impairment of Long-lived Assets	Impairment of Long-lived Assets The Company reviews the recoverability of its long-lived assets (or asset groups) whenever events or changes in circumstances indicate that the carrying amount of the long-lived asset (group) might not be recoverable. The assessment for potential impairment is based primarily on the Company’s ability to recover the carrying value of its long-lived assets from expected future undiscounted cash flows. If the total expected future undiscounted cash flows are less than the carrying amount of the assets, a loss is recognized for the difference between fair value (computed based upon the expected future discounted cash flows) and the carrying value of the assets.
Acquisitions	Acquisitions The Company allocates the purchase price of acquired businesses to their identifiable tangible assets and liabilities as well as identifiable intangible assets, such as customer relationships, technology, non-compete agreements and trade names. Certain estimates and judgments are required in the application of the fair value techniques, including estimates of the respective acquisition's future performance and related cash flows, selection of a discount rate and economic lives, and use of Level 3 measurements as defined in ASC No. 820, Fair Value Measurements and Disclosure.
Research and Engineering	Research and Engineering Research and product development costs are expensed as incurred.
Advertising, Promotions and Marketing	Advertising, Promotions and Marketing
Fair Value of Financial Instruments	Fair Value of Financial Instruments
Foreign Currency Translation	Foreign Currency Translation The financial position and results of operations of the Company’s foreign subsidiaries are measured using their functional currencies, which are their local currencies. Assets and liabilities of foreign subsidiaries are translated into the U.S. Dollar at the exchange rates in effect at the balance sheet date. Income and expenses are translated at the average exchange rate during the period. Translation gains and losses are reported as a component of other comprehensive income (loss) for the period and included in accumulated other comprehensive income (loss) within stockholders’ equity.
Self-Insurance	Self-Insurance The Company is self-insured for certain losses relating to workers’ compensation and health benefit claims. The Company maintains third-party excess insurance coverage for all workers' compensation and health benefit claims in excess of approximately $0.3 million per occurrence to reduce its exposure from such claims. Self-insured losses are accrued when it is probable that an uninsured claim has been incurred but not reported and the amount of the loss can be reasonably estimated at the balance sheet date.
Share-based Compensation	Share-based Compensation The value of services received from employees and directors in exchange for an award of an equity instrument is measured based on the grant-date fair value of the award. Such value is recognized as a non-cash expense on a straight-line basis over the minimum period the individual provides services, which is typically the vesting period of the award with the exception of awards with graded vesting that contain an internal performance measure where each tranche is recognized on a straight-line basis over its vesting period subject to the probability of meeting the performance requirements and adjusted for the number of shares expected to be earned. Awards to certain employees eligible for retirement prior to the award becoming fully vested are amortized to expense over the period through the date that the employee first becomes eligible to retire and is no longer required to provide service to earn the award. As share-based compensation expense is based on awards ultimately expected to vest, the amount of expense is reduced for estimated forfeitures. The cost of these awards is recorded in selling, general and administrative expenses in the Company’s Consolidated Statements of Income (Loss).
Income Taxes	Income Taxes Income taxes are accounted for under the asset and liability method. We recognize deferred tax assets and liabilities at enacted income tax rates for the temporary differences between the financial reporting bases and the tax bases of our assets and liabilities. Any effects of changes in income tax rates or tax laws are included in the provision for income taxes in the period of enactment. Our net deferred tax assets primarily consist of net operating loss carry forwards, or NOLs. A valuation allowance is provided if it is more likely than not that some or all of a deferred income tax asset will not be realized. A current tax liability or asset is recognized for the estimated taxes payable or refundable on tax returns for the current and prior years. We recognize the tax benefit from an uncertain tax position only if it is more likely than not that the tax position will be sustained on examination by the taxing authorities, based on the technical merits of the position. The tax benefits recognized in the financial statements from such a position are measured based on the largest benefit that has a greater than 50% likelihood of being realized upon ultimate resolution.
Recent Accounting Pronouncements	Recent Accounting Pronouncements In March 2020 and updated in January 2021, the FASB issued Accounting Standards Update ("ASU") 2020-04 and 2021-01, “Reference Rate Reform (Topic 848): Facilitation of the Effects of Reference Rate Reform on Financial Reporting.” The amendments provide optional guidance for a limited period of time to ease the potential burden in accounting for (or recognizing the effects of) reference rate reform on financial reporting. The guidance provides optional expedients and exceptions for applying U.S. GAAP to contract modifications and hedging relationships, subject to meeting certain criteria, that reference LIBOR or another rate that is expected to be discontinued. The amendments in ASU 2020-04 are effective for all entities as of March 12, 2020 through December 31, 2024. The Company is currently evaluating applicable contracts and the available expedients provided by the new guidance.
Revenue	Revenue The Company derives the majority of its revenue by providing services on a time and material basis that are short-term in nature. The Company accounts for revenue in accordance with ASC Topic 606, Revenue from Contracts with Customers. Performance Obligations The Company provides highly integrated and bundled inspection services to its customers. The majority of the Company's contracts have a single performance obligation as the promise to transfer the individual goods or services is not separately identifiable from other promises in the contracts and is, therefore, not distinct. For contracts with multiple performance obligations, the Company allocates the contract’s transaction price to each performance obligation using the Company's best estimate of the standalone selling price of each distinct good or service in the contract. The primary method used to estimate standalone selling price is a relative selling price based on price lists. Contract modifications are not routine in the performance of the Company's contracts. Generally, when contracts are modified, the modification is to account for changes in scope to the goods and services that are provided. In most instances, contract modifications are for goods or services that are distinct, and, therefore, are accounted for as a separate contract. The Company's performance obligations are satisfied over time as work progresses or at a point in time. The majority of the Company's revenue is recognized over time as work progresses for the Company's service deliverables, which includes providing testing, inspection and mechanical services to the Company's customers. Revenue is recognized over time, based on time and material incurred to date which best portrays the transfer of control to the customer. The Company also utilizes an available practical expedient that provides for revenue to be recognized in an amount that corresponds directly with the value to the customer of the entity’s performance completed to date. Fixed fee arrangements are determined based on expected labor, material, and overhead to be consumed on fulfillment of such services. For these arrangements, revenue is recognized on a cost-to-cost method tracked on an input basis. The majority of the Company's revenue recognized at a point in time is related to product sales when the customer obtains control of the asset, which is generally upon shipment to the customer. Contract costs include labor, material and overhead. The Company expects any significant remaining performance obligations to be satisfied within one year. Contract Estimates
Fair Value Measurements	Fair Value Measurements The Company performs fair value measurements in accordance with the guidance provided by ASC 820, Fair Value Measurements and Disclosures . ASC 820 defines fair value as the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date. It also establishes a three level hierarchy that prioritizes the inputs used to measure fair value. The three levels of the hierarchy are defined as follows: Level 1 — Inputs are unadjusted quoted prices in active markets for identical assets or liabilities that the Company has the ability to access at the measurement date. Level 2 — Observable inputs other than quoted prices included in Level 1, including quoted prices for similar assets or liabilities in active markets, quoted prices for identical assets or liabilities in inactive markets, inputs other than quoted prices that are observable for the asset or liability and inputs derived principally from or corroborated by observable market data. Level 3 — Unobservable inputs reflecting the Company’s own assumptions about inputs that market participants would use in pricing the asset or liability based on the best information available. Financial instruments measured at fair value on a recurring basis The fair value of contingent consideration liabilities was estimated using a discounted cash flow technique with significant inputs that are not observable in the market and thus represents a Level 3 fair value measurement as defined in ASC 820. The significant inputs in the Level 3 measurement not supported by market activity include the probability assessments of expected future cash flows related to the acquisitions, appropriately discounted considering the uncertainties associated with the obligation, and as calculated in accordance with the terms of the applicable acquisition agreements.

Revenue (Tables)

Revenue (Tables)	12 Months Ended
	Dec. 31, 2022
Revenue from Contract with Customer [Abstract]
Schedule of Disaggregated Revenues by Segment	The following series of tables present the Company's disaggregated revenue: Revenue by industry was as follows (in thousands): Year ended December 31, 2022 Services International Products Corp/Elim Total Oil & Gas $ 356,763 $ 30,654 $ 335 $ — $ 387,752 Aerospace & Defense 61,475 18,763 314 — $ 80,552 Industrials 38,197 23,703 2,083 — $ 63,983 Power Generation and Transmission 31,197 8,304 2,603 — $ 42,104 Other Process Industries 40,778 14,021 28 — $ 54,827 Infrastructure, Research & Engineering 15,283 7,946 3,994 — $ 27,223 Petrochemical 15,360 536 — — $ 15,896 Other 14,283 8,498 3,370 (11,115) $ 15,036 Total $ 573,336 $ 112,425 $ 12,727 $ (11,115) $ 687,373 Year ended December 31, 2021 Services International Products Corp/Elim Total Oil & Gas $ 330,880 $ 35,232 $ 808 $ — $ 366,920 Aerospace & Defense 51,593 16,513 286 — $ 68,392 Industrials 41,873 24,000 1,842 — $ 67,715 Power Generation and Transmission 39,966 9,927 2,853 — $ 52,746 Other Process Industries 38,742 12,593 64 — $ 51,399 Infrastructure, Research & Engineering 16,809 11,496 3,985 — $ 32,290 Petrochemical 19,378 227 — — 19,605 Other 16,146 7,257 3,993 (9,332) $ 18,064 Total $ 555,387 $ 117,245 $ 13,831 $ (9,332) $ 677,131 Year ended December 31, 2020 Services International Products Corp/Elim Total Oil & Gas $ 279,723 $ 39,383 $ 377 $ — $ 319,483 Aerospace & Defense 50,813 18,166 1,292 — $ 70,271 Industrials 44,919 19,657 1,852 — $ 66,428 Power Generation and Transmission 30,005 7,559 2,323 — $ 39,887 Other Process Industries 24,671 10,029 171 — $ 34,871 Infrastructure, Research & Engineering 17,070 10,353 6,364 — $ 33,787 Petrochemical 18,882 345 53 — 19,280 Other 10,081 2,064 4,017 (7,598) $ 8,564 Total 476,164 107,556 16,449 $ (7,598) $ 592,571 Revenue per key geographic location was as follows (in thousands): Year ended December 31, 2022 Services International Products Corp/Elim Total United States $ 485,551 $ 910 $ 6,495 $ (3,083) $ 489,873 Other Americas 83,877 9,076 406 (4,105) 89,254 Europe 2,811 99,714 1,896 (3,502) 100,919 Asia-Pacific 1,097 2,725 3,930 (425) 7,327 Total $ 573,336 $ 112,425 $ 12,727 $ (11,115) $ 687,373 Year ended December 31, 2021 Services International Products Corp/Elim Total United States $ 472,125 $ 912 $ 6,469 $ (4,284) $ 475,222 Other Americas 80,013 5,003 395 (1,768) 83,643 Europe 1,841 108,411 2,174 (2,812) 109,614 Asia-Pacific 1,408 2,919 4,793 (468) 8,652 Total $ 555,387 $ 117,245 $ 13,831 $ (9,332) $ 677,131 Year ended December 31, 2020 Services International Products Corp/Elim Total United States $ 406,437 $ 911 $ 7,551 $ (3,410) $ 411,489 Other Americas $ 68,150 $ 4,581 $ 550 $ (446) 72,835 Europe $ 904 $ 99,953 $ 3,154 $ (3,470) 100,541 Asia-Pacific $ 673 $ 2,111 $ 5,194 $ (272) 7,706 Total $ 476,164 $ 107,556 $ 16,449 $ (7,598) $ 592,571

