10-Q

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, DC 20549

FORM 10-Q

(Mark One)

☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

For the quarterly period ended September 30, 2020

OR

☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

For the transition period from          to         

Commission File Number: 001-39394

Montrose Environmental Group, Inc.

(Exact Name of Registrant as Specified in its Charter)

Delaware	46-4195044
( State or other jurisdiction of incorporation or organization)	(I.R.S. Employer Identification No.)
1 Park Plaza, Suite 1000 Irvine, California	92614
(Address of principal executive offices)	(Zip Code)

Registrant’s telephone number, including area code: (949) 988-3500

Securities registered pursuant to Section 12(b) of the Act:

Title of each class	Trading Symbol(s)	Name of each exchange on which registered
Common Stock, par value $0.000004 per share	MEG	The New York Stock Exchange

Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days.     Yes  ☒    No  ☐

Indicate by check mark whether the registrant has submitted electronically every Interactive Data File required to be submitted pursuant to Rule 405 of Regulation S-T (§232.405 of this chapter) during the preceding 12 months (or for such shorter period that the registrant was required to submit such files).     Yes  ☒    No  ☐

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, smaller reporting company, or an emerging growth company. See the definitions of “large accelerated filer,” “accelerated filer,” “smaller reporting company,” and “emerging growth company” in Rule 12b-2 of the Exchange Act.

Large accelerated filer	☐	Accelerated filer	☐
Non-accelerated filer	☒	Smaller reporting company	☐
Emerging growth company	☒

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. ☐

Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act).     Yes  ☐    No  ☒

As of November 11, 2020, the registrant had 24,961,680 shares of common stock, $0.000004 par value per share, outstanding.

Table of Contents

		Page
PART I.	FINANCIAL INFORMATION
Item 1.	Financial Statements (Unaudited)	1
	Unaudited Condensed Consolidated Statements of Financial Position	1
	Unaudited Condensed Consolidated Statements of Operations and Comprehensive Loss	2
	Unaudited Condensed Consolidated Statements of Redeemable Series A-1 Preferred Stock, Convertible and Redeemable Series A-2 Preferred Stock and Stockholders’ Equity (Deficit)	3
	Unaudited Condensed Consolidated Statements of Cash Flows	5
	Notes to Unaudited Condensed Consolidated Financial Statements	6
Item 2.	Management’s Discussion and Analysis of Financial Condition and Results of Operations	32
Item 3.	Quantitative and Qualitative Disclosures About Market Risk	49
Item 4.	Controls and Procedures	49
PART II.	OTHER INFORMATION
Item 1.	Legal Proceedings	50
Item 1A.	Risk Factors	50
Item 2.	Unregistered Sales of Equity Securities and Use of Proceeds	50
Item 3.	Defaults Upon Senior Securities	50
Item 4.	Mine Safety Disclosures	50
Item 5.	Other Information	50
Item 6.	Exhibits	51
Signatures		52

i

PART I—FINANCIAL INFORMATION

Item 1. Financial Statements.

MONTROSE ENVIRONMENTAL GROUP, INC.

UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF FINANCIAL POSITION

(In thousands, except share data)

	September 30,			December 31,
	2020			2019
ASSETS
CURRENT ASSETS:
Cash and restricted cash	$	38,377		$	6,884
Accounts receivable—net		44,785			45,927
Contract assets		35,441			13,605
Prepaid and other current assets		8,585			6,823
Total current assets		127,188			73,239
NON-CURRENT ASSETS:
Property and equipment—net		34,559			27,036
Goodwill		274,309			127,058
Other intangible assets—net		162,201			102,549
Other assets		4,081			1,956
TOTAL ASSETS	$	602,338		$	331,838
LIABILITIES, REDEEMABLE SERIES A-1 PREFERRED STOCK,    CONVERTIBLE AND REDEEMABLE SERIES A-2 PREFERRED STOCK AND    STOCKHOLDERS’ EQUITY (DEFICIT)
CURRENT LIABILITIES:
Accounts payable and other accrued liabilities	$	33,897		$	29,585
Accrued payroll and benefits		17,957			11,032
Warrant option		—			16,878
Business acquisitions contingent consideration, current		49,170			8,614
Current portion of long-term debt		5,034			7,143
Total current liabilities		106,058			73,252
NON-CURRENT LIABILITIES:
Business acquisitions contingent consideration, long-term		9,742			379
Other non-current liabilities		3,431			—
Deferred tax liabilities—net		1,936			3,530
Contingent put option		—			7,100
Conversion option		18,059			—
Long-term debt—net of deferred financing fees		171,417			145,046
Total liabilities		310,643			229,307
COMMITMENTS AND CONTINGENCIES
REDEEMABLE SERIES A-1 PREFERRED STOCK $0.0001 PAR VALUE—
Authorized, issued and outstanding shares: 0 and 12,000 at September 30, 2020 and    December 31, 2019, respectively; aggregate liquidation preference of $0 and $141,898    at September 30, 2020 and December 31, 2019, respectively		—			128,822
CONVERTIBLE AND REDEEMABLE SERIES A-2 PREFERRED STOCK $0.0001    PAR VALUE—
Authorized, issued and outstanding shares: 17,500 and 0 at September 30, 2020 and    December 31, 2019, respectively; aggregate liquidation preference of $182.2 million and    $0 at September 30, 2020 and December 31, 2019, respectively.		152,928			—
STOCKHOLDERS’ EQUITY (DEFICIT):
Common stock, $0.000004 par value; authorized shares: 190,000,000 and 25,000,000 at     September 30, 2020 and December 31, 2019; issued and outstanding shares: 24,893,122 and     8,370,107 at September 30, 2020 and December 31, 2019, respectively.		—			—
Additional paid-in-capital		261,945			38,153
Accumulated deficit		(123,165	)		(64,404	)
Accumulated other comprehensive loss		(13	)		(40	)
Total stockholders’ equity (deficit)		138,767			(26,291	)
TOTAL LIABILITIES, REDEEMABLE SERIES A-1 PREFERRED STOCK,    CONVERTIBLE AND REDEEMABLE SERIES A-2 PREFERRED STOCK    AND STOCKHOLDERS’ EQUITY (DEFICIT)	$	602,338		$	331,838

The accompanying notes are an integral part of these unaudited condensed consolidated financial statements.

1

MONTROSE ENVIRONMENTAL GROUP, INC.

UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS AND

COMPREHENSIVE LOSS

(In thousands, except per share data)

	Three Months Ended						Nine Months Ended
	September 30,						September 30,
	2020			2019			2020			2019
REVENUES	$	84,705		$	57,623		$	219,502		$	165,978
COST OF REVENUES (exclusive of depreciation and    amortization shown below)		51,828			39,804			142,115			116,248
SELLING, GENERAL AND ADMINISTRATIVE EXPENSE		24,442			12,656			64,810			35,464
FAIR VALUE CHANGES IN BUSINESS ACQUISITIONS    CONTINGENT CONSIDERATION		13,404			256			17,387			(670	)
DEPRECIATION AND AMORTIZATION		9,740			7,412			27,084			20,262
LOSS FROM OPERATIONS		(14,709	)		(2,505	)		(31,894	)		(5,326	)
OTHER EXPENSE
Other expense		(9,637	)		(2,460	)		(17,534	)		(3,639	)
Interest expense—net		(3,043	)		(2,130	)		(10,896	)		(4,590	)
Total other expenses—net		(12,680	)		(4,590	)		(28,430	)		(8,229	)
LOSS BEFORE EXPENSE (BENEFIT) FROM INCOME TAXES		(27,389	)		(7,095	)		(60,324	)		(13,555	)
INCOME TAXES EXPENSE (BENEFIT)		3,348			(412	)		(1,563	)		(1,308	)
NET LOSS	$	(30,737	)	$	(6,683	)	$	(58,761	)	$	(12,247	)
EQUITY ADJUSTMENT FROM FOREIGN CURRENCY    TRANSLATION		80			(20	)		27			3
COMPREHENSIVE LOSS		(30,657	)		(6,703	)		(58,734	)		(12,244	)
ACCRETION OF REDEEMABLE SERIES A-1 PREFERRED    STOCK		(6,542	)		(5,030	)		(17,601	)		(14,341	)
REDEEMABLE SERIES A-1 PREFERRED STOCK    DEEMED DIVIDEND		(24,341	)		—			(24,341	)		—
CONVERTIBLE AND REDEEMABLE SERIES A-2    PREFERRED STOCK DIVIDEND		(2,870	)		—			(2,870	)		—
NET LOSS ATTRIBUTABLE TO COMMON STOCKHOLDERS		(64,490	)		(11,713	)		(103,573	)		(26,588	)
WEIGHTED AVERAGE COMMON SHARES    OUTSTANDING— BASIC AND DILUTED		21,554			8,718			13,669			8,640
NET LOSS PER SHARE ATTRIBUTABLE TO COMMON    STOCKHOLDERS— BASIC AND DILUTED	$	(2.99	)	$	(1.34	)	$	(7.58	)	$	(3.08	)

The accompanying notes are an integral part of these unaudited condensed consolidated financial statements.

2

MONTROSE ENVIRONMENTAL GROUP, INC.

UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF REDEEMABLE SERIES A-1 PREFERRED STOCK, CONVERTIBLE AND REDEEMABLE SERIES A-2 PREFERRED STOCK AND STOCKHOLDERS’ EQUITY (DEFICIT)

(In thousands, except share data)

	Redeemable						Convertible and Redeemable															Notes		Accumulated
	Series A-1						Series A-2									Additional						Receivable		Other			Total
	Preferred Stock						Preferred Stock				Common Stock					Paid-In			Accumulated			from		Comprehensive			Stockholders’
	Shares			Amount			Shares		Amount		Shares			Amount		Capital			Deficit			Stockholders		(Loss) Income			Equity (Deficit)
BALANCE—December 31, 2019		12,000		$	128,822			—	$	—		8,370,107		$	—	$	38,153		$	(64,404	)	$	—	$	(40	)	$	(26,291	)
Net loss		—			—			—		—		—			—		—			(41,248	)		—		—			(41,248	)
Accretion of the redeemable    series A-1 preferred stock to    redeemable value		—			5,415			—		—		—			—		(5,415	)		—			—		—			(5,415	)
Stock-based compensation		—			—			—		—		—			—		1,150			—			—		—			1,150
Accumulated other comprehensive    income		—			—			—		—		—			—		—			—			—		37			37
BALANCE—March 31, 2020		12,000		$	134,237			—	$	—		8,370,107		$	—	$	33,888		$	(105,652	)	$	—	$	(3	)	$	(71,767	)
Net income		—			—			—		—		—			—		—			13,224			—		—			13,224
Accretion of the redeemable    series A-1 preferred stock to    redeemable value		—			5,644			—		—		—			—		(5,644	)		—			—		—			(5,644	)
Issuance of the convertible and    redeemable series A-2    preferred stock		—			—			17,500		152,928		—			—		—			—			—		—			—
Stock-based compensation		—			—			—		—		—			—		1,140			—			—		—			1,140
Common stock issued		—			—			—		—		794,639			—		25,021			—			—		—			25,021
Accumulated other comprehensive    loss		—			—			—		—		—			—		—			—			—		(90	)		(90	)
BALANCE—June 30, 2020		12,000		$	139,881			17,500	$	152,928		9,164,746		$	—	$	54,405		$	(92,428	)	$	—	$	(93	)	$	(38,116	)
Net loss		—			—			—		—		—			—		—			(30,737	)		—		—			(30,737	)
Accretion of the redeemable    series A-1 preferred stock to    redeemable value		—			6,542			—		—		—			—		(6,542	)		—			—		—			(6,542	)
Series A-1 preferred stock    deemed dividend		—			24,341			—		—		—			—		(24,341	)		—			—		—			(24,341	)
Redemption of the series A-1		(12,000	)		(170,764	)		—		—		1,786,739			—		26,801			—			—		—			26,801
Dividend payment to the series A-2    preferred shareholders		—			—			—		—		—			—		(2,870	)		—			—		—			(2,870	)
Exercise of the series A-1    preferred stock warrant		—			—			—		—		534,240			—		11,871			—			—		—			11,871
Exercise of the series A-2     preferred stock warrant		—			—			—		—		1,999,999					44,441			—			—		—			44,441
Stock-based compensation		—			—			—		—		—			—		1,149			—			—		—			1,149
Common stock issued		—			—			—		—		26,850			—		150			—			—		—			150
Issuance of common stock    in connection with initial public    offering, net of issuance    costs of $15.6 million		—			—			—		—		11,500,000			—		156,881			—			—		—			156,881
Cancellation of shares		—			—			—		—		(119,452	)		—		—			—			—		—			—
Accumulated other comprehensive    income		—			—			—		—		—			—		—			—			—		80			80
BALANCE—September 30, 2020		—		$	—			17,500	$	152,928		24,893,122		$	—	$	261,945		$	(123,165	)	$	—	$	(13	)	$	138,767

3

MONTROSE ENVIRONMENTAL GROUP, INC.

UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF REDEEMABLE SERIES A-1 PREFERRED STOCK, CONVERTIBLE AND REDEEMABLE SERIES A-2 PREFERRED STOCK AND STOCKHOLDERS’ EQUITY (DEFICIT)

(In thousands, except share data) (continued)

	Redeemable				Convertible and Redeemable														Notes			Accumulated
	Series A-1				Series A-2								Additional						Receivable			Other			Total
	Preferred Stock				Preferred Stock				Common Stock				Paid-In			Accumulated			from			Comprehensive			Stockholders’
	Shares		Amount		Shares		Amount		Shares		Amount		Capital			Deficit			Stockholders			Income (Loss)			Equity (Deficit)
BALANCE—December 31, 2018		12,000	$	109,206		—	$	—		8,137,771	$	—	$	47,869		$	(40,847	)	$	(122	)	$	—		$	6,900
Net loss		—		—		—		—		—		—		—			(5,242	)		—			—			(5,242	)
Accretion of the redeemable    series A-1 preferred stock to    redeemable value		—		4,534		—		—		—		—		(4,534	)		—			—			—			(4,534	)
Stock-based compensation		—		—		—		—		—		—		1,228			—			—			—			1,228
Common stock issued		—		—		—		—		1,775		—		6			—			—			—			6
BALANCE—March 31, 2019		12,000	$	113,740		—	$	—		8,139,546	$	—	$	44,569		$	(46,089	)	$	(122	)	$	—		$	(1,642	)
Net loss		—		—		—		—		—		—		—			(322	)		—			—			(322	)
Accretion of the redeemable    series A-1 preferred stock to    redeemable value		—		4,777		—		—		—		—		(4,777	)		—			—			—			(4,777	)
Stock-based compensation		—		—		—		—		—		—		1,294			—			—			—			1,294
Common stock issued		—		—		—		—		138,781		—		3,452			—			—			—			3,452
Accumulated other comprehensive    income		—		—		—		—		—		—		—			—			—			23			23
BALANCE—June 30, 2019		12,000	$	118,517		—	$	—		8,278,327	$	—	$	44,538		$	(46,411	)	$	(122	)	$	23		$	(1,972	)
Net loss		—		—		—		—		—		—		—			(6,683	)		—			—			(6,683	)
Accretion of the redeemable    series A-1 preferred stock to    redeemable value		—		5,030		—		—		—		—		(5,030	)		—			—			—			(5,030	)
Stock-based compensation		—				—		—		—		—		1,055			—			—			—			1,055
Common stock issued		—		—		—		—		32,558		—		728			—			—			—			728
Accumulated other comprehensive    loss		—		—		—		—		—		—		—			—			—			(20	)		(20	)
BALANCE—September 30, 2019		12,000	$	123,547		—	$	—		8,310,885	$	—	$	41,291		$	(53,094	)	$	(122	)	$	3		$	(11,922	)

The accompanying notes are an integral part of these unaudited condensed consolidated financial statements.

4

MONTROSE ENVIRONMENTAL GROUP, INC.

UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS

(In thousands)

	Nine Months Ended September 30,
	2020			2019
OPERATING ACTIVITIES:
Net loss	$	(58,761	)	$	(12,247	)
Adjustments to reconcile net loss to net cash (used in) provided by operating activities:
Provision for bad debt		6,445			590
Depreciation and amortization		27,084			20,262
Stock-based compensation expense		3,439			3,577
Fair value changes in the contingent put option		(19,240	)		—
Fair value changes in the compound embedded option		27,420			—
Fair value changes in business acquisitions contingent consideration		17,387			(670	)
Fair value changes in the warrant options		9,312			4,059
Deferred income taxes		(1,563	)		(1,308	)
Cloud computing costs		(2,350	)		(247	)
Other		1,170			97
Changes in operating assets and liabilities—net of acquisitions:
Accounts receivable and contract assets		(7,736	)		(2,732	)
Prepaid expenses and other current assets		(1,349	)		(179	)
Accounts payable and other accrued liabilities		(4,829	)		(95	)
Accrued payroll and benefits		6,084			1,440
Payment of contingent consideration and other assumed purchase price obligations		(6,390	)		—
Net cash (used in) provided by operating activities		(3,877	)		12,547
INVESTING ACTIVITIES:
Purchases of property and equipment		(5,366	)		(2,765	)
Proprietary software development		(370	)		(6	)
Proceeds from net working capital adjustment related to acquisitions		2,819			—
Cash paid for acquisitions—net of cash acquired		(173,923	)		(81,370	)
Net cash used in investing activities		(176,840	)		(84,141	)
FINANCING ACTIVITIES:
Proceeds from line of credit		104,390			149,744
Payments on line of credit		(201,980	)		(69,744	)
Proceeds from term loans		175,000			—
Repayment of term loan		(49,297	)		—
Payment of contingent consideration and other purchase price obligations		(6,004	)		(1,136	)
Repayment of capital leases		(2,257	)		(1,304	)
Proceeds from issuance of common stock    in connection with initial public offering, net of issuance costs		161,288			—
Payments of deferred offering costs		(2,925	)		(29	)
Debt issuance costs		(4,866	)		(417	)
Debt extinguishment costs		(351	)		—
Proceeds from issuance of common stock		171			139
Issuance of convertible and redeemable Series A-2 preferred stock and warrant		173,664			—
Redemption of the Series A-1 Preferred Stock		(131,821	)		—
Dividend payment to the Series A-2 shareholders		(2,870	)		—
Exercise of warrant options		25			—
Net cash provided by financing activities		212,167			77,253
CHANGE IN CASH, CASH EQUIVALENTS AND RESTRICTED CASH		31,450			5,659
Foreign exchange impact on cash balance		43			(5	)
CASH, CASH EQUIVALENTS AND RESTRICTED CASH:
Beginning of year		6,884			2,489
End of period	$	38,377		$	8,143
SUPPLEMENTAL DISCLOSURES OF CASH FLOWS INFORMATION:
Cash paid for interest	$	9,368		$	2,689
Cash paid for income tax	$	171		$	878
SUPPLEMENTAL DISCLOSURES OF NON-CASH INVESTING AND FINANCING    ACTIVITIES:
Series A-1 preferred stock deemed dividend—net of return from holders	$	24,341		$	—
Series A-1 preferred stock dividend paid in common shares	$	26,801		$	—
Accrued purchases of property and equipment	$	486		$	932
Property and equipment acquired under capital leases	$	1,753		$	2,757
Accretion of the redeemable series A-1 preferred stock to redeemable value	$	17,601		$	14,341
Common stock issued to acquire new businesses	$	25,000		$	4,047
Acquisitions unpaid contingent consideration	$	58,912		$	5,401
Offering costs included in accounts payable and other accrued liabilities	$	1,237		$	—

The accompanying notes are an integral part of these unaudited condensed consolidated financial statements.

5

Montrose Environmental Group, Inc.

Notes to Unaudited Condensed Consolidated Financial Statements

(In thousands, except share data)

1. DESCRIPTION OF THE BUSINESS AND BASIS OF PRESENTATION

Description of the Business—Montrose Environmental Group, Inc. (“Montrose” or the “Company”) is a corporation formed on November 2013, under the laws of the State of Delaware. The Company has approximately 70 offices across the United States, Canada and Australia and over 1,700 employees. Montrose is highly acquisitive and, as of September 30, 2020, had completed 56 acquisitions since its inception.

Montrose is an environmental services company serving the recurring environmental needs of a diverse client base, including Fortune 500 companies and federal, state and local governments through the following three segments:

Assessment, Permitting and Response—Through its Assessment, Permitting and Response segment, Montrose provides scientific advisory and consulting services to support environmental assessments, environmental emergency response, and environmental audits and permits for current operations, facility upgrades, new projects, decommissioning projects and development projects. Montrose’s technical advisory and consulting offerings include regulatory compliance support and planning, environmental, ecosystem and toxicological assessments and support during responses to environmental disruption. Montrose helps clients navigate regulations at the local, state, provincial and federal levels.

Measurement and Analysis—Through its Measurement and Analysis segment, Montrose’s teams test and analyze air, water and soil to determine concentrations of contaminants as well as the toxicological impact of contaminants on flora, fauna and human health. Montrose’s offerings include source and ambient air testing and monitoring, leak detection and repair (“LDAR”) and advanced analytical laboratory services such as air, storm water, wastewater and drinking water analysis.

Remediation and Reuse—Through its Remediation and Reuse segment, Montrose provides clients with engineering, design, implementation and operations and maintenance (“O&M”) services, primarily to treat contaminated water, remove contaminants from soil or create biogas from waste. The Company does not own the properties or facilities at which it implements these projects or the underlying liabilities, nor does it own material amounts of the equipment used in projects; instead, the Company assists clients in designing solutions, managing projects and mitigating their environmental risks and liabilities at their locations.

Initial Public Offering—On July 27, 2020, the Company completed its initial public offering (“IPO”) of common stock, in which it sold 11,500,000 shares, including 1,500,000 shares issued pursuant to the underwriters full exercise on July 24, 2020 of the underwriters’ option to purchase additional shares, at a price to the public of $15.00 per share, resulting in net proceeds to the Company of approximately $161.3 million after deducting underwriting discounts of $11.2 million. Additionally, the Company offset $4.4 million of deferred IPO costs against IPO proceeds recorded to additional paid in capital. These deferred IPO costs were directly attributable to the IPO offering in accordance with Staff Accounting Bulletin Topic 5: Miscellaneous Accounting. The Company’s common stock began trading on the New York Stock Exchange on July 23, 2020.

Basis of Presentation—The unaudited condensed consolidated financial statements include the operations of the Company and its wholly-owned subsidiaries. These unaudited condensed consolidated financial statements are presented in conformity with accounting principles generally accepted in the United States (“U.S. GAAP”) and have been prepared pursuant to the rules and regulations of the U.S. Securities and Exchange Commission (“SEC”) that permit reduced disclosure for interim periods. The unaudited condensed consolidated financial statements include all accounts of the Company and, in the opinion of management, include all recurring adjustments and normal accruals necessary for a fair statement of the Company’s financial position, results of operations and cash flows for the dates and periods presented. These unaudited condensed consolidated financial statements should be read in conjunction with the Company’s audited financial statements as of and for the year ended December 31, 2019. Results for interim periods are not necessarily indicative of the results to be expected during the remainder of the current year or for any future period. All intercompany transactions, accounts and profits, have been eliminated in the condensed consolidated financial statements.

2. SUMMARY OF NEW ACCOUNTING PRONOUNCEMENTS

Recently Adopted Accounting Pronouncements— The Company qualifies as an emerging growth company as defined in the Jumpstart Our Business Startups Act of 2012 (“JOBS Act”) and therefore intends to take advantage of certain exemptions from various public company reporting requirements, including delaying adoption of new or revised accounting standards until those standards apply to private companies. The Company has elected to use this extended transition period under the JOBS Act. The effective dates shown below reflect the election to use the extended transition period.

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In June 2018, the Financial Accounting Standards Board (“FASB”) issued Accounting Standard Update (“ASU”) 2018-07, Compensation—Stock Compensation: Improvements to Nonemployee Share-Based Payment Accounting. Under the revised guidance, the accounting for awards issued to non-employees will be similar to the accounting for employee awards. The new guidance is effective for fiscal years beginning after December 15, 2019. The standard was adopted as of January 1, 2020 and did not have a material impact on the Company’s condensed consolidated financial statements.

In January 2017, the FASB issued ASU 2017-04, Intangibles—Goodwill and Other (Topic 350): Simplifying the Accounting for Goodwill Impairment. The revised guidance eliminates Step 2 of the current goodwill impairment analysis test, which requires hypothetical purchase price allocation to measure goodwill impairment. A goodwill impairment loss will instead be measured at the amount by which a reporting unit’s carrying amount exceeds its fair value, not to exceed the carrying amount of goodwill. The revised guidance was adopted as of January 1, 2020 and did not have a material impact on the Company’s condensed consolidated financial statements.

Recently Issued Accounting Pronouncements Not Yet Adopted— In August 2020, the FASB issued ASU 2020-06, Debt—Debt with Conversion and Other Options (Subtopic 470-20) and Derivatives and Hedging—Contracts in Entity’s Own Equity (Subtopic 815-40)—Accounting for Convertible Instruments and Contracts in an Entity’s Own Equity. The ASU simplifies accounting for convertible instruments by removing major separation models required under current GAAP. Consequently, more convertible debt instruments will be reported as a single liability instrument with no separate accounting for embedded conversion features. The ASU removes certain settlement conditions that are required for equity contracts to qualify for the derivative scope exception, which will permit more equity contracts to qualify for the exception. The ASU also simplifies the diluted net income per share calculation in certain areas. The new guidance is effective for fiscal years beginning after December 15, 2023, including interim periods within those fiscal years, and early adoption is permitted. The Company is currently evaluating the impact of the adoption of the standard on the condensed consolidated financial statements.

In March 2020, the FASB issued ASU 2020-04, Reference Rate Reform (Topic 848): Facilitation of the Effects of Reference Rate Reform on Financial Reporting. ASU 2020-04 provides optional expedients and exceptions for applying GAAP to contracts, hedging relationships and other transactions affected by the expected transition away from reference rates that are expected to be discontinued, such as LIBOR. ASU 2020-04 was effective upon issuance. The Company may elect to apply the guidance prospectively through December 31, 2022. The Company is currently evaluating the impact of the adoption of the standard on the condensed consolidated financial statements.

In December 2019, the FASB issued ASU 2019-12, Income Taxes (Topic 740): Simplifying the Accounting for Income Taxes. ASU 2019-12 removes certain exceptions to the general principles in ASC 740 and clarifies and amends certain guidance to promote consistent application. ASU 2019-12 is effective for the Company’s annual and interim periods beginning on January 1, 2021, with early adoption permitted. Depending on the amendment, adoption may be applied on a retrospective, modified retrospective or prospective basis. The Company is currently evaluating the impact of the adoption of the standard on the condensed consolidated financial statements and does not anticipate the standard to have a significant impact.

In June 2016, the FASB issued ASU 2016-13, Financial Instruments—Credit Losses (Topic 326). The standard introduces a new model for recognizing credit losses on financial instruments based on an estimate of current expected credit losses and will apply to trade receivables. The new guidance will be effective for the Company’s annual and interim periods beginning after December 15, 2022. The Company is currently evaluating the impact of the adoption of the standard on the condensed consolidated financial statements and does not anticipate the standard to have a significant impact.

In February 2016, the FASB issued ASU 2016-2, Leases (Topic 842), to improve financial reporting regarding leasing transactions. The ASU primarily affects the accounting by the lessee in that it requires a lessee to recognize lease assets and liabilities, initially measured at the present value of the lease payments, on the balance sheets for those leases classified as operating leases under previous guidance. The new leasing standard is effective for the Company’s annual and interim periods beginning after December 15, 2021. The new leasing standard requires modified retrospective transition. The Company is currently evaluating the impact of the adoption of the updated standard on the condensed consolidated financial statements, but anticipates a material increase in assets and liabilities due to the recognition of the required right-of-use asset and corresponding liability for all significant lease obligations that are currently classified as operating leases.

3. REVENUES AND ACCOUNTS RECEIVABLE

The Company’s main revenue sources derive from the following revenue streams:

Assessment, Permitting and Response Revenues—Assessment, Permitting and Response revenues are generated from multidisciplinary environmental consulting services. The majority of the contracts are fixed-price or time and material based.

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Measurement and Analysis Revenues—Measurement and Analysis revenues are generated from emissions sampling, testing and reporting services, leak detection services, ambient air monitoring services and laboratory testing services. The majority of the contracts are fixed-price or time-and-materials based.

Remediation and Reuse Revenues—Remediation and Reuse revenues are generated from O&M services (on biogas and water treatment facilities), as well as remediation, monitoring and environmental compliance services. Services on the majority of O&M contracts are provided under long-term fixed-fee contracts. The majority of the remediation, monitoring and environmental compliance contracts are fixed price or time-and-materials based.

Disaggregation of Revenue—The Company disaggregates revenue by its operating segments. The Company believes disaggregating revenue into these categories achieves the disclosure objectives to depict how the nature, amount, and uncertainty of revenue and cash flows are affected by economic factors. Disaggregated revenue disclosures are provided in Note 19.