Earnings per Share (Tables)

Earnings per Share (Tables)	12 Months Ended
	Dec. 31, 2022
Earnings Per Share [Abstract]
Schedule of Computations of Basic and Diluted Earnings Per Share	The following table sets forth the computations of basic and diluted earnings (loss) per share (in thousands except share data): For the year ended December 31, 2022 2021 2020 Basic earnings (loss) per share: Numerator: Net income (loss) attributable to Mistras Group, Inc. $ 6,499 $ 3,860 $ (99,461) Denominator Weighted average common shares outstanding 29,901 29,572 29,147 Basic earnings (loss) per share $ 0.22 $ 0.13 $ (3.41) Diluted earnings (loss) per share: Numerator: Net income (loss) attributable to Mistras Group, Inc. $ 6,499 $ 3,860 $ (99,461) Denominator Weighted average common shares outstanding 29,901 29,572 29,147 Dilutive effect of stock options outstanding — 558 — Dilutive effect of restricted stock units outstanding 328 — — 30,229 30,130 29,147 Diluted earnings (loss) per share $ 0.21 $ 0.13 $ (3.41)
Schedule of Potential Common Shares Excluded From the Computation of Diluted Earnings Per Share	The following potential common stock were excluded from the computation of diluted earnings per share, as the effect would have been anti-dilutive: For the year ended December 31, 2022 2021 2020 Potential common stock attributable to restricted stock units (RSUs) and performance stock units (PSUs) outstanding (1) 1,005 109 790 Potential common stock attributable to stock options outstanding 1 5 5 Total 1,006 114 795 (1) For the year ended December 31, 2020, 254 shares related to RSUs/PSUs, were excluded from the calculation of diluted EPS due to the net loss for the period.

Accounts Receivable (Tables)

Accounts Receivable (Tables)	12 Months Ended
	Dec. 31, 2022
Receivables [Abstract]
Schedule of Accounts Receivable, Net	Accounts receivable consist of the following (in thousands): December 31, 2022 2021 Trade accounts receivable $ 127,767 $ 112,739 Allowance for credit losses (4,110) (3,228) Accounts receivable, net $ 123,657 $ 109,511

Inventories (Tables)

Inventories (Tables)	12 Months Ended
	Dec. 31, 2022
Inventory Disclosure [Abstract]
Schedule of Inventories	Inventories consist of the following (in thousands): December 31, 2022 2021 Raw materials $ 5,351 $ 4,794 Work in progress 336 551 Finished goods 5,475 4,621 Consumable supplies 2,394 2,720 Inventories $ 13,556 $ 12,686

Property, Plant and Equipment (

Property, Plant and Equipment (Tables)	12 Months Ended
	Dec. 31, 2022
Property, Plant and Equipment [Abstract]
Schedule of Property, Plant and Equipment, Net	December 31, Useful Life 2022 2021 (Years) (in thousands) Land $ 2,529 $ 2,762 Building and improvements 30-40 24,800 24,787 Office furniture and equipment 5-8 18,057 16,620 Machinery and equipment 5-7 251,282 250,166 296,668 294,335 Accumulated depreciation and amortization (219,107) (207,757) Property, plant and equipment, net $ 77,561 $ 86,578

Acquisitions (Tables)

Acquisitions (Tables)	12 Months Ended
	Dec. 31, 2022
Business Combination and Asset Acquisition [Abstract]
Schedule of Acquisition-related Expenses	These amounts are recorded as acquisition-related expense, net, on the Consolidated Statements of Income (Loss) and were as follows for the years ended December 31, 2022, 2021 and 2020 (in thousands): For the year ended December 31, 2022 2021 2020 Due diligence, professional fees and other transaction costs $ 31 $ 5 $ — Adjustments to fair value of contingent consideration liabilities 45 1,128 337 Acquisition-related expense, net $ 76 $ 1,133 $ 337

Goodwill (Tables)

Goodwill (Tables)	12 Months Ended
	Dec. 31, 2022
Goodwill and Intangible Assets Disclosure [Abstract]
Schedule of Changes in Carrying Amount of Goodwill by Segment	The changes in the carrying amount of goodwill by segment is shown below (in thousands): Services International Products and Systems Total Balance at December 31, 2020 $ 190,112 $ 15,896 $ — $ 206,008 Adjustments to preliminary purchase price allocations 280 — — 280 Foreign currency translation 264 (1,113) — (849) Balance at December 31, 2021 $ 190,656 $ 14,783 $ — $ 205,439 Foreign currency translation (4,946) (858) — (5,804) Balance at December 31, 2022 $ 185,710 $ 13,925 $ — $ 199,635

Intangible Assets (Tables)

Intangible Assets (Tables)	12 Months Ended
	Dec. 31, 2022
Goodwill and Intangible Assets Disclosure [Abstract]
Schedule of Gross Amount and Accumulated Amortization of Intangible Assets	The gross carrying amount and accumulated amortization of intangible assets were as follows (in thousands): December 31, 2022 2021 Useful Life (Years) Gross Accumulated Net Gross Accumulated Net Customer relationships 5-18 $ 109,683 $ (84,130) $ 25,553 $ 112,109 $ (80,319) $ 31,790 Software/Technology 3-15 51,028 (28,669) 22,359 52,265 (26,415) 25,850 Covenants not to compete 2-5 12,488 (12,416) 72 12,623 (12,390) 233 Other 2-12 10,389 (9,358) 1,031 10,574 (9,066) 1,508 Total $ 183,588 $ (134,573) $ 49,015 $ 187,571 $ (128,190) $ 59,381
Schedule of Expected Amortization Expense of Intangible Assets	Amortization expense in each of the five years and thereafter subsequent to December 31, 2022 related to the Company’s intangible assets is expected to be as follows (in thousands): Expected Amortization Expense 2023 $ 8,915 2024 7,633 2025 5,796 2026 4,988 2027 4,664 Thereafter 17,019 Total $ 49,015

Accrued Expenses and Other Cu_2

Accrued Expenses and Other Current Liabilities (Tables)	12 Months Ended
	Dec. 31, 2022
Payables and Accruals [Abstract]
Schedule of Accrued Expenses and Other Current Liabilities	Accrued expenses and other current liabilities consist of the following (in thousands): December 31, 2022 2021 Accrued salaries, wages and related employee benefits $ 26,684 $ 33,816 Contingent consideration 937 1,830 Accrued workers' compensation and health benefits 3,660 3,994 Deferred revenues 7,521 6,202 Right-of-use liability - Operating 10,376 10,040 Pension accrual 2,519 2,519 Other accrued expenses 26,147 25,462 Total accrued expenses and other current liabilities $ 77,844 $ 83,863

Long-Term Debt (Tables)

Long-Term Debt (Tables)	12 Months Ended
	Dec. 31, 2022
Debt Disclosure [Abstract]
Schedule of Long-term Debt	Long-term debt consisted of the following (in thousands): December 31, 2022 2021 Senior credit facility $ 65,250 $ 119,500 Senior secured term loan, net of unamortized debt issuance costs of $0.5 million and $0.2 million 121,399 76,673 Other 4,602 6,392 Total debt 191,251 202,565 Less: Current portion (7,425) (20,162) Long-term debt, net of current portion $ 183,826 $ 182,403
Schedule of Principal Payments Due Under All Borrowing Agreements	Scheduled principal payments due under all borrowing agreements in each of the five years and thereafter subsequent to December 31, 2022 are as follows (in thousands): 2023 $ 7,526 2024 9,711 2025 11,623 2026 12,864 2027 148,728 Thereafter 799 Total $ 191,251

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	12 Months Ended
	Dec. 31, 2022
Fair Value Disclosures [Abstract]
Schedule of Changes in Fair Value of Level 3 Contingent Consideration	The following table represents the changes in the fair value of Level 3 contingent consideration (in thousands): December 31, 2022 2021 Balance at the beginning of the period: $ 1,830 $ 1,640 Acquisitions — — Payments (938) (938) Accretion of liability — — Revaluation 45 1,128 Foreign currency translation — — Balance at the end of the period: $ 937 $ 1,830

Share-Based Compensation (Table

Share-Based Compensation (Tables)	12 Months Ended
	Dec. 31, 2022
Share-Based Payment Arrangement [Abstract]
Schedule of Cash Proceeds and Aggregate Fair Value of Stock Options Exercised	In addition, there were no stock options exercised during the years ended December 31, 2022, 2021 and 2020.
Schedule of Stock Options Activity	The following table sets forth a summary of the stock option activity, weighted-average exercise prices and options outstanding as of December 31, 2022, 2021 and 2020 as follows (in thousands, except per share amounts and years): For the years ended December 31, 2022 2021 2020 Common Weighted Common Stock Options Weighted Average Exercise Price Common Weighted Outstanding at beginning of year: 5 $ 22.35 5 $ 22.35 5 $ 22.35 Granted — $ — — $ — — $ — Exercised — $ — — $ — — $ — Expired or forfeited (5) $ 22.35 — $ — — $ — Outstanding at end of year: — $ — 5 $ 22.35 5 $ 22.35
Schedule of Vesting Activity of Restricted Stock Units	A summary of the vesting activity of restricted stock unit awards, with the respective fair value of the awards, is as follows (in thousands): For the year ended December 31, 2022 2021 2020 Restricted stock awards vested 401 317 208 Fair value of awards vested $ 2,524 $ 3,434 $ 837
Schedule of Fully-vested Common Stocks Issued to Non-employee Directors	A summary of the fully-vested common stock the Company issued to its six non-employee directors, in connection with its non-employee director compensation plan, is as follows (in thousands): For the year ended December 31, 2022 2021 2020 Awards issued 70 51 68 Grant date fair value of awards issued $ 450 $ 525 $ 326
Schedule of Non-vested Restricted Share Units	A summary of the Company's outstanding, non-vested restricted share units is as follows (in thousands, except per share amounts and years): For the year ended December 31, 2022 2021 2020 Units Weighted Units Weighted Units Weighted Outstanding at beginning of period: 1,208 $ 7.96 1,076 $ 7.41 559 $ 16.92 Granted 687 $ 7.59 528 $ 10.07 782 $ 3.79 Released (401) $ 6.63 (317) $ 10.77 (208) $ 18.71 Forfeited (79) $ 14.23 (79) $ 8.82 (57) $ 9.62 Outstanding at end of period: 1,415 $ 6.66 1,208 $ 7.96 1,076 $ 7.41
Schedule of Performance Shares Units Activity	A summary of the Company's PRSU activity is presented as follows (in thousands, except per share amounts and years): For the year ended December 31, 2022 2021 2020 Units Weighted Units Weighted Units Weighted Outstanding at beginning of period: 388 $ 10.07 333 $ 8.84 260 $ 16.77 Granted 341 $ 6.55 189 $ 12.59 292 $ 3.68 Performance condition adjustments, net (376) $ 7.71 (56) $ 9.27 (99) $ 3.82 Released (73) $ 5.17 (78) $ 8.15 (120) $ 17.29 Forfeited — $ — — $ — — $ — Outstanding at end of period: 280 $ 9.96 388 $ 10.07 333 $ 8.84

Income Taxes (Tables)

Income Taxes (Tables)	12 Months Ended
	Dec. 31, 2022
Income Tax Disclosure [Abstract]
Schedule of Income (Loss) Before Provision for Income Taxes	Income (loss) before provision (benefit) for income taxes is as follows (in thousands): For the year ended December 31, 2022 2021 2020 Income (loss) before provision (benefit) for income taxes from: U.S. operations $ 439 $ 1,527 $ (54,190) Foreign operations 8,855 5,761 (59,982) Income (loss) before provision (benefit) for income taxes $ 9,294 $ 7,288 $ (114,172)
Schedule of Provision (Benefit) for Income Taxes	The provision (benefit) for income taxes consists of the following (in thousands): For the year ended December 31, 2022 2021 2020 Current Federal $ (644) $ (182) $ (6,278) States and local 464 246 528 Foreign 3,251 3,641 4,006 Reserve for uncertain tax positions 136 (186) (28) Total current provision (benefit) 3,207 3,519 (1,772) Deferred Federal (435) (309) (2,781) States and local 242 (138) (1,244) Foreign (1,614) (1,884) (10,045) Reserve for uncertain tax positions — 155 — Total deferred benefit (1,807) (2,176) (14,070) Net change in valuation allowance 1,320 2,052 1,136 Net deferred benefit (487) (124) (12,934) Total provision (benefit) for income taxes $ 2,720 $ 3,395 $ (14,706)
Schedule of Provision (Benefit) for Income Taxes Computed by Applying Statutory Federal Tax Rate	The provision (benefit) for income taxes differs from the amount computed by applying the statutory federal tax rate to income tax as follows (in thousands): For the years ended December 31, 2022 2021 2020 Federal tax at statutory rate $ 1,952 21.0 % $ 1,527 21.0 % $ (23,976) 21.0 % State taxes, net of federal benefit 622 6.7 % 75 1.0 % (1,175) 1.0 % Foreign tax 218 2.3 % 380 5.2 % (815) 0.7 % Goodwill impairment — — % — — % 10,003 (8.8) % Nondeductible compensation — — % 119 1.6 % 975 (0.9) % US taxation of foreign earnings 100 1.1 % (1,041) (14.3) % 56 — % Permanent differences 363 3.9 % 373 5.1 % 944 (0.8) % Research and Development Credit (1,716) (18.5) % (214) 2.9 % (236) 0.2 % Federal loss carryback — — % — — % (1,938) 1.7 % Change in valuation allowance 1,320 14.2 % 2,052 28.2 % 1,136 (1.0) % Impact of foreign tax rate changes (246) (2.6) % 49 0.7 % 392 (0.3) % Other 107 1.2 % 75 1.0 % (72) 0.1 % Total provision (benefit) for income taxes $ 2,720 29.3 % $ 3,395 52.4 % $ (14,706) 12.9 %
Schedule of Net Deferred Income Tax Assets and Liabilities	Deferred income tax attributes resulting from differences between financial accounting amounts and income tax basis of assets and liabilities are as follows (in thousands): December 31, 2022 2021 Deferred income tax assets Allowance for doubtful accounts $ 826 $ 677 Inventory 806 567 Intangible assets 1,178 1,733 Accrued expenses 4,365 5,662 Net operating loss carryforward 4,985 6,303 Finance lease obligations 463 741 Deferred stock based compensation 1,152 996 Interest carryforward 1,501 618 Right-of-use liability 9,886 10,786 R&D Expense 2,836 — Credits 490 409 Other 1,495 1,353 Deferred income tax assets 29,983 29,845 Valuation allowance (7,787) (6,340) Net deferred income tax assets 22,196 23,505 Deferred income tax liabilities Property and equipment (6,493) (8,157) Goodwill (7,645) (5,819) Intangible assets (3,601) (4,935) Right-of-use asset (9,841) (10,738) Other (122) (67) Deferred income tax liabilities (27,702) (29,716) Net deferred income taxes (5,506) (6,211)
Schedule of Changes in Company's Gross Unrecognized Tax Benefits, Excluding Interest and Penalties	The following table summarizes the changes in the Company’s gross unrecognized tax benefits, excluding interest and penalties (in thousands): For the year ended December 31, 2022 2021 Balance at beginning of period $ 300 $ 347 Additions for tax positions related to the current fiscal period — 155 Additions for tax positions related to prior years 1 1 Reductions related to the expiration of statutes of limitations (43) (203) Balance at end of period $ 258 $ 300

Leases (Tables)

Leases (Tables)	12 Months Ended
	Dec. 31, 2022
Leases [Abstract]
Schedule of Supplemental Balance Sheet Information	The Company’s Consolidated Balance Sheets include the following related to operating leases as of December 31, 2022 and 2021 (in thousands): Leases Classification 2022 2021 Assets: ROU assets Other Assets $ 36,946 $ 42,451 Liabilities: ROU liability - current Accrued expenses and other current liabilities $ 10,376 $ 10,040 ROU liability - long-term Other long-term liabilities 28,066 34,030 Total ROU liabilities $ 38,442 $ 44,070
Schedule of Components of Lease Costs and Other Information Related to Leases	The components of lease costs for the year ended December 31, 2022 and 2021 are as follows (in thousands): Classification 2022 2021 Finance lease expense: Amortization of ROU assets Depreciation and amortization $ 4,068 $ 4,111 Interest on lease liabilities Interest expense 624 721 Operating lease expense Cost of revenue; Selling, general & administrative expenses 12,783 13,042 Short-term lease expense Cost of revenue; Selling, general & administrative expenses 77 27 Variable lease expense Cost of revenue; Selling, general & administrative expenses 2,141 2,507 Total $ 19,693 $ 20,408 Additional information related to leases as of December 31, 2022 and 2021 is as follows: 2022 2021 Cash paid for amounts included in the measurement of lease liabilities for finance and operating leases (in thousands): Finance - financing cash flows $ 4,140 $ 4,060 Finance - operating cash flows 624 721 Operating - operating cash flows 12,502 13,098 ROU assets obtained in the exchange for lease liabilities: Finance leases $ 5,076 2,923 Operating leases 6,067 7,021 Weighted-average remaining lease term (in years): Finance leases 5.1 5.4 Operating leases 4.7 5.3 Weighted-average discount rate: Finance leases 5.5 % 5.3 % Operating leases 5.6 % 5.7 %
Schedule of Maturities of Operating Lease Liabilities	Maturities of lease liabilities as of December 31, 2022 is as follows (in thousands): Finance Operating 2023 $ 6,131 $ 12,109 2024 3,970 9,869 2025 2,448 7,304 2026 1,747 5,272 2027 842 4,119 Thereafter 255 5,089 Total 15,393 43,762 Less: Present value discount 1,147 5,320 Lease liability $ 14,246 $ 38,442
Schedule of Maturities of Finance Lease Liabilities	Maturities of lease liabilities as of December 31, 2022 is as follows (in thousands): Finance Operating 2023 $ 6,131 $ 12,109 2024 3,970 9,869 2025 2,448 7,304 2026 1,747 5,272 2027 842 4,119 Thereafter 255 5,089 Total 15,393 43,762 Less: Present value discount 1,147 5,320 Lease liability $ 14,246 $ 38,442

Segment Disclosure (Tables)

Segment Disclosure (Tables)	12 Months Ended
	Dec. 31, 2022
Segment Reporting [Abstract]
Schedule of Financial Information by Segment	Selected consolidated financial information by segment for the periods shown was as follows (with intercompany transactions eliminated in Corporate and eliminations): For the year ended December 31, 2022 2021 2020 Revenue Services $ 573,336 $ 555,387 $ 476,164 International 112,425 117,245 107,556 Products and Systems 12,727 13,831 16,449 Corporate and eliminations (11,115) (9,332) (7,598) $ 687,373 $ 677,131 $ 592,571 For the year ended December 31, 2022 2021 2020 Gross profit Services $ 159,049 $ 155,384 $ 141,084 International 33,591 34,282 31,046 Products and Systems 5,490 7,001 6,826 Corporate and eliminations 43 480 (425) $ 198,173 $ 197,147 $ 178,531 Income (loss) from operations by operating segment includes intercompany transactions, which are eliminated in Corporate and eliminations . For the year ended December 31, 2022 2021 2020 Income (loss) from operations Services $ 49,616 $ 48,458 $ (44,222) International 3,566 1,839 (21,855) Products and Systems (992) (117) (936) Corporate and eliminations (32,391) (32,010) (34,204) $ 19,799 $ 18,170 $ (101,217) For the year ended December 31, 2022 2021 2020 Depreciation and amortization Services $ 25,103 $ 25,259 $ 26,093 International 7,648 8,791 8,659 Products and Systems 810 928 998 Corporate and eliminations (267) (57) (45) $ 33,294 $ 34,921 $ 35,705 December 31, 2022 2021 Intangible assets, net Services $ 43,260 $ 51,862 International 4,422 6,344 Products and Systems 1,208 1,042 Corporate and eliminations 125 133 $ 49,015 $ 59,381 December 31, 2022 2021 Total assets Services $ 407,779 $ 424,058 International 104,531 111,619 Products and Systems 12,408 10,532 Corporate and eliminations 10,186 15,986 $ 534,904 $ 562,195
Schedule of Long-lived Assets by Geographic Area	December 31, 2022 2021 Long-lived assets United States $ 176,237 $ 183,052 Other Americas 108,582 120,012 Europe 41,392 48,334 $ 326,211 $ 351,398