Contract Balances—The Company presents contract balances for unbilled receivables (contract assets), as well as customer advances, deposits and deferred revenue (contract liabilities) within contract assets and accounts payable and accrued expenses, respectively, on the condensed consolidated statements of financial position. Amounts are generally billed at periodic intervals (e.g., weekly, bi-weekly or monthly) as work progresses in accordance with agreed-upon contractual terms. The Company utilizes the practical expedient to not adjust the promised amount of consideration for the effects of a significant financing component as the period between when the Company transfers services to a customer and when the customer pays for those services is one year or less. Amounts recorded as unbilled receivables are generally for services the Company is not entitled to bill based on the passage of time. Under certain contracts, billing occurs subsequent to revenue recognition, resulting in contract assets. The Company sometimes receives advances or deposits from customers before revenue is recognized, resulting in contract liabilities.

The following table presents the Company’s contract balances:

	September 30,		December 31,
	2020		2019
Contract assets	$	35,441	$	13,605
Contract liabilities		9,335		3,314

Contracts assets acquired through business acquisitions completed in the nine months ended September 30, 2020 and the twelve months ended December 31, 2019, amounted to $6.5 million and $0.7 million, respectively. Contract liabilities acquired through business acquisitions completed in the nine months ended September 30, 2020 and twelve months ended December 31, 2019, amounted to zero and $2.2 million. Revenue recognized during the three and nine months ended September 30, 2020, included in the contract liabilities balance at December 31, 2019 was $0.5 million and $2.1 million, respectively. The revenue recognized from the contract liabilities consisted of the Company satisfying performance obligations during the normal course of business.

The amount of revenue recognized from changes in the transaction price associated with performance obligations satisfied in prior periods during the three and nine months ended September 30, 2020 was not material.

Remaining Unsatisfied Performance Obligations—Remaining unsatisfied performance obligations represent the total dollar value of work to be performed on contracts awarded and in progress. The amount of remaining unsatisfied performance obligations increases with new contracts or additions to existing contracts and decreases as revenue is recognized on existing contracts. Contracts are included in the amount of remaining unsatisfied performance obligations when an enforceable agreement has been reached. As of September 30, 2020 and December 31, 2019, the estimated revenue expected to be recognized in the future related to performance obligations that are unsatisfied was approximately $25.2 million and $13.0 million, respectively. As of September 30, 2020, the Company expected to recognize approximately $24.0 million of this amount as revenue within the next year and $1.2 million the year after.

Accounts Receivable, Net—Accounts receivable, net as of September 30, 2020 and December 31, 2019 consisted of the following:

	September 30,			December 31,
	2020			2019
Accounts receivable, invoiced	$	52,372		$	46,643
Accounts receivable, other		929			611
Allowance for doubtful accounts		(8,516	)		(1,327	)
Accounts receivable—net	$	44,785		$	45,927

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The Company extends non-interest-bearing trade credit to its customers in the ordinary course of business. Accounts receivable are shown on the face of the condensed consolidated statements of financial position, net of an allowance for doubtful accounts. In determining the allowance for doubtful accounts, the Company analyzes the aging of accounts receivable, historical bad debts, customer creditworthiness and current economic trends. Subsequent to December 31, 2019, there was a global outbreak of a new strain of coronavirus, COVID-19. The COVID-19 pandemic has added uncertainty to the collectability of certain receivables, particularly in industries hard hit by the pandemic. As a result, the Company recorded a $6.3 million bad debt reserve during the first quarter of2020. The bad debt adjustment included a $5.5 million reserve for one customer in the Company’s Remediation and Reuse segment in which management concluded to discontinue select service lines as of March 31, 2020 (Note 19). For all periods presented, no customer accounted for more than 10.0% of revenue or accounts receivable, net.

The allowance for doubtful accounts as of September 30, 2020 and December 31, 2019 consisted of the following:

	Beginning Balance		Bad Debt Expense		Charged to Allowance			Other(1)		Ending Balance
Nine months ended September 30, 2020	$	1,327	$	6,445	$	(294	)	$	1,038	$	8,516
Year ended December 31, 2019		453		1,246		(556	)		184		1,327

(1) This amount consists of additions to the allowance due to business acquisitions.

4. PREPAID AND OTHER CURRENT ASSETS

Prepaid and other current assets as of September 30, 2020 and December 31, 2019 consisted of the following:

	September 30,		December 31,
	2020		2019
Deposits	$	733	$	605
Prepaid expenses		1,665		1,235
Prepaid insurance		2,577		170
Supplies		2,428		2,368
Offering costs		—		1,240
Income tax receivable		1,182		1,205
Prepaid and other current assets	$	8,585	$	6,823

5. PROPERTY AND EQUIPMENT

Property and equipment are stated at cost or estimated fair value for assets acquired through business combinations. Depreciation and amortization is provided using the straight-line method over the estimated useful lives of the assets. Leasehold improvements are amortized using the straight-line method over the shorter of the remaining lease term, including options that are deemed to be reasonably assured, or the estimated useful life of the improvement.

Property and equipment, net, as of September 30, 2020 and December 31, 2019 consisted of the following:

	Estimated	September 30,			December 31,
	Useful Life	2020			2019
Lab and test equipment	7 years	$	17,755		$	14,810
Vehicles	5 years		12,869			11,073
Equipment	3–7 years		31,539			29,922
Furniture and fixtures	7 years		2,854			1,119
Leasehold improvements	7 years		6,758			5,954
Aircraft	10 years		834			—
Building	39 years		2,975			—
			75,584			62,878
Land			725			—
Construction in progress			156			796
Less accumulated depreciation			(41,906	)		(36,638	)
Total property and equipment—net		$	34,559		$	27,036

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Total depreciation expense included on the condensed consolidated statements of operations was $2.1 million and $6.1 million for the three and nine months ended September 30, 2020, respectively. Total depreciation expense included on the condensed consolidated statements of operations was $2.1million and $5.9million for the three and nine months ended September 30, 2019, respectively.

6. BUSINESS ACQUISITIONS

In line with the Company’s strategic growth initiatives, the Company acquired several businesses during the nine months ended September 30, 2020 and September 30, 2019. The results of each of those acquired businesses are included in the condensed consolidated financial statements beginning on the respective acquisition dates. Each transaction qualified as an acquisition of a business and was accounted for as a business combination. All acquisitions resulted in the recognition of goodwill. The Company paid these premiums resulting in such goodwill for a number of reasons, including expected synergies from combining operations of the acquiree and the Company while also growing the Company’s customer base, acquiring assembled workforces, expanding its presence in certain markets and expanding and advancing its product and service offerings. The Company recorded the assets acquired and liabilities assumed at their acquisition date fair value, with the difference between the fair value of the net assets acquired and the acquisition consideration reflected as goodwill.

The identifiable intangible assets for acquisitions are valued using the excess earnings method discounted cash flow approach for customer relationships, the relief from royalty method for trade names, the patent and external proprietary software, the “with and without” method for covenants not to compete and the replacement cost method for the internal proprietary software by incorporating Level 3 inputs as described under the fair value hierarchy of ASC 820. These unobservable inputs reflect the Company’s own assumptions about which assumptions market participants would use in pricing an asset on a non-recurring basis. These assets will be amortized over their respective estimated useful lives.

Other purchase price obligations (primarily deferred purchase price liabilities and target working capital liabilities or receivables) are included on the condensed consolidated statements of financial position in accounts payable and other accrued liabilities, other non-current liabilities or accounts receivable-net in the case of working capital deficits. Contingent consideration outstanding from acquisitions are included on the condensed consolidated statements of financial position in business acquisition contingent consideration, current or in business acquisitions contingent consideration, long-term. These obligations are scheduled to be settled if certain performance thresholds are met.

The Company considers several factors when determining whether or not contingent consideration liabilities are part of the purchase price, including the following: (i) the valuation of its acquisitions is not supported solely by the initial consideration paid, (ii) the former stockholders of acquired companies that remain as key employees receive compensation other than contingent consideration payments at a reasonable level compared with the compensation of the Company’s other key employees and (iii) contingent consideration payments are not affected by employment termination. The Company reviews and assesses the estimated fair value of contingent consideration at each reporting period.

Transaction costs related to business combinations totaled $3.8 million and $2.4 million for the nine months ended September 30, 2020 and September 30, 2019, respectively, and zero and $1.3 million for the three months ended September 30, 2020 and September 30, 2019, respectively. These costs are expensed within the selling, general and administrative expense in the accompanying condensed consolidated statements of operations.

The cash payment made to acquire The Center for Toxicology and Environmental Health, L.L.C. (“CTEH”) was funded through the issuance of the Convertible and Redeemable Series A-2 Preferred Stock (Note 16) and the common stock portion of the purchase price was funded through the issuance of 791,139 shares of common stock. Cash payments made to acquire businesses during the nine months ended September 30, 2019 were funded through the Company’s prior senior secured credit facility (Note 12).

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Acquisitions completed during the nine monthsended September 30, 2020

The Center for Toxicology and Environmental Health, L.L.C.—In April 2020, the Company completed the acquisition of CTEH by acquiring 100% of its membership interests. CTEH is an environmental consulting company headquartered in Arkansas that specializes in environmental response and toxicology. The transaction qualified as an acquisition of a business and is accounted for as a business combination.

Leed Environmental Inc.— In September 2020, the Company acquired certain testing assets, and operations from Leed Environmental Inc. (“LEED”). LEED provides environmental project management and coordination services. LEED expands the Company’s remediation capabilities in the Northeast region of the United States.

American Environmental Testing Co.— In September 2020, the Company acquired certain assets and operations of American Environmental Testing Co. (“AETC”), a stack testing company in Utah. AETC expands the Company’s air measurement and analysis capabilities in the West Coast region.

The following table summarizes the elements of purchase price of the acquisitions completed during the nine months ended September 30, 2020:

	Cash		Common Stock		Other Purchase Price Component Current			Other Purchase Price Component Long Term		Contingent Consideration Current		Contingent Consideration Long Term		Total Purchase Price
CTEH	$	175,000	$	25,000	$	(2,297	)	$	—	$	34,451	$	10,543	$	242,697
All other acquisitions		450		—		50			100		210		—		810
	$	175,450	$	25,000	$	(2,247	)	$	100	$	34,661	$	10,543	$	243,507

The contingent consideration elements of the purchase price of the acquisitions is related to earn-outs which are based on the expected achievement of revenue or earnings thresholds as of the date of the acquisition and for which the maximum potential amount is limited.

CTEH first year earnout is to be calculated at twelve times CTEH’s 2020 EBITDA (as defined in the purchase agreement) in excess of $18.3 million, with a maximum first year earn-out payment of $50.0 million. The second year earn-out is to be calculated at ten times CTEH’s 2021 EBITDA in excess of actual 2020 EBITDA (with actual 2020 EBITDA subject to a minimum of $18.3 million and a maximum of $22.5 million), with a maximum second year earn-out payment of $30.0 million. The 2020 earn out was initially payable 100% in common stock, but as a result of the completion of the Company’s IPO (Note 1), 50% of any 2020 earnout payment will be payable in cash and 50% will be payable, at the Company’s election, in cash or shares of common stock. The 2021 earn out, if any, is payable 100% in cash.

The preliminary purchase price attributable to the acquisitions was allocated as follows:

	CTEH		All Other Acquisitions		Total
Cash	$	1,527	$	—	$	1,527
Accounts receivable		17,059		—		17,059
Other current assets		1,265		—		1,265
Current assets		19,851		—		19,851
Property and equipment		7,042		75		7,117
Customer relationships		56,000		—		56,000
Trade names		4,200		—		4,200
Covenants not to compete		4,000		109		4,109
Proprietary software		14,700		—		14,700
Goodwill		146,625		626		147,251
Total assets		252,418		810		253,228
Current liabilities		9,721		—		9,721
Total liabilities		9,721		—		9,721
Purchase price	$	242,697	$	810	$	243,507

For the acquisitions completed during the nine months ended September 30, 2020, the results of operations have been combined with those of the Company. The Company’s condensed consolidated statement of operations for the three and nine months ended

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September 30, 2020 includes revenue and pre-tax income of $37.2 million and $5.7 million, respectively, related mainly to the CTEH acquisition. CTEH, LEED and AETCare included in the Company’s Assessment, Permitting and Response, Remediation and Reuse and Measurement and Analysis segments, respectively.

The weighted average useful lives for the acquired customer relationships and internal proprietary software for the CTEH acquisition are 15 years and 3 years, respectively. The weighted average useful lives for the acquired tradenames, covenants not to compete and external proprietary software for the CTEH acquisition is 5 years. The weighted average useful lives for the acquired covenants not to compete for the other acquisitions is 4 years.

Goodwill associated with the CTEH, LEED and AETC acquisitions is deductible for income tax purposes.

Acquisitions completed during the nine months ended September 30, 2019

Golden Specialty, Inc.—In March 2019, the Company acquired 100% of the issued and outstanding capital stock of Golden Specialty, Inc. (“Golden”), an air testing laboratory in Texas. Golden expands the Company’s air measurement and analysis capabilities in the Gulf Coast region.

Target Emission Services Inc.—In April 2019, the Company acquired 100% of the issued and outstanding capital stock of Target Emission Services, Inc. (“TES”), an emission detection company in Canada. TES expands the Company’s LDAR business, increasing the geographic footprint in Canada and initiating growth into international markets.

Target Emission Services USA LP—In April 2019, the Company acquired 100% of the issued and outstanding capital stock of Target Emission Services USA LP (now Target Emission Services USA LLC) (“TESUS”), an emission detection company in the United States. TESUS expands the Company’s LDAR business throughout the United States.

Air Water & Soil Laboratories, Inc.—In June 2019, the Company acquired 100% of the issued and outstanding capital stock of Air Water & Soil Laboratories, Inc. (“AWS”), a provider of air, water, and soil testing in the mid-Atlantic region. AWS expands the Company’s air, water, and soil environmental lab services in the East Coast region.

Advanced Environmental Compliance LLC—In July 2019, the Company acquired certain emissions testing assets, employees and customer relationships from Advanced Environmental Compliance LLC (“AEC”). AEC is in the business of providing air quality measurement and analysis services, together with environmental laboratory services. AEC expands the Company’s emissions testing services offering in the West Coast region.

LEHDER Environmental Services Ltd.—In July 2019, the Company acquired 100% of the issued and outstanding capital stock of LEHDER Environmental Services (“LEHDER”), a provider of air quality management services in Canada. LEHDER expands the Company’s international reach and air quality services capabilities in Canada.

Emerging Compounds Treatments Technologies, Inc.—In August 2019, the Company acquired 100% of the issued and outstanding capital stock of Emerging Compounds Treatments Technologies, Inc. (“ECT2”), a provider of novel technologies for removing contaminants/compounds from water and air. ECT2 expands the Company’s water and air treatment capabilities throughout the United States and Australia.

The following table summarizes the elements of purchase price of the acquisitions completed during the nine months ended September 30, 2019:

	Cash		Common Stock		Other Purchase Price Components			Contingent Consideration		Total Purchase Price
Golden	$	1,500		—		—		$	477	$	1,977
TES		2,359		322		25			4,911		7,617
TESUS		18,683		3,041		1,495			—		23,219
AWS		6,020		—		150			—		6,170
AEC		808		—		—			—		808
LEHDER		3,878		684		—			13		4,575
ECT2		54,037		—		(220	)		—		53,817
	$	87,285	$	4,047	$	1,450		$	5,401	$	98,183

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Contingent consideration elements of the purchase price of these acquisitions are related to earn-outs which are based on the expected achievement of revenue or earnings thresholds by the applicable business as of the date of the acquisition and for which the maximum potential amount to be earned is generally not limited.

The purchase price attributable to the acquisitions was allocated as follows:

	ECT2		All Other Acquisitions		Total
Cash	$	3,149	$	2,137	$	5,286
Restricted cash		629		—		629
Accounts receivable		1,707		3,751		5,458
Other current assets		498		61		559
Current assets		5,983		5,949		11,932
Property and equipment		776		3,288		4,064
Customer relationships		13,840		12,748		26,588
Trade names		1,008		659		1,667
Covenants not to compete		3,360		2,083		5,443
Proprietary software		—		2,560		2,560
Patent		17,479		—		17,479
Goodwill		16,395		20,227		36,622
Total assets		58,841		47,514		106,355
Current liabilities		5,024		977		6,001
Non- current liabilities		—		2,171		2,171
Total liabilities		5,024		3,148		8,172
Purchase price	$	53,817	$	44,366	$	98,183

The weighted average useful lives for the acquired customer relationships, trade names, covenants not to compete, proprietary software and patent for these acquisitions are 9.5 years, 1.5 years, 4 years, 3 years and 16 years, respectively.

For the acquisitions completed during the nine months ended September 30, 2019, the results of operations since the acquisition dates have been combined with those of the Company. The Company’s three and nine months ended September 30, 2019 condensed consolidated statement of operations includes revenue of $7.7 million and pre-tax income of $1.5 million, respectively, related to these acquisitions. The Golden, TES, TESUS, AWS, AEC and LEHDER acquisitions are included in the Company’s Measurement and Analysis segment. The ECT2 acquisition is included in the Company’s Remediation and Reuse segment.

Goodwill associated with the acquisitions of Golden, AEC and ECT2 is deductible for income tax purposes.

Supplemental Unaudited Pro-Forma—The unaudited condensed consolidated financial information summarized in the following table gives effect to the 2020 and the 2019 acquisitions discussed above assuming they occurred on January 1, 2019. These unaudited consolidated pro forma operating results do not assume any impact from revenue, cost or other operating synergies that are expected or may have been realized as a result of the acquisitions. These unaudited consolidated pro forma operating results are presented for illustrative purposes only and are not indicative of the operating results that would have been achieved had the acquisitions occurred on January 1, 2019, nor does the information purport to reflect results for any future period.

	For the Three Months Ended September 30,
	2020								2019
	As reported			Acquisitions Pro-Forma (Unaudited)		Consolidated Pro-Forma (Unaudited)			As reported			Acquisitions Pro-Forma (Unaudited)		Consolidated Pro-Forma (Unaudited)
Revenues	$	84,705		$	—	$	84,705		$	57,623		$	18,551	$	76,174
Net (loss) income		(30,737	)		—		(30,737	)		(6,683	)		4,042		(2,641	)

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	For the Nine Months Ended September 30,
	2020								2019
	As reported			Acquisitions Pro-Forma (Unaudited)		Consolidated Pro-Forma (Unaudited)			As reported			Acquisitions Pro-Forma (Unaudited)		Consolidated Pro-Forma (Unaudited)
Revenues	$	219,502		$	31,253	$	250,755		$	165,978		$	107,459	$	273,437
Net (loss) income		(58,761	)		10,288		(48,473	)		(12,247	)		30,002		17,755

7. GOODWILL AND INTANGIBLE ASSETS

Amounts related to goodwill as of September 30, 2020 and December 31, 2019 are as follows:

	Assessment, Permitting and Response		Measurement and Analysis		Remediation and Reuse		Total
Balance as of December 31, 2019	$	15,173	$	68,628	$	43,257	$	127,058
Goodwill acquired during the period		146,625		426		200		147,251
Balance as of September 30, 2020	$	161,798	$	69,054	$	43,457	$	274,309

Amounts related to finite-lived intangible assets as of September 30, 2020 and December 31, 2019 are as follows:

September 30, 2020	Estimated Useful Life	Gross Balance		Accumulated Amortization		Total Intangible Assets—Net
Finite lived intangible assets
Customer relationships	7–15 years	$	164,782	$	49,068	$	115,714
Covenants not to compete	4–5 years		29,942		20,444		9,498
Trade names	1–5 years		16,938		12,196		4,742
Proprietary software	3-5 years		20,808		4,915		15,893
Patent	16 years		17,479		1,125		16,354
Total other intangible assets—net		$	249,949	$	87,748	$	162,201

December 31, 2019	Estimated Useful Life	Gross Balance		Accumulated Amortization		Total Intangible Assets—Net
Finite lived intangible assets
Customer relationships	7–10 years	$	108,782	$	36,700	$	72,082
Covenants not to compete	4–5 years		25,832		17,572		8,260
Trade names	1–5 years		12,738		10,230		2,508
Proprietary software	3 years		3,885		1,359		2,526
Patent	16 years		17,479		306		17,173
Total other intangible assets—net		$	168,716	$	66,167	$	102,549

Intangible assets with finite lives are stated at cost, less accumulated amortization and impairment losses, if any. These intangible assets are amortized using the straight-line method over the estimated useful lives of the assets.

Amortization expense was $7.6 million and $21.0 million for the three and nine months ended September 30, 2020, respectively and $5.3 million and $14.4 million for the three and nine months ended September 30, 2019, respectively.

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Future amortization expense is estimated to be as follows for each of the five following years and thereafter:

December 31,
2020 (remaining)	$	7,543
2021		28,140
2022		24,053
2023		20,073
2024		16,951
Thereafter		65,441
	$	162,201

8. ACCOUNTS PAYABLE AND OTHER ACCRUED LIABILITIES

Accounts payable and other accrued liabilities consisted of the following as of September 30, 2020 and December 31, 2019:

	September 30,		December 31,
	2020		2019
Accounts payable	$	13,360	$	15,034
Accrued expenses		10,395		10,733
Other purchase obligations		572		—
Contract liabilities		9,335		3,314
Other current liabilities		235		504
Total accounts payable and other accrued liabilities	$	33,897	$	29,585

9. ACCRUED PAYROLL AND BENEFITS

Accrued payroll and benefits consisted of the following as of September 30, 2020 and December 31, 2019:

	September 30,		December 31,
	2020		2019
Accrued bonuses	$	7,854	$	3,449
Accrued paid time off		2,157		2,154
Accrued payroll		5,536		4,470
Accrued other		2,410		959
Total accrued payroll and benefits	$	17,957	$	11,032

10. INCOME TAXES

The Company calculates its interim income tax provision in accordance with Accounting Standard Codification Topic 270, Interim Reporting (“ASC 270”), and ASC 740. The Company’s effective tax rate (“ETR”) from continuing operations was (12.2%) and 5.8% for the three months ended September 30, 2020 and September 30, 2019, respectively, and 2.6% and 9.6% for the nine months ended September 30, 2020 and September 30, 2019, respectively, and the Company recorded income tax expense/(benefit) of $3.3 million and $(0.4) million for the three months ended September 30, 2020 and September 30, 2019, respectively, and income tax benefits of $1.6 million and $1.3 million for the nine months ended September 30, 2020 and September 30, 2019, respectively. The difference between the ETR and federal statutory rate of 21.0% is primarily attributable to items recorded for GAAP but permanently disallowed for U.S. federal income tax purposes, recognition of a US federal and state valuation allowance, state and foreign income tax provisions and Global Intangible Low Taxed Income (“GILTI”).

A valuation allowance is recorded when it is more-likely-than-not some of the Company’s deferred tax assets may not be realized. Significant judgment is applied when assessing the need for a valuation allowance and the Company considers future taxable income, reversals of existing deferred tax assets and liabilities and ongoing prudent and feasible tax planning strategies, in making such assessment. As of September 30, 2020, the Company determined its US federal and state net deferred tax assets are not more-likely-than-not to be realized and recorded a valuation allowance of $7.4 million against the net deferred tax assets.

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The Company records uncertain tax positions in accordance with ASC 740, Income Taxes, on the basis of a two-step process in which (i) the Company determines whether it is more likely than not a tax position will be sustained on the basis of the technical merits of such position and (ii) for those tax positions meeting the more-likely-than-not recognition threshold, the Company would recognize the largest amount of tax benefit that is more than 50.0% likely to be realized upon ultimate settlement with the related tax authority. The Company has determined it has no uncertain tax positions as of September 30, 2020. The Company classifies interest and penalties recognized on uncertain tax positions as a component of income tax expense.

On March 27, 2020, the Coronavirus Aid, Relief, and Economic Security Act (“CARES Act”) was enacted. The CARES Act includes several significant provisions for corporations, including those pertaining to net operating losses, interest deductions and payroll tax benefits. Under ASC 740, the effects of new legislation are recognized upon enactment. Accordingly, the effects of the CARES Act have been incorporated into the income tax provision computation for the nine months ended September 30, 2020. These provisions did not have a material impact on the income tax provision. The Company anticipates deferring the employer side social security payments for payroll paid for the remainder of 2020 as permitted by the CARES Act.

11. WARRANT OPTIONS

In October 2018, in connection with the issuance of the Redeemable Series A-1 Preferred Stock, the Company issued a detachable warrant to acquire 534,240 shares of common stock at a price of $0.01 per share at any given time during a period of ten years beginning on the instrument’s issuance date.

On July 30, 2020, the Redeemable Series A-1 Preferred Stock warrant was exercised in full resulting in the issuance of 534,240 shares of common stock to the holder, for an exercise price of $0.01 per share. The fair value of this warrant was determined to be $11.9 million and $16.9 million immediately before the exercise of the warrant option and as of December 31, 2019, respectively. Fair value gains/(losses) recorded in other expense on the condensed consolidated statements of operations were $5.0 million for the three and nine months ended September 30, 2020 and $(2.5) million and $(4.1) million for the three and nine months ended September 30, 2019, respectively.

In April 2020, in connection with the issuance of the Convertible and Redeemable Series A-2 Preferred Stock, the Company issued a detachable warrant to acquire 1,351,960 shares of common stock at a price of $0.01 per share at any time following the occurrence of a qualifying IPO, a sale of the Company, or a redemption in full of the Series A-2 preferred stock (each, an “Adjustment Event”), with an expiration date of ten years from the instrument’s issuance date. The number of shares underlying the warrant and issuable upon exercise was subject to adjustment based upon the price per share of common stock upon the occurrence of an Adjustment Event (Note 16) to reflect an aggregate value of $30.0 million.

As a result of the $15.00 per share public offering price in the IPO, the warrant issued in connection with the issuance of the Convertible and Redeemable Series A-2 Preferred Stock was adjusted pursuant to its terms and, upon closing of the IPO, represented a warrant to purchase 1,999,999 shares of common stock (an increase of 648,039 shares).

On July 30, 2020, the Convertible and Redeemable Series A-2 Preferred Stock warrant was exercised in full resulting in the issuance of 1,999,999 shares of common stock to the holder, for an exercise price of $0.01 per share. The fair value of this warrant was determined to be $44.4 million immediately before the exercise of the warrant option. Fair value loss recorded in other expense on the condensed consolidated statements of operations was $14.3 million for the three and nine months ended September 30, 2020.

12. DEBT

Debt as of September 30, 2020 and December 31, 2019 consisted of the following:

	September 30,			December 31,
	2020			2019
Term Loan Facility	$	174,453		$	48,750
Revolving Line of Credit		—			97,590
Capital leases		3,127			3,765
Other leases		2			12
Equipment line of credit		3,214			3,124
Less deferred debt issuance costs		(4,345	)		(1,052	)
Total debt		176,451			152,189
Less current portion of long term debt		(5,034	)		(7,143	)
Long-term debt, less current portion	$	171,417		$	145,046

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Deferred Financing Costs—Costs relating to debt issuance have been deferred and are presented as discounted against the underlying debt instrument. These costs are amortized to interest expense over the terms of the underlying debt instruments.

Revolving Line of Credit and Term Loan Facility— On April 13, 2020, the Company entered into a Unitranche Credit Agreement (the “New Credit Facility”) providing for a new $225.0 million credit facility comprised of a $175.0 million term loan and a $50.0 million revolving credit facility and repaid all amounts outstanding under the prior senior secured credit facility. The New Credit Facility matures in April 2025. As of September 30, 2020, the term loan and the revolver bore interest at LIBOR plus 5.0% with a 1.0% LIBOR floor or the base rate plus 4.0% and LIBOR plus 3.5% or the base rate plus 2.5%, respectively. See Note 22 regarding an amendment to the New Credit Facility reducing the interest rates on the term loan. The revolver is also subject to an unused commitment fee of 0.35%. The Term Loan has quarterly repayments starting on September 30, 2020 of $0.5 million, increasing to $1.1 million on September 30, 2021 and further increasing to $1.6 million on September 30, 2022, with the remaining outstanding principal amount due on the maturity date. The Company has the option to borrow incremental term loans up to an aggregate principal amount of $100.0 million subject to satisfaction of certain conditions, including the borrower’s pro forma compliance with the financial covenants under the New Credit Facility. Immediately after giving effect to the incurrence of any such incremental term loans, the unitranche lenders must collectively hold at least 70.0% of all pari passu debt of all lenders under the credit facility. The existing lenders are not obligated to participate in any incremental term loan facility.

The New Credit Facility includes a number of covenants imposing certain restrictions on the Company’s business, including, among other things, restrictions on the Company’s ability to incur indebtedness, prepay or amend other indebtedness, create liens, make certain fundamental changes including mergers or dissolutions, pay dividends and make other payments in respect of capital stock, make certain investments, sell assets, change the Company’s lines of business, enter into transactions with affiliates and other corporate actions. The New Credit Facility also contains financial covenants requiring the Company to remain below a maximum consolidated total leverage ratio of 4.25 times, which steps down to 4.00 times beginning December 31, 2021 and then to 3.75 times beginning December 31, 2022, and a minimum consolidated fixed charge coverage ratio of 1.25 times. The New Credit Facility contains mandatory prepayment features upon a number of events, including with the proceeds of certain asset sales, proceeds from the issuance of any debt and proceeds of the capital contribution amounts contributed to cure a financial covenant default. The New Credit Facility also includes mandatory prepayments of 50.0% of excess cash flow minus voluntary prepayments of the term loan and, solely to the extent accompanied by a permanent reduction in the revolving commitment, the revolver, if the Company’s consolidated total leverage ratio for the year ending December 31, 2020 is greater than or equal to 3.25 times and, for any year thereafter, the amount of any such mandatory prepayment shall be reduced to 25.0% of excess cash flow if the leverage ratio is less than 3.00 times.