Selected Quarterly Financial _2

Selected Quarterly Financial Information (unaudited) (Tables)	12 Months Ended
	Dec. 31, 2022
Quarterly Financial Information Disclosure [Abstract]
Schedule of Selected Quarterly Results of Operations	The following is a summary of the quarterly results of operations for calendar years 2022, 2021, and 2020 (in thousands). Quarter ended December 31, 2022 September 30, 2022 June 30, 2022 March 31, 2022 Revenue $ 168,218 $ 178,462 $ 179,031 $ 161,662 Gross Profit 50,939 53,784 53,558 39,892 Income (loss) from operations 5,802 9,114 9,576 (4,698) Net income (loss) attributable to Mistras Group, Inc. $ 2,842 $ 4,373 $ 4,643 $ (5,363) Earnings (loss) per common share: Basic $ 0.09 $ 0.15 $ 0.15 $ (0.18) Diluted $ 0.09 $ 0.14 $ 0.15 $ (0.18) Quarter ended December 31, 2021 September 30, 2021 June 30, 2021 March 31, 2021 Revenues $ 171,163 $ 174,556 $ 177,677 $ 153,735 Gross Profit 49,594 52,216 55,336 40,001 Income (loss) from operations 2,306 9,236 11,374 (4,746) Net income (loss) attributable to Mistras Group, Inc. $ (94) $ 3,380 $ 5,937 $ (5,362) Earnings (loss) per common share: Basic $ 0.00 $ 0.11 $ 0.20 $ (0.18) Diluted $ 0.00 $ 0.11 $ 0.20 $ (0.18) Quarter ended December 31, 2020 September 30, 2020 June 30, 2020 March 31, 2020 Revenues $ 160,777 $ 147,894 $ 124,435 $ 159,465 Gross Profit 49,345 47,384 41,158 40,644 Income (loss) from operations 4,652 5,742 (383) (111,228) Net income (loss) attributable to Mistras Group, Inc. $ 181 $ 1,523 $ (2,656) $ (98,509) Earnings (loss) per common share: Basic $ 0.01 $ 0.05 $ (0.09) $ (3.40) Diluted $ 0.01 $ 0.05 $ (0.09) $ (3.40)

Summary of Significant Accoun_3

Summary of Significant Accounting Policies and Practices (Details) - USD ($) $ in Thousands	1 Months Ended	12 Months Ended
	Jul. 31, 2020	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Concentration Risk [Line Items]
Assets of VIE		$ 534,904	$ 562,195
Foreign currency gains (losses)		(200)	400	$ 3,000
Minimum amount of excess self-insurance claims paid to reduce exposure		300
Variable Interest Entity, Primary Beneficiary
Concentration Risk [Line Items]
Assets of VIE		0
Revenues		4,700
Limited Partnership | Variable Interest Entity, Primary Beneficiary
Concentration Risk [Line Items]
Limited partnership ownership interest percentage	49%
General partnership ownership interest percentage	49%
Selling, General and Administrative Expenses
Concentration Risk [Line Items]
Advertising expense		$ 2,000	$ 1,000	$ 800
Software/Technology
Concentration Risk [Line Items]
Estimated useful life of internal-use software		3 years

Revenue - Narrative (Details)

Revenue - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue recognized that was included in contract liability balance at the beginning of the year	$ 4.7	$ 4.6
Revenue, practical expedient, incremental cost of obtaining a contract, maximum period	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2023-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation, expected timing of satisfaction period	1 year

Revenue - Disaggregated Revenue

Revenue - Disaggregated Revenues by Segment (Details) - USD ($) $ in Thousands	3 Months Ended												12 Months Ended
	Dec. 31, 2022	Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2022	Dec. 31, 2021	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Disaggregation of Revenue [Line Items]
Revenue	$ 168,218	$ 178,462	$ 179,031	$ 161,662	$ 171,163	$ 174,556	$ 177,677	$ 153,735	$ 160,777	$ 147,894	$ 124,435	$ 159,465	$ 687,373	$ 677,131	$ 592,571
United States
Disaggregation of Revenue [Line Items]
Revenue													489,873	475,222	411,489
Other Americas
Disaggregation of Revenue [Line Items]
Revenue													89,254	83,643	72,835
Europe
Disaggregation of Revenue [Line Items]
Revenue													100,919	109,614	100,541
Asia-Pacific
Disaggregation of Revenue [Line Items]
Revenue													7,327	8,652	7,706
Oil & Gas
Disaggregation of Revenue [Line Items]
Revenue													387,752	366,920	319,483
Aerospace & Defense
Disaggregation of Revenue [Line Items]
Revenue													80,552	68,392	70,271
Industrials
Disaggregation of Revenue [Line Items]
Revenue													63,983	67,715	66,428
Power Generation and Transmission
Disaggregation of Revenue [Line Items]
Revenue													42,104	52,746	39,887
Other Process Industries
Disaggregation of Revenue [Line Items]
Revenue													54,827	51,399	34,871
Infrastructure, Research & Engineering
Disaggregation of Revenue [Line Items]
Revenue													27,223	32,290	33,787
Petrochemical
Disaggregation of Revenue [Line Items]
Revenue													15,896	19,605	19,280
Other
Disaggregation of Revenue [Line Items]
Revenue													15,036	18,064	8,564
Operating segments | Services
Disaggregation of Revenue [Line Items]
Revenue													573,336	555,387	476,164
Operating segments | Services | United States
Disaggregation of Revenue [Line Items]
Revenue													485,551	472,125	406,437
Operating segments | Services | Other Americas
Disaggregation of Revenue [Line Items]
Revenue													83,877	80,013	68,150
Operating segments | Services | Europe
Disaggregation of Revenue [Line Items]
Revenue													2,811	1,841	904
Operating segments | Services | Asia-Pacific
Disaggregation of Revenue [Line Items]
Revenue													1,097	1,408	673
Operating segments | Services | Oil & Gas
Disaggregation of Revenue [Line Items]
Revenue													356,763	330,880	279,723
Operating segments | Services | Aerospace & Defense
Disaggregation of Revenue [Line Items]
Revenue													61,475	51,593	50,813
Operating segments | Services | Industrials
Disaggregation of Revenue [Line Items]
Revenue													38,197	41,873	44,919
Operating segments | Services | Power Generation and Transmission
Disaggregation of Revenue [Line Items]
Revenue													31,197	39,966	30,005
Operating segments | Services | Other Process Industries
Disaggregation of Revenue [Line Items]
Revenue													40,778	38,742	24,671
Operating segments | Services | Infrastructure, Research & Engineering
Disaggregation of Revenue [Line Items]
Revenue													15,283	16,809	17,070
Operating segments | Services | Petrochemical
Disaggregation of Revenue [Line Items]
Revenue													15,360	19,378	18,882
Operating segments | Services | Other
Disaggregation of Revenue [Line Items]
Revenue													14,283	16,146	10,081
Operating segments | International
Disaggregation of Revenue [Line Items]
Revenue													112,425	117,245	107,556
Operating segments | International | United States
Disaggregation of Revenue [Line Items]
Revenue													910	912	911
Operating segments | International | Other Americas
Disaggregation of Revenue [Line Items]
Revenue													9,076	5,003	4,581
Operating segments | International | Europe
Disaggregation of Revenue [Line Items]
Revenue													99,714	108,411	99,953
Operating segments | International | Asia-Pacific
Disaggregation of Revenue [Line Items]
Revenue													2,725	2,919	2,111
Operating segments | International | Oil & Gas
Disaggregation of Revenue [Line Items]
Revenue													30,654	35,232	39,383
Operating segments | International | Aerospace & Defense
Disaggregation of Revenue [Line Items]
Revenue													18,763	16,513	18,166
Operating segments | International | Industrials
Disaggregation of Revenue [Line Items]
Revenue													23,703	24,000	19,657
Operating segments | International | Power Generation and Transmission
Disaggregation of Revenue [Line Items]
Revenue													8,304	9,927	7,559
Operating segments | International | Other Process Industries
Disaggregation of Revenue [Line Items]
Revenue													14,021	12,593	10,029
Operating segments | International | Infrastructure, Research & Engineering
Disaggregation of Revenue [Line Items]
Revenue													7,946	11,496	10,353
Operating segments | International | Petrochemical
Disaggregation of Revenue [Line Items]
Revenue													536	227	345
Operating segments | International | Other
Disaggregation of Revenue [Line Items]
Revenue													8,498	7,257	2,064
Operating segments | Products
Disaggregation of Revenue [Line Items]
Revenue													12,727	13,831	16,449
Operating segments | Products | United States
Disaggregation of Revenue [Line Items]
Revenue													6,495	6,469	7,551
Operating segments | Products | Other Americas
Disaggregation of Revenue [Line Items]
Revenue													406	395	550
Operating segments | Products | Europe
Disaggregation of Revenue [Line Items]
Revenue													1,896	2,174	3,154
Operating segments | Products | Asia-Pacific
Disaggregation of Revenue [Line Items]
Revenue													3,930	4,793	5,194
Operating segments | Products | Oil & Gas
Disaggregation of Revenue [Line Items]
Revenue													335	808	377
Operating segments | Products | Aerospace & Defense
Disaggregation of Revenue [Line Items]
Revenue													314	286	1,292
Operating segments | Products | Industrials
Disaggregation of Revenue [Line Items]
Revenue													2,083	1,842	1,852
Operating segments | Products | Power Generation and Transmission
Disaggregation of Revenue [Line Items]
Revenue													2,603	2,853	2,323
Operating segments | Products | Other Process Industries
Disaggregation of Revenue [Line Items]
Revenue													28	64	171
Operating segments | Products | Infrastructure, Research & Engineering
Disaggregation of Revenue [Line Items]
Revenue													3,994	3,985	6,364
Operating segments | Products | Petrochemical
Disaggregation of Revenue [Line Items]
Revenue													0	0	53
Operating segments | Products | Other
Disaggregation of Revenue [Line Items]
Revenue													3,370	3,993	4,017
Corp/Elim
Disaggregation of Revenue [Line Items]
Revenue													(11,115)	(9,332)	(7,598)
Corp/Elim | United States
Disaggregation of Revenue [Line Items]
Revenue													(3,083)	(4,284)	(3,410)
Corp/Elim | Other Americas
Disaggregation of Revenue [Line Items]
Revenue													(4,105)	(1,768)	(446)
Corp/Elim | Europe
Disaggregation of Revenue [Line Items]
Revenue													(3,502)	(2,812)	(3,470)
Corp/Elim | Asia-Pacific
Disaggregation of Revenue [Line Items]
Revenue													(425)	(468)	(272)
Corp/Elim | Oil & Gas
Disaggregation of Revenue [Line Items]
Revenue													0	0	0
Corp/Elim | Aerospace & Defense
Disaggregation of Revenue [Line Items]
Revenue													0	0	0
Corp/Elim | Industrials
Disaggregation of Revenue [Line Items]
Revenue													0	0	0
Corp/Elim | Power Generation and Transmission
Disaggregation of Revenue [Line Items]
Revenue													0	0	0
Corp/Elim | Other Process Industries
Disaggregation of Revenue [Line Items]
Revenue													0	0	0
Corp/Elim | Infrastructure, Research & Engineering
Disaggregation of Revenue [Line Items]
Revenue													0	0	0
Corp/Elim | Petrochemical
Disaggregation of Revenue [Line Items]
Revenue													0	0	0
Corp/Elim | Other
Disaggregation of Revenue [Line Items]
Revenue													$ (11,115)	$ (9,332)	$ (7,598)

Earnings per Share - Computatio

Earnings per Share - Computations of Basic and Diluted Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended												12 Months Ended
	Dec. 31, 2022	Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2022	Dec. 31, 2021	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Basic earnings (loss) per share:
Net income (loss) attributable to Mistras Group, Inc.	$ 2,842	$ 4,373	$ 4,643	$ (5,363)	$ (94)	$ 3,380	$ 5,937	$ (5,362)	$ 181	$ 1,523	$ (2,656)	$ (98,509)	$ 6,499	$ 3,860	$ (99,461)
Denominator
Weighted average common shares outstanding (in shares)													29,901	29,572	29,147
Basic earnings (loss) per share (in dollars per share)	$ 0.09	$ 0.15	$ 0.15	$ (0.18)	$ 0	$ 0.11	$ 0.20	$ (0.18)	$ 0.01	$ 0.05	$ (0.09)	$ (3.40)	$ 0.22	$ 0.13	$ (3.41)
Denominator
Weighted average common shares outstanding (in shares)													29,901	29,572	29,147
Dilutive effect of stock options outstanding (in shares)													0	558	0
Dilutive effect of restricted stock units outstanding (in shares)													328	0	0
Weighted average common shares outstanding, diluted (in shares)													30,229	30,130	29,147
Diluted earnings (loss) per share (in dollars per share)	$ 0.09	$ 0.14	$ 0.15	$ (0.18)	$ 0	$ 0.11	$ 0.20	$ (0.18)	$ 0.01	$ 0.05	$ (0.09)	$ (3.40)	$ 0.21	$ 0.13	$ (3.41)

Earnings per Share - Potential

Earnings per Share - Potential Common Shares Excluded From Computation of Diluted Earnings (Details) - shares shares in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Potential common shares excluded from computation of diluted earnings per share (in shares)	1,006	114	795
RSUs/PSUs
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Potential common shares excluded from computation of diluted earnings per share (in shares)	1,005	109	790
Potential common shares excluded from computation of diluted earnings per share due to net loss for the period (in shares)			254
Stock Options
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Potential common shares excluded from computation of diluted earnings per share (in shares)	1	5	5

Accounts Receivable - Summary (

Accounts Receivable - Summary (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Receivables [Abstract]
Trade accounts receivable	$ 127,767	$ 112,739
Allowance for credit losses	(4,110)	(3,228)
Accounts receivable, net	$ 123,657	$ 109,511

Accounts Receivable - Narrative

Accounts Receivable - Narrative (Details) - USD ($) $ in Thousands	1 Months Ended	3 Months Ended
	Dec. 31, 2019	Dec. 31, 2021	Dec. 31, 2022
Receivables [Abstract]
Unbilled revenues		$ 11,900	$ 13,500
Concentration Risk [Line Items]
Accounts receivable, net		109,511	$ 123,657
Accounts receivable written off		$ 5,000
Texas Customer
Concentration Risk [Line Items]
Accounts receivable, net	$ 1,400
Verbal demand for damages	$ 1,400

Inventories (Details)

Inventories (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Inventory Disclosure [Abstract]
Raw materials	$ 5,351	$ 4,794
Work in progress	336	551
Finished goods	5,475	4,621
Consumable supplies	2,394	2,720
Inventories	$ 13,556	$ 12,686

Property, Plant and Equipment_2

Property, Plant and Equipment (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Property, Plant and Equipment, net
Property, plant and equipment, gross	$ 296,668	$ 294,335
Accumulated depreciation and amortization	(219,107)	(207,757)
Property, plant and equipment, net	77,561	86,578
Depreciation expense	24,100	25,200	$ 24,700
Land
Property, Plant and Equipment, net
Property, plant and equipment, gross	2,529	2,762
Building and improvements
Property, Plant and Equipment, net
Property, plant and equipment, gross	$ 24,800	24,787
Building and improvements | Minimum
Property, Plant and Equipment, net
Useful Life	30 years
Building and improvements | Maximum
Property, Plant and Equipment, net
Useful Life	40 years
Office furniture and equipment
Property, Plant and Equipment, net
Property, plant and equipment, gross	$ 18,057	16,620
Office furniture and equipment | Minimum
Property, Plant and Equipment, net
Useful Life	5 years
Office furniture and equipment | Maximum
Property, Plant and Equipment, net
Useful Life	8 years
Machinery and equipment
Property, Plant and Equipment, net
Property, plant and equipment, gross	$ 251,282	$ 250,166
Machinery and equipment | Minimum
Property, Plant and Equipment, net
Useful Life	5 years
Machinery and equipment | Maximum
Property, Plant and Equipment, net
Useful Life	7 years

Acquisitions - Narrative (Detai

Acquisitions - Narrative (Details) - Small NDT Services Company - Canada $ in Millions	3 Months Ended	12 Months Ended
	Mar. 31, 2021 USD ($)	Dec. 31, 2021 entity
Business Acquisition [Line Items]
Number of acquisitions | entity		1
Percentage of equity interest acquired	100%
Cash consideration paid | $	$ 0.4

Acquisitions - Acquisition-Rela

Acquisitions - Acquisition-Related Expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Business Combination and Asset Acquisition [Abstract]
Due diligence, professional fees and other transaction costs	$ 31	$ 5	$ 0
Adjustments to fair value of contingent consideration liabilities	45	1,128	337
Acquisition-related expense, net	$ 76	$ 1,133	$ 337

Goodwill - Changes in Carrying

Goodwill - Changes in Carrying Amount of Goodwill (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Changes in the carrying amount of goodwill
Balance at the beginning of the period	$ 205,439	$ 206,008
Adjustments to preliminary purchase price allocations		280
Foreign currency translation	(5,804)	(849)
Balance at the end of the period	199,635	205,439
Services
Changes in the carrying amount of goodwill
Balance at the beginning of the period	190,656	190,112
Adjustments to preliminary purchase price allocations		280
Foreign currency translation	(4,946)	264
Balance at the end of the period	185,710	190,656
International
Changes in the carrying amount of goodwill
Balance at the beginning of the period	14,783	15,896
Adjustments to preliminary purchase price allocations		0
Foreign currency translation	(858)	(1,113)
Balance at the end of the period	13,925	14,783
Products and Systems
Changes in the carrying amount of goodwill
Balance at the beginning of the period	0	0
Adjustments to preliminary purchase price allocations		0
Foreign currency translation	0	0
Balance at the end of the period	$ 0	$ 0

Goodwill - Narrative (Details)

Goodwill - Narrative (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Dec. 31, 2022	Dec. 31, 2021
Goodwill
Cumulative goodwill impairment		$ 100.2	$ 100.2
Services
Goodwill
Cumulative goodwill impairment		57.2	57.2
Products and Systems
Goodwill
Cumulative goodwill impairment		13.2	13.2
International
Goodwill
Cumulative goodwill impairment		$ 29.8	$ 29.8
COVID-19
Goodwill
Impairment charges	$ 77.1
COVID-19 | Services
Goodwill
Impairment charges	57.2
COVID-19 | European Reporting Unit
Goodwill
Impairment charges	19.3
COVID-19 | Brazilian Reporting Unit
Goodwill
Impairment charges	$ 0.6

Intangible Assets - Gross Carry

Intangible Assets - Gross Carrying Amount and Accumulated Amortization (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Finite-Lived Intangible Assets [Line Items]
Gross Amount	$ 183,588	$ 187,571
Accumulated Amortization	(134,573)	(128,190)
Net Carrying Amount	49,015	59,381
Customer relationships
Finite-Lived Intangible Assets [Line Items]
Gross Amount	109,683	112,109
Accumulated Amortization	(84,130)	(80,319)
Net Carrying Amount	$ 25,553	31,790
Customer relationships | Minimum
Finite-Lived Intangible Assets [Line Items]
Useful Life (Years)	5 years
Customer relationships | Maximum
Finite-Lived Intangible Assets [Line Items]
Useful Life (Years)	18 years
Software/Technology
Finite-Lived Intangible Assets [Line Items]
Useful Life (Years)	3 years
Gross Amount	$ 51,028	52,265
Accumulated Amortization	(28,669)	(26,415)
Net Carrying Amount	$ 22,359	25,850
Software/Technology | Minimum
Finite-Lived Intangible Assets [Line Items]
Useful Life (Years)	3 years
Software/Technology | Maximum
Finite-Lived Intangible Assets [Line Items]
Useful Life (Years)	15 years
Covenants not to compete
Finite-Lived Intangible Assets [Line Items]
Gross Amount	$ 12,488	12,623
Accumulated Amortization	(12,416)	(12,390)
Net Carrying Amount	$ 72	233
Covenants not to compete | Minimum
Finite-Lived Intangible Assets [Line Items]
Useful Life (Years)	2 years
Covenants not to compete | Maximum
Finite-Lived Intangible Assets [Line Items]
Useful Life (Years)	5 years
Other
Finite-Lived Intangible Assets [Line Items]
Gross Amount	$ 10,389	10,574
Accumulated Amortization	(9,358)	(9,066)
Net Carrying Amount	$ 1,031	$ 1,508
Other | Minimum
Finite-Lived Intangible Assets [Line Items]
Useful Life (Years)	2 years
Other | Maximum
Finite-Lived Intangible Assets [Line Items]
Useful Life (Years)	12 years

Intangible Assets - Narrative (

Intangible Assets - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Finite-Lived Intangible Assets [Line Items]
Amortization of expense of intangible assets	$ 9.1	$ 9.7	$ 11
Impairment, Intangible Asset, Finite-Lived, Statement of Income or Comprehensive Income [Extensible Enumeration]	Impairment charges
Services | COVID-19
Finite-Lived Intangible Assets [Line Items]
Impairment charge of long-lived assets			28.8
Software/Technology
Finite-Lived Intangible Assets [Line Items]
Amortization of expense of intangible assets	$ 2.9	$ 3	3.6
Software/Technology | Services | COVID-19
Finite-Lived Intangible Assets [Line Items]
Impairment charge of long-lived assets			25.9
Customer relationships | Services | COVID-19
Finite-Lived Intangible Assets [Line Items]
Impairment charge of long-lived assets			2.2
Other | Services | COVID-19
Finite-Lived Intangible Assets [Line Items]
Impairment charge of long-lived assets			0.5
Covenants not to compete | Services | COVID-19
Finite-Lived Intangible Assets [Line Items]
Impairment charge of long-lived assets			$ 0.2