The weighted average interest rate on the New Credit Facility as of September 30, 2020 was 6.0%.

The New Credit Facility contains a number of customary events of default related to, among other things, the non-payment of principal, interest or fees, violations of covenants, inaccuracy of representations or warranties, certain bankruptcy events, default in payment under or the acceleration of other indebtedness and certain change of control events. In the event of a default, subject to varying cure periods and rights for certain events of default, the required lenders may, at their option, declare the commitments to fund the credit facility to be terminated.

The Company’s obligations under the credit facility are guaranteed by certain of the Company’s existing and future direct and indirect subsidiaries, and such obligations are secured by substantially all of the Company’s assets, including the capital stock or other equity interests in those subsidiaries.

Prior Senior Secured Credit Facility—As of December 31, 2019, the Company’s Prior Senior Secured Credit Facility (the “Prior Senior Credit Facility”) consisted of a $50.0 million term loan and a $130.0 million revolving credit facility.

Borrowings under the Credit Facility bore interest at either (i) LIBOR plus the applicable margin or (ii) a base rate (equal to the highest of (a) the federal funds rate plus 0.5%, (b) Lender A’s prime rate and (c) Eurodollar Rate, which is based on LIBOR, (using a one-month period plus 1.0%), plus the applicable margin, as the Company elects. The applicable margin means a percentage per annum determined in accordance with the following table as of December 31, 2019:

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Pricing Tier	Consolidated Leverage Ratio	Commitment Fee			Eurodollar Rate Loans and LIBOR Letter of Credit Fee			Daily Floating Rate Loans			Rate Loans
1	> 3.75 to 1.0		0.50	%		4.00	%		4.00	%		3.00	%
2	≤ 3.75 to 1.0 but > 3.00 to 1.0		0.50			3.50			3.50			2.50
3	≤ 3.00 to 1.0 but > 2.25 to 1.0		0.40			3.00			3.00			2.00
4	< 2.25 to 1.0		0.30			2.50			2.50			1.50

As of December 31, 2019, the Company fell within Pricing Tier 2 and the Company was subject to a fixed charge coverage ratio of greater than 1.25 and a consolidated total leverage ratio of lower than 4.00.

The Prior Senior Secured Credit Facility was repaid in full on April 13, 2020 via proceeds from the issuance of the New Credit Facility. The resulting loss on extinguishment amounted to $1.4 million, of which $0.4 million was related to fees paid and $1.0 million related to unamortized debt issuance costs. Total loss on extinguishment is recorded in interest expense-net within the condensed consolidated statement of operations for the nine months ended September 30, 2020.

Equipment Line of Credit—On March 12, 2019, the Company increased its equipment line of credit facility for the purchase of equipment and related freight, installation costs and taxes paid for an additional amount not to exceed $2.0 million. On May 16, 2019, the Company entered into a Canadian equipment line of credit facility for an amount not to exceed $1.0 million Canadian dollars. Interest on the line of credit is determined based on a three-year swap rate at the time of funding.

Capital Lease Obligations—The assets and liabilities under capital lease agreements are recorded at the lower of the present value of the minimum lease payments or the fair value of the asset. The assets are being amortized over the shorter of their related lease terms or their estimated useful lives ranging from four to six years. The gross amount of assets under capital leases as of September 30, 2020 and December 31, 2019 was $6.3 million and $6.9 million, respectively. The amortization of assets under capital leases was $0.6 million and $1.6 million for the three and nine months ended September 30, 2020, respectively and $0.4 million and $1.0 million for the three and nine months ended September 30, 2019, respectively and was included in depreciation and amortization on the condensed consolidated statements of operations. All capital leases (including those purchased through the Company’s equipment line of credit) mature by 2025 as follows:

September 30,	Payments		Interest		Principal
2021	$	2,670	$	368	$	2,302
2022		2,178		265		1,913
2023		1,582		139		1,443
2024		667		32		635
2025		49		1		48
	$	7,146	$	805	$	6,341

The following is a schedule of the aggregate annual maturities of long-term debt presented on the condensed consolidated statement of financial position, based on the terms of the credit facility, capital lease obligations and equipment line of credit as of September 30, 2020:

September 30,
2021	$	5,034
2022		6,839
2023		8,006
2024		7,198
2025		153,719
Total	$	180,796

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13. FAIR VALUE OF FINANCIAL INSTRUMENTS

As of September 30, 2020 and December 31, 2019, the following financial liabilities are measured at fair value on a recurring basis using significant unobservable inputs (Level 3).

	September 30,		December 31,
	2020		2019
Business acquisitions contingent consideration, current	$	49,170	$	8,614
Business acquisitions contingent consideration, long-term		9,742		379
Contingent put option		—		7,100
Warrant option		—		16,878
Conversion option		18,059		—
Total	$	76,971	$	32,971

The estimated fair value amounts shown above are not necessarily indicative of the amounts that the Company would realize upon disposition, nor do they indicate the Company’s intent or ability to dispose of the financial instrument.

The following table sets forth the Company’s financial instruments that were measured at fair value on a recurring basis for the nine months ended September 30, 2020 and September 30, 2019:

	Level 3
	Embedded Option			Business Acquisitions Contingent Consideration, Current(1)			Business Acquisitions Contingent Consideration, Long-term(2)			Contingent Put Option			Warrant Options			Total
Balance—at December 31, 2018	$	—		$	2,754		$	—		$	—		$	12,818		$	15,572
Acquisitions					31			—			—			—			31
Changes in fair value included in earnings		—			(670	)		—			—			4,059			3,389
Payment of contingent consideration         payable		—			(554	)		—			—			—			(554	)
Balance—at September 30, 2019	$	—		$	1,561		$	—		$	—		$	16,877		$	18,438
Balance—at December 31, 2019	$	—		$	8,614		$	379		$	7,100		$	16,878		$	32,971
Foreign currency translation of contingent        consideration payment		—			(208	)		—			—			—			(208	)
Payment of contingent consideration        payable		—			(12,464	)		—			—			—			(12,464	)
Acquisitions					34,661			10,543									45,204
Series A-2 compound embedded option		(9,361	)		—			—			—			—			(9,361	)
Issuance of warrant option		—			—			—			—			30,097			30,097
Reclass of long term to short term contingent       liabilities		—			180			(180	)		—			—			—
Changes in fair value included in earnings		27,420			18,387			(1,000	)		(19,240	)		9,312			34,879
Write off of the contingent put option		—			—			—			12,140			—			12,140
Exercise of warrant options		—			—			—			—			(56,287	)		(56,287	)
Balance—at September 30, 2020	$	18,059		$	49,170		$	9,742		$	—		$	—		$	76,971

(1) Current portion of the contingent consideration is recorded in business acquisitions contingent consideration, current.

(2) Long term portion of the contingent consideration is recorded in business acquisitions contingent consideration, long-term.

Quantitative Information about Assets and Liabilities Measured at Fair Value on a Recurring Basis Using Significant Unobservable Inputs (Level 3):

Business Acquisitions Contingent Consideration—The fair value of the contingent consideration payable associated with the acquisition of CTEH was determined using a Monte Carlo simulation of earnings in a risk-neutral Geometric Brownian Motion

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framework.The fair values of the contingent consideration payables for the other acquisitions were calculated based on expected target achievement amounts, which are measured quarterly and then subsequently adjusted to actuals at the target measurement date.

The method used to price these liabilities is considered level 3 due to the subjective nature of the unobservable inputs used to determine the fair value. The input is the expected achievement of earnout thresholds.

Conversion Option—The fair value of the embedded derivative associated with the issuance of the Convertible and Redeemable Series A-2 Preferred Stock (Note 16) was estimated using a “with-and-without” method. The “with-and-without” methodology considers the value of the security on an as-is basis and then without the embedded conversion premium. The difference between the two scenarios is the implied fair value of the embedded derivative. The unobservable input is the required rate of return on the Series A-2. The considerable quantifiable inputs in the valuation relate to the timing of conversions or redemptions.

Contingent Put Option—The fair value of the contingent put option associated with the issuance of the Redeemable Series A-1 Preferred Stock was estimated using a “with-and-without” method. The “with-and-without” methodology considers the value of the security on an as-is basis and then without the embedded contingent put option. The difference between the two scenarios is the implied fair value of the embedded derivative, recorded as the contingent put option liability. In this case the Series A-1 was redeemed on the date of value so the value of the “with” scenario is known. The unobservable input is the required rate of return on the Series A-1 through to maturity in the “without” scenario. The contingent put option was redeemed in July 2020 (Note 15).

Warrant Options—The warrant options were exercised on July 30, 2020 (Note 11). The fair value of the warrant options associated with the issuance of the Redeemable Series A-1 Preferred Stock and the Convertible and Redeemable Series A-2 Preferred Stock was calculated based on the Black-Sholes pricing model using the following assumptions:

	July 30,			September 30,
Series A-1 Preferred Stock Warrant Option	2020			2019
Common stock value (per share)	$	22.22		$	31.60
Expected volatility		44.35	%		47.63	%
Risk-free interest rate		0.55	%		1.68	%
Expected life (years)		10			10
	July 30,			September 30,
Series A-2 Preferred Stock Warrant Option	2020			2019
Common stock value (per share)	$	22.22		n/a
Expected volatility		44.35	%	n/a
Risk-free interest rate		0.55	%	n/a
Expected life (years)		10		n/a

The method used to price these liabilities is considered Level 3 due to the subjective nature of the unobservable inputs (common stock value and expected volatility) used to determine the fair value.

14. COMMITMENTS AND CONTINGENCIES

Operating Leases—The Company leases office facilities over various terms expiring through 2028. Certain of these operating leases contain rent escalation clauses. The Company also has office equipment leases that expire through 2025. The following is a schedule of the future minimum lease payments by year under the leases as of September 30, 2020:

September 30,	Rent		Office Equipment		Total
2021	$	5,863	$	332	$	6,195
2022		4,865		327		5,192
2023		2,961		129		3,090
2024		1,410		39		1,449
2025 and thereafter		1,385		1		1,386
	$	16,484	$	828	$	17,312

Total rent expense under operating leases was $2.2 and $6.4 for the three and nine months ended September 30, 2020, respectively, and $2.0 and $5.6 for the three and nine months ended September 30, 2019, respectively

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Other Commitments—The Company has commitments under the New Credit Facility, its equipment line of credit and its capital lease obligations (Note 12).

Contingencies—The Company is subject to purchase price contingencies related to earn-outs associated with certain acquisitions (Note 6).

Legal—In the normal course of business, the Company is at times subject to pending and threatened legal actions. In management’s opinion, any potential loss resulting from the resolution of these matters is not expected to have a material effect on the condensed consolidated results of operations, financial position or cash flows of the Company.

15. REDEEMABLE SERIES A-1 PREFERRED STOCK

On October 19, 2018, the Company issued 12,000 shares of Redeemable Series A-1 Preferred Stock with a par value of $0.0001 per share and a detachable warrant to purchase 534,240 shares of the Company’s common stock. Each preferred share was issued as part of a unit, which consisted of one share of the Redeemable Series A-1 Preferred Stock at $0.01 million per share.

On April 13, 2020, the Company amended and restated the certificate of designation of the Company’s Redeemable Series A-1 Preferred Stock. The most significant changes in the amendment included (i) the Redeemable Series A-1 Preferred Stock became pari passu with the Convertible and Redeemable Series A-2 Preferred Stock (Note 16), (ii) the maturity was extended to October 2024; (iii) the Company could use up to $50.0 million of indebtedness or cash on hand to redeem the Redeemable Series A-1 Preferred Stock, and (iv) upon an IPO, up to 50.0% of accumulated dividends could be paid in shares of common stock and (v) the Company could elect to reduce the three year make whole penalty to a two year make whole penalty if the warrant issued in connection with the issuance of the Redeemable Series A-1 Preferred Stock was redeemed in full at a share price of no less than $31.60. Following a partial redemption of outstanding Redeemable Series A-1 Preferred Stock, the dividend rate of the remaining Redeemable Series A-1 Preferred Stock would be reduced proportionally (between 15.0% and 9.0%) in relation to the proportion of Redeemable Series A-1 Preferred Stock redeemed, with the rate increasing by an additional 1.0% for dividends that are accrued versus paid in cash. Based on a qualitative assessment performed by the Company, the Redeemable Series A-1 Preferred Stock amendments did not represent a significant long-term change to the original terms of the instrument and, therefore, there was no change in the accounting of the instrument.

On July 27, 2020, the Company redeemed in full the Redeemable Series A-1 Preferred Stock, including the guaranteed minimum two-year dividend. The Company used $131.8 million of the IPO proceeds and 1,786,739 shares of common stock to redeem all outstanding shares of the Company’s Redeemable Series A-1 Preferred Stock. The total accreted value immediately prior to redemption was $40.8 million. The difference between the fair value of the consideration transferred to the holder of the Series A-1 Preferred Stock and the instrument’s carrying value immediately before the redemption of $24.3 million, was treated as a deemed dividend to the holder.

The Redeemable Series A-1 Preferred Stock contained restrictive covenants. As of December 31, 2019, the Company was subject to a consolidated total leverage ratio (including the outstanding principal and accrued dividend on the Redeemable Series A-1 Preferred Stock) limit of less than 10.0 times as of the end of any fiscal quarter ending until maturity. The Company was in compliance with the covenants as of December 31, 2019.  

Before redemption, the Redeemable Series A-1 Preferred Stock accrued dividends quarterly at an annual rate of 15.0% with respect to dividends that were paid in cash and at an annual rate of 14.2% with respect to dividends that were accrued. Total accrued and unpaid dividends as of December 31, 2019 were $21.9 million.

At issuance the Company determined that the detachable warrant (Note 11) and the contingent put option were required to be accounted for separately. As of July 27, 2020 and December 31, 2019, the contingent put option issued in connection with the Redeemable Series A-1 Preferred Stock had a fair value of $12.1 million and $7.1 million, respectively. The change in value of $26.3 million and $19.2 million for the three and nine months ended September 30, 2020 was recorded to other expense.

As of September 30, 2019, the Company determined that the fair value of the contingent put option related to the Redeemable Series A-1 Preferred Stock was immaterial as the probability of the feature being exercised was considered remote.

16. CONVERTIBLE AND REDEEMABLE SERIES A-2 PREFERRED STOCK

On April 13, 2020, the Company entered into an agreement to issue 17,500 shares of the Convertible and Redeemable Series A-2 Preferred Stock with a par value of $0.0001 per share and a detachable warrant to purchase shares of the Company’s common stock with a 10-year life, in exchange for gross proceeds of $175.0 million, net of $1.3 million debt issuance costs. Before the Company’s

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IPO, each share of Convertible and Redeemable Series A-2 Preferred Stock accrued dividends at the rate of 15.0% per annum, with respect to dividends that were paid in cash, and 14.2% per annum, with respect to dividends that were accrued. The Company paid dividends on shares of the Convertible and Redeemable Series A-2 Preferred Stock of $2.9 million during the three and nine months ended September 30, 2020.

At issuance, the Company determined that Convertible and Redeemable Series A-2 Preferred Stock and the detachable warrant (Note 11), were required to be accounted for separately.

Upon the Company’s IPO, following which the Redeemable Series A-1 Preferred Stock was fully redeemed, the Convertible and Redeemable Series A-2 Preferred Stock terms automatically updated to the following: (i) no mandatory redemption, (ii) no stated value cash repayment obligation other than in the event of certain defined liquidation events, (iii) only redeemable at the Company’s option, (iv) the instrument became convertible into common stock beginning on the four year anniversary of issuance at a 15.0% discount to the common stock market price (with a limit of $60.0 million in stated value of Convertible and Redeemable Series A-2 Preferred Stock eligible to be converted in any 60-day period prior to the seventh anniversary of issuance and the amount of stated value of the Convertible and Redeemable Series A-2 Preferred Stock eligible for conversion limited to $60.0 million during year 5 and $120.0 million (which includes the aggregate amount of the stated value of the Convertible and Redeemable Series A-2 Preferred Stock and any accrued but unpaid dividends added to such stated value of any shares of Convertible and Redeemable Series A-2 Preferred Stock converted in year 5) during year 6), (v) the dividend rate stepped down to 9.0% per year with required quarterly cash payments, (vi) in an event of noncompliance, the dividend rate shall increase to 12.0% per annum for the first 90-day period from and including the date the noncompliance event occurred, and thereafter shall increase to 14.0% per annum, (vii) the debt incurrence test ratio increased to 4.5 times, (viii) the total leverage cap covenant was removed, and (ix) minimum repayment amount dropped down from $50.0 million to $25.0 million.

The Company may, at its option on any one or more dates, redeem all or a minimum portion (the lesser of (i) $25.0 million in aggregate stated value of the Convertible and Redeemable Series A-2 Preferred Stock and (ii) all of the Convertible and Redeemable Series A-2 Preferred Stock then outstanding) of the outstanding Convertible and Redeemable Series A-2 Preferred Stock in cash. In the event the Company redeems all or a portion of the Convertible and Redeemable Series A-2 Preferred Stock prior to the three year anniversary of the issuance date, such redemption amount shall include stated value, accrued but unpaid dividends and a make whole payment such that the aggregate redemption amount reflects three years of dividends.

With respect to any redemption of any share of the Convertible and Redeemable Series A-2 Preferred Stock prior to the third-year anniversary, the Company is subject to a make whole penalty in which the holders of the Convertible and Redeemable Series A-2 Preferred Stock are guaranteed a minimum repayment equal to outstanding redeemed stated value plus three years of dividends accrued or accruable thereon.

The Convertible and Redeemable Series A-2 Preferred Stock does not meet the definition of a liability pursuant to “ASC 480- Distinguishing Liabilities from Equity.” However, as (i) the instrument is redeemable upon a change of control as defined in the certificate of designations governing the terms of the Convertible and Redeemable Series A-2 Preferred Stock, and (ii) the Company cannot assert it would have sufficient authorized and unissued shares of common stock to settle all future conversion requests due to the variable conversion terms, the instrument is redeemable upon the occurrence of events that are not solely within the control of the Company, and therefore the Company classifies the Convertible and Redeemable Series A-2 Preferred Stock as mezzanine equity. Subsequent adjustment of the carrying value of the instrument is required if the instrument is probable of becoming redeemable. As of September 30, 2020, the Company has determined that a change of control is not probable. Additionally, as of September 30, 2020, the Company has determined that it is not probable that there will be a future conversion request that the Company is unable to settle with authorized and issued shares based on the Company’s current stock price and available shares as well as the Company’s monitoring efforts to ensure there are a sufficient number of shares available to settle any conversion request. Therefore, as of September 30, 2020, the Company has determined that the instrument is not probable of becoming redeemable, and does not believe subsequent adjustment of the carrying value of the instrument will be necessary. The Convertible and Redeemable Series A-2 Preferred Stock had an aggregate liquidation preference of $182.2 million as of September 30, 2020.

The Convertible and Redeemable Series A-2 Preferred Stock contains embedded features that are required to be bifurcated and are subject to separate accounting treatment from the instrument itself. At issuance, these embedded features consisted of (i) a contingent dividend feature associated with the decrease in the dividend rate upon an IPO and (ii) a conversion option of the preferred shares to shares of common stock beginning on the fourth-year anniversary of the issuance date. Upon the Company’s IPO, the embedded derivative only consisted of the conversion option. As of September 30, 2020, this conversion embedded feature had a net fair value of $18.1 million. The change in value of $26.7 million and $27.4 million for the three and nine months ended September 30, 2020 was recorded to other expense.

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17. STOCKHOLDERS’ EQUITY (DEFICIT)

Authorized Capital Stock—The Company was authorized to issue 190,000,000 and 25,000,000 shares of common stock, with a par value of $0.000004 per share as of September 30, 2020 and December 31, 2019, respectively.

Warrants—In May 2015, the Company issued warrants to acquire 116,350 shares of Common Stock at a price of approximately $17.19 per share to the placement agent as consideration for backstopping the financing completed in May 2015. There were no changes related to these warrants during the three and nine months ended September 30, 2020 and September 30, 2019.

Common Stock Issuances and Cancellations—During the three and nine months ended September 30, 2020 and September 30, 2019, the Company issued and cancelled the following shares of common stock:    

	Three Months Ended September 30,									Nine Months Ended September 30,
	2020					2019				2020					2019
	Shares			Average Price per Share		Shares		Average Price per Share		Shares			Average Price per Share		Shares		Average Price per Share
Common stock issued    in connection with initial public    offering		11,500,000		$	15.00		—	$	—		11,500,000		$	15.00		—	$	—
Acquisitions		—			—		25,408		26.90		791,139			31.60		150,439		22.41
Redemption of series A-1 preferred stock		1,786,739			15.00		—		—		1,786,739			15.00		—		—
Exercise of warrant options		2,534,239			0.01		—		—		2,534,239			0.01		—		—
Exercise of options		16,850			8.92		7,150		6.03		20,350			9.27		22,675		18.01
Restricted shares, net		8,333			24.00		—		—		8,333			24.00		—		—
Cancellation of shares		(117,785	)		17.15		—		—		(117,785	)		17.15		—		—
		15,728,376		$	12.82		32,558	$	22.32		16,523,015		$	13.72		173,114	$	21.83

Employee Equity Incentive Plans—The Company has two plans under which stock-based awards have been issued: (i) the Montrose Amended & Restated 2017 Stock Incentive Plan (“2017 Plan”) and (ii) the Montrose Amended & Restated 2013 Stock Option Plan (“2013 Plan”) (collectively the “Plans”).

As of September 30, 2020 and September 30, 2019, there was $10.4 million and $6.7 million, respectively, of total unrecognized stock compensation expense related to unvested options and restricted stock granted under the Plans. Such unrecognized expense is expected to be recognized over the next two years. The following number of shares were authorized to be issued and available for grant as of September 30, 2020 and September 30, 2019:

	September 30, 2020
	2017 Plan		2013 Plan
Shares authorized to be issued		2,945,443		2,047,269
Shares available for grant		1,233,266		—
	September 30, 2019
	2017 Plan		2013 Plan
Shares authorized to be issued		981,800		2,074,604
Shares available for grant		159,428		—

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Total stock compensation expense for the Plans was as follows:

	Three Months Ended September 30,
	2020									2019
	2017 plan				2013 plan					2017 plan				2013 plan
	Options		Restricted Stock		Options			Total		Options		Restricted Stock		Options		Total
Cost of revenue	$	276	$	—	$	(5	)	$	271	$	278	$	—	$	97	$	375
Selling, general and administrative expense		592		233		53			878		185		111		384		680
	$	868	$	233	$	48		$	1,149	$	463	$	111	$	481	$	1,055

	Nine Months Ended September 30,
	2020								2019
	2017 plan				2013 plan				2017 plan				2013 plan
	Options		Restricted Stock		Options		Total		Options		Restricted Stock		Options		Total
Cost of revenue	$	973	$	—	$	126	$	1,099	$	623	$	—	$	390	$	1,013
Selling, general and administrative expense		1,178		973		189		2,340		457		323		1,784		2,564
	$	2,151	$	973	$	315	$	3,439	$	1,080	$	323	$	2,174	$	3,577

Montrose Amended & Restated 2017 Stock Incentive Plan

Restricted Stock—During the nine months ended September 30, 2020 and September 30, 2019, the Company issued 33,229 and 30,000 shares of restricted stock with a fair market value of $31.60 and $24.00 per share, respectively, to certain 2017 Plan participants as Director’s compensation. These shares of restricted stock granted in the nine months ended September 30, 2020 vest one year from the date of grant and the shares of restricted stock granted during the nine months ended September 30, 2019 vest over three years, or, in each case, in full upon a change in control, subject to the participant’s continued service as a Director throughout such date, or upon retirement. Members of the Board of Directors that receive stock-based compensation are treated as employees for accounting purposes. There were 10,000 shares of restricted stock that became fully vested and were released as unrestricted shares of common stock during the nine months ended September 30, 2020. No restricted shares vested and were released as unrestricted shares of common stock during the nine months ended September 30, 2019. There were 1,667 shares of restricted stock that were forfeited during the nine months ended September 30, 2020. There were no forfeitures of restricted shares during the nine months ended September 30, 2019. There were an aggregate of 267,173 and 242,025 restricted shares outstanding as of September 30, 2020 and September 30, 2019, respectively.

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Options—Options issued to all optionees under the 2017 Plan vest over four years from the date of issuance (or earlier vesting start date, as determined by the Board of Directors) as follows: one half on the second anniversary of date of grant and the remaining half on the fourth anniversary of the date of grant, with the exception of certain annual grants to certain executive officers, which vest annually over a 3-year period. Thefollowing summarizes the options activity of the 2017 Plan for the nine monthsendedSeptember 30, 2020 and September 30, 2019:

	Options to Purchase Common Stock			Weighted- Average Exercise Price per Share		Weighted Average Grant Date Fair Value per Share		Weighted Average Remaining Contract Life (in Years)		Aggregate Intrinsic Value of In-The- Money Options (in Thousands)
Outstanding at December 31, 2018		257,762		$	20	$	10		-	$	1,151
Granted		356,470			27		14		-		—
Forfeited/ cancelled		(17,700	)		19		—		-		—
Outstanding at September 30, 2019		596,532			24		12		8.07		4,693
Outstanding at December 31, 2019		617,852			24		12		7.82		4,693
Granted		851,877			32		12		-		—
Forfeited/ cancelled		(14,375	)		22		—		-		—
Exercised		(925	)		14		—		-		7,918
Outstanding at September 30, 2020		1,454,429			21		12		7.59		7,649
Exercised at September 30, 2020		925			14		—		7.33		7,649
Options vested and expected to vest		1,454,429			21				9.04		7,649

The following weighted-average assumptions were used in the Black-Sholes option-pricing model calculation for the nine months ended September 30, 2020 and September 30, 2019:

	September 30,		September 30,
	2020		2019
Common stock value (per share)	$	16.36	$	27.30
Expected volatility		46.14		47.94
Risk-free interest rate		0.41		2.15
Expected life (years)		7		7
Forfeiture rate	None		None
Dividend rate	None		None

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Montrose Amended & Restated 2013 Stock Option Plan—The following summarizes the activity of the 2013 Plan for the nine monthsendedSeptember 30, 2020 and September 30, 2019:

	Options to Purchase Common Stock			Weighted- Average Exercise Price per Share		Weighted Average Grant Date Fair Value per Share		Weighted Average Remaining Contract Life (in Years)		Aggregate Intrinsic Value of In-The- Money Options (in Thousands)
Outstanding at December 31, 2018		1,900,404		$	6	$	1		7.30		33,290
Forfeited/ cancelled		(14,500	)		8		—		-		—
Expired		(5,400	)		8		—		-		—
Exercised		(19,010	)		6		—		-		466
Outstanding at September 30, 2019		1,861,494			6		1		6.65		47,381
Outstanding at December 31, 2019		1,855,469			6		1		6.40		46,617
Forfeited/ cancelled		(7,500	)		10		—		-		—
Expired		(11,300	)		6		—		-		—
Exercised		(19,175	)		8		—		-		354
Outstanding at September 30, 2020		1,817,494			6		1		5.63		33,772
Exercised at September 30, 2020		221,025			6		—		5.14		33,772
Options vested and expected to vest		1,817,494			6		—		5.17		33,772

Total shares outstanding from exercised options were 221,950 shares and 201,600 shares as of September 30, 2020 and December 31, 2019.

Common Stock Reserved for Future Issuances—At September 30, 2020 and September 30, 2019, the Company has reserved certain stock of its authorized but unissued common stock for possible future issuance in connection with the following:

	September 30,		December 31,
	2020		2019
Warrants		116,350		650,590
Montrose 2013 Stock Incentive Plan		2,047,269		2,058,619
Montrose 2017 Stock Incentive Plan		2,945,443		997,785
Common stock reserved for future issuance		5,109,062		3,706,994

18. NET LOSS PER SHARE

Basic net loss per share is computed by dividing net loss attributable to common stockholders by the weighted average number of common shares outstanding during each period. The Redeemable Series A-1 Preferred Stock, which was outstanding prior to its redemption on July 27, 2020, and the Convertible and Redeemable Series A-2 Preferred Stock are considered a participating security. Net losses are not allocated to the Redeemable Series A-1 Preferred stockholders nor the Convertible and Redeemable Series A-2 stockholders, as they were not contractually obligated to share in the Company’s losses.

Diluted net loss per share is computed by dividing net loss attributable to common stockholders by the weighted average number of common and dilutive common equivalent shares outstanding for the period using the treasury-stock method or the as-converted method. During the three and nine months ended September 30, 2019, up until the warrant options were exercised (Note 11), shares issuable in connection with the warrant options were considered outstanding common shares for purposes of calculating net loss per share since they do not contain any conditions that must be satisfied for the holder to exercise the warrant. Potentially dilutive shares are comprised of restricted stock and shares of common stock underlying stock options outstanding under the Plans and warrants (other than warrant options) to purchase common stock. During the three and nine months ended September 30, 2020 and September 30, 2019, there is no difference in the number of shares used to calculate basic and diluted shares outstanding due to the Company’s net loss and potentially dilutive shares being anti-dilutive.