Intangible Assets - Expected Am

Intangible Assets - Expected Amortization Expense (Details) $ in Thousands	Dec. 31, 2022 USD ($)
Goodwill and Intangible Assets Disclosure [Abstract]
2023	$ 8,915
2024	7,633
2025	5,796
2026	4,988
2027	4,664
Thereafter	17,019
Net Carrying Amount	$ 49,015

Accrued Expenses and Other Cu_3

Accrued Expenses and Other Current Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Payables and Accruals [Abstract]
Accrued salaries, wages and related employee benefits	$ 26,684	$ 33,816
Contingent consideration	937	1,830
Accrued workers' compensation and health benefits	3,660	3,994
Deferred revenues	7,521	6,202
Right-of-use liability - Operating	10,376	10,040
Pension accrual	2,519	2,519
Other accrued expenses	26,147	25,462
Total accrued expenses and other current liabilities	$ 77,844	$ 83,863

Long-Term Debt - Schedule of Lo

Long-Term Debt - Schedule of Long-Term Debt (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Debt Instrument [Line Items]
Total debt	$ 191,251	$ 202,565
Less: Current portion	(7,425)	(20,162)
Long-term debt, net of current portion	183,826	182,403
Senior credit facility
Debt Instrument [Line Items]
Total debt	65,250	119,500
Senior credit facility | Senior Secured Term Loan
Debt Instrument [Line Items]
Unamortized debt issuance costs	500	200
Total debt	121,399	76,673
Other
Debt Instrument [Line Items]
Total debt	$ 4,602	$ 6,392

Long-Term Debt - Narrative (Det

Long-Term Debt - Narrative (Details)		3 Months Ended	12 Months Ended
	Aug. 01, 2022 USD ($)	Sep. 30, 2022 USD ($)	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)	May 19, 2021 USD ($)
Debt Instrument [Line Items]
Financing costs incurred			$ 147,000	$ 550,000	$ 1,497,000
Other debt outstanding			191,251,000	202,565,000
Senior credit facility
Debt Instrument [Line Items]
Borrowings outstanding under line of credit			186,600,000
Outstanding letters of credit			3,000,000
Capitalized debt modification costs			1,400,000
Other debt outstanding			65,250,000	119,500,000
Senior credit facility | Senior Secured Term Loan
Debt Instrument [Line Items]
Other debt outstanding			121,399,000	76,673,000
Senior credit facility | Credit Agreement
Debt Instrument [Line Items]
Capitalized unamortized debt issuance costs		$ 800,000
Financing costs incurred		1,600,000
Capitalized debt issuance costs expensed		$ 200,000
Senior credit facility | The Credit Agreement, JP Morgan Chase Bank
Debt Instrument [Line Items]
Other debt outstanding			121,400,000
Other
Debt Instrument [Line Items]
Other debt outstanding			4,602,000	$ 6,392,000
Other | Minimum
Debt Instrument [Line Items]
Debt periodic payments			$ 1,000
Interest rate			0.40%
Other | Maximum
Debt Instrument [Line Items]
Debt periodic payments			$ 15,000
Interest rate			3.50%
Line of Credit | Senior credit facility
Debt Instrument [Line Items]
Maximum borrowing capacity						$ 150,000,000
Line of Credit | The Credit Agreement, JP Morgan Chase Bank
Debt Instrument [Line Items]
Debt Instrument, Covenant, Consolidated Debt Leverage Ratio, Maximum Margin Applicable, If Greater Than	3.75
Debt Instrument, Covenant, Fixed Charge Coverage Ratio	1.25
Debt Instrument, Covenant, Number Of Days Before Business Acquisition, Written Notice Required	5 days
Debt Instrument, Covenant, Threshold Business Acquisition, Minimum Amount	$ 10,000,000
Debt Instrument, Covenant, Consolidated Debt Leverage Ratio, Lowest Available Margin Applicable	1.25
Line of Credit | The Credit Agreement, JP Morgan Chase Bank | Senior credit facility
Debt Instrument [Line Items]
Maximum borrowing capacity	$ 190,000,000
Line Of Credit Facility Maximum Borrowing Capacity In Non-U.S. Currencies	$ 100,000,000
Maturity term from the date of acquisition	5 years
Line of Credit | The Credit Agreement, JP Morgan Chase Bank | Secured Debt
Debt Instrument [Line Items]
Debt Instrument, Face Amount	$ 125,000,000					$ 100,000,000
Line of Credit | The Credit Agreement, JP Morgan Chase Bank | Letter of Credit
Debt Instrument [Line Items]
Maximum amount available for the issuance of letters of credit	$ 20,000,000
Line of Credit | The Credit Agreement, JP Morgan Chase Bank | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate | Minimum | Variable Rate Component
Debt Instrument [Line Items]
Margin rate (as a percent)	1.25%
Line of Credit | The Credit Agreement, JP Morgan Chase Bank | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate | Maximum | Variable Rate Component
Debt Instrument [Line Items]
Margin rate (as a percent)	2.75%
Line of Credit | The Credit Agreement, JP Morgan Chase Bank | March 31, 2022
Debt Instrument [Line Items]
Total consolidated debt leverage ratio	4
Line of Credit | The Credit Agreement, JP Morgan Chase Bank | Each quarter thereafter
Debt Instrument [Line Items]
Total consolidated debt leverage ratio	3.75
Line of Credit | The Credit Agreement, JP Morgan Chase Bank | For quarter ending December 31, 2020 and or each quarter end thereafter
Debt Instrument [Line Items]
Debt periodic payments	$ 1,560,000
Line of Credit | The Credit Agreement, JP Morgan Chase Bank | Each quarter thereafter
Debt Instrument [Line Items]
Debt periodic payments	2,340,000
Line of Credit | The Credit Agreement, JP Morgan Chase Bank | Quarter ending December 31, 2020 and decreasing each successive quarter
Debt Instrument [Line Items]
Debt periodic payments	$ 3,120,000

Long-Term Debt - Scheduled Prin

Long-Term Debt - Scheduled Principal Payments (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Debt Disclosure [Abstract]
2023	$ 7,526
2024	9,711
2025	11,623
2026	12,864
2027	148,728
Thereafter	799
Total debt	$ 191,251	$ 202,565

Fair Value Measurements (Detail

Fair Value Measurements (Details) - Level 3 - Contingent Consideration - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward
Balance at the beginning of period	$ 1,830	$ 1,640
Acquisitions	0	0
Payments	(938)	(938)
Accretion of liability	0	0
Revaluation	45	1,128
Foreign currency translation	0	0
Balance at the end of the period	$ 937	$ 1,830

Share-Based Compensation - Long

Share-Based Compensation - Long-term Incentive Plans (Details)		12 Months Ended
	May 19, 2020 shares	Dec. 31, 2022 plan shares	Dec. 31, 2021 shares	Dec. 31, 2020 shares	May 23, 2022 shares	Dec. 31, 2019 shares
Share-based compensation
Number of employee stock ownership plans | plan		2
Stock options granted (in shares)		0	0	0
Stock options outstanding (in shares)		0	5,000	5,000		5,000
2009 Plan
Share-based compensation
Number of awards authorized for grants (in shares)		0
2016 Plan
Share-based compensation
Number of awards authorized for grants (in shares)					4,900,000
Increase in number of shares authorized for grant (in shares)	1,200,000
Number of awards available for future grants (in shares)		1,900,000

Share-Based Compensation - Stoc

Share-Based Compensation - Stock Options Narrative (Details) - USD ($)	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Share-based compensation
Outstanding stock option award fully vested (in shares)	1	1	1
Stock Options
Share-based compensation
Recognized share-based compensation expense	$ 0	$ 0	$ 0
Unrecognized compensation costs remained related to stock option awards	$ 0

Share-Based Compensation - St_2

Share-Based Compensation - Stock Option Activity (Details) - $ / shares shares in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Common Stock Options (shares)
Outstanding at beginning of year: (in shares)	5	5	5
Granted (in shares)	0	0	0
Exercised (in shares)	0	0	0
Expired or forfeited (in shares)	(5)	0	0
Outstanding at end of year: (in shares)	0	5	5
Weighted Average Exercise Price (in dollar per share)
Outstanding at beginning of year: (in dollars per share)	$ 22.35	$ 22.35	$ 22.35
Granted (in dollars per share)	0	0	0
Exercised (in dollars per share)	0	0	0
Expired or forfeited (in dollars per share)	22.35	0	0
Outstanding at end of year: (in dollars per share)	$ 0	$ 22.35	$ 22.35

Share-Based Compensation - Rest

Share-Based Compensation - Restricted Stock Units Awards Narrative (Details) - Restricted Stock Units - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Share-based compensation
Recognized share-based compensation expense	$ 3.7	$ 3.5	$ 4.4
Unrecognized compensation cost, net of estimated forfeitures, related to restricted stock unit awards	$ 6.6
Weighted-average period over which unrecognized compensation cost is expected to be recognized	2 years 7 months 6 days
Vesting period	4 years

Share-Based Compensation - Vest

Share-Based Compensation - Vesting Activity of Restricted Stock Unit Awards (Details) - Restricted Stock Units - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Share-based compensation
Restricted stock awards vested	401	317	208
Fair value of awards vested	$ 2,524	$ 3,434	$ 837

Share-Based Compensation - Comm

Share-Based Compensation - Common Stock Issued to Non-employee Directors (Details) - Non-employee directors - Common Stock shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2022 USD ($) director shares	Dec. 31, 2021 USD ($) shares	Dec. 31, 2020 USD ($) shares
Share-based compensation
Number of non-employee directors to whom fully vested common stock is granted | director	6
Awards issued (in shares) | shares	70	51	68
Grant date fair value of awards issued (in dollars per share) | $	$ 450	$ 525	$ 326

Share-Based Compensation - Re_2

Share-Based Compensation - Restricted Stock Unit Awards Outstanding (Details) - Restricted Stock Units - $ / shares shares in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Outstanding at beginning of period: (in shares)	1,208	1,076	559
Granted (in shares)	687	528	782
Released (in shares)	(401)	(317)	(208)
Forfeited (in shares)	(79)	(79)	(57)
Outstanding at end of period: (in shares)	1,415	1,208	1,076
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]
Outstanding at beginning of period: (in dollars per share)	$ 6.66	$ 7.96	$ 7.41	$ 16.92
Granted (in dollars per share)	7.59	10.07	3.79
Released (in dollars per share)	6.63	10.77	18.71
Forfeited (in dollars per share)	14.23	8.82	9.62
Outstanding at end of period: (in dollars per share)	$ 6.66	$ 7.96	$ 7.41	$ 16.92