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The following table summarizes the computation of basic and diluted net loss per share attributable to common stockholders of the Company for the three and nine monthsendedSeptember 30, 2020 and September 30, 2019:

	Three Months Ended September 30,						Nine Months Ended September 30,
In thousands, except for net loss per share	2020			2019			2020			2019
Net loss	$	(30,737	)	$	(6,683	)	$	(58,761	)	$	(12,247	)
Accretion of redeemable series A-1 preferred stock		(6,542	)		(5,030	)		(17,601	)		(14,341	)
Redeemable series A-1 preferred stock deemed dividend		(24,341	)		—			(24,341	)		—
Convertible and redeemable series A-2 preferred stock dividend		(2,870	)		—			(2,870	)		—
Net loss attributable to common stockholders – basic    and diluted		(64,490	)		(11,713	)		(103,573	)		(26,588	)
Weighted-average common shares outstanding –    basic and diluted		21,554			8,718			13,669			8,640
Net loss per share attributable to common stockholders –    basic and diluted	$	(2.99	)	$	(1.34	)	$	(7.58	)	$	(3.08	)

The following equity shares were excluded from the calculation of diluted net loss per share attributable to common stockholders because their effect would have been anti-dilutive for the three and nine months ended September 30, 2020 and September 30, 2019:

	September 30,
	2020		2019
Stock options		2,423,900		2,062,825
Restricted stock		176,384		158,426
Warrants		116,350		116,350

19. SEGMENT INFORMATION

The Company has three operating and reportable segments: Assessment, Permitting and Response, Measurement and Analysis and Remediation and Reuse. These segments are monitored separately by management for performance against budget and prior year and are consistent with internal financial reporting. The Company’s operating segments are organized based upon primary services provided, the nature of the production process, their type of customers, methods used to distribute the products and the nature of the regulatory environment.

Segment Adjusted EBITDA is the primary measure of operating performance for all three operating segments. Segment Adjusted EBITDA is the calculated Company’s Earnings before Interest, Tax, Depreciation and Amortization (“EBITDA”), adjusted to exclude certain transactions such as stock-based compensation, acquisition costs and fair value changes in financial instruments, amongst others. The Chief Operating Decision Maker (“CODM”) does not review segment assets as a measure of segment performance.

Corporate and Other includes costs associated with general corporate overhead (including executive, legal, finance, safety, human resources, marketing and IT related costs) that are not directly related to supporting operations. Overhead costs that are directly related to supporting operations (such as insurance, software, licenses, shared services and payroll processing costs) are allocated to the operating segments on a basis that reasonably approximates an estimate of the use of these services.

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Segment revenues and Adjusted EBITDA for the three and nine monthsendedSeptember 30, 2020 and September 30, 2019 were as follows:

	Three Months Ended September 30,										Nine Months Ended September 30,
	2020					2019					2020					2019
			Segment					Segment					Segment					Segment
	Segment		Adjusted			Segment		Adjusted			Segment		Adjusted			Segment		Adjusted
	Revenues		EBITDA			Revenues		EBITDA			Revenues		EBITDA			Revenues		EBITDA
Assessment, Permitting and Response	$	26,593	$	8,230		$	5,413	$	1,695		$	49,768	$	14,665		$	15,017	$	5,693
Measurement and Analysis		39,770		11,226			35,672		7,691			113,130		30,422			98,521		19,761
Remediation and Reuse		18,342		2,012			16,538		2,400			56,604		6,495			52,440		7,317
Total Operating Segments		84,705		21,468			57,623		11,786			219,502		51,582			165,978		32,771
Corporate and Other		—		(4,762	)		—		(3,567	)		—		(15,425	)		—		(10,935	)
Total	$	84,705	$	16,706		$	57,623	$	8,219		$	219,502	$	36,157		$	165,978	$	21,836

Presented below is a reconciliation of the Company’s segment measure to loss before benefit from income taxes for the three and nine months ended September 30, 2020 and September 30, 2019:

	For the Three Months Ended September 30,						For the Nine Months Ended September 30,
	2020			2019			2020			2019
Total	$	16,706		$	8,219		$	36,157		$	21,836
Interest expense, net		(3,043	)		(2,130	)		(10,896	)		(4,590	)
Income tax (expense) benefit		(3,348	)		412			1,563			1,308
Depreciation and amortization		(9,740	)		(7,412	)		(27,084	)		(20,262	)
Stock-based compensation		(1,149	)		(1,055	)		(3,439	)		(3,577	)
Start-up losses and investment in new services		(602	)		(634	)		(1,283	)		(1,091	)
Acquisition costs		(6	)		(1,278	)		(3,767	)		(2,350	)
Fair value changes in contingent put option		26,265			—			19,240			—
Fair value changes in warrant options		(9,311	)		(2,510	)		(9,312	)		(4,059	)
Fair value changes in compound embedded option		(26,664	)		—			(27,420	)		—
Fair value changes in business acquisitions contingent consideration		(13,404	)		(256	)		(17,387	)		670
Short term purchase accounting fair value adjustment    to deferred revenue		—			—			(243	)		—
IPO preparation costs and IPO related bonuses		(6,378	)		(20	)		(6,908	)		(105	)
Discontinued services (i)		(30	)		—			(7,526	)		—
Expenses related to financing transactions		—			—			(277	)		—
Other expenses		(33	)		(19	)		(179	)		(27	)
Net loss	$	(30,737	)	$	(6,683	)	$	(58,761	)	$	(12,247	)

(i)During the first quarter of 2020, the Company determined to reduce the footprint of its environmental lab in Berkeley, California, and to exit its non-specialized municipal water engineering service line and its food waste biogas engineering service line. As a part of discontinuing service lines, the Company made the decision to book an additional bad debt reserve related to the uncertainty around the ability to collect on receivables related to these service lines (Note 3). It was determined that the discontinuation of these service lines did not represent a strategic shift that had (or will have) a major effect on the Company’s operations and financial results therefore did not meet the requirements to be classified as discontinued operations.

20. RELATED-PARTY TRANSACTIONS

The Company engages a related party to provide Quality of Earnings reports on acquisition targets. The Company paid this related party approximately zero and $0.1 million during the three and nine months ended September 30, 2020 and $0.1 million and $0.4 million during the three and nine months ended September 30, 2019, respectively for its services. This expense is included within selling, general and administrative on the condensed consolidated statements of operations. As of September 30, 2020 and December 31, 2019, the Company had no significant unpaid invoices to this related party, which would be/are included in accounts payable and other accrued liabilities on the condensed consolidated statements of financial position. The related party used by the Company is partially owned through investment vehicles controlled by certain members of the Company’s Board of Directors.

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During the three months ended September 30, 2020, the holder of the Redeemable Series A-1 Preferred Stock and Convertible and Redeemable A-2 Preferred Stock became a stockholder in the Company. On the redemption date of the Redeemable Series A-1 Preferred Stock (Note 15), the Company issued 1,786,739 shares of common stock as dividend payment. Additionally, this related party exercised its warrant options (Note 11), becoming the holder of 2,534,239 additional common shares. This related party owns 17.3% of the total common shares outstanding as of September 30, 2020.

21. DEFINED CONTRIBUTION PLAN

On January 1, 2014, the Company established the Montrose Environmental Group 401(k) Savings Plan. As of September 30, 2020 and December 31, 2019, plan participants may defer up to 85.0% of their eligible wages for the year, up to the Internal Revenue Service dollar limit and catch up contribution allowed by law. Up to May 22, 2020, the Company provided employer matching contributions equal to 100.0% of the first 3.0% of the participant’s compensation and 50.0% of the participant’s elective deferrals that exceed 3.0% but do not exceed 4.0% of the participant’s compensation. Subsequent to May 22, 2020, the Company temporarily ceased making employer contributions. Employer contributions for the three and nine months ended September 30, 2020 were zero and $1.2 million, respectively, and $0.5 million and $1.9 million for the three and nine months ended September 30, 2019, respectively, and are included within selling, general, and administrative expenses on the condensed consolidated statements of operations.

22. SUBSEQUENT EVENTS

Effective October 6, 2020, the Company amended the New Credit Facility to provide for a reduction on the applicable interest rate on the term loan from LIBOR plus 5.0% with a 1.0% LIBOR floor to LIBOR plus 4.5% with a 1.0% LIBOR floor. The revolver interest rate remained unchanged.

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FORWARD-LOOKING STATEMENTS

This Quarterly Report on Form 10-Q contains “forward-looking statements” within the meaning of Section 27A of the Securities Act of 1933, as amended, or the Securities Act, and Section 21E of the Securities Exchange Act of 1934, as amended, or the Exchange Act. These forward-looking statements relate to matters such as our industry, business strategy, goals and expectations concerning our market position, future operations, margins, profitability, capital expenditures, liquidity, capital resources and other financial and operating information. We use words such as “anticipate,” “assume,” “believe,” “contemplate,” “continue,” “could,” “estimate,” “expect,” “future,” “intend,” “may,” “plan,” “position,” “potential,” “predict,” “project,” “seek,” “should,” “target,” “will” and similar terms and phrases to identify forward-looking statements in this filing. All of our forward-looking statements are subject to risks and uncertainties that may cause actual results to differ materially from those that we are expecting, including:

• our limited operating history;

• our history of losses and ability to achieve profitability;

• general global economic, business and other conditions, the cyclical nature of our industry and the significant fluctuations in events that impact our business;

• the impact of the COVID-19 pandemic on our business operations and on local, national and global economies;

• the parts of our business that depend on difficult to predict natural or manmade events and the fluctuations in our revenue and customer concentration as a result thereof;

• the highly competitive nature of our business;

• our ability to execute on our acquisition strategy and successfully integrate and realize benefits of our acquisitions;

• our ability to promote and develop our brands;

• our ability to maintain and expand our client base;

• our ability to maintain necessary accreditations and other authorizations in varying jurisdictions;

• significant environmental governmental regulation;

• our ability to attract and retain qualified managerial and skilled technical personnel;

• safety-related issues;

• allegations regarding compliance with professional standards, duties and statutory obligations and our ability to provide accurate results;

• the lack of formal long-term agreements with many of our clients;

• our ability to successfully implement our new enterprise resource planning system;

• our ability to adapt to changing technology, industry standards or regulatory requirements;

• government clients and contracts;

• our ability to maintain our prices and manage costs; ›

• our ability to protect our intellectual property or claims that we infringe on the intellectual property rights of others;

• laws and regulations regarding handling of confidential information;

• any failure in or breach of our networks and systems;

• our international operations;

• product related risks;

• environmental regulations and liabilities; and

• additional factors discussed in our filings with the Securities and Exchange Commission, or the SEC.

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The forward-looking statements in this Quarterly Report on Form 10-Q are based on historical performance and management’s current plans, estimates and expectations in light of information currently available to us and are subject to uncertainty and changes in circumstances. There can be no assurance that future developments affecting us will be those that we have anticipated. Actual results may differ materially from these expectations due to changes in global, regional or local political, economic, business, competitive, market, regulatory and other factors, many of which are beyond our control, as well as the other factors described in “Risk Factors” in our Final Prospectus datedJuly 22, 2020. Further, many of these factors are, and may continue to be, amplified by the COVID-19 pandemic.

Additional factors or events that could cause our actual results to differ may also emerge from time to time, and it is not possible for us to predict all of them. Should one or more of these risks or uncertainties materialize, or should any of our assumptions prove to be incorrect, our actual results may vary in material respects from what we may have expressed or implied by any forward-looking statement and, therefore, you should not regard any forward-looking statement as a representation or warranty by us or any other person that we will successfully achieve the expectation, plan or objective expressed in such forward-looking statement in any specified time frame, or at all. We caution that you should not place undue reliance on any of our forward-looking statements. Any forward-looking statement made by us speaks only as of the date on which we make it. We undertake no obligation to publicly update any forward-looking statement, whether as a result of new information, future developments or otherwise, except as may be required by applicable securities laws.

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Item 2. Management’s Discussion and Analysis of Financial Condition and Results of Operations.

The following discussion and analysis of our financial condition and results of operations should be read in conjunction with our historical audited and unaudited consolidated financial statements and related notes and other information included elsewhere in this filing and our other filings with the SEC, including our unaudited condensed consolidated financial statements and the accompanying notes as of and for the three and nine months ended September 30, 2020 and 2019 included in Part I, Item 1. “Financial Statements” in this Quarterly Report on Form 10-Q. This discussion contains forward-looking statements that involve risks and uncertainties. Our actual results could differ materially from such forward-looking statements. Factors that could cause or contribute to those differences include, but are not limited to, those identified below and those discussed in the section entitled “Forward-Looking Statements”, and elsewhere in this filing and our other filings with the SEC.

Overview

Since our inception in 2012, our mission has been to help clients and communities meet their environmental goals and needs. Today, we have emerged as one of the fastest growing companies in a highly fragmented and growing $1.25 trillion global environmental industry.

Our Segments

We provide environmental services to our clients through three business segments—Assessment, Permitting and Response, Measurement and Analysis and Remediation and Reuse.

Assessment, Permitting and Response

Through our Assessment, Permitting and Response segment, we provide scientific advisory and consulting services to support environmental assessments, environmental emergency response, and environmental audits and permits for current operations, facility upgrades, new projects, decommissioning projects and development projects. Our technical advisory and consulting offerings include regulatory compliance support and planning, environmental, ecosystem and toxicological assessments and support during responses to environmental disruption. We help clients navigate regulations at the local, state, provincial and federal levels. In addition to environmental toxicology, and given our expertise in helping businesses plan for and respond to disruptions, our scientists and response teams have helped clients navigate their preparation for and response to COVID-19 infections.

Measurement and Analysis

Through our Measurement and Analysis segment, our highly credentialed teams test and analyze air, water and soil to determine concentrations of contaminants as well as the toxicological impact of contaminants on flora, fauna and human health. Our offerings include source and ambient air testing and monitoring, leak detection and advanced analytical laboratory services such as air, storm water, wastewater and drinking water analysis.

Remediation and Reuse

Through our Remediation and Reuse segment, we provide clients with engineering, design, implementation and operations and maintenance services, primarily to treat contaminated water, remove contaminants from soil or create biogas from waste. We do not own the properties or facilities at which we implement these projects or the underlying liabilities, nor do we own material amounts of the equipment used in projects; instead, we assist our clients in designing solutions, managing projects and mitigating their environmental risks and liabilities.

These operating segments have been structured and organized to align with how we view and manage the business with the full lifecycle of our clients’ targeted environmental concerns and needs in mind. Within each segment, we cover similar service offerings, regulatory frameworks, internal operating structures and client types. Corporate activities not directly related to segment performance, including general corporate expenses, interest and taxes, are reported separately.

COVID-19

We are closely monitoring the impact of the COVID-19 pandemic on our business, including the impact on our customers, employees and suppliers. While COVID-19 did not have a material adverse effect on our reported results for the first nine months of 2020, we did experience some changes to our business operations. The changes were primarily composed of client postponement of on-site environmental compliance testing, delays in project start dates, and postponement or reformatting of scientific presentations

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and sales visits. As of September 30, 2020, several employees either contracted or were exposed to COVID-19.  Exposed employees have been asked to quarantine per company protocols.  To date, COVID-19-related quarantines have not had a material adverse effect on our reported results. We believe these COVID-19 impacts are temporaryand accordingly we have instituted temporary cost mitigation measures such as reducing non-billable time for a subset of our impacted workforce. Our businesses exposed to commercial food waste and non-specialized municipal water engineering projects also saw or are seeing more significant disruptions and, as a result, in the first quarter we exited those service lines as described further below. On the other hand, our recent CTEH acquisition has seen benefits from COVID-19 given client demand for its toxicology and response services. In the aggregate, the majority of our business and our outlook for 2020 has been largely unimpacted to-date. COVID-19 has however had an impact on our typical seasonality, with second quarter results being relatively lower than we would typically expect and third quarter revenues, which have historically been in line with second quarter revenues, increasing 15.0% versus the second quarter in part due to delays and cancellations in the second quarter related to government and related restrictions as part of the initial response to the pandemic, shifting some of these revenues to the third quarter. We have not experienced a significant slowdown in cash collections, and as a result cash flow from operations has not been materially adversely impacted. In addition, in the second quarter we entered into a new credit facility, replacing our prior senior secured credit facility, and as a result, increased cash on hand and borrowing capacity. We expect our sources of liquidity to be sufficient for our operating needs for the next twelve months. See “Liquidity and Capital Resources.”

On March 27, 2020, the Coronavirus Aid, Relief, and Economic Security Act, or the CARES Act, was enacted. The CARES Act includes several significant provisions for corporations, including those pertaining to net operating losses, interest deductions and payroll tax benefits. We anticipate utilizing certain of these provisions, including the deferral of the employer side social security payments for payroll for the remainder of 2020. We expect to defer approximately $5.0 million of payments to 2021 and 2022.

It is difficult to predict the future impact COVID-19 may have on our business, results of operations, financial position, or cash flows. The extent to which we may be impacted will depend largely on future and rapidly evolving developments, including new information on the severity of the pandemic, potential testing, treatment or vaccines for the virus, and actions by various government authorities to contain the pandemic and mitigate its impact. We intend to closely monitor the impact of COVID-19 on our business and will respond as we believe is appropriate.

Key Factors that Affect Our Business and Our Results

Our operating results and financial performance are influenced by a variety of internal and external trends and other factors. Some of the more important factors are discussed briefly below.

Acquisitions

We have been, and expect to continue to be, an acquisitive company. Since January 1, 2017, we have acquired 24 businesses (seven businesses in each of the last three fiscal years and three during the nine months ended September 30, 2020).

Acquisitions have expanded our environmental service capabilities across all three segments, our access to technology, as well as our geographic reach in the United States, Canada and Australia. We acquired two and three businesses during the three months ended September 30, 2020 and September 30, 2019, respectively, and three and seven businesses during the nine months ended September 30, 2020 and September 30, 2019, respectively. For the three months ended September 30, 2020 and September 30, 2019, approximately $22.6 million and $1.9 million, or 26.7% and 3.3% of our revenues, respectively, and for the nine months ended September 30, 2020 and September 30, 2019, approximately $37.2 million and $7.7 million, or 17.0% and 4.6% of our revenues, respectively, was generated from acquisitions occurring during the applicable period. See Note 6 to our unaudited condensed consolidated financial statements. Revenues from acquired companies exclude intercompany revenues from revenue synergies realized between business lines within operating segments, as these are eliminated at the consolidated segment and Company level. We expect our revenue growth to continue to be driven in significant part by acquisitions, in particular, by our recent acquisition of CTEH.

As a result of our acquisitions, goodwill and other intangible assets represent a significant proportion of our total assets, and amortization of intangible assets has historically been a significant expense. For the three months ended September 30, 2020 and September 30, 2019, amortization expense was $7.6 million and $5.3 million, respectively. For the nine months ended September 30, 2020 and September 30, 2019, amortization expense was $21.0 million and $14.4 million, respectively. Our historical financial statements also include other acquisition-related costs, including costs relating to external legal support, diligence and valuation services and other transaction and integration-related matters. For the three months ended September 30, 2020, total acquisition-related costs were immaterial and for September 30, 2019, total acquisition-related costs were $1.3 million. For the nine months ended September 30, 2020 and September 30, 2019, total acquisition-related costs were $3.8 million and $2.4 million, respectively. In addition, in any year gains and losses from changes in the fair value of earn-out related contingent consideration could be significant.

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For the three months ended September 30, 2020 and September 30, 2019,fair value adjustments of contingent consideration were $13.4 million and $0.3 million, respectively, and for the ninemonths ended September 30, 2020 and September 30, 2019,fair value adjustments of contingent consideration were $17.4 million and $0.7 million, respectively.Additionally, we may be required to make up to $80.0 million in earn-out payments over the next two years in connection with our recent acquisition of CTEH, a portion of which will be paid in the form of shares of our common stock. See “Liquidity and Capital Resources.” We expect that amortization of identifiable intangible assets and other acquisition-related costs, assuming we continue to acquire, will continue to be significant.

Organic Growth

We have grown organically and expect to continue to do so. We define organic growth as the change in revenues excluding revenues from acquisitions for the first twelve months following the date of acquisition. Management uses organic growth as one of the means by which it assesses our results of operations. Organic growth is not, however, a measure of revenue growth calculated in accordance with GAAP and should be considered in conjunction with revenue growth calculated in accordance with GAAP.

Discontinued Service Lines

Periodically, or when circumstances warrant, we evaluate the performance of our business services to ensure that performance and outlook are consistent with expectations. During the first quarter of 2020, as part of this evaluation, we determined to scale back operations of our environmental lab in Berkeley, California, and to exit our non-specialized municipal water engineering service line and our food-waste biogas engineering service line, collectively, the Discontinued Service Lines. The factors underlying these decisions were accelerated and amplified by the COVID-19 pandemic, which for example, has made the collection of commercial food waste used in biodigesters less consistent and delayed the approval or initiation of certain projects dependent on municipal or state funding. As a part of discontinuing these service lines, a process which was completed in the second quarter of 2020, we eliminated select personnel and, in the first quarter of 2020, booked an additional bad debt reserve related to the increased uncertainty around the ability to collect on receivables related to these service lines. Revenues from our non-specialized municipal water engineering service line and our food-waste biogas engineering, which are included in the results of our Remediation and Reuse segment, were zero and $2.5 million in the three months ended September 30, 2020 and September 30, 2019, respectively, and $1.4 million and $9.9 million in the nine months ended September 30, 2020 and September 30, 2019, respectively. Revenues from our Berkeley lab, which are included in the results of our Measurement and Analysis segment, were zero and $2.0 million in the three months ended September 30, 2020 and September 30, 2019, respectively, and $2.4 million and $5.6 million in the nine months ended September 30, 2020 and September 30, 2019, respectively. We no longer generate any revenues from the Discontinued Service Lines.

Revenue Mix

Our segments generate different levels of profitability and, accordingly, shifts in the mix of revenues between segments can impact our consolidated reported net income, operating margin, Adjusted EBITDA and Adjusted EBITDA margin from year to year. See Note 19 to our unaudited condensed consolidated financial statements. Inter-company revenues between business lines within segments have been eliminated.

Financing Costs

Financing costs, relating primarily to interest expense on our debt, continue to be a significant component of our results of operations. For the three months ended September 30, 2020 and September 30, 2019, we incurred interest expense of $3.0 million and $2.1 million, respectively. For the nine months ended September 30, 2020 and September 30, 2019, we incurred interest expense of $10.9 million and $4.6 million, respectively. On April 13, 2020, we entered into the Unitranche Credit Agreement providing for a new $225.0 million credit facility comprised of a $175.0 million term loan and a $50.0 million revolving credit facility and used the proceeds therefrom to repay in full all amounts outstanding under our prior senior secured credit facility. We incurred debt extinguishment costs of $1.4 million in connection with this refinancing transaction. Effective October 6, 2020, the Company amended its Unitrache Credit Agreement to provide for a reduction on the applicable interest rate on the term loan from LIBOR plus 5.0% with a 1.0% LIBOR floor to LIBOR plus 4.5% with a 1.0% LIBOR floor. The revolver interest rate remained unchanged. We expect interest expense to increase as compared to 2019 periods due to the higher interest rates under our new credit facility and that it will remain a significant cost as we continue to leverage our credit facility to support our operations and future acquisitions.

Corporate and Operational Infrastructure Investments

Our historical operating results reflect the impact of our ongoing investments in our corporate infrastructure to support our growth. We have made and expect to continue to make investments in our business platform that we believe have laid the foundation for continued growth. Investments in logistics, quality, risk management, sales and marketing, safety, human resources, research and

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development, finance and information technology and other areas enable us to support continued growth. These investments have allowed us to improve our operating margins.

Seasonality

Because demand for environmental services is not driven by specific or predictable patterns in one or more fiscal quarters, our business is better assessed based on yearly results. In addition, our operating results experience some quarterly variability. Excluding the impact of revenues and earnings from new acquisitions, we typically generate slightly lower revenues and lower earnings in the first and fourth quarters and higher overall revenues and earnings in the second and third quarters. Historically, quarterly variability has been driven by weather patterns, which generally impact our field-based teams’ ability to operate in the winter months. As we continue to grow and expand into new geographies and service lines, quarterly variability may deviate from historical trends.

Earnings Volatility

We expect to experience increased annual and quarterly revenue and earnings volatility as a result of the timing of large contract wins in our Remediation and Reuse segment. In addition, the acquisition of CTEH exposes us to potentially significant revenue and earnings fluctuations tied to the timing of large environmental emergency response projects following an incident or natural disaster. As a result, we may experience revenues and earnings in a quarter or year that are not indicative of future results.

Results of Operations

Three Months Ended September 30, 2020 Compared to the Three Months Ended September 30, 2019

	For the Three Months Ended September 30,
(in thousands, except per share data)	2020			2019
Statements of operations data:
Revenues	$	84,705		$	57,623
Cost of revenues (exclusive of depreciation and amortization)		51,828			39,804
Selling, general and administrative expenses		24,442			12,656
Fair value changes in business acquisitions    contingent consideration		13,404			256
Depreciation and amortization		9,740			7,412
Loss from operations	$	(14,709	)	$	(2,505	)
Other expense		(9,637	)		(2,460	)
Interest expense, net		(3,043	)		(2,130	)
Loss before income taxes		(27,389	)		(7,095	)
Income tax expense (benefit)		3,348			(412	)
Net loss	$	(30,737	)	$	(6,683	)
Accretion of redeemable preferred stock		(6,542	)		(5,030	)
Series A-1 deemed dividend		(24,341	)		—
Series A-2 dividend payment		(2,870	)		—
Net loss attributable to common stockholders	$	(64,490	)	$	(11,713	)
Weighted average number of shares (basic and diluted)		21,554			8,718
Loss per share	$	(2.99	)	$	(1.34	)
Other financial data:
Adjusted EBITDA(1)	$	16,706		$	8,060
Adjusted EBITDA margin(1)		19.7	%		14.0	%

(1) Non-GAAP measure. See the section entitled “Non-GAAP Financial Information” for a discussion of non-GAAP measures and a reconciliation thereof to the most directly comparable GAAP measure.

Revenues

For the three months ended September 30, 2020, we had revenues of $84.7 million, an increase of $27.1 million, or 47.0% over the three months ended September 30, 2019. Excluding the impact of Discontinued Service Lines revenues of $4.5 million, revenues increased $31.6 million. The increase in revenues was driven by acquisitions completed in, and subsequent to, the third quarter of

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2019, which contributed $22.6 million to the increase in revenues during the three months ended September 30, 2020, as well as organic growth in our Measurement and Analysis and Remediation and Reuse segments.All segments were impacted by COVID-19, primarily in the form of delays in project start dates, partially offset byCOVID-19 related project work in our Assessment, Permitting and Response segment.

For the three months ended September 30, 2020, our Assessment, Permitting and Response segment generated $26.6 million, or 31.4% of total revenues, our Measurement and Analysis segment generated $39.8 million, or 47.0% of total revenues, and our Remediation and Reuse segment generated $18.3 million, or 21.7% of total revenues. For the three months ended September 30, 2019, we had revenues of $57.6 million, of which our Assessment, Permitting and Response segment generated $5.4 million, or 9.4% of total revenues, our Measurement and Analysis segment generated $35.7 million, or 61.9% of total revenues, and our Remediation and Reuse segment generated $16.5 million, or 28.7% of total revenues. Revenue from Discontinued Service Lines was zero and $4.5 million for the three months ended September 30, 2020 and September 30, 2019, respectively, of which zero and $2.0 million, respectively, was in our Measurement and Analysis segment, and zero and $2.5 million, respectively, was in our Remediation and Reuse segment.

Cost of Revenues

Cost of revenues consists of all direct costs required to provide services, including fixed and variable direct labor costs, equipment rental and other outside services, field and lab supplies, vehicle costs and travel- related expenses.

For the three months ended September 30, 2020, cost of revenues was $51.8 million or 61.2% of revenues, compared to $39.8 million or 69.1% of revenues for the three months ended September 30, 2019. The decline in cost of revenues as a percentage of revenues was a result of favorable business mix, temporary COVID-19 related cost containment measures, mostly related to direct labor costs in our Measurement and Analysis segment, as well as lower sub-contractor costs, driven by the decision to exit the Discontinued Service Lines at the end of the first quarter of 2020.

For the three months ended September 30, 2020, cost of revenues was comprised of direct labor of $31.0 million, outside services (including sub-contractor costs, laboratory, shipping and freight and other outside services) of $9.1 million, field supplies, testing supplies and equipment rental of $6.2 million, project-related travel expenses of $3.7 million and other direct costs of $1.8 million.

For the three months ended September 30, 2019, cost of revenues was comprised of direct labor of $24.3 million, outside services (including sub-contractor costs, laboratory, shipping and freight and other outside services) of $8.3 million, field supplies, testing supplies and equipment rental of $3.7 million, project-related travel expenses of $2.3 million and other direct costs of $1.2 million.

Selling, General and Administrative Expenses

Selling, general and administrative expenses consist of general corporate overhead, including executive, legal, finance, safety, risk management, human resource, marketing and information technology related costs, as well as indirect operational costs of labor, rent, insurance and stock-based compensation.

For the three months ended September 30, 2020, selling, general and administrative expenses were $24.4 million, an increase of $11.7 million or 93.1% versus the three months ended September 30, 2019, of which $6.4 million related to non-capitalizable IPO-related costs and $5.2 million was from the existing selling, general and administrative expenses of companies we acquired in, and subsequent to, the third quarter of 2019. Selling, general and administrative expenses included investments in corporate infrastructure (primarily finance, sales and marketing, safety, IT and human resources) and public company related costs, partially offset by lower travel costs and internal labor costs capitalized as part of the Enterprise Resource Planning (ERP) implementation. Excluding IPO-related costs and capitalized internal labor costs of $6.4 million and $0.4 million respectively, selling, general and administrative expenses were 21.8% of revenues for three months ended September 30, 2020, compared to 21.9% of revenues in the prior year.

For the three months ended September 30, 2020, selling, general and administrative expenses were comprised of indirect labor of $8.8 million, IPO-related costs of $6.4 million, facilities costs of $3.0 million, stock-based compensation of $0.9 million, and other costs (including software, travel, insurance, legal, consulting and audit services) of $5.3 million.

For the three months ended September 30, 2019, selling, general and administrative expenses were $12.7 million, which was comprised of indirect labor of $4.7 million, facilities costs of $2.7 million, stock-based compensation of $0.7 million, acquisition-related costs of $1.3 million, and other costs (including software, travel, insurance, legal, consulting and audit services) of $3.3 million.

We expect our general and administrative expenses to increase as a result of additional insurance, legal, accounting, investor relations and other costs associated with becoming a public company.

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Fair Value Changes in Business Acquisitions Contingent Consideration

For the three months ended September 30, 2020, fair value changes business acquisitions contingent consideration were $13.4 million, an increase of $13.1 million versus $0.3 million for the three months ended September 30, 2019. The increase was driven by fair value adjustments to CTEH business acquisitions contingent consideration related to 2020 and 2021.

Depreciation and Amortization

Depreciation and amortization expense for the three months ended September 30, 2020, was $9.7 million and was comprised of amortization of finite lived intangibles of $7.6 million, arising as a result of our acquisition activity, and depreciation of property and equipment of $2.1 million. Depreciation and amortization expense for the three months ended September 30, 2019, was $7.4 million and was comprised of amortization of finite lived intangibles of $5.3 million and depreciation of property and equipment of $2.1 million. The increase in both depreciation and amortization for the three months ended September 30, 2020 versus the nine months ended September 30, 2019, was primarily a result of acquisitions.

Other Expense

Other expense for the three months ended September 30, 2020 of $9.6 million was driven by fair value adjustments related to (i) the Series A-1 preferred stock contingent put option, (ii) the Series A-2 preferred stock embedded derivative and (iii) the Series A-1 and A-2 preferred stock warrant options. Other expense of $2.5 million for the three months ended September 30, 2019 was driven primarily by fair value adjustments related to the Series A-1 preferred stock warrant option.  See Notes 11, 15 and 16 to our unaudited condensed consolidated financial statements.

Interest Expense, Net

Interest expense, net incurred in the three months ended September 30, 2020, was $3.0 million, compared to $2.1 million for the three months ended September 30, 2019. The increase in interest expense was driven by higher outstanding debt balances and higher borrowings under an equipment line of credit, as well as higher average interest rates, as a result of the repayment of our prior senior secured credit facility using proceeds from the Unitranche credit facility, which carries a higher rate of interest. See Note 12 to our unaudited condensed consolidated financial statements.

Income taxes expense (benefit)

Income tax expense (benefit) was $3.3 million and $(0.4) million for the three months ended September 30, 2020 and September 30, 2019, respectively. The increase in income tax expense is primarily attributable to recording of a valuation allowance of $7.4 million against the net deferred tax assets and an increase in permanently disallowed tax deductions for U.S. federal income tax purposes including, but not limited to, non-deductible mark to market adjustments and Global Intangible Low Taxed Income as well as state and foreign income tax provisions.

Net loss and Adjusted EBITDA

For the three months ended September 30, 2020, net loss was $30.7 million and Adjusted EBITDA was $16.7 million. For the three months ended September 30, 2019, net loss was $6.7 million and Adjusted EBITDA was $8.1 million. See the section entitled

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“Non-GAAP Financial Information” for a discussion of non-GAAP measures and a reconciliation thereof to the most directly comparable GAAP measure.

Nine Months Ended September 30, 2020 Compared to the Nine Months Ended September 30, 2019

	For the Nine Months Ended September 30,
(in thousands, except per share data)	2020			2019
Statements of operations data:
Revenues	$	219,502		$	165,978
Cost of revenues (exclusive of depreciation and amortization)		142,115			116,248
Selling, general and administrative expenses		64,810			35,464
Fair value changes in business acquisitions    contingent consideration		17,387			(670	)
Depreciation and amortization		27,084			20,262
Loss from operations	$	(31,894	)	$	(5,326	)
Other expense		(17,534	)		(3,639	)
Interest expense, net		(10,896	)		(4,590	)
Loss before income taxes		(60,324	)		(13,555	)
Income tax benefit		(1,563	)		(1,308	)
Net loss	$	(58,761	)	$	(12,247	)
Accretion of redeemable preferred stock		(17,601	)		(14,341	)
Series A-1 deemed dividend		(24,341	)		—
Series A-2 dividend payment		(2,870	)		—
Net loss attributable to common stockholders	$	(103,573	)	$	(26,588	)
Weighted average number of shares (basic and diluted)		13,669			8,640
Loss per share	$	(7.58	)	$	(3.08	)
Other financial data:
Adjusted EBITDA(1)	$	36,157		$	20,721
Adjusted EBITDA margin(1)		16.5	%		12.5	%

(1) Non-GAAP measure. See the section entitled “Non-GAAP Financial Information” for a discussion of non-GAAP measures and a reconciliation thereof to the most directly comparable GAAP measure.

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Revenues

For the nine months ended September 30, 2020, we had revenues of $219.5 million, an increase of $53.5 million or 32.2% over the nine months ended September 30, 2019. Excluding revenues from Discontinued Service Lines of $3.8 million and $15.5 million in the nine months ended September 30, 2020 and September 30, 2019, respectively, revenues increased $65.2 million.  The increase in revenues was driven by acquisitions completed in 2019 and 2020, which contributed $37.2 million to the increase in revenues, as well as organic growth in our Measurement and Analysis and Remediation and Reuse segments. All segments were impacted by COVID-19, primarily in the form of delays in project start dates, beginning in March 2020, partially offset by COVID-19 related project work in our Assessment, Permitting and Response segment from the CTEH acquisition.  

During the nine months ended September 30, 2020, our Assessment, Permitting and Response segment generated $49.8 million, or 22.7% of total revenues, our Measurement and Analysis segment generated $113.1 million, or 51.5% of total revenues, and our Remediation and Reuse segment generated $56.6 million, or 25.8% of total revenues. For the nine months ended September 30, 2019, we had revenues of $166.0 million, of which our Assessment, Permitting and Response segment generated $15.0 million, or 9.0% of total revenues, our Measurement and Analysis segment generated $98.5 million, or 59.4% of total revenues, and our Remediation and Reuse segment generated $52.4 million, or 31.6% of total revenues. Revenue from Discontinued Service Lines contributed $3.8 million and $15.5 million to revenues during the nine months ended September 30, 2020 and September 30, 2019, respectively, of which $2.4 million and $5.6 million, respectively, was in our Measurement and Analysis segment, and $1.4 million and $9.9 million, respectively, was in our Remediation and Reuse segment.

Cost of Revenues

For the nine months ended September 30, 2020, cost of revenues was $142.1 million or 64.7% of revenues, and was comprised of direct labor of $88.1 million, outside services (including construction, laboratory, shipping and freight and other outside services) of $24.8 million, field supplies, testing supplies and equipment rental of $15.5 million, project-related travel expenses of $7.5 million and other direct costs of $6.2 million. For the nine months ended September 30, 2020, cost of revenues as a percentage of revenues fell 5.3% from the prior year, as a result of lower labor and outside services as a percentage of revenue. These drivers were primarily as a result of changes in segment mix, as well as labor-related savings from temporary cost mitigation efforts related to COVID-19 and the exiting of Discontinued Service Lines at the end of the first quarter of 2020.

For the nine months ended September 30, 2019, cost of revenues was $116.2 million or 70.0% of revenues, and was comprised of direct labor of $69.0 million, outside services (including construction, laboratory, shipping and freight and other outside services) of $24.9 million, field supplies, testing supplies and equipment rental of $12.1 million, project-related travel expenses of $6.0 million and other direct costs of $4.2 million.

Selling, General and Administrative Expenses

For the nine months ended September 30, 2020, selling, general and administrative expenses were $64.8 million, an increase of $29.3 million or 82.7% versus the prior year, of which $12.4 million was from selling, general and administrative expenses pertaining to companies we acquired in 2019 and in 2020. The remaining $16.9 million increase was primarily due to an increase in IPO related expenses of $6.8 million, an increase in bad debt of $5.8 million, primarily related to the Discontinued Service Lines, an increase in acquisition related costs of $1.4 million, investment in corporate infrastructure (primarily finance, sales and marketing, safety, IT and human resources) and public company related costs.

For the nine months ended September 30, 2020, selling, general and administrative expenses were comprised of indirect labor of $30.0 million, facilities costs of $8.8 million, IPO-related costs of $6.9 million, stock-based compensation of $2.3 million, acquisition-related costs of $3.8 million, bad debt expense of $6.4 million, and other costs (including software, travel, insurance, legal, consulting and audit services) of $6.6 million.

For the nine months ended September 30, 2019, selling, general and administrative expenses of $35.5 million, were comprised of indirect labor of $12.9 million, facilities costs of $7.9 million, stock-based compensation of $2.6 million, acquisition-related costs of $2.4 million, bad debt expense of $0.6 million and other costs (including software, travel, insurance, legal, consulting and audit services) of $9.1 million.

We expect our general and administrative expenses to increase as a result of additional insurance, legal, accounting, investor relations and other costs associated with becoming a public company.

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Fair Value Changes in Business Acquisitions Contingent Consideration

For the nine months ended September 30, 2020, fair value changes in business acquisitions contingent consideration were $17.4 million, an increase of $18.1 million versus a credit of $0.7 million for the nine months ended September 30, 2019. The increase was driven by fair value adjustments to CTEH and Analytical Environmental Services, Corp. (AES) business acquisitions contingent consideration related to 2020 and 2021.

Depreciation and Amortization

Depreciation and amortization expense for the nine months ended September 30, 2020, was $27.1 million and was comprised of amortization of finite lived intangibles of $21.0 million, arising as a result of our acquisition activity, and depreciation of property and equipment of $6.1 million. Depreciation and amortization expense for the nine months ended September 30, 2019, was $20.3 million and was comprised of amortization of finite lived intangibles of $14.4 million and depreciation of property and equipment of $5.9 million. The increase in both depreciation and amortization for the nine months ended September 30, 2020 versus the nine months ended September 30, 2019 is primarily a result of acquisitions.

Other Expense

Other expense for the nine months ended September 30, 2020 of $17.5 million was driven primarily by fair value adjustments related to (i) the Series A-1 preferred stock contingent put option, (ii) the Series A-2 embedded options, and (iii) the Series A-1 and A-2 preferred stock warrant options. Other expense for the nine months ended September 30, 2019 of $3.6 million related primarily to fair value adjustments to the Series A-1 warrant option. See Notes 11, 15 and 16 to our unaudited condensed consolidated financial statements.

Interest Expense, Net

Interest expense, net incurred during the nine months ended September 30, 2020 was $10.9 million, compared to $4.6 million for the nine months ended September 30, 2019. The increase in interest expense was driven by higher outstanding debt balances and higher borrowings under an equipment line of credit, as well as higher average interest rates, as a result of the repayment of our prior senior secured credit facility in April, 2020, using proceeds from the Unitranche credit facility, which carries a higher rate of interest. Interest expense in the nine months ended September 30, 2020 also includes $1.4 million from both payments made and the write off of deferred debt issuance costs, related to the repayment of our prior senior secured credit facility. See Note 12 to our unaudited condensed consolidated financial statements.

Income taxes benefit

Income tax benefit was $1.6 million and $1.3 million for the nine months ended September 30, 2020 and September 30, 2019, respectively. The difference between our effective tax rate and the federal statutory rate of 21.0% is primarily attributable to items recorded for GAAP but permanently disallowed for U.S. federal income tax purposes, recognition of a US federal and state valuation allowance of $7.4 million, state and foreign income tax provisions and Global Intangible Low Taxed Income.

Net loss and Adjusted EBITDA

For the nine months ended September 30, 2020, net loss was $58.8 million and Adjusted EBITDA was $36.2 million. For the nine months ended September 30, 2019, net loss was $12.2 million and Adjusted EBITDA was $20.7 million. See the section entitled

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“Non-GAAP Financial Information” for a discussion of non-GAAP measures and a reconciliation thereof to the most directly comparable GAAP measure.

Segment Results of Operations

Three Months Ended September 30, 2020 Compared to the Three Months Ended September 30, 2019

	Three Months Ended September 30,
	2020								2019
(in thousands)	Segment Revenues		Segment Adjusted EBITDA(1)			Segment Adjusted EBITDA Margin(2)			Segment Revenues		Segment Adjusted EBITDA(1)(3)			Segment Adjusted EBITDA Margin(2)
Assessment, Permitting and Response	$	26,593	$	8,230			30.9	%	$	5,413	$	1,695			31.3	%
Measurement and Analysis		39,770		11,226			28.2	%		35,672		7,691			21.6	%
Remediation and Reuse		18,342		2,012			11.0	%		16,538		2,400			14.5	%
Total Operating Segments	$	84,705	$	21,468			25.3	%	$	57,623	$	11,786			20.5	%
Corporate and Other				(4,762	)	n/a						(3,567	)	n/a

(1) For purposes of evaluating segment profit, the Company’s chief operating decision maker reviews Segment Adjusted EBITDA as a basis for making the decisions to allocate resources and assess performance. See Note 19 to our unaudited condensed consolidated financial statements.

(2) Represents Segment Adjusted EBITDA as a percentage of revenues.

(3) Aggregate amount does not foot to consolidated amount disclosed elsewhere in this filing due to an adjustment at the consolidated level to exclude earnings related to the Discontinued Service Lines.  See “Non-GAAP Financial Information” and Note 19 to our unaudited condensed consolidated financial statements.

Revenues

Assessment, Permitting and Response segment revenues for the three months ended September 30, 2020 were $26.6 million, an increase of $21.2 million or 391.3% compared to $5.4 million for the three months ended September 30, 2019. The increase was driven by the acquisition of CTEH in the second quarter of 2020, which expanded our product portfolio and our scientific and technical advisory services footprint.

Measurement and Analysis segment revenues for the three months ended September 30, 2020 were $39.8 million, an increase of $4.1 million or 11.5% compared to revenues for the three months ended September 30, 2019 of $35.7 million. The increase was primarily driven by organic growth. The increase was partially offset by a $2.0 million decline in revenues from Discontinued Service Lines. Revenues from Discontinued Service Lines in the Measurement and Analysis segment were zero and $2.0 million in the three months ended September 30, 2020 and September 30, 2019, respectively.

Remediation and Reuse segment revenues for the three months ended September 30, 2020 were $18.3 million, an increase of $1.8 million or 10.9% compared to revenues for the three months ended September 30, 2019 of $16.5 million. The increase was primarily driven by organic growth and $2.4 million from acquisitions, partially offset by a $2.5 million decline in revenues from Discontinued Services. Revenues from Discontinued Service Lines were zero and $2.5 million in the three months ended September 30, 2020 and September 30, 2019, respectively.

Segment Adjusted EBITDA

Assessment, Permitting and Response Segment Adjusted EBITDA was $8.2 million for the three months ended September 30, 2020, compared to $1.7 million for the three months ended September 30, 2019. For the three months ended September 30, 2020 and September 30, 2019, Segment Adjusted EBITDA margin was 30.9% and 31.3%, respectively. The increase in Segment Adjusted EBITDA was primarily a result of the acquisition of CTEH in the second quarter of 2020.

Measurement and Analysis Segment Adjusted EBITDA for the three months ended September 30, 2020 was $11.2 million, an increase of $3.5 million compared to Segment Adjusted EBITDA for the three months ended September 30, 2019 of $7.7 million. For the three months ended September 30, 2020 Segment Adjusted EBITDA margin was 28.2% compared to 21.6% in the prior year. The improvement in Segment Adjusted EBITDA and Segment Adjusted EBITDA margin was primarily as a result of higher revenues, favorable business mix and temporary cost mitigation initiatives taken in the second quarter of 2020 in response to COVID-19.

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Remediation and Reuse Segment Adjusted EBITDA was $2.0 millionfor the threemonths ended September 30, 2020 and$2.4 million for the three months ended September 30, 2019. For the threemonths ended September 30, 2020,Segment Adjusted EBITDA margin was 11.0% compared to 14.5% during the three months ended September 30, 2019. The decrease in Segment Adjusted EBITDA and Segment Adjusted EBITDA margin was a result of higher fixed costs in anticipation of growth and geographic expansion.

Corporate and other costs were $4.8 million, or 5.6% of revenues, for the nine months ended September 30, 2020 compared to $3.6 million, or 6.2% of revenues, for the three months ended September 30, 2019. The cost increase was driven by public company related costs, head count additions in sales and marketing, human resources, information technology, safety and finance made in 2019 subsequent to the third quarter to support higher anticipated revenues, as well as higher legal costs, partially offset by lower travel costs and internal labor costs capitalized as part of the ERP implementation.

Nine Months Ended September 30, 2020 Compared to the Nine Months Ended September 30, 2019

	Nine Months Ended September 30,
	2020								2019
(in thousands)	Segment Revenues		Segment Adjusted EBITDA(1)			Segment Adjusted EBITDA Margin(2)			Segment Revenues		Segment Adjusted EBITDA(1)(3)			Segment Adjusted EBITDA Margin(2)
Assessment, Permitting and Response	$	49,768	$	14,665			29.5	%	$	15,017	$	5,693			37.9	%
Measurement and Analysis		113,130		30,422			26.9	%		98,521		19,761			20.1	%
Remediation and Reuse		56,604		6,495			11.5	%		52,440		7,317			14.0	%
Total Operating Segments	$	219,502	$	51,582			23.5	%	$	165,978	$	32,771			19.7	%
Corporate and Other				(15,425	)	n/a						(10,935	)	n/a

(1) For purposes of evaluating segment profit, the Company’s chief operating decision maker reviews Segment Adjusted EBITDA as a basis for making the decisions to allocate resources and assess performance. See Note 19 to our unaudited condensed consolidated financial statements.

(2) Represents Segment Adjusted EBITDA as a percentage of revenues.

(3) Aggregate amount does not foot to consolidated amount disclosed elsewhere in this filing due to an adjustment at the consolidated level to exclude earnings related to the Discontinued Service Lines.  See “Non-GAAP Financial Information” and Note 19 to our unaudited condensed consolidated financial statements.

Revenues

Assessment, Permitting and Response segment revenues for the nine months ended September 30, 2020 were $49.8 million, compared to $15.0 million for the nine months ended September 30, 2019. The 231.4% increase was due to the acquisition of CTEH in the second quarter of 2020.

Measurement and Analysis segment revenues for the nine months ended September 30, 2020 were $113.1 million, an increase of $14.6 million or 14.8% compared to revenues for the nine months ended September 30, 2019 of $98.5 million. Excluding revenues from Discontinued Service Lines of $2.4 million and $5.6 million in the nine months ended September 30,2020 and September 30, 2019, respectively, revenues increased $17.8 million. The increase was driven by acquisitions in 2019, which contributed $9.6 million to the increase in revenues, as well as organic growth.

Remediation and Reuse segment revenues for the nine months ended September 30, 2020 were $56.6 million, an increase of $4.2 million or 7.9% compared to revenues for the nine months ended September 30, 2019 of $52.4 million. Excluding revenues from Discontinued Service Lines of $1.4 million and $9.9 million for the nine months ended September 30, 2020 and September 30, 2019, respectively, revenues increased $12.7 million. The increase was driven by acquisitions, which contributed $10.1 million to the increase in revenues, as well as organic growth.

Segment Adjusted EBITDA

Assessment, Permitting and Response Segment Adjusted EBITDA was $14.7 million for the nine months ended September 30, 2020, compared to $5.7 million for the nine months ended September 30, 2019 driven by the increase in revenues. For the nine months ended September 30, 2020 and September 30, 2019, Segment Adjusted EBITDA margin was 29.5% and 37.9%, respectively. The decrease in Segment Adjusted EBITDA margin was driven primarily by a shift in business mix due to the acquisition of CTEH which typically operates at lower margins than our legacy segment business.

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Measurement and Analysis Segment Adjusted EBITDA for the nine months ended September 30, 2020 was $30.4 million, an increase of $10.6 million compared to Segment Adjusted EBITDA for the nine months ended September 30, 2019 of $19.8 million. For the nine months ended September 30, 2020 Segment Adjusted EBITDA margin was 26.9% compared to 20.1% in the prior year. The improvement in Segment Adjusted EBITDA and Segment Adjusted EBITDA margin was as a result of revenue growth, favorable business mixand temporary cost mitigation initiatives taken in the second quarter of 2020 in response to COVID-19.

Remediation and Reuse Segment Adjusted EBITDA for the nine months ended September 30, 2020 was $6.5 million, a decrease of $0.8 million compared to Segment Adjusted EBITDA for the nine months ended September 30, 2019 of $7.3 million. For the nine months ended September 30, 2020 Segment Adjusted EBITDA margin was 11.5% compared to 14.0% during the nine months ended September 30, 2019. The decrease in Segment Adjusted EBITDA and Segment Adjusted EBITDA margin was primarily attributable to higher fixed costs in anticipation of additional growth and geographic expansion, partially offset by revenue growth.

Corporate and other costs were $15.4 million, or 7.0% of revenues, for the nine months ended September 30, 2020 compared to $11.0 million, or 6.6% of revenues, for the nine months ended September 30, 2019. The increase was driven by public company costs, higher headcount in sales and marketing, human resources, information technology, safety and finance, which were made in 2019 in support of anticipated acquisitions and revenue growth, as well as higher legal costs, partially offset by lower travel costs and internal labor costs capitalized as part of the ERP implementation.

Liquidity and Capital Resources

Liquidity describes the ability of a company to generate sufficient cash flows to meet the cash requirements of its business operations, including working capital needs, debt service, acquisitions, other commitments and contractual obligations. We consider liquidity in terms of cash flows from operations and other sources, including availability under our credit facility, and their sufficiency to fund our operating and investing activities.

Our principal sources of liquidity have been borrowings under our credit facility, prior senior secured credit facility and other borrowing arrangements and cash generated by operating activities. Historically, we have financed our operations and acquisitions from a combination of cash generated from operations, periodic borrowings under our credit facility, prior senior secured credit facility and other prior secured and unsecured borrowings and proceeds from the issuance of common and preferred stock. Our primary cash needs are for day to day operations, to fund working capital requirements, to fund our acquisition strategy, to pay interest and principal on our indebtedness and Series A-2 preferred stock and to make capital expenditures. Additionally, the CTEH acquisition agreement includes an earn-out provision that provides for the payment of contingent consideration based on CTEH’s 2020 and 2021 results in an aggregate amount not to exceed $80.0 million, with each payment equal to a specified multiple of CTEH’s EBITDA for the relevant year in excess of specified targets. Any earn-out to be paid in respect of fiscal years 2020 and 2021 will be capped at $50.0 million and $30.0 million, respectively, with any payment in respect of 2020 payable, at our discretion, entirely in cash or 50.0% in cash and 50.0% in common stock, and any payment in respect of 2021 payable in cash. See Note 6 to our unaudited condensed consolidated financial statements.  

We expect to continue to finance our liquidity requirements, including any cash earn-out payments that may be required in connection with acquisitions, through cash generated from operations and borrowings under our credit facility. We believe these sources will be sufficient to fund our cash needs for the next twelve months. See “COVID-19” above for a discussion of the impact of the pandemic on our liquidity.

Cash Flows

The following table summarizes our cash flows for the periods presented:

	Nine Months Ended September 30,
(in thousands)	2020			2019
Consolidated Statement of Cash flows data:
Net cash (used in) provided by operating activities	$	(3,877	)	$	12,547
Net cash used in investing activities		(176,840	)		(84,141	)
Net cash provided by financing activities		212,167			77,253
Change in cash, cash equivalents and restricted cash	$	31,450		$	5,659

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Operating Activities

Cash flows from operating activities can fluctuate from period-to-period as earnings, working capital needs and the timing of payments for contingent consideration, taxes, bonus payments and other operating items impact reported cash flows. For the nine months ended September 30, 2020, net cash used in operating activities was $3.9 million, a decrease of $16.4 million, when compared to net cash provided by operating activities of $12.5 million for the nine months ended September 30, 2019. This decrease in cash flows from operating activities in the nine months ended September 30, 2020 primarily reflects higher contingent consideration payments of $6.4 million, higher non-capitalizable IPO-related costs of $6.8 million, higher interest payments of $6.7 million, an increase in change in working capital of $6.3 million, higher acquisition related costs of $1.4 million, and higher cloud computing costs of $2.1 million (related to the implementation of new ERP and CRM (Customer Relationship Management) systems), partially offset by lower taxes paid, when compared to the prior year. Working capital increased by $7.8 million in the nine months ended September 30, 2020, due primarily to an increase in contract assets of $7.7 million (as a result of higher operating activity in the quarter ended September 30, 2020), an increase in pre-paid expenses and a decrease in accounts payable, partially offset by an increase in accrued payroll and benefits, compared to an increase in working capital of $1.6 million in the nine months ended September 30, 2019, which was driven by an increase in accounts receivable of $2.7 million, partially offset by an increase in accrued payroll and benefits. Excluding contingent consideration payments and non-capitalizable IPO-related costs, cash flow from operating activities decreased $3.2 million, primarily due to higher working capital caused by higher-than anticipated growth in revenues in our Assessment, Permitting and Response and Measurement and Analysis segments.

Investing Activities

For the nine months ended September 30, 2020, net cash used in investing activities was $176.8 million, primarily driven by cash paid for the acquisition of CTEH, net of cash acquired, of $170.7 million, as well as purchases of property and equipment for cash consideration of $5.4 million.

For the nine months ended September 30, 2019, net cash used in investing activities was $84.1 million, primarily driven by cash paid for acquisitions, net of cash acquired, of $81.4 million, as well as purchases of property and equipment for cash consideration of $2.8 million.

Financing Activities

For the nine months ended September 30, 2020, net cash provided by financing activities was $212.2 million. Cash provided by financing activities was driven by IPO proceeds, net of underwriting fees, of $161.3 million, borrowings under the Unitranche credit facility, consisting of $175.0 million under the term loan and $25.0 million under the revolver, as well as net proceeds of $173.7 million from the issuance of the Series A-2 preferred stock. Proceeds from the IPO were used primarily to repay the $131.8 million Series A-1 preferred stock (along with the issuance of shares of common stock), as well as to pay IPO offering costs of $2.9 million. Proceeds from the Unitranche Credit Facility were used primarily to repay the $177.5 million outstanding under the prior senior credit facility, whereas proceeds from the issuance of the Series A-2 preferred stock were used to finance the acquisition of CTEH. Cash from financing activities was also used to repay the $25.0 million outstanding revolver balance and to make payments of acquisition-related contingent consideration of $6.0 million, term loan amortization payments of $1.3 million and $0.5 million related to our prior senior secured credit facility and current Unitranche credit facility, respectively, the payment of debt issuance and debt extinguishment costs of $5.2 million and the payment of the third quarter dividend on the Series A-2 preferred stock of $2.9 million.

For the nine months ended September 30, 2019, net cash provided by financing activities was $77.3 million. Cash provided by financing activities was driven by a $80.0 million increase in net borrowings under our prior senior secured credit facility, partially offset by the payment of acquisition-related contingent consideration of $1.1 million and the repayment of capital leases of $1.3 million.