Share-Based Compensation - Perf

Share-Based Compensation - Performance Restricted Stock Units Narrative (Details) shares in Thousands, $ in Millions	3 Months Ended	12 Months Ended
	Mar. 31, 2021	Dec. 31, 2022 USD ($) shares	Dec. 31, 2021 USD ($) entity shares	Dec. 31, 2020 USD ($) shares	Dec. 31, 2019 shares
PRSUs
Share-based compensation
Number of restricted stocks units granted (in shares)		341	189	292
Net reduction in number of awards with performance against target (in shares)		376	56	99
Increase in number of awards against target performance (in shares)				1
Unvested restricted stock units outstanding (in shares)		280	388	333	260
PRSUs | Executive and senior officers
Share-based compensation
Performance payout period	1 year	1 year
Number of metrics | entity			3
Average share price trading period			20 days	20 days
Share price, last day in trading period			20 days	20 days
Requisite service period		5 years
Recognized share-based compensation expense | $		$ 1.2	$ 1.4	$ 1.2
Unrecognized compensation cost, net of estimated forfeitures, related to restricted stock unit awards | $		$ 1.2
Weighted-average period over which unrecognized compensation cost is expected to be recognized		1 year 3 months 18 days
Income tax benefit recognized on share-based compensation | $		$ 1.6	$ 1.4	$ 0.6
Vesting period		4 years
Restricted Stock Units
Share-based compensation
Number of restricted stocks units granted (in shares)		687	528	782
Unvested restricted stock units outstanding (in shares)		1,415	1,208	1,076	559
Recognized share-based compensation expense | $		$ 3.7	$ 3.5	$ 4.4
Unrecognized compensation cost, net of estimated forfeitures, related to restricted stock unit awards | $		$ 6.6
Weighted-average period over which unrecognized compensation cost is expected to be recognized		2 years 7 months 6 days
Vesting period		4 years
Restricted Stock Units | Executive and senior officers
Share-based compensation
Dividend yield			0%

Share-Based Compensation - Pe_2

Share-Based Compensation - Performance Restricted Stock Units Activity (Details) - PRSUs - $ / shares shares in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Outstanding at beginning of period: (in shares)	388	333	260
Granted (in shares)	341	189	292
Performance condition adjustments, net (in shares)	(376)	(56)	(99)
Released (in shares)	(73)	(78)	(120)
Forfeited (in shares)	0	0	0
Outstanding at end of period: (in shares)	280	388	333
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]
Outstanding at beginning of period: (in dollars per share)	$ 9.96	$ 10.07	$ 8.84	$ 16.77
Granted (in dollars per share)	6.55	12.59	3.68
Performance condition adjustments, net (in dollars per share)	7.71	9.27	3.82
Released (in dollars per share)	5.17	8.15	17.29
Forfeited (in dollars per share)	0	0	0
Outstanding at end of period: (in dollars per share)	$ 9.96	$ 10.07	$ 8.84	$ 16.77

Income Taxes - Income (Loss) Be

Income Taxes - Income (Loss) Before Provision for Income Taxes (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Income (loss) before provision (benefit) for income taxes from:
U.S. operations	$ 439	$ 1,527	$ (54,190)
Foreign operations	8,855	5,761	(59,982)
Income (loss) before provision (benefit) for income taxes	$ 9,294	$ 7,288	$ (114,172)

Income Taxes - Provision (Benef

Income Taxes - Provision (Benefit) for Income Taxes (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Current
Federal	$ (644)	$ (182)	$ (6,278)
States and local	464	246	528
Foreign	3,251	3,641	4,006
Reserve for uncertain tax positions	136	(186)	(28)
Total current provision (benefit)	3,207	3,519	(1,772)
Deferred
Federal	(435)	(309)	(2,781)
States and local	242	(138)	(1,244)
Foreign	(1,614)	(1,884)	(10,045)
Reserve for uncertain tax positions	0	155	0
Total deferred benefit	(1,807)	(2,176)	(14,070)
Change in valuation allowance	1,320	2,052	1,136
Net deferred benefit	(487)	(124)	(12,934)
Total provision (benefit) for income taxes	$ 2,720	$ 3,395	$ (14,706)

Income Taxes - Provision (Ben_2

Income Taxes - Provision (Benefit) for Income Taxes Computed By Applying Statutory Federal Tax Rate (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Effective Income Tax Rate Reconciliation, Amount [Abstract]
Federal tax at statutory rate	$ 1,952	$ 1,527	$ (23,976)
State taxes, net of federal benefit	622	75	(1,175)
Foreign tax	218	380	(815)
Goodwill impairment	0	0	10,003
Nondeductible compensation	0	119	975
US taxation of foreign earnings	100	(1,041)	56
Permanent differences	363	373	944
Research and Development Credit	(1,716)	(214)	(236)
Federal loss carryback	0	0	(1,938)
Change in valuation allowance	1,320	2,052	1,136
Impact of foreign tax rate changes	(246)	49	392
Other	107	75	(72)
Total provision (benefit) for income taxes	$ 2,720	$ 3,395	$ (14,706)
Effective Income Tax Rate Reconciliation, Percent [Abstract]
Federal tax at statutory rate	21%	21%	21%
State taxes, net of federal benefit	6.70%	1%	1%
Foreign tax	2.30%	5.20%	0.70%
Goodwill impairment	0%	0%	(8.80%)
Nondeductible compensation	0%	1.60%	(0.90%)
US taxation of foreign earnings	1.10%	(14.30%)	0%
Permanent differences	3.90%	5.10%	(0.80%)
Research and Development Credit	(18.50%)	2.90%	0.20%
Federal loss carryback	0%	0%	1.70%
Change in valuation allowance	14.20%	28.20%	(1.00%)
Impact of foreign tax rate changes	(2.60%)	0.70%	(0.30%)
Other	1.20%	1%	0.10%
Total provision (benefit) for income taxes	29.30%	52.40%	12.90%

Income Taxes - Narrative (Detai

Income Taxes - Narrative (Details) - USD ($)	3 Months Ended												12 Months Ended
	Dec. 31, 2022	Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2022	Dec. 31, 2021	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Operating Loss Carryforwards [Line Items]
Increase in income tax benefits are result of CARES Act													$ 0	$ 0	$ 1,938,000
Cash refunds of taxes paid in prior years as result of CARES Act														4,900,000
Deferred tax assets valuation allowance	$ 7,787,000				$ 6,340,000								7,787,000	6,340,000
Net decrease in valuation allowance													100,000
Unrecognized tax benefits	258,000				300,000				$ 347,000				258,000	300,000	347,000
Unrecognized tax benefits that would favorably affect the effective tax rate, if recognized	300,000				300,000								300,000	300,000
Expected decrease in unrecognized tax benefits within the next 12 months	100,000												100,000
Net income (loss) of foreign subsidiaries	2,842,000	$ 4,373,000	$ 4,643,000	$ (5,363,000)	$ (94,000)	$ 3,380,000	$ 5,937,000	$ (5,362,000)	$ 181,000	$ 1,523,000	$ (2,656,000)	$ (98,509,000)	6,499,000	3,860,000	(99,461,000)
Recognized a deferred tax liability on undistributed international earnings (losses) of foreign subsidiaries	0												0
Unrecorded deferred tax liability related to undistributed international earnings	1,800,000												1,800,000
Federal
Operating Loss Carryforwards [Line Items]
Net operating losses	0												0
State
Operating Loss Carryforwards [Line Items]
Net operating losses	20,600,000												20,600,000
Net operating losses expiring from 2023 to 2040	6,600,000												6,600,000
Foreign
Operating Loss Carryforwards [Line Items]
Net operating losses	14,100,000												14,100,000
Net operating losses expiring from 2023 to 2040	$ 1,800,000												1,800,000
Net income (loss) of foreign subsidiaries													$ 5,800,000	$ 3,700,000	$ (55,700,000)
Foreign | Canadian Province of Alberta
Operating Loss Carryforwards [Line Items]
Favorable impact foreign in tax rate from revaluation of net deferred tax liabilities																$ (1,900,000)

Income Taxes - Deferred Income

Income Taxes - Deferred Income Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Deferred income tax assets
Allowance for doubtful accounts	$ 826	$ 677
Inventory	806	567
Intangible assets	1,178	1,733
Accrued expenses	4,365	5,662
Net operating loss carryforward	4,985	6,303
Finance lease obligations	463	741
Deferred stock based compensation	1,152	996
Interest carryforward	1,501	618
Right-of-use liability	9,886	10,786
R&D Expense	2,836	0
Credits	490	409
Other	1,495	1,353
Deferred income tax assets	29,983	29,845
Valuation allowance	(7,787)	(6,340)
Net deferred income tax assets	22,196	23,505
Deferred income tax liabilities
Property and equipment	(6,493)	(8,157)
Goodwill	(7,645)	(5,819)
Intangible assets	(3,601)	(4,935)
Right-of-use asset	(9,841)	(10,738)
Other	(122)	(67)
Deferred income tax liabilities	(27,702)	(29,716)
Net deferred income taxes	$ (5,506)	$ (6,211)

Income Taxes - Changes in Unrec

Income Taxes - Changes in Unrecognized Tax Benefits (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Balance at beginning of period	$ 300	$ 347
Additions for tax positions related to the current fiscal period	0	155
Additions for tax positions related to prior years	1	1
Reductions related to the expiration of statutes of limitations	(43)	(203)
Balance at end of period	$ 258	$ 300

Employee Benefit Plans (Details

Employee Benefit Plans (Details)	12 Months Ended
	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)
Multiemployer Plans [Line Items]
Minimum age for employees to contribute catch up contributions under IRS limits	50 years
Continuous service period required for eligibility of employees to participate under the plan	3 months
Maximum Company match amount of employee contributions matched up to 6% of annual compensation (as a percent)	50%
Maximum percentage of employee's annual compensation for which the company contributes a matching contribution (as a percent)	4%
Vesting period for employer matching contribution	5 years
Contribution under 401(k) savings plan	$ 3,000,000	$ 1,200,000	$ 1,100,000
Multiemployer Plans, Pension | Boilermakers and Pipefitters Plans
Multiemployer Plans [Line Items]
Contributions to multi-employer defined benefit plan	$ 0	$ 0
Multiemployer Plans, Pension | Boilermakers and Pipefitters Plans | Minimum
Multiemployer Plans [Line Items]
Multiemployer plan funded status percentage	0.70

Related Party Transactions (Det

Related Party Transactions (Details)	12 Months Ended
	Dec. 31, 2022 USD ($) employee_director	Dec. 31, 2021 USD ($)
Related Party Transactions
Operating rental payments	$ 12,502,000	$ 13,098,000
Consulting Services | Non-employee directors | Capital Management Enterprise (“CME”)
Related Party Transactions
Number of non-employee director | employee_director	1
Related party fees	$ 0