Credit Facility

On April 13, 2020, we entered into a Unitranche Credit Agreement providing for a new $225.0 million credit facility comprised of a $175.0 million term loan and a $50.0 million revolving credit facility, and used a portion of the proceeds from the new credit facility to repay all amounts outstanding under the prior senior secured credit facility. The credit facility matures on the earliest of (a) April 13, 2025 and (b) so long as our Series A-2 preferred stock has not been redeemed in full or otherwise not converted into common stock of Montrose, the date that is 180 days before the Series A-2 preferred equity mandatory redemption date, unless prior to such date, the Series A-2 preferred equity mandatory redemption date has been extended to a date not earlier than one hundred eighty (180) days after April 13, 2025. As of September 30, 2020, the term loan bore interest at a rate of LIBOR plus 5.0% (subject to a 1.0% LIBOR floor) or the base rate plus 4.0%. Effective October 6, 2020, we amended the credit facility to provide for a reduction on the applicable interest rate on the term loan from LIBOR plus 5.0% with a 1.0% LIBOR floor to LIBOR plus 4.5% with a 1.0% LIBOR floor. The revolver bears interest at a rate of LIBOR plus 3.5% or the base rate plus 2.5%. The revolver is also subject to an unused commitment fee of 0.35%. The term loan begins amortizing quarterly with fiscal quarter ending September 30, 2020, with a

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required repayment of (a) $0.5 million for fiscal quarter ending September 30, 2020 and each other fiscal quarter through and including June 30, 2021, (b) $1.1 million for fiscal quarter ending September 30, 2021 and each other fiscal quarter through and including June 30, 2022, and (c) $1.6 million for each fiscal quarter ending thereafter. We have the option to borrow incremental term loans up to an aggregate principal amount of $100.0 million subject to the satisfaction of certain conditions, including the borrower’s pro forma compliance with the financial covenants under the credit facility. Immediately after giving effect to the incurrence of any such incremental term loans, the unitranche lenders must collectively hold at least 70% of all pari passu debt of all lenders under the credit facility. The existing lenders are not obligated to participate in any incremental term loan facility.

Our obligations under the new credit facility are guaranteed by certain of our existing and future direct and indirect subsidiaries, and such obligations are secured by substantially all of our assets. The credit facility includes a number of covenants imposing certain restrictions on our business, including, among other things, restrictions on our ability to incur indebtedness, prepay or amend other indebtedness, create liens, make certain fundamental changes including mergers or dissolutions, pay dividends and make other payments in respect of capital stock, make certain investments, sell assets, change our lines of business, enter into transactions with affiliates and other corporate actions. The credit facility also contains financial covenants requiring us to remain below a maximum consolidated total leverage ratio of 4.25 times, which steps down to 4.00 times beginning December 31, 2021 and then to 3.75 times beginning December 31, 2022, and a minimum consolidated fixed charge coverage ratio of 1.25 times.

The new credit facility contains mandatory prepayment feature upon a number of events, including with the proceeds of certain asset sales, proceeds from the issuance of any debt and proceeds of the capital contribution amounts contributed to cure a financial covenant default. The credit facility also includes mandatory prepayments of 50.0% of excess cash flow minus voluntary prepayments of the term loan and, solely to the extent accompanied by a permanent reduction in the revolving commitment, the revolving loan, if our consolidated total leverage ratio for the year ending December 31, 2020 is greater than or equal to 3.25 times and, for any year thereafter, the amount of any such mandatory prepayment shall be reduced to 25.0% of excess cash flow if the leverage ratio is less than 3.00 times. As of September 30, 2020, the Company’s leverage ratio, which includes the impact of contingent consideration payable in cash, was 2.89 times. Excluding contingent consideration of $9.6 million related to CTEH estimated 2021 earnings, an amount which may vary given the environmental emergency response nature of their work, our leverage ratio was 2.7 times as of September 30, 2020. The weighted average interest rate on the new credit facility as of September 30, 2020 was 6.0%.

Our prior senior secured credit facility consisted of a $50.0 million term loan and a $130.0 million revolving credit facility.

Borrowings under the prior senior secured credit facility bore interest at either (i) LIBOR plus the applicable margin or (ii) a base rate (equal to the highest of (a) the federal funds rate plus 0.5%, (b) Bank of America, N.A.’s prime rate and (c) the Eurocurrency Rate, which is based on LIBOR, (using a one-month period plus 1.0%), plus the applicable margin, as we elected). The applicable margin meant a percentage per annum determined in accordance with the following table:

Pricing Tier	Consolidated Leverage Ratio	Commitment Fee			Eurodollar Rate Loans and LIBOR Letter of Credit Fee			Daily Floating Rate Loans			Rate Loans
1	> 3.75 to 1.0		0.50	%		4.00	%		4.00	%		3.00	%
2	≤ 3.75 to 1.0 but > 3.00 to 1.0		0.50			3.50			3.50			2.50
3	≤ 3.00 to 1.0 but > 2.25 to 1.0		0.40			3.00			3.00			2.00
4	< 2.25 to 1.0		0.30			2.50			2.50			1.50

The weighted average interest rate on the prior senior secured credit facility as of March 31, 2020 was 4.95%. All amounts outstanding under the prior senior secured credit facility were repaid on April 13, 2020.

See Note 12 to our unaudited condensed consolidated financial statements.

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Series A-1 Preferred Stock

On October 19, 2018, we issued 12,000 shares of our Series A-1 preferred stock. The Series A-1 preferred stock accrued dividends quarterly at an annual rate of 15.0% with respect to any dividends paid in cash and at an annual rate of 14.2%, compounded quarterly with respect to dividends that are accrued. In the event of a redemption, a holder is guaranteed a minimum of either two or three years of dividends depending on the nature of the redemption. Total accrued and unpaid dividends as of December 31, 2019 were $21.9 million. As of December 31, 2019, we were subject to a maximum consolidated total leverage ratio, including the outstanding principal and accrued dividend on the Series A-1 preferred stock, of 10.0 times as of the end of any fiscal quarter until maturity. We were in compliance with the covenants as of December 31, 2019 and December 31, 2018.

On July 27, 2020, the Company redeemed in full the Redeemable Series A-1 Preferred Stock, including the guaranteed minimum two-year dividend. The Company used $131.8 million of the IPO proceeds and 1,786,739 shares of common stock to redeem all outstanding shares of the Company’s Redeemable Series A-1 Preferred Stock.

See Note 15 to our unaudited September 30, 2020 condensed consolidated financial statements.

Series A-2 Preferred Stock

On April 13, 2020, the Company issued 17,500 shares of the Series A-2 preferred stock with a par value of $0.0001 per share and a warrant to purchase common stock, in exchange for $175.0 million. Prior to the effectiveness of the Company’s initial public offering, each share of Series A-2 preferred stock accrued dividends at the rate of 15.0% per annum with respect to dividends that are paid in cash, and 14.2% per annum, with respect to dividends that accrue and compound before a private offering (in certain circumstances), resulting in an annual dividend rate of 15.0%, and 9.0% per annum after an initial public offering or private offering (in certain circumstances). Following the completion of the Company’s initial public offering, the Series A-2 preferred stock does not mature or have a cash repayment obligation; however, it is redeemable at the Company’s option. The Series A-2 preferred stock becomes convertible into our common stock beginning on the four-year anniversary of the Series A-2 preferred stock issuance. Upon the four-year anniversary of the issuance, holders of Series A-2 preferred stock may convert up to $60.0 million of such shares into our common stock at a conversion rate discounted to 85.0% of the volume weighted average trading value, with the permitted amount of Series A-2 preferred stock to be converted increasing at each subsequent anniversary of the issuance until the sixth anniversary, after which all of the Series A-2 preferred stock may be converted at the holder’s option. Following the completion of the Company’s initial public offering and redemption of the Series A-1 preferred stock on July 27, 2020 with a portion of the proceeds therefrom and newly issued shares of common stock, the Series A-2 preferred stock dividend rate changed to 9.0% per annum with required quarterly cash payments. If permitted under our existing debt facilities, we must pay the Series A-2 preferred stock dividend in cash each quarter.

With respect to any redemption of any share of the Series A-2 preferred stock prior to April 13, 2023, the Company is subject to a make whole penalty in which the holder is guaranteed at least three years of dividend payments on the redeemed amount.

See Note 16 to our unaudited condensed consolidated financial statements.

Off-Balance Sheet Arrangements

We did not have during the period presented, and we do not currently have, any off-balance sheet financing arrangements or any relationships with unconsolidated entities or financial partnerships, including entities sometimes referred to as structured finance or special purpose entities, that were established for the purpose of facilitating off-balance sheet arrangements or other contractually narrow or limited purposes.

Critical Accounting Policies and Estimates

Our Final Prospectus filed with the SEC on July 22, 2020 includes a summary of the critical accounting policies we believe are the most important to aid in understanding our financial results. There have been no material changes to those critical accounting policies as disclosed therein.

JOBS Act Accounting Election

We are an emerging growth company, as defined in the JOBS Act. Under the JOBS Act, emerging growth companies can delay adopting new or revised accounting standards issued subsequent to the enactment of the JOBS Act until such time as those standards apply to private companies. We have elected to use this extended transition period for complying with new or revised accounting standards that have different effective dates for public and private companies until the earlier of the date we (1) are no longer an emerging growth company or (2) affirmatively and irrevocably opt out of the extended transition period provided in the JOBS Act. As a result, our financial statements may not be comparable to companies that comply with new or revised accounting pronouncements as of public company effective dates.

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NON-GAAP Financial Information

In addition to our results under GAAP, management uses other supplemental financial measures of financial performance that are not required by, or presented in accordance with, GAAP, including Adjusted EBITDA and Adjusted EBITDA margin. We calculate Adjusted EBITDA as net income (loss) before interest expense, income tax expense (benefit) and depreciation and amortization, adjusted for the impact of certain other items, including stock-based compensation expense and acquisition-related costs, as set forth in greater detail in the table below. Adjusted EBITDA margin represents Adjusted EBITDA as a percentage of revenues for a given period.

Adjusted EBITDA and Adjusted EBITDA margin are two of the primary metrics used by management to evaluate our financial performance and compare it to that of our peers, evaluate the effectiveness of our business strategies, make budgeting and capital allocation decisions and in connection with our executive incentive compensation. These measures are also frequently used by analysts, investors and other interested parties to evaluate companies in our industry. Further, we believe they are helpful in highlighting trends in our operating results because they allow for more consistent comparisons of financial performance between periods by excluding gains and losses that are non-operational in nature or outside the control of management, as well as items that may differ significantly depending on long-term strategic decisions regarding capital structure, the tax jurisdictions in which we operate and capital investments.

These non-GAAP measures do, however, have certain limitations and should not be considered as an alternative to net income or any other performance measure derived in accordance with GAAP. Our presentation of Adjusted EBITDA and Adjusted EBITDA margin should not be construed as an inference that our future results will be unaffected by unusual or non-recurring items for which we may make adjustments. In addition, Adjusted EBITDA and Adjusted EBITDA margin may not be comparable to similarly titled measures used by other companies in our industry or across different industries, and other companies may not present these or similar measures. Management compensates for these limitations by using these measures as supplemental financial metrics and in conjunction with our results prepared in accordance with GAAP. We encourage investors and others to review our financial information in its entirety, not to rely on any single measure and to view Adjusted EBITDA and Adjusted EBITDA margin in conjunction with the related GAAP measures.

The following is a reconciliation of our net loss to Adjusted EBITDA:

	For the Three Months Ended September 30,						For the Nine Months Ended September 30,
(in thousands)	2020			2019			2020			2019
Net loss	$	(30,737	)	$	(6,683	)	$	(58,761	)	$	(12,247	)
Interest expense		3,043			2,130			10,896			4,590
Income tax expense (benefit)		3,348			(412	)		(1,563	)		(1,308	)
Depreciation and amortization		9,740			7,412			27,084			20,262
EBITDA	$	(14,606	)	$	2,447		$	(22,344	)	$	11,297
Stock-based compensation (1)		1,149			1,055			3,439			3,577
Start-up losses and investment in new services (2)		602			438			1,283			608
Acquisition costs (3)		6			1,278			3,767			2,350
Fair value changes in contingent put option (4)		(26,265	)		—			(19,240	)		—
Fair value changes in warrant options (4)		9,311			2,510			9,312			4,059
Fair value changes in compound embedded option (5)		26,664			—			27,420			—
Fair value changes in business acquisitions    contingent consideration (6)		13,404			256			17,387			(670	)
Short term purchase accounting fair value adjustment    to deferred revenue (7)		—			—			243			—
IPO preparation costs (8)		6,378			20			6,908			105
Discontinued Service Lines (9)		30			37			7,526			(632	)
Expenses related to financing transactions (10)		—			—			277			—
Other losses and expenses (11)		33			19			179			27
Adjusted EBITDA	$	16,706		$	8,060		$	36,157		$	20,721

(1) Represents non-cash stock-based compensation expenses related to option awards issued to employees and restricted stock grants issued to directors.

(2) Represent start-up losses related to losses incurred on (i) the expansion of lab testing methods and lab capacity, including into new geographies, (ii) expansion of our Remediation services into new geographies, (iii) expansion into Europe in advance of projects driven by new regulations and (iv) expansion of our remediation business line into new geographies.

47

(3) Acquisition costs include financial and tax diligence, consulting, legal, valuation, accounting and travel costs and acquisition-related incentives related to our acquisition activity.

(4) Amounts relate to the change in fair value of the contingent put option attached to the Series A-1 and the warrant options attached to the Series A-1 and Series A-2 preferred stock.

(5) Amounts relate to the change in fair value of the Series A-2 compound embedded derivative.

(6) Fair value changes in value of business acquisitions contingent consideration, reflects the difference between the expected settlement value of acquisition related earn-out payments at the time of the closing of acquisitions and the expected (or actual) value of earn-outs at the end of the relevant period.

(7) Purchase accounting fair value adjustment to deferred revenue represents the impact of the fair value adjustment to the carrying value of deferred revenue as of the date of acquisition of ECT2.

(8) IPO preparation costs relate to expenses incurred by us to prepare for the Company’s initial public offering, as well as costs from IPO-related bonuses.

(9) Represents (earnings) loss from the Discontinued Service Lines. See the section entitled “Management’s Discussion and Analysis of Financial Condition and Results of Operations—Key Factors that Affect Our Business and Our Results.”

(10) Non-capitalizable expenses associated with the issuance of the Convertible and Redeemable Series A-2 Preferred Stock.

(11) Represents non-operational charges incurred as a result of lease abandonments.

48

Item 3. Quantitative and Qualitative Disclosures About Market Risk.

Interest Rate Risk

We have market risk exposure arising from changes in interest rates on our credit facility, which bears interest at rates that are benchmarked against LIBOR. Based on our overall interest rate exposure to variable rate debt outstanding as of September 30, 2020, a 1.0% increase in interest rates above the 1.0% LIBOR floor on the term loan would increase annual income (loss) before income taxes by approximately $1.7 million. Due to the 1.0% LIBOR floor under the terms of the term loan, and the LIBOR rate of 0.16% in effect on the revolver at September 30, 2020, any decrease in LIBOR rates would have had a de minimis benefit to annual income (loss) before income taxes.

Impact of Inflation

Our results of operations and financial condition are presented based on historical cost. While it is difficult to accurately measure the impact of inflation due to the imprecise nature of the estimates required, we believe the effects of inflation, if any, on our results of operations and financial condition have been immaterial. We cannot assure you, however, that our results of operations and financial condition will not be materially impacted by inflation in the future.

Item 4. Controls and Procedures.

Evaluation of Disclosure Controls and Procedures

As required by Rule 13a-15(b) under the Exchange Act, our management, including our Chief Executive Officer and Chief Financial Officer, carried out an evaluation of the effectiveness of the design and operation of our disclosure controls and procedures (as defined in Rule 13a-15(e) under the Exchange Act), as of September 30, 2020, the end of the period covered by this Quarterly Report on Form 10-Q.  Based on the foregoing, our Chief Executive Officer and Chief Financial Officer concluded that, as of September 30, 2020, the end of the period covered by this Quarterly Report on Form 10-Q, our disclosure controls and procedures were effective at the reasonable assurance level.

Internal Control Over Financial Reporting

There were no changes in our internal control over financial reporting (as defined in Rule 13a-15(f) under the Exchange Act) that occurred during the quarter ended September 30, 2020, that have materially affected, or are reasonably likely to materially affect, our internal control over financial reporting.

Limitations on Effectiveness of Controls

Our management, including our principal executive officer and principal financial officer, does not expect that our disclosure controls and procedures or our system of internal control over financial reporting will prevent or detect all errors and all fraud. A control system, no matter how well designed or operated, can provide only reasonable, but not absolute, assurance that the objectives of the system of internal control are met. The design of our control system reflects the fact that there are resource constraints, and that the benefits of such control system must be considered relative to their costs. Further, because of the inherent limitations in all control systems, no evaluation of controls can provide absolute assurance that all control failures and instances of fraud, if any, within the Company have been detected. These inherent limitations include the realities that judgments in decision-making can be faulty and that breakdowns can occur because of simple error or mistake. Additionally, controls can be circumvented by the intentional acts of individuals, by collusion of two or more people, or by management override of the controls. The design of any system of controls is also based in part on certain assumptions about the likelihood of future events, and there can be no assurance that the design of any particular control will always succeed in achieving its objective under all potential future conditions.

49

PART II—OTHER INFORMATION

Item 1. Legal Proceedings.

From time to time, we are subject to various legal proceedings that arise in the normal course of our business activities, including those involving labor and employment, anti-discrimination, commercial disputes and other matters. We are not a party to any litigation the outcome of which, if determined adversely to us, would individually or in the aggregate be reasonably expected to have a material adverse effect on our results of operations or financial position. Regardless of outcome, litigation can have an adverse impact on us because of defense and settlement costs, diversion of management resources and other factors.  

Item 1A. Risk Factors.

There have been no material changes to our risk factors from the risk factors disclosed in our Final Prospectus dated July 22, 2020, filed in connection with our initial public offering. The risks described in our Final Prospectus, in addition to the other information set forth in this Quarterly Report on Form 10-Q, are not the only risks facing we face. Additional risks and uncertainties not currently known to us or that we currently deem to be immaterial also may materially adversely affect our business, financial condition and/or operating results.

Item 2. Unregistered Sales of Equity Securities and Use of Proceeds.

Unregistered Sales of Equity Securities

On July 27, 2020, we issued an aggregate of 1,786,739 shares of common stock to an accredited investor as partial consideration for the redemption of all issued and outstanding shares of our Series A-1 preferred stock.  The shares of common stock were valued at $15.00 per share, the public offering price in our initial public offering. The issuance of the shares of common stock was exempt from the registration requirements of the Securities Act pursuant to Section 4(a)(2) thereof as a transaction by an issuer not involving any public offering.

On July 30, 2020, we issued an aggregate of 2,534,239 shares of common stock to two accredited investors in connection with the exercise by each of a warrant to purchase shares of common stock with an exercise price of $0.01 per share of common stock. These issuances were exempt from the registration requirements of the Securities Act pursuant to Section 4(a)(2) thereof as transactions by an issuer not involving any public offering.

Use of Proceeds

In connection with our initial public offering, we filed a Registration Statement on Form S-1 (File No. 333-239542) on June 29, 2020. The SEC declared the registration statement effective on July 22, 2020.  Other than an additional $0.5 million of IPO costs that were paid from the proceeds of the offering, there were no changes to the information disclosed in our Quarterly Report on Form 10-Q filed with the SEC on August 31, 2020 regarding our use of proceeds from the offering.

Item 3. Defaults Upon Senior Securities.

None.

Item 4. Mine Safety Disclosures.

Not applicable.

Item 5. Other Information.

None.

50

Item 6. Exhibits.

Exhibit Number	Description
10.1	Letter Amendment, dated October 6, 2020 to Credit Agreement by and among Montrose Environmental Group, Inc., Unitranche Loan Transaction LLC and Capital One, National Association (filed as exhibit 10.1 to the Company’s Current Report on Form 8-K filed with the SEC on October 7, 2020 and incorporated herein by reference).
31.1*	Certification of Principal Executive Officer Pursuant to Rules 13a-14(a) and 15d-14(a) under the Securities Exchange Act of 1934, as Adopted Pursuant to Section 302 of the Sarbanes-Oxley Act of 2002.
31.2*	Certification of Principal Financial Officer Pursuant to Rules 13a-14(a) and 15d-14(a) under the Securities Exchange Act of 1934, as Adopted Pursuant to Section 302 of the Sarbanes-Oxley Act of 2002.
32.1**	Certification of Principal Executive Officer Pursuant to 18 U.S.C. Section 1350, as Adopted Pursuant to Section 906 of the Sarbanes-Oxley Act of 2002.
32.2**	Certification of Principal Financial Officer Pursuant to 18 U.S.C. Section 1350, as Adopted Pursuant to Section 906 of the Sarbanes-Oxley Act of 2002.
101.INS	XBRL Instance Document
101.SCH	XBRL Taxonomy Extension Schema Document
101.CAL	XBRL Taxonomy Extension Calculation Linkbase Document
101.DEF	XBRL Taxonomy Extension Definition Linkbase Document
101.LAB	XBRL Taxonomy Extension Label Linkbase Document
101.PRE	XBRL Taxonomy Extension Presentation Linkbase Document

* Filed herewith.

** Exhibit is furnished and shall not be deemed “filed” for purposes of Section 18 of the Exchange Act, or otherwise subject to the liabilities of that section, nor shall it be deemed incorporated by reference in any filing under the Securities Act, or the Exchange Act, except as shall be expressly set forth by specific reference in such filing.

51

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned thereunto duly authorized.

	Montrose Environmental Group, Inc.
Date:  November 12, 2020	By:	/s/ Allan Dicks
		Allan Dicks
		Chief Financial Officer

52

EX-31.1

Exhibit 31.1

CERTIFICATION PURSUANT TO

RULES 13a-14(a) AND 15d-14(a) UNDER THE SECURITIES EXCHANGE ACT OF 1934,

AS ADOPTED PURSUANT TO SECTION 302 OF THE SARBANES-OXLEY ACT OF 2002

I, Vijay Manthripragada, certify that:

1. I have reviewed this Quarterly Report on Form 10-Q of Montrose Environmental Group, Inc.;

2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3. Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4. The registrant's other certifying officer(s) and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) for the registrant and have:

(a) Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

(b) Evaluated the effectiveness of the registrant's disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

(c) Disclosed in this report any change in the registrant's internal control over financial reporting that occurred during the registrant's most recent fiscal quarter (the registrant's fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant's internal control over financial reporting; and

5. The registrant's other certifying officer(s) and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant's auditors and the audit committee of the registrant's board of directors (or persons performing the equivalent functions):

(a) All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant's ability to record, process, summarize and report financial information; and

(b) Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant's internal control over financial reporting.

Date: November 12, 2020	By:	/s/ Vijay Manthripragada
		Vijay Manthripragada
		Chief Executive Officer (Principal Executive Officer)

EX-31.2

Exhibit 31.2

CERTIFICATION PURSUANT TO

RULES 13a-14(a) AND 15d-14(a) UNDER THE SECURITIES EXCHANGE ACT OF 1934,

AS ADOPTED PURSUANT TO SECTION 302 OF THE SARBANES-OXLEY ACT OF 2002

I, Allan Dicks, certify that:

1. I have reviewed this Quarterly Report on Form 10-Q of Montrose Environmental Group, Inc.;

2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3. Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4. The registrant's other certifying officer(s) and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) for the registrant and have:

(a) Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

(b) Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles; and

(c) Disclosed in this report any change in the registrant's internal control over financial reporting that occurred during the registrant's most recent fiscal quarter (the registrant's fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant's internal control over financial reporting; and

5. The registrant's other certifying officer(s) and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant's auditors and the audit committee of the registrant's board of directors (or persons performing the equivalent functions):

(a) All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant's ability to record, process, summarize and report financial information; and

(b) Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant's internal control over financial reporting.

Date: November 12, 2020	By:	/s/ Allan Dicks
		Allan Dicks
		Chief Financial Officer (Principal Financial Officer)

EX-32.1

Exhibit 32.1

CERTIFICATION PURSUANT TO

18 U.S.C. SECTION 1350, AS ADOPTED PURSUANT TO

SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

In connection with the Quarterly Report of Montrose Environmental Group, Inc. (the “Company”) on Form 10-Q for the quarter ended September 30, 2020 as filed with the Securities and Exchange Commission on the date hereof (the “Report”), I, Vijay Manthripragada, Chief Executive Officer of the Company, certify pursuant to 18 U.S.C. § 1350, as adopted pursuant to § 906 of the Sarbanes-Oxley Act of 2002, that:

(1) The Report fully complies with the requirements of section 13(a) or 15(d) of the Securities Exchange Act of 1934; and

(2) The information contained in the Report fairly presents, in all material respects, the financial condition and result of operations of the Company.

Date:  November 12, 2020	By:	/s/ Vijay Manthripragada
		Vijay Manthripragada
		Chief Executive Officer (Principal Executive Officer)

A signed original of this written statement required by Section 906 has been provided to Montrose Environmental Group, Inc. and will be retained by Montrose Environmental Group, Inc. and furnished to the Securities and Exchange Commission or its staff upon request.

EX-32.2

Exhibit 32.2

CERTIFICATION PURSUANT TO

18 U.S.C. SECTION 1350, AS ADOPTED PURSUANT TO

SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

In connection with the Quarterly Report of Montrose Environmental Group, Inc. (the “Company”) on Form 10-Q for the quarter ended September 30, 2020 as filed with the Securities and Exchange Commission on the date hereof (the “Report”), I, Allan Dicks, Chief Financial Officer of the Company, certify pursuant to 18 U.S.C. § 1350, as adopted pursuant to § 906 of the Sarbanes-Oxley Act of 2002, that:

(1) The Report fully complies with the requirements of section 13(a) or 15(d) of the Securities Exchange Act of 1934; and

(2) The information contained in the Report fairly presents, in all material respects, the financial condition and result of operations of the Company.

Date: November 12, 2020	By:	/s/ Allan Dicks
		Allan Dicks
		Chief Financial Officer (Principal Financial Officer)

A signed original of this written statement required by Section 906 has been provided to Montrose Environmental Group, Inc. and will be retained by Montrose Environmental Group, Inc. and furnished to the Securities and Exchange Commission or its staff upon request.