Leases - Supplemental Balance S

Leases - Supplemental Balance Sheet Information (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Assets:
ROU assets	$ 36,946	$ 42,451
Liabilities:
ROU liability - current	10,376	10,040
ROU liability - long-term	28,066	34,030
Total ROU liabilities	$ 38,442	$ 44,070
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration]	Other assets	Other assets
Operating Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration]	Accrued expenses and other current liabilities	Accrued expenses and other current liabilities
Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible Enumeration]	Other long-term liabilities	Other long-term liabilities

Leases - Narrative (Details)

Leases - Narrative (Details) - USD ($) $ in Thousands	1 Months Ended	12 Months Ended
	Feb. 28, 2022	Dec. 31, 2022	Dec. 31, 2021
Lessee, Lease, Description [Line Items]
ROU operating lease liabilities		$ 38,442	$ 44,070
Operating rental payments		12,502	13,098
ROU finance lease assets		13,000	13,800
Company's Headquarter | Operating Lease Arrangement
Lessee, Lease, Description [Line Items]
ROU operating lease liabilities		1,800	2,900
Operating rental payments		$ 1,000	$ 1,300
Percentage of reduction on rental payments	12.50%

Leases - Components of Lease Co

Leases - Components of Lease Costs (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Finance lease expense:
Amortization of ROU assets	$ 4,068	$ 4,111
Interest on lease liabilities	624	721
Operating lease expense	12,783	13,042
Short-term lease expense	77	27
Variable lease expense	2,141	2,507
Total	$ 19,693	$ 20,408

Leases - Other Information Rela

Leases - Other Information Related to Leases (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Cash paid for amounts included in the measurement of lease liabilities for finance and operating leases (in thousands):
Finance - financing cash flows	$ 4,140	$ 4,060	$ 4,095
Finance - operating cash flows	624	721
Operating - operating cash flows	12,502	13,098
ROU assets obtained in the exchange for lease liabilities:
Finance leases	5,076	2,923
Operating leases	$ 6,067	$ 7,021
Weighted-average remaining lease term (in years):
Finance leases	5 years 1 month 6 days	5 years 4 months 24 days
Operating leases	4 years 8 months 12 days	5 years 3 months 18 days
Weighted-average discount rate:
Finance leases	5.50%	5.30%
Operating leases	5.60%	5.70%

Leases - Maturity of Lease Liab

Leases - Maturity of Lease Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Finance
2023	$ 6,131
2024	3,970
2025	2,448
2026	1,747
2027	842
Thereafter	255
Total	15,393
Less: Present value discount	1,147
Lease liability	14,246
Operating
2023	12,109
2024	9,869
2025	7,304
2026	5,272
2027	4,119
Thereafter	5,089
Total	43,762
Less: Present value discount	5,320
Lease liability	$ 38,442	$ 44,070

Commitments and Contingencies (

Commitments and Contingencies (Details)			1 Months Ended		3 Months Ended		12 Months Ended
	Oct. 05, 2021 USD ($)	Aug. 03, 2021	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($) weld	Mar. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)	Dec. 31, 2022 USD ($) claim	Dec. 31, 2018	Mar. 31, 2022	Dec. 31, 2021 USD ($) installment	Jan. 01, 2020 USD ($)
Litigation
Accounts receivable, net							$ 123,657,000			$ 109,511,000
Allowance for doubtful accounts							4,110,000			3,228,000
Multiemployer pension plan liability							2,519,000			$ 2,519,000
Texas Customer
Litigation
Accounts receivable, net				$ 1,400,000
Verbal demand for damages				1,400,000
Litigation and Commercial Claims | Various Pipeline Projects For Texas Customer
Litigation
Verbal demand for damages				$ 7,600,000
Litigation and Commercial Claims | Texas Customer
Litigation
Accounts receivable, net							1,400,000
Number of welds alleged not in compliance | weld				66
Number of welds inspected | weld				16,000
Allowance for doubtful accounts				$ 1,400,000
Litigation and Commercial Claims | Texas Customer | Various Pipeline Projects For Texas Customer
Litigation
Verbal demand for damages				$ 1,400,000
Contingency related charges							$ 100,000
Class Actions
Litigation
Contingency related charges					$ 1,600,000	$ 800,000
Number of proceedings filed | claim							2
Number of consolidated cases | claim							2
Litigation settlement amount	$ 2,300,000
Class action on behalf of current and former employees
Litigation
Number of proceedings filed | claim							1
Class action on behalf of State of California
Litigation
Number of proceedings filed | claim							1
Pension Related Contingencies
Litigation
Multiemployer pension plan liability							$ 2,500,000
Severance and Labor Disputes | Foreign Subsidiary
Litigation
Settlement amount			$ 1,000,000
Number of settlement installments | installment										2
Percentage of settlement installments									0.69	0.31
Gain on settlement			$ 300,000		$ 600,000
Severance and Labor Disputes | GERMANY | Foreign Subsidiary
Litigation
Contingency related charges							100,000
Contingency payments							400,000
Loss contingency reversals							1,000,000
Severance and Labor Disputes | GERMANY | Foreign Subsidiary | Right to Customer Contracts | Disposal Group, Disposed of by Sale, Not Discontinued Operations
Litigation
Consideration received on sale of disposal											$ 100,000
Acquisition-related Contingencies | Products and Systems | Disposal of Foreign Subsidiaries | Disposal Group, Disposed of by Sale, Not Discontinued Operations
Litigation
Term of agreement to purchase products from buyer on sale of subsidiary								3 years
Cumulative amount purchased under purchase agreement							2,300,000
Extension period on agreement with buyer on sale of subsidiary		12 months
Acquisition-related Contingencies | Series of Individually Immaterial Business Acquisitions
Litigation
Potential acquisition-related contingent consideration, low end of range							0
Potential acquisition-related contingent consideration, high end of range							$ 900,000

Segment Disclosure - Financial

Segment Disclosure - Financial Information (Details) $ in Thousands	3 Months Ended												12 Months Ended
	Dec. 31, 2022 USD ($)	Sep. 30, 2022 USD ($)	Jun. 30, 2022 USD ($)	Mar. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)	Sep. 30, 2021 USD ($)	Jun. 30, 2021 USD ($)	Mar. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)	Sep. 30, 2020 USD ($)	Jun. 30, 2020 USD ($)	Mar. 31, 2020 USD ($)	Dec. 31, 2022 USD ($) segment	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)
Segment Reporting [Abstract]
Number of operating segments | segment													3
Financial information by segment
Revenue	$ 168,218	$ 178,462	$ 179,031	$ 161,662	$ 171,163	$ 174,556	$ 177,677	$ 153,735	$ 160,777	$ 147,894	$ 124,435	$ 159,465	$ 687,373	$ 677,131	$ 592,571
Gross profit	50,939	53,784	53,558	39,892	49,594	52,216	55,336	40,001	49,345	47,384	41,158	40,644	198,173	197,147	178,531
Income (loss) from operations	5,802	$ 9,114	$ 9,576	$ (4,698)	2,306	$ 9,236	$ 11,374	$ (4,746)	$ 4,652	$ 5,742	$ (383)	$ (111,228)	19,799	18,170	(101,217)
Depreciation and amortization													33,294	34,921	35,705
Intangible assets, net	49,015				59,381								49,015	59,381
Total assets	534,904				562,195								534,904	562,195
Operating segments | Services
Financial information by segment
Revenue													573,336	555,387	476,164
Gross profit													159,049	155,384	141,084
Income (loss) from operations													49,616	48,458	(44,222)
Depreciation and amortization													25,103	25,259	26,093
Intangible assets, net	43,260				51,862								43,260	51,862
Total assets	407,779				424,058								407,779	424,058
Operating segments | International
Financial information by segment
Revenue													112,425	117,245	107,556
Gross profit													33,591	34,282	31,046
Income (loss) from operations													3,566	1,839	(21,855)
Depreciation and amortization													7,648	8,791	8,659
Intangible assets, net	4,422				6,344								4,422	6,344
Total assets	104,531				111,619								104,531	111,619
Operating segments | Products and Systems
Financial information by segment
Revenue													12,727	13,831	16,449
Gross profit													5,490	7,001	6,826
Income (loss) from operations													(992)	(117)	(936)
Depreciation and amortization													810	928	998
Intangible assets, net	1,208				1,042								1,208	1,042
Total assets	12,408				10,532								12,408	10,532
Corporate and eliminations
Financial information by segment
Revenue													(11,115)	(9,332)	(7,598)
Gross profit													43	480	(425)
Income (loss) from operations													(32,391)	(32,010)	(34,204)
Depreciation and amortization													(267)	(57)	$ (45)
Intangible assets, net	125				133								125	133
Total assets	$ 10,186				$ 15,986								$ 10,186	$ 15,986

Segment Disclosure - Long-lived

Segment Disclosure - Long-lived Assets by Geographic Area (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Revenue and long-lived assets by geographic area
Long-lived assets	$ 326,211	$ 351,398
United States
Revenue and long-lived assets by geographic area
Long-lived assets	176,237	183,052
Other Americas
Revenue and long-lived assets by geographic area
Long-lived assets	108,582	120,012
Europe
Revenue and long-lived assets by geographic area
Long-lived assets	$ 41,392	$ 48,334

Selected Quarterly Financial _3

Selected Quarterly Financial Information (unaudited) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended												12 Months Ended
	Dec. 31, 2022	Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2022	Dec. 31, 2021	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Quarterly Financial Information Disclosure [Abstract]
Revenue	$ 168,218	$ 178,462	$ 179,031	$ 161,662	$ 171,163	$ 174,556	$ 177,677	$ 153,735	$ 160,777	$ 147,894	$ 124,435	$ 159,465	$ 687,373	$ 677,131	$ 592,571
Gross Profit	50,939	53,784	53,558	39,892	49,594	52,216	55,336	40,001	49,345	47,384	41,158	40,644	198,173	197,147	178,531
Income (loss) from operations	5,802	9,114	9,576	(4,698)	2,306	9,236	11,374	(4,746)	4,652	5,742	(383)	(111,228)	19,799	18,170	(101,217)
Net income (loss) attributable to Mistras Group, Inc.	$ 2,842	$ 4,373	$ 4,643	$ (5,363)	$ (94)	$ 3,380	$ 5,937	$ (5,362)	$ 181	$ 1,523	$ (2,656)	$ (98,509)	$ 6,499	$ 3,860	$ (99,461)
Earnings (loss) per common share:
Basic (in dollars per share)	$ 0.09	$ 0.15	$ 0.15	$ (0.18)	$ 0	$ 0.11	$ 0.20	$ (0.18)	$ 0.01	$ 0.05	$ (0.09)	$ (3.40)	$ 0.22	$ 0.13	$ (3.41)
Diluted (in dollars per share)	$ 0.09	$ 0.14	$ 0.15	$ (0.18)	$ 0	$ 0.11	$ 0.20	$ (0.18)	$ 0.01	$ 0.05	$ (0.09)	$ (3.40)	$ 0.21	$ 0.13	$ (3.41)