XML

Document and Entity Information - shares	9 Months Ended
	Sep. 30, 2020	Nov. 11, 2020
Cover [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Sep. 30, 2020
Document Quarterly Report	true
Document Transition Report	false
Document Fiscal Year Focus	2020
Document Fiscal Period Focus	Q3
Trading Symbol	MEG
Entity Registrant Name	Montrose Environmental Group, Inc.
Entity Central Index Key	0001643615
Current Fiscal Year End Date	--12-31
Entity Filer Category	Non-accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	true
Entity Ex Transition Period	false
Entity Common Stock, Shares Outstanding		24,961,680
Entity Interactive Data Current	Yes
Entity Current Reporting Status	Yes
Entity Shell Company	false
Entity File Number	001-39394
Entity Tax Identification Number	46-4195044
Entity Incorporation State Country Code	DE
Entity Address Address Line1	1 Park Plaza
Entity Address, Address Line Two	Suite 1000
Entity Address City Or Town	Irvine
Entity Address State Or Province	CA
Entity Address Postal Zip Code	92614
City Area Code	949
Local Phone Number	988-3500
Security12b Title	Common Stock, par value $0.000004 per share
Security Exchange Name	NYSE

XML

UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF FINANCIAL POSITION - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
CURRENT ASSETS:
Cash and restricted cash	$ 38,377	$ 6,884
Accounts receivable—net	44,785	45,927
Contract assets	35,441	13,605
Prepaid and other current assets	8,585	6,823
Total current assets	127,188	73,239
NON-CURRENT ASSETS:
Property and equipment—net	34,559	27,036
Goodwill	274,309	127,058
Other intangible assets—net	162,201	102,549
Other assets	4,081	1,956
TOTAL ASSETS	602,338	331,838
CURRENT LIABILITIES:
Accounts payable and other accrued liabilities	33,897	29,585
Accrued payroll and benefits	17,957	11,032
Warrant option		16,878
Business acquisitions contingent consideration, current	49,170	8,614
Current portion of long-term debt	5,034	7,143
Total current liabilities	106,058	73,252
NON-CURRENT LIABILITIES:
Business acquisitions contingent consideration, long-term	9,742	379
Other non-current liabilities	3,431
Deferred tax liabilities—net	1,936	3,530
Long-term debt—net of deferred financing fees	171,417	145,046
Total liabilities	310,643	229,307
COMMITMENTS AND CONTINGENCIES
STOCKHOLDERS’ EQUITY (DEFICIT):
Additional paid-in-capital	261,945	38,153
Accumulated deficit	(123,165)	(64,404)
Accumulated other comprehensive loss	(13)	(40)
Total stockholders’ equity (deficit)	138,767	(26,291)
TOTAL LIABILITIES, REDEEMABLE SERIES A-1 PREFERRED STOCK, CONVERTIBLE AND REDEEMABLE SERIES A-2 PREFERRED STOCK AND STOCKHOLDERS’ EQUITY (DEFICIT)	602,338	331,838
Conversion Option
NON-CURRENT LIABILITIES:
Embedded derivative	18,059
Contingent Put Option
NON-CURRENT LIABILITIES:
Embedded derivative		7,100
Redeemable Series A-1 Preferred Stock
NON-CURRENT LIABILITIES:
REDEEMABLE SERIES PREFERRED STOCK		$ 128,822
Convertible And Redeemable Series A-2 Preferred Stock
NON-CURRENT LIABILITIES:
REDEEMABLE SERIES PREFERRED STOCK	$ 152,928

XML

UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF FINANCIAL POSITION (Parenthetical) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Common stock, par value	$ 0.000004	$ 0.000004
Common stock, shares authorized	190,000,000	25,000,000
Common stock, shares issued	24,893,122	8,370,107
Common stock, shares outstanding	24,893,122	8,370,107
Redeemable Series A-1 Preferred Stock
Temporary equity, par value	$ 0.0001	$ 0.0001
Temporary equity, shares authorized	0	12,000
Temporary equity, shares issued	0	12,000
Temporary equity, shares outstanding	0	12,000
Temporary equity, aggregate liquidation preference	$ 0	$ 141,898
Convertible And Redeemable Series A-2 Preferred Stock
Temporary equity, par value	$ 0.0001	$ 0.0001
Temporary equity, shares authorized	17,500	0
Temporary equity, shares issued	17,500	0
Temporary equity, shares outstanding	17,500	0
Temporary equity, aggregate liquidation preference	$ 182,200	$ 0

XML

UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE LOSS - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Income Statement [Abstract]
REVENUES	$ 84,705	$ 57,623	$ 219,502	$ 165,978
COST OF REVENUES (exclusive of depreciation and amortization shown below)	51,828	39,804	142,115	116,248
SELLING, GENERAL AND ADMINISTRATIVE EXPENSE	24,442	12,656	64,810	35,464
FAIR VALUE CHANGES IN BUSINESS ACQUISITIONS CONTINGENT CONSIDERATION	13,404	256	17,387	(670)
DEPRECIATION AND AMORTIZATION	9,740	7,412	27,084	20,262
LOSS FROM OPERATIONS	(14,709)	(2,505)	(31,894)	(5,326)
OTHER EXPENSE
Other expense	(9,637)	(2,460)	(17,534)	(3,639)
Interest expense—net	(3,043)	(2,130)	(10,896)	(4,590)
Total other expenses—net	(12,680)	(4,590)	(28,430)	(8,229)
LOSS BEFORE EXPENSE (BENEFIT) FROM INCOME TAXES	(27,389)	(7,095)	(60,324)	(13,555)
INCOME TAXES EXPENSE (BENEFIT)	3,348	(412)	(1,563)	(1,308)
NET LOSS	(30,737)	(6,683)	(58,761)	(12,247)
EQUITY ADJUSTMENT FROM FOREIGN CURRENCY TRANSLATION	80	(20)	27	3
COMPREHENSIVE LOSS	(30,657)	(6,703)	(58,734)	(12,244)
ACCRETION OF REDEEMABLE SERIES A-1 PREFERRED STOCK	(6,542)	(5,030)	(17,601)	(14,341)
REDEEMABLE SERIES A-1 PREFERRED STOCK DEEMED DIVIDEND	(24,341)		(24,341)
CONVERTIBLE AND REDEEMABLE SERIES A-2 PREFERRED STOCK DIVIDEND	(2,870)		(2,870)
NET LOSS ATTRIBUTABLE TO COMMON STOCKHOLDERS	$ (64,490)	$ (11,713)	$ (103,573)	$ (26,588)
WEIGHTED AVERAGE COMMON SHARES OUTSTANDING— BASIC AND DILUTED	21,554	8,718	13,669	8,640
NET LOSS PER SHARE ATTRIBUTABLE TO COMMON STOCKHOLDERS— BASIC AND DILUTED	$ (2.99)	$ (1.34)	$ (7.58)	$ (3.08)

XML

UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF REDEEMABLE SERIES A-1 PREFERRED STOCK, CONVERTIBLE AND REDEEMABLE SERIES A-2 PREFERRED STOCK AND STOCKHOLDERS' EQUITY (DEFICIT) - USD ($) $ in Thousands	Total	Redeemable Series A-1 Preferred Stock	Convertible And Redeemable Series A-2 Preferred Stock	Common Stock	Additional Paid-In Capital	Accumulated Deficit	Notes Receivable from Stockholders	Accumulated Other Comprehensive Income (Loss)
Beginning balance at Dec. 31, 2018	$ 6,900				$ 47,869	$ (40,847)	$ (122)
Beginning balance, shares at Dec. 31, 2018				8,137,771
Beginning balance at Dec. 31, 2018		$ 109,206
Beginning balance, shares at Dec. 31, 2018		12,000
Net income (loss)	(5,242)					(5,242)
Accretion of the redeemable series A-1 preferred stock to redeemable value	(4,534)				(4,534)
Accretion of the redeemable series A-1 preferred stock to redeemable shares		$ 4,534
Stock-based compensation	1,228				1,228
Common stock issued	6				6
Common stock issued, shares				1,775
Ending balance at Mar. 31, 2019	(1,642)				44,569	(46,089)	(122)
Ending balance, shares at Mar. 31, 2019				8,139,546
Ending balance at Mar. 31, 2019		$ 113,740
Ending balance, shares at Mar. 31, 2019		12,000
Beginning balance at Dec. 31, 2018	6,900				47,869	(40,847)	(122)
Beginning balance, shares at Dec. 31, 2018				8,137,771
Beginning balance at Dec. 31, 2018		$ 109,206
Beginning balance, shares at Dec. 31, 2018		12,000
Net income (loss)	(12,247)
Accumulated other comprehensive income (loss)	3
Ending balance at Sep. 30, 2019	(11,922)				41,291	(53,094)	(122)	$ 3
Ending balance, shares at Sep. 30, 2019				8,310,885
Ending balance at Sep. 30, 2019		$ 123,547
Ending balance, shares at Sep. 30, 2019		12,000
Beginning balance at Mar. 31, 2019	(1,642)				44,569	(46,089)	(122)
Beginning balance, shares at Mar. 31, 2019				8,139,546
Beginning balance at Mar. 31, 2019		$ 113,740
Beginning balance, shares at Mar. 31, 2019		12,000
Net income (loss)	(322)					(322)
Accretion of the redeemable series A-1 preferred stock to redeemable value	(4,777)				(4,777)
Accretion of the redeemable series A-1 preferred stock to redeemable shares		$ 4,777
Stock-based compensation	1,294				1,294
Common stock issued	3,452				3,452
Common stock issued, shares				138,781
Accumulated other comprehensive income (loss)	23							23
Ending balance at Jun. 30, 2019	(1,972)				44,538	(46,411)	(122)	23
Ending balance, shares at Jun. 30, 2019				8,278,327
Ending balance at Jun. 30, 2019		$ 118,517
Ending balance, shares at Jun. 30, 2019		12,000
Net income (loss)	(6,683)					(6,683)
Accretion of the redeemable series A-1 preferred stock to redeemable value	(5,030)				(5,030)
Accretion of the redeemable series A-1 preferred stock to redeemable shares		$ 5,030
Stock-based compensation	1,055				1,055
Common stock issued	728				728
Common stock issued, shares				32,558
Accumulated other comprehensive income (loss)	(20)							(20)
Ending balance at Sep. 30, 2019	(11,922)				41,291	(53,094)	$ (122)	3
Ending balance, shares at Sep. 30, 2019				8,310,885
Ending balance at Sep. 30, 2019		$ 123,547
Ending balance, shares at Sep. 30, 2019		12,000
Beginning balance at Dec. 31, 2019	(26,291)				38,153	(64,404)		(40)
Beginning balance, shares at Dec. 31, 2019				8,370,107
Beginning balance at Dec. 31, 2019		$ 128,822
Beginning balance, shares at Dec. 31, 2019		12,000	0
Net income (loss)	(41,248)					(41,248)
Accretion of the redeemable series A-1 preferred stock to redeemable value	(5,415)				(5,415)
Accretion of the redeemable series A-1 preferred stock to redeemable shares		$ 5,415
Stock-based compensation	1,150				1,150
Accumulated other comprehensive income (loss)	37							37
Ending balance at Mar. 31, 2020	(71,767)				33,888	(105,652)		(3)
Ending balance, shares at Mar. 31, 2020				8,370,107
Ending balance at Mar. 31, 2020		$ 134,237
Ending balance, shares at Mar. 31, 2020		12,000
Beginning balance at Dec. 31, 2019	(26,291)				38,153	(64,404)		(40)
Beginning balance, shares at Dec. 31, 2019				8,370,107
Beginning balance at Dec. 31, 2019		$ 128,822
Beginning balance, shares at Dec. 31, 2019		12,000	0
Net income (loss)	$ (58,761)
Redemption of the series A-1, shares	1,786,739
Dividend payment to the series A-2 preferred shareholders			$ (2,900)
Cancellation of shares	(117,785)
Accumulated other comprehensive income (loss)	$ 27
Ending balance at Sep. 30, 2020	138,767				261,945	(123,165)		(13)
Ending balance, shares at Sep. 30, 2020				24,893,122
Ending balance at Sep. 30, 2020			$ 152,928
Ending balance, shares at Sep. 30, 2020		0	17,500
Beginning balance at Mar. 31, 2020	(71,767)				33,888	(105,652)		(3)
Beginning balance, shares at Mar. 31, 2020				8,370,107
Beginning balance at Mar. 31, 2020		$ 134,237
Beginning balance, shares at Mar. 31, 2020		12,000
Net income (loss)	13,224					13,224
Accretion of the redeemable series A-1 preferred stock to redeemable value	(5,644)				(5,644)
Accretion of the redeemable series A-1 preferred stock to redeemable shares		$ 5,644
Issuance of the convertible and redeemable series A-2 preferred stock			$ 152,928
Issuance of the convertible and redeemable series A-2 preferred stock, shares			17,500
Stock-based compensation	1,140				1,140
Common stock issued	25,021				25,021
Common stock issued, shares				794,639
Accumulated other comprehensive income (loss)	(90)							(90)
Ending balance at Jun. 30, 2020	(38,116)				54,405	(92,428)		(93)
Ending balance, shares at Jun. 30, 2020				9,164,746
Ending balance at Jun. 30, 2020		$ 139,881	$ 152,928
Ending balance, shares at Jun. 30, 2020		12,000	17,500
Net income (loss)	(30,737)					(30,737)
Accretion of the redeemable series A-1 preferred stock to redeemable value	6,542				(6,542)
Accretion of the redeemable series A-1 preferred stock to redeemable shares		$ 6,542
Series A-1 preferred stock deemed dividend	(24,341)				(24,341)
Series A-1 preferred stock deemed dividend		$ 24,341
Redemption of the series A-1	$ 26,801				26,801
Temporary equity redemption of the series A-1, shares		(12,000)
Temporary equity redemption of the series A-1, value		$ (170,764)
Redemption of the series A-1, shares	1,786,739			1,786,739
Dividend payment to the series A-2 preferred shareholders	$ (2,870)		$ (2,900)		(2,870)
Exercise of the series A-1 preferred stock warrant	11,871				11,871
Exercise of the series A-1 preferred stock warrant, shares				534,240
Exercise of the series A-2 preferred stock warrant	44,441				44,441
Exercise of the series A-2 preferred stock warrant,shares				1,999,999
Stock-based compensation	1,149				1,149
Common stock issued	150				150
Common stock issued, shares				26,850
Issuance of common stock in connection with initial public offering, net of issuance costs of $15.6 million	$ 156,881				156,881
Issuance of common stock in connection with initial public offering, net of issuance costs of $15.6 million, shares				11,500,000
Cancellation of shares	(117,785)			(119,452)
Accumulated other comprehensive income (loss)	$ 80							80
Ending balance at Sep. 30, 2020	$ 138,767				$ 261,945	$ (123,165)		$ (13)
Ending balance, shares at Sep. 30, 2020				24,893,122
Ending balance at Sep. 30, 2020			$ 152,928
Ending balance, shares at Sep. 30, 2020		0	17,500

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UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF REDEEMABLE SERIES A-1 PREFERRED STOCK, CONVERTIBLE AND REDEEMABLE SERIES A-2 PREFERRED STOCK AND STOCKHOLDERS' EQUITY (DEFICIT) (Parenthetical) $ in Millions	3 Months Ended
	Sep. 30, 2020 USD ($)
Statement Of Stockholders Equity [Abstract]
Issuance of common stock in connection with initial public offering, issuance costs	$ 15.6

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UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	3 Months Ended			9 Months Ended		12 Months Ended
	Sep. 30, 2020	Mar. 31, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
OPERATING ACTIVITIES:
Net loss	$ (30,737)		$ (6,683)	$ (58,761)	$ (12,247)
Adjustments to reconcile net loss to net cash (used in) provided by operating activities:
Provision for bad debt		$ 6,300		6,445	590	$ 1,246
Depreciation and amortization	9,740		7,412	27,084	20,262
Stock-based compensation expense	1,149		1,055	3,439	3,577
Fair value changes in the contingent put option	(26,265)			(19,240)
Fair value changes in the compound embedded option	26,664			27,420
Fair value changes in business acquisitions contingent consideration	13,404		256	17,387	(670)
Fair value changes in the warrant options	9,311		2,510	9,312	4,059
Deferred income taxes				(1,563)	(1,308)
Cloud computing costs				(2,350)	(247)
Other				1,170	97
Changes in operating assets and liabilities—net of acquisitions:
Accounts receivable and contract assets				(7,736)	(2,732)
Prepaid expenses and other current assets				(1,349)	(179)
Accounts payable and other accrued liabilities				(4,829)	(95)
Accrued payroll and benefits				6,084	1,440
Payment of contingent consideration and other assumed purchase price obligations				(6,390)
Net cash (used in) provided by operating activities				(3,877)	12,547
INVESTING ACTIVITIES:
Purchases of property and equipment				(5,366)	(2,765)
Proprietary software development				(370)	(6)
Proceeds from net working capital adjustment related to acquisitions				2,819
Cash paid for acquisitions—net of cash acquired				(173,923)	(81,370)
Net cash used in investing activities				(176,840)	(84,141)
FINANCING ACTIVITIES:
Proceeds from line of credit				104,390	149,744
Payments on line of credit				(201,980)	(69,744)
Proceeds from term loans				175,000
Repayment of term loan				(49,297)
Payment of contingent consideration and other purchase price obligations				(6,004)	(1,136)
Repayment of capital leases				(2,257)	(1,304)
Proceeds from issuance of common stock in connection with initial public offering, net of issuance costs				161,288
Payments of deferred offering costs				(2,925)	(29)
Debt issuance costs				(4,866)	(417)
Debt extinguishment costs				(351)
Proceeds from issuance of common stock				171	139
Issuance of convertible and redeemable Series A-2 preferred stock and warrant				173,664
Redemption of the Series A-1 Preferred Stock				(131,821)
Dividend payment to the Series A-2 shareholders				(2,870)
Exercise of warrant options				25
Net cash provided by financing activities				212,167	77,253
CHANGE IN CASH, CASH EQUIVALENTS AND RESTRICTED CASH				31,450	5,659
Foreign exchange impact on cash balance				43	(5)
Beginning of year		$ 6,884		6,884	2,489	2,489
End of period	$ 38,377		$ 8,143	38,377	8,143	$ 6,884
SUPPLEMENTAL DISCLOSURES OF CASH FLOWS INFORMATION:
Cash paid for interest				9,368	2,689
Cash paid for income tax				171	878
SUPPLEMENTAL DISCLOSURES OF NON-CASH INVESTING AND FINANCING ACTIVITIES:
Series A-1 preferred stock deemed dividend—net of return from holders				24,341
Series A-1 preferred stock dividend paid in common shares				26,801
Accrued purchases of property and equipment				486	932
Property and equipment acquired under capital leases				1,753	2,757
Accretion of the redeemable series A-1 preferred stock to redeemable value				17,601	14,341
Common stock issued to acquire new businesses				25,000	4,047
Acquisitions unpaid contingent consideration				58,912	$ 5,401
Offering costs included in accounts payable and other accrued liabilities				$ 1,237

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Description of the Business and Basis of Presentation

9 Months Ended

Sep. 30, 2020

Organization Consolidation And Presentation Of Financial Statements [Abstract]

Description of the Business and Basis of Presentation

1. DESCRIPTION OF THE BUSINESS AND BASIS OF PRESENTATION

Description of the Business—Montrose Environmental Group, Inc. (“Montrose” or the “Company”) is a corporation formed on November 2013, under the laws of the State of Delaware. The Company has approximately 70 offices across the United States, Canada and Australia and over 1,700 employees. Montrose is highly acquisitive and, as of September 30, 2020, had completed 56 acquisitions since its inception.

Montrose is an environmental services company serving the recurring environmental needs of a diverse client base, including Fortune 500 companies and federal, state and local governments through the following three segments:

Assessment, Permitting and Response—Through its Assessment, Permitting and Response segment, Montrose provides scientific advisory and consulting services to support environmental assessments, environmental emergency response, and environmental audits and permits for current operations, facility upgrades, new projects, decommissioning projects and development projects. Montrose’s technical advisory and consulting offerings include regulatory compliance support and planning, environmental, ecosystem and toxicological assessments and support during responses to environmental disruption. Montrose helps clients navigate regulations at the local, state, provincial and federal levels.

Measurement and Analysis—Through its Measurement and Analysis segment, Montrose’s teams test and analyze air, water and soil to determine concentrations of contaminants as well as the toxicological impact of contaminants on flora, fauna and human health. Montrose’s offerings include source and ambient air testing and monitoring, leak detection and repair (“LDAR”) and advanced analytical laboratory services such as air, storm water, wastewater and drinking water analysis.

Remediation and Reuse—Through its Remediation and Reuse segment, Montrose provides clients with engineering, design, implementation and operations and maintenance (“O&M”) services, primarily to treat contaminated water, remove contaminants from soil or create biogas from waste. The Company does not own the properties or facilities at which it implements these projects or the underlying liabilities, nor does it own material amounts of the equipment used in projects; instead, the Company assists clients in designing solutions, managing projects and mitigating their environmental risks and liabilities at their locations.

Initial Public Offering—On July 27, 2020, the Company completed its initial public offering (“IPO”) of common stock, in which it sold 11,500,000 shares, including 1,500,000 shares issued pursuant to the underwriters full exercise on July 24, 2020 of the underwriters’ option to purchase additional shares, at a price to the public of $15.00 per share, resulting in net proceeds to the Company of approximately $161.3 million after deducting underwriting discounts of $11.2 million. Additionally, the Company offset $4.4 million of deferred IPO costs against IPO proceeds recorded to additional paid in capital. These deferred IPO costs were directly attributable to the IPO offering in accordance with Staff Accounting Bulletin Topic 5: Miscellaneous Accounting. The Company’s common stock began trading on the New York Stock Exchange on July 23, 2020.

Basis of Presentation—The unaudited condensed consolidated financial statements include the operations of the Company and its wholly-owned subsidiaries. These unaudited condensed consolidated financial statements are presented in conformity with accounting principles generally accepted in the United States (“U.S. GAAP”) and have been prepared pursuant to the rules and regulations of the U.S. Securities and Exchange Commission (“SEC”) that permit reduced disclosure for interim periods. The unaudited condensed consolidated financial statements include all accounts of the Company and, in the opinion of management, include all recurring adjustments and normal accruals necessary for a fair statement of the Company’s financial position, results of operations and cash flows for the dates and periods presented. These unaudited condensed consolidated financial statements should be read in conjunction with the Company’s audited financial statements as of and for the year ended December 31, 2019. Results for interim periods are not necessarily indicative of the results to be expected during the remainder of the current year or for any future period. All intercompany transactions, accounts and profits, have been eliminated in the condensed consolidated financial statements.

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Summary of New Accounting Pronouncements

9 Months Ended

Sep. 30, 2020

New Accounting Pronouncements And Changes In Accounting Principles [Abstract]

Summary of New Accounting Pronouncements

2. SUMMARY OF NEW ACCOUNTING PRONOUNCEMENTS

Recently Adopted Accounting Pronouncements— The Company qualifies as an emerging growth company as defined in the Jumpstart Our Business Startups Act of 2012 (“JOBS Act”) and therefore intends to take advantage of certain exemptions from various public company reporting requirements, including delaying adoption of new or revised accounting standards until those standards apply to private companies. The Company has elected to use this extended transition period under the JOBS Act. The effective dates shown below reflect the election to use the extended transition period.

In June 2018, the Financial Accounting Standards Board (“FASB”) issued Accounting Standard Update (“ASU”) 2018-07, Compensation—Stock Compensation: Improvements to Nonemployee Share-Based Payment Accounting. Under the revised guidance, the accounting for awards issued to non-employees will be similar to the accounting for employee awards. The new guidance is effective for fiscal years beginning after December 15, 2019. The standard was adopted as of January 1, 2020 and did not have a material impact on the Company’s condensed consolidated financial statements.

In January 2017, the FASB issued ASU 2017-04, Intangibles—Goodwill and Other (Topic 350): Simplifying the Accounting for Goodwill Impairment. The revised guidance eliminates Step 2 of the current goodwill impairment analysis test, which requires hypothetical purchase price allocation to measure goodwill impairment. A goodwill impairment loss will instead be measured at the amount by which a reporting unit’s carrying amount exceeds its fair value, not to exceed the carrying amount of goodwill. The revised guidance was adopted as of January 1, 2020 and did not have a material impact on the Company’s condensed consolidated financial statements.

Recently Issued Accounting Pronouncements Not Yet Adopted— In August 2020, the FASB issued ASU 2020-06, Debt—Debt with Conversion and Other Options (Subtopic 470-20) and Derivatives and Hedging—Contracts in Entity’s Own Equity (Subtopic 815-40)—Accounting for Convertible Instruments and Contracts in an Entity’s Own Equity. The ASU simplifies accounting for convertible instruments by removing major separation models required under current GAAP. Consequently, more convertible debt instruments will be reported as a single liability instrument with no separate accounting for embedded conversion features. The ASU removes certain settlement conditions that are required for equity contracts to qualify for the derivative scope exception, which will permit more equity contracts to qualify for the exception. The ASU also simplifies the diluted net income per share calculation in certain areas. The new guidance is effective for fiscal years beginning after December 15, 2023, including interim periods within those fiscal years, and early adoption is permitted. The Company is currently evaluating the impact of the adoption of the standard on the condensed consolidated financial statements.

In March 2020, the FASB issued ASU 2020-04, Reference Rate Reform (Topic 848): Facilitation of the Effects of Reference Rate Reform on Financial Reporting. ASU 2020-04 provides optional expedients and exceptions for applying GAAP to contracts, hedging relationships and other transactions affected by the expected transition away from reference rates that are expected to be discontinued, such as LIBOR. ASU 2020-04 was effective upon issuance. The Company may elect to apply the guidance prospectively through December 31, 2022. The Company is currently evaluating the impact of the adoption of the standard on the condensed consolidated financial statements.

In December 2019, the FASB issued ASU 2019-12, Income Taxes (Topic 740): Simplifying the Accounting for Income Taxes. ASU 2019-12 removes certain exceptions to the general principles in ASC 740 and clarifies and amends certain guidance to promote consistent application. ASU 2019-12 is effective for the Company’s annual and interim periods beginning on January 1, 2021, with early adoption permitted. Depending on the amendment, adoption may be applied on a retrospective, modified retrospective or prospective basis. The Company is currently evaluating the impact of the adoption of the standard on the condensed consolidated financial statements and does not anticipate the standard to have a significant impact.

In June 2016, the FASB issued ASU 2016-13, Financial Instruments—Credit Losses (Topic 326). The standard introduces a new model for recognizing credit losses on financial instruments based on an estimate of current expected credit losses and will apply to trade receivables. The new guidance will be effective for the Company’s annual and interim periods beginning after December 15, 2022. The Company is currently evaluating the impact of the adoption of the standard on the condensed consolidated financial statements and does not anticipate the standard to have a significant impact.

In February 2016, the FASB issued ASU 2016-2, Leases (Topic 842), to improve financial reporting regarding leasing transactions. The ASU primarily affects the accounting by the lessee in that it requires a lessee to recognize lease assets and liabilities, initially measured at the present value of the lease payments, on the balance sheets for those leases classified as operating leases under previous guidance. The new leasing standard is effective for the Company’s annual and interim periods beginning after December 15, 2021. The new leasing standard requires modified retrospective transition. The Company is currently evaluating the impact of the adoption of the updated standard on the condensed consolidated financial statements, but anticipates a material increase in assets and liabilities due to the recognition of the required right-of-use asset and corresponding liability for all significant lease obligations that are currently classified as operating leases.

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Revenues and Accounts Receivable

9 Months Ended

Sep. 30, 2020

Revenues And Accounts Receivable [Abstract]

Revenues and Accounts Receivable

3. REVENUES AND ACCOUNTS RECEIVABLE

The Company’s main revenue sources derive from the following revenue streams:

Assessment, Permitting and Response Revenues—Assessment, Permitting and Response revenues are generated from multidisciplinary environmental consulting services. The majority of the contracts are fixed-price or time and material based.

Measurement and Analysis Revenues—Measurement and Analysis revenues are generated from emissions sampling, testing and reporting services, leak detection services, ambient air monitoring services and laboratory testing services. The majority of the contracts are fixed-price or time-and-materials based.

Remediation and Reuse Revenues—Remediation and Reuse revenues are generated from O&M services (on biogas and water treatment facilities), as well as remediation, monitoring and environmental compliance services. Services on the majority of O&M contracts are provided under long-term fixed-fee contracts. The majority of the remediation, monitoring and environmental compliance contracts are fixed price or time-and-materials based.

Disaggregation of Revenue—The Company disaggregates revenue by its operating segments. The Company believes disaggregating revenue into these categories achieves the disclosure objectives to depict how the nature, amount, and uncertainty of revenue and cash flows are affected by economic factors. Disaggregated revenue disclosures are provided in Note 19.

Contract Balances—The Company presents contract balances for unbilled receivables (contract assets), as well as customer advances, deposits and deferred revenue (contract liabilities) within contract assets and accounts payable and accrued expenses, respectively, on the condensed consolidated statements of financial position. Amounts are generally billed at periodic intervals (e.g., weekly, bi-weekly or monthly) as work progresses in accordance with agreed-upon contractual terms. The Company utilizes the practical expedient to not adjust the promised amount of consideration for the effects of a significant financing component as the period between when the Company transfers services to a customer and when the customer pays for those services is one year or less. Amounts recorded as unbilled receivables are generally for services the Company is not entitled to bill based on the passage of time. Under certain contracts, billing occurs subsequent to revenue recognition, resulting in contract assets. The Company sometimes receives advances or deposits from customers before revenue is recognized, resulting in contract liabilities.

The following table presents the Company’s contract balances:

	September 30,		December 31,
	2020		2019
Contract assets	$	35,441	$	13,605
Contract liabilities		9,335		3,314

Contracts assets acquired through business acquisitions completed in the nine months ended September 30, 2020 and the twelve months ended December 31, 2019, amounted to $6.5 million and $0.7 million, respectively. Contract liabilities acquired through business acquisitions completed in the nine months ended September 30, 2020 and twelve months ended December 31, 2019, amounted to zero and $2.2 million. Revenue recognized during the three and nine months ended September 30, 2020, included in the contract liabilities balance at December 31, 2019 was $0.5 million and $2.1 million, respectively. The revenue recognized from the contract liabilities consisted of the Company satisfying performance obligations during the normal course of business.

The amount of revenue recognized from changes in the transaction price associated with performance obligations satisfied in prior periods during the three and nine months ended September 30, 2020 was not material.

Remaining Unsatisfied Performance Obligations—Remaining unsatisfied performance obligations represent the total dollar value of work to be performed on contracts awarded and in progress. The amount of remaining unsatisfied performance obligations increases with new contracts or additions to existing contracts and decreases as revenue is recognized on existing contracts. Contracts are included in the amount of remaining unsatisfied performance obligations when an enforceable agreement has been reached. As of September 30, 2020 and December 31, 2019, the estimated revenue expected to be recognized in the future related to performance obligations that are unsatisfied was approximately $25.2 million and $13.0 million, respectively. As of September 30, 2020, the Company expected to recognize approximately $24.0 million of this amount as revenue within the next year and $1.2 million the year after.

Accounts Receivable, Net—Accounts receivable, net as of September 30, 2020 and December 31, 2019 consisted of the following:

	September 30,			December 31,
	2020			2019
Accounts receivable, invoiced	$	52,372		$	46,643
Accounts receivable, other		929			611
Allowance for doubtful accounts		(8,516	)		(1,327	)
Accounts receivable—net	$	44,785		$	45,927

The Company extends non-interest-bearing trade credit to its customers in the ordinary course of business. Accounts receivable are shown on the face of the condensed consolidated statements of financial position, net of an allowance for doubtful accounts. In determining the allowance for doubtful accounts, the Company analyzes the aging of accounts receivable, historical bad debts, customer creditworthiness and current economic trends. Subsequent to December 31, 2019, there was a global outbreak of a new strain of coronavirus, COVID-19. The COVID-19 pandemic has added uncertainty to the collectability of certain receivables, particularly in industries hard hit by the pandemic. As a result, the Company recorded a $6.3 million bad debt reserve during the first quarter of 2020. The bad debt adjustment included a $5.5 million reserve for one customer in the Company’s Remediation and Reuse segment in which management concluded to discontinue select service lines as of March 31, 2020 (Note 19). For all periods presented, no customer accounted for more than 10.0% of revenue or accounts receivable, net.

The allowance for doubtful accounts as of September 30, 2020 and December 31, 2019 consisted of the following:

	Beginning Balance		Bad Debt Expense		Charged to Allowance			Other(1)		Ending Balance
Nine months ended September 30, 2020	$	1,327	$	6,445	$	(294	)	$	1,038	$	8,516
Year ended December 31, 2019		453		1,246		(556	)		184		1,327

(1) This amount consists of additions to the allowance due to business acquisitions.

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Prepaid and Other Current Assets

9 Months Ended

Sep. 30, 2020

Deferred Costs Capitalized Prepaid And Other Assets Disclosure [Abstract]

Prepaid and Other Current Assets

4. PREPAID AND OTHER CURRENT ASSETS

Prepaid and other current assets as of September 30, 2020 and December 31, 2019 consisted of the following:

	September 30,		December 31,
	2020		2019
Deposits	$	733	$	605
Prepaid expenses		1,665		1,235
Prepaid insurance		2,577		170
Supplies		2,428		2,368
Offering costs		—		1,240
Income tax receivable		1,182		1,205
Prepaid and other current assets	$	8,585	$	6,823

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Property and Equipment

9 Months Ended

Sep. 30, 2020

Property Plant And Equipment [Abstract]

Property and Equipment

5. PROPERTY AND EQUIPMENT

Property and equipment are stated at cost or estimated fair value for assets acquired through business combinations. Depreciation and amortization is provided using the straight-line method over the estimated useful lives of the assets. Leasehold improvements are amortized using the straight-line method over the shorter of the remaining lease term, including options that are deemed to be reasonably assured, or the estimated useful life of the improvement.

Property and equipment, net, as of September 30, 2020 and December 31, 2019 consisted of the following:

	Estimated	September 30,			December 31,
	Useful Life	2020			2019
Lab and test equipment	7 years	$	17,755		$	14,810
Vehicles	5 years		12,869			11,073
Equipment	3–7 years		31,539			29,922
Furniture and fixtures	7 years		2,854			1,119
Leasehold improvements	7 years		6,758			5,954
Aircraft	10 years		834			—
Building	39 years		2,975			—
			75,584			62,878
Land			725			—
Construction in progress			156			796
Less accumulated depreciation			(41,906	)		(36,638	)
Total property and equipment—net		$	34,559		$	27,036

Total depreciation expense included on the condensed consolidated statements of operations was $2.1 million and $6.1 million for the three and nine months ended September 30, 2020, respectively. Total depreciation expense included on the condensed consolidated statements of operations was $2.1 million and $5.9 million for the three and nine months ended September 30, 2019, respectively.

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Business Acquisitions

9 Months Ended

Sep. 30, 2020

Business Combinations [Abstract]

Business Acquisitions

6. BUSINESS ACQUISITIONS

In line with the Company’s strategic growth initiatives, the Company acquired several businesses during the nine months ended September 30, 2020 and September 30, 2019. The results of each of those acquired businesses are included in the condensed consolidated financial statements beginning on the respective acquisition dates. Each transaction qualified as an acquisition of a business and was accounted for as a business combination. All acquisitions resulted in the recognition of goodwill. The Company paid these premiums resulting in such goodwill for a number of reasons, including expected synergies from combining operations of the acquiree and the Company while also growing the Company’s customer base, acquiring assembled workforces, expanding its presence in certain markets and expanding and advancing its product and service offerings. The Company recorded the assets acquired and liabilities assumed at their acquisition date fair value, with the difference between the fair value of the net assets acquired and the acquisition consideration reflected as goodwill.

The identifiable intangible assets for acquisitions are valued using the excess earnings method discounted cash flow approach for customer relationships, the relief from royalty method for trade names, the patent and external proprietary software, the “with and without” method for covenants not to compete and the replacement cost method for the internal proprietary software by incorporating Level 3 inputs as described under the fair value hierarchy of ASC 820. These unobservable inputs reflect the Company’s own assumptions about which assumptions market participants would use in pricing an asset on a non-recurring basis. These assets will be amortized over their respective estimated useful lives.

Other purchase price obligations (primarily deferred purchase price liabilities and target working capital liabilities or receivables) are included on the condensed consolidated statements of financial position in accounts payable and other accrued liabilities, other non-current liabilities or accounts receivable-net in the case of working capital deficits. Contingent consideration outstanding from acquisitions are included on the condensed consolidated statements of financial position in business acquisition contingent consideration, current or in business acquisitions contingent consideration, long-term. These obligations are scheduled to be settled if certain performance thresholds are met.

The Company considers several factors when determining whether or not contingent consideration liabilities are part of the purchase price, including the following: (i) the valuation of its acquisitions is not supported solely by the initial consideration paid, (ii) the former stockholders of acquired companies that remain as key employees receive compensation other than contingent consideration payments at a reasonable level compared with the compensation of the Company’s other key employees and (iii) contingent consideration payments are not affected by employment termination. The Company reviews and assesses the estimated fair value of contingent consideration at each reporting period.

Transaction costs related to business combinations totaled $3.8 million and $2.4 million for the nine months ended September 30, 2020 and September 30, 2019, respectively, and zero and $1.3 million for the three months ended September 30, 2020 and September 30, 2019, respectively. These costs are expensed within the selling, general and administrative expense in the accompanying condensed consolidated statements of operations.

The cash payment made to acquire The Center for Toxicology and Environmental Health, L.L.C. (“CTEH”) was funded through the issuance of the Convertible and Redeemable Series A-2 Preferred Stock (Note 16) and the common stock portion of the purchase price was funded through the issuance of 791,139 shares of common stock. Cash payments made to acquire businesses during the nine months ended September 30, 2019 were funded through the Company’s prior senior secured credit facility (Note 12).

Acquisitions completed during the nine months ended September 30, 2020

The Center for Toxicology and Environmental Health, L.L.C.—In April 2020, the Company completed the acquisition of CTEH by acquiring 100% of its membership interests. CTEH is an environmental consulting company headquartered in Arkansas that specializes in environmental response and toxicology. The transaction qualified as an acquisition of a business and is accounted for as a business combination.

Leed Environmental Inc.— In September 2020, the Company acquired certain testing assets, and operations from Leed Environmental Inc. (“LEED”). LEED provides environmental project management and coordination services. LEED expands the Company’s remediation capabilities in the Northeast region of the United States.

American Environmental Testing Co.— In September 2020, the Company acquired certain assets and operations of American Environmental Testing Co. (“AETC”), a stack testing company in Utah. AETC expands the Company’s air measurement and analysis capabilities in the West Coast region.

The following table summarizes the elements of purchase price of the acquisitions completed during the nine months ended September 30, 2020:

	Cash		Common Stock		Other Purchase Price Component Current			Other Purchase Price Component Long Term		Contingent Consideration Current		Contingent Consideration Long Term		Total Purchase Price
CTEH	$	175,000	$	25,000	$	(2,297	)	$	—	$	34,451	$	10,543	$	242,697
All other acquisitions		450		—		50			100		210		—		810
	$	175,450	$	25,000	$	(2,247	)	$	100	$	34,661	$	10,543	$	243,507

The contingent consideration elements of the purchase price of the acquisitions is related to earn-outs which are based on the expected achievement of revenue or earnings thresholds as of the date of the acquisition and for which the maximum potential amount is limited.

CTEH first year earnout is to be calculated at twelve times CTEH’s 2020 EBITDA (as defined in the purchase agreement) in excess of $18.3 million, with a maximum first year earn-out payment of $50.0 million. The second year earn-out is to be calculated at ten times CTEH’s 2021 EBITDA in excess of actual 2020 EBITDA (with actual 2020 EBITDA subject to a minimum of $18.3 million and a maximum of $22.5 million), with a maximum second year earn-out payment of $30.0 million. The 2020 earn out was initially payable 100% in common stock, but as a result of the completion of the Company’s IPO (Note 1), 50% of any 2020 earnout payment will be payable in cash and 50% will be payable, at the Company’s election, in cash or shares of common stock. The 2021 earn out, if any, is payable 100% in cash.

The preliminary purchase price attributable to the acquisitions was allocated as follows:

	CTEH		All Other Acquisitions		Total
Cash	$	1,527	$	—	$	1,527
Accounts receivable		17,059		—		17,059
Other current assets		1,265		—		1,265
Current assets		19,851		—		19,851
Property and equipment		7,042		75		7,117
Customer relationships		56,000		—		56,000
Trade names		4,200		—		4,200
Covenants not to compete		4,000		109		4,109
Proprietary software		14,700		—		14,700
Goodwill		146,625		626		147,251
Total assets		252,418		810		253,228
Current liabilities		9,721		—		9,721
Total liabilities		9,721		—		9,721
Purchase price	$	242,697	$	810	$	243,507

For the acquisitions completed during the nine months ended September 30, 2020, the results of operations have been combined with those of the Company. The Company’s condensed consolidated statement of operations for the three and nine months ended September 30, 2020 includes revenue and pre-tax income of $37.2 million and $5.7 million, respectively, related mainly to the CTEH acquisition. CTEH, LEED and AETC are included in the Company’s Assessment, Permitting and Response, Remediation and Reuse and Measurement and Analysis segments, respectively.

The weighted average useful lives for the acquired customer relationships and internal proprietary software for the CTEH acquisition are 15 years and 3 years, respectively. The weighted average useful lives for the acquired tradenames, covenants not to compete and external proprietary software for the CTEH acquisition is 5 years. The weighted average useful lives for the acquired covenants not to compete for the other acquisitions is 4 years.

Goodwill associated with the CTEH, LEED and AETC acquisitions is deductible for income tax purposes.

Acquisitions completed during the nine months ended September 30, 2019

Golden Specialty, Inc.—In March 2019, the Company acquired 100% of the issued and outstanding capital stock of Golden Specialty, Inc. (“Golden”), an air testing laboratory in Texas. Golden expands the Company’s air measurement and analysis capabilities in the Gulf Coast region.

Target Emission Services Inc.—In April 2019, the Company acquired 100% of the issued and outstanding capital stock of Target Emission Services, Inc. (“TES”), an emission detection company in Canada. TES expands the Company’s LDAR business, increasing the geographic footprint in Canada and initiating growth into international markets.

Target Emission Services USA LP—In April 2019, the Company acquired 100% of the issued and outstanding capital stock of Target Emission Services USA LP (now Target Emission Services USA LLC) (“TESUS”), an emission detection company in the United States. TESUS expands the Company’s LDAR business throughout the United States.

Air Water & Soil Laboratories, Inc.—In June 2019, the Company acquired 100% of the issued and outstanding capital stock of Air Water & Soil Laboratories, Inc. (“AWS”), a provider of air, water, and soil testing in the mid-Atlantic region. AWS expands the Company’s air, water, and soil environmental lab services in the East Coast region.

Advanced Environmental Compliance LLC—In July 2019, the Company acquired certain emissions testing assets, employees and customer relationships from Advanced Environmental Compliance LLC (“AEC”). AEC is in the business of providing air quality measurement and analysis services, together with environmental laboratory services. AEC expands the Company’s emissions testing services offering in the West Coast region.

LEHDER Environmental Services Ltd.—In July 2019, the Company acquired 100% of the issued and outstanding capital stock of LEHDER Environmental Services (“LEHDER”), a provider of air quality management services in Canada. LEHDER expands the Company’s international reach and air quality services capabilities in Canada.

Emerging Compounds Treatments Technologies, Inc.—In August 2019, the Company acquired 100% of the issued and outstanding capital stock of Emerging Compounds Treatments Technologies, Inc. (“ECT2”), a provider of novel technologies for removing contaminants/compounds from water and air. ECT2 expands the Company’s water and air treatment capabilities throughout the United States and Australia.

The following table summarizes the elements of purchase price of the acquisitions completed during the nine months ended September 30, 2019:

	Cash		Common Stock		Other Purchase Price Components			Contingent Consideration		Total Purchase Price
Golden	$	1,500		—		—		$	477	$	1,977
TES		2,359		322		25			4,911		7,617
TESUS		18,683		3,041		1,495			—		23,219
AWS		6,020		—		150			—		6,170
AEC		808		—		—			—		808
LEHDER		3,878		684		—			13		4,575
ECT2		54,037		—		(220	)		—		53,817
	$	87,285	$	4,047	$	1,450		$	5,401	$	98,183

Contingent consideration elements of the purchase price of these acquisitions are related to earn-outs which are based on the expected achievement of revenue or earnings thresholds by the applicable business as of the date of the acquisition and for which the maximum potential amount to be earned is generally not limited.

The purchase price attributable to the acquisitions was allocated as follows:

	ECT2		All Other Acquisitions		Total
Cash	$	3,149	$	2,137	$	5,286
Restricted cash		629		—		629
Accounts receivable		1,707		3,751		5,458
Other current assets		498		61		559
Current assets		5,983		5,949		11,932
Property and equipment		776		3,288		4,064
Customer relationships		13,840		12,748		26,588
Trade names		1,008		659		1,667
Covenants not to compete		3,360		2,083		5,443
Proprietary software		—		2,560		2,560
Patent		17,479		—		17,479
Goodwill		16,395		20,227		36,622
Total assets		58,841		47,514		106,355
Current liabilities		5,024		977		6,001
Non- current liabilities		—		2,171		2,171
Total liabilities		5,024		3,148		8,172
Purchase price	$	53,817	$	44,366	$	98,183

The weighted average useful lives for the acquired customer relationships, trade names, covenants not to compete, proprietary software and patent for these acquisitions are 9.5 years, 1.5 years, 4 years, 3 years and 16 years, respectively.

For the acquisitions completed during the nine months ended September 30, 2019, the results of operations since the acquisition dates have been combined with those of the Company. The Company’s three and nine months ended September 30, 2019 condensed consolidated statement of operations includes revenue of $7.7 million and pre-tax income of $1.5 million, respectively, related to these acquisitions. The Golden, TES, TESUS, AWS, AEC and LEHDER acquisitions are included in the Company’s Measurement and Analysis segment. The ECT2 acquisition is included in the Company’s Remediation and Reuse segment.

Goodwill associated with the acquisitions of Golden, AEC and ECT2 is deductible for income tax purposes.

Supplemental Unaudited Pro-Forma—The unaudited condensed consolidated financial information summarized in the following table gives effect to the 2020 and the 2019 acquisitions discussed above assuming they occurred on January 1, 2019. These unaudited consolidated pro forma operating results do not assume any impact from revenue, cost or other operating synergies that are expected or may have been realized as a result of the acquisitions. These unaudited consolidated pro forma operating results are presented for illustrative purposes only and are not indicative of the operating results that would have been achieved had the acquisitions occurred on January 1, 2019, nor does the information purport to reflect results for any future period.

	For the Three Months Ended September 30,
	2020								2019
	As reported			Acquisitions Pro-Forma (Unaudited)		Consolidated Pro-Forma (Unaudited)			As reported			Acquisitions Pro-Forma (Unaudited)		Consolidated Pro-Forma (Unaudited)
Revenues	$	84,705		$	—	$	84,705		$	57,623		$	18,551	$	76,174
Net (loss) income		(30,737	)		—		(30,737	)		(6,683	)		4,042		(2,641	)

	For the Nine Months Ended September 30,
	2020								2019
	As reported			Acquisitions Pro-Forma (Unaudited)		Consolidated Pro-Forma (Unaudited)			As reported			Acquisitions Pro-Forma (Unaudited)		Consolidated Pro-Forma (Unaudited)
Revenues	$	219,502		$	31,253	$	250,755		$	165,978		$	107,459	$	273,437
Net (loss) income		(58,761	)		10,288		(48,473	)		(12,247	)		30,002		17,755

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Goodwill and Intangible Assets

9 Months Ended

Sep. 30, 2020

Goodwill And Intangible Assets Disclosure [Abstract]

Goodwill and Intangible Assets

7. GOODWILL AND INTANGIBLE ASSETS

Amounts related to goodwill as of September 30, 2020 and December 31, 2019 are as follows:

	Assessment, Permitting and Response		Measurement and Analysis		Remediation and Reuse		Total
Balance as of December 31, 2019	$	15,173	$	68,628	$	43,257	$	127,058
Goodwill acquired during the period		146,625		426		200		147,251
Balance as of September 30, 2020	$	161,798	$	69,054	$	43,457	$	274,309

Amounts related to finite-lived intangible assets as of September 30, 2020 and December 31, 2019 are as follows:

September 30, 2020	Estimated Useful Life	Gross Balance		Accumulated Amortization		Total Intangible Assets—Net
Finite lived intangible assets
Customer relationships	7–15 years	$	164,782	$	49,068	$	115,714
Covenants not to compete	4–5 years		29,942		20,444		9,498
Trade names	1–5 years		16,938		12,196		4,742
Proprietary software	3-5 years		20,808		4,915		15,893
Patent	16 years		17,479		1,125		16,354
Total other intangible assets—net		$	249,949	$	87,748	$	162,201

December 31, 2019	Estimated Useful Life	Gross Balance		Accumulated Amortization		Total Intangible Assets—Net
Finite lived intangible assets
Customer relationships	7–10 years	$	108,782	$	36,700	$	72,082
Covenants not to compete	4–5 years		25,832		17,572		8,260
Trade names	1–5 years		12,738		10,230		2,508
Proprietary software	3 years		3,885		1,359		2,526
Patent	16 years		17,479		306		17,173
Total other intangible assets—net		$	168,716	$	66,167	$	102,549

Intangible assets with finite lives are stated at cost, less accumulated amortization and impairment losses, if any. These intangible assets are amortized using the straight-line method over the estimated useful lives of the assets.

Amortization expense was $7.6 million and $21.0 million for the three and nine months ended September 30, 2020, respectively and $5.3 million and $14.4 million for the three and nine months ended September 30, 2019, respectively.

Future amortization expense is estimated to be as follows for each of the five following years and thereafter:

December 31,
2020 (remaining)	$	7,543
2021		28,140
2022		24,053
2023		20,073
2024		16,951
Thereafter		65,441
	$	162,201

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Accounts Payable and Other Accrued Liabilities

9 Months Ended

Sep. 30, 2020

Payables And Accruals [Abstract]

Accounts Payable and Other Accrued Liabilities

8. ACCOUNTS PAYABLE AND OTHER ACCRUED LIABILITIES

Accounts payable and other accrued liabilities consisted of the following as of September 30, 2020 and December 31, 2019:

	September 30,		December 31,
	2020		2019
Accounts payable	$	13,360	$	15,034
Accrued expenses		10,395		10,733
Other purchase obligations		572		—
Contract liabilities		9,335		3,314
Other current liabilities		235		504
Total accounts payable and other accrued liabilities	$	33,897	$	29,585

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Accrued Payroll and Benefits

9 Months Ended

Sep. 30, 2020

Statement Of Financial Position [Abstract]

Accrued Payroll and Benefits

9. ACCRUED PAYROLL AND BENEFITS

Accrued payroll and benefits consisted of the following as of September 30, 2020 and December 31, 2019:

	September 30,		December 31,
	2020		2019
Accrued bonuses	$	7,854	$	3,449
Accrued paid time off		2,157		2,154
Accrued payroll		5,536		4,470
Accrued other		2,410		959
Total accrued payroll and benefits	$	17,957	$	11,032

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Income Taxes

9 Months Ended

Sep. 30, 2020

Income Tax Disclosure [Abstract]

Income Taxes

10. INCOME TAXES

The Company calculates its interim income tax provision in accordance with Accounting Standard Codification Topic 270, Interim Reporting (“ASC 270”), and ASC 740. The Company’s effective tax rate (“ETR”) from continuing operations was (12.2%) and 5.8% for the three months ended September 30, 2020 and September 30, 2019, respectively, and 2.6% and 9.6% for the nine months ended September 30, 2020 and September 30, 2019, respectively, and the Company recorded income tax expense/(benefit) of $3.3 million and $(0.4) million for the three months ended September 30, 2020 and September 30, 2019, respectively, and income tax benefits of $1.6 million and $1.3 million for the nine months ended September 30, 2020 and September 30, 2019, respectively. The difference between the ETR and federal statutory rate of 21.0% is primarily attributable to items recorded for GAAP but permanently disallowed for U.S. federal income tax purposes, recognition of a US federal and state valuation allowance, state and foreign income tax provisions and Global Intangible Low Taxed Income (“GILTI”).

A valuation allowance is recorded when it is more-likely-than-not some of the Company’s deferred tax assets may not be realized. Significant judgment is applied when assessing the need for a valuation allowance and the Company considers future taxable income, reversals of existing deferred tax assets and liabilities and ongoing prudent and feasible tax planning strategies, in making such assessment. As of September 30, 2020, the Company determined its US federal and state net deferred tax assets are not more-likely-than-not to be realized and recorded a valuation allowance of $7.4 million against the net deferred tax assets.

The Company records uncertain tax positions in accordance with ASC 740, Income Taxes, on the basis of a two-step process in which (i) the Company determines whether it is more likely than not a tax position will be sustained on the basis of the technical merits of such position and (ii) for those tax positions meeting the more-likely-than-not recognition threshold, the Company would recognize the largest amount of tax benefit that is more than 50.0% likely to be realized upon ultimate settlement with the related tax authority. The Company has determined it has no uncertain tax positions as of September 30, 2020. The Company classifies interest and penalties recognized on uncertain tax positions as a component of income tax expense.

On March 27, 2020, the Coronavirus Aid, Relief, and Economic Security Act (“CARES Act”) was enacted. The CARES Act includes several significant provisions for corporations, including those pertaining to net operating losses, interest deductions and payroll tax benefits. Under ASC 740, the effects of new legislation are recognized upon enactment. Accordingly, the effects of the CARES Act have been incorporated into the income tax provision computation for the nine months ended September 30, 2020. These provisions did not have a material impact on the income tax provision. The Company anticipates deferring the employer side social security payments for payroll paid for the remainder of 2020 as permitted by the CARES Act.

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Warrant Options

9 Months Ended

Sep. 30, 2020

Warrants And Rights Note Disclosure [Abstract]

Warrant Options

11. WARRANT OPTIONS

In October 2018, in connection with the issuance of the Redeemable Series A-1 Preferred Stock, the Company issued a detachable warrant to acquire 534,240 shares of common stock at a price of $0.01 per share at any given time during a period of ten years beginning on the instrument’s issuance date.

On July 30, 2020, the Redeemable Series A-1 Preferred Stock warrant was exercised in full resulting in the issuance of 534,240 shares of common stock to the holder, for an exercise price of $0.01 per share. The fair value of this warrant was determined to be $11.9 million and $16.9 million immediately before the exercise of the warrant option and as of December 31, 2019, respectively. Fair value gains/(losses) recorded in other expense on the condensed consolidated statements of operations were $5.0 million for the three and nine months ended September 30, 2020 and $(2.5) million and $(4.1) million for the three and nine months ended September 30, 2019, respectively.

In April 2020, in connection with the issuance of the Convertible and Redeemable Series A-2 Preferred Stock, the Company issued a detachable warrant to acquire 1,351,960 shares of common stock at a price of $0.01 per share at any time following the occurrence of a qualifying IPO, a sale of the Company, or a redemption in full of the Series A-2 preferred stock (each, an “Adjustment Event”), with an expiration date of ten years from the instrument’s issuance date. The number of shares underlying the warrant and issuable upon exercise was subject to adjustment based upon the price per share of common stock upon the occurrence of an Adjustment Event (Note 16) to reflect an aggregate value of $30.0 million.

As a result of the $15.00 per share public offering price in the IPO, the warrant issued in connection with the issuance of the Convertible and Redeemable Series A-2 Preferred Stock was adjusted pursuant to its terms and, upon closing of the IPO, represented a warrant to purchase 1,999,999 shares of common stock (an increase of 648,039 shares).

On July 30, 2020, the Convertible and Redeemable Series A-2 Preferred Stock warrant was exercised in full resulting in the issuance of 1,999,999 shares of common stock to the holder, for an exercise price of $0.01 per share. The fair value of this warrant was determined to be $44.4 million immediately before the exercise of the warrant option. Fair value loss recorded in other expense on the condensed consolidated statements of operations was $14.3 million for the three and nine months ended September 30, 2020.

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Debt

9 Months Ended

Sep. 30, 2020

Debt Disclosure [Abstract]

Debt

12. DEBT

Debt as of September 30, 2020 and December 31, 2019 consisted of the following:

	September 30,			December 31,
	2020			2019
Term Loan Facility	$	174,453		$	48,750
Revolving Line of Credit		—			97,590
Capital leases		3,127			3,765
Other leases		2			12
Equipment line of credit		3,214			3,124
Less deferred debt issuance costs		(4,345	)		(1,052	)
Total debt		176,451			152,189
Less current portion of long term debt		(5,034	)		(7,143	)
Long-term debt, less current portion	$	171,417		$	145,046

Deferred Financing Costs—Costs relating to debt issuance have been deferred and are presented as discounted against the underlying debt instrument. These costs are amortized to interest expense over the terms of the underlying debt instruments.

Revolving Line of Credit and Term Loan Facility— On April 13, 2020, the Company entered into a Unitranche Credit Agreement (the “New Credit Facility”) providing for a new $225.0 million credit facility comprised of a $175.0 million term loan and a $50.0 million revolving credit facility and repaid all amounts outstanding under the prior senior secured credit facility. The New Credit Facility matures in April 2025. As of September 30, 2020, the term loan and the revolver bore interest at LIBOR plus 5.0% with a 1.0% LIBOR floor or the base rate plus 4.0% and LIBOR plus 3.5% or the base rate plus 2.5%, respectively. See Note 22 regarding an amendment to the New Credit Facility reducing the interest rates on the term loan. The revolver is also subject to an unused commitment fee of 0.35%. The Term Loan has quarterly repayments starting on September 30, 2020 of $0.5 million, increasing to $1.1 million on September 30, 2021 and further increasing to $1.6 million on September 30, 2022, with the remaining outstanding principal amount due on the maturity date. The Company has the option to borrow incremental term loans up to an aggregate principal amount of $100.0 million subject to satisfaction of certain conditions, including the borrower’s pro forma compliance with the financial covenants under the New Credit Facility. Immediately after giving effect to the incurrence of any such incremental term loans, the unitranche lenders must collectively hold at least 70.0% of all pari passu debt of all lenders under the credit facility. The existing lenders are not obligated to participate in any incremental term loan facility.

The New Credit Facility includes a number of covenants imposing certain restrictions on the Company’s business, including, among other things, restrictions on the Company’s ability to incur indebtedness, prepay or amend other indebtedness, create liens, make certain fundamental changes including mergers or dissolutions, pay dividends and make other payments in respect of capital stock, make certain investments, sell assets, change the Company’s lines of business, enter into transactions with affiliates and other corporate actions. The New Credit Facility also contains financial covenants requiring the Company to remain below a maximum consolidated total leverage ratio of 4.25 times, which steps down to 4.00 times beginning December 31, 2021 and then to 3.75 times beginning December 31, 2022, and a minimum consolidated fixed charge coverage ratio of 1.25 times. The New Credit Facility contains mandatory prepayment features upon a number of events, including with the proceeds of certain asset sales, proceeds from the issuance of any debt and proceeds of the capital contribution amounts contributed to cure a financial covenant default. The New Credit Facility also includes mandatory prepayments of 50.0% of excess cash flow minus voluntary prepayments of the term loan and, solely to the extent accompanied by a permanent reduction in the revolving commitment, the revolver, if the Company’s consolidated total leverage ratio for the year ending December 31, 2020 is greater than or equal to 3.25 times and, for any year thereafter, the amount of any such mandatory prepayment shall be reduced to 25.0% of excess cash flow if the leverage ratio is less than 3.00 times.

The weighted average interest rate on the New Credit Facility as of September 30, 2020 was 6.0%.

The New Credit Facility contains a number of customary events of default related to, among other things, the non-payment of principal, interest or fees, violations of covenants, inaccuracy of representations or warranties, certain bankruptcy events, default in payment under or the acceleration of other indebtedness and certain change of control events. In the event of a default, subject to varying cure periods and rights for certain events of default, the required lenders may, at their option, declare the commitments to fund the credit facility to be terminated.

The Company’s obligations under the credit facility are guaranteed by certain of the Company’s existing and future direct and indirect subsidiaries, and such obligations are secured by substantially all of the Company’s assets, including the capital stock or other equity interests in those subsidiaries.

Prior Senior Secured Credit Facility—As of December 31, 2019, the Company’s Prior Senior Secured Credit Facility (the “Prior Senior Credit Facility”) consisted of a $50.0 million term loan and a $130.0 million revolving credit facility.

Borrowings under the Credit Facility bore interest at either (i) LIBOR plus the applicable margin or (ii) a base rate (equal to the highest of (a) the federal funds rate plus 0.5%, (b) Lender A’s prime rate and (c) Eurodollar Rate, which is based on LIBOR, (using a one-month period plus 1.0%), plus the applicable margin, as the Company elects. The applicable margin means a percentage per annum determined in accordance with the following table as of December 31, 2019:

Pricing Tier	Consolidated Leverage Ratio	Commitment Fee			Eurodollar Rate Loans and LIBOR Letter of Credit Fee			Daily Floating Rate Loans			Rate Loans
1	> 3.75 to 1.0		0.50	%		4.00	%		4.00	%		3.00	%
2	≤ 3.75 to 1.0 but > 3.00 to 1.0		0.50			3.50			3.50			2.50
3	≤ 3.00 to 1.0 but > 2.25 to 1.0		0.40			3.00			3.00			2.00
4	< 2.25 to 1.0		0.30			2.50			2.50			1.50

As of December 31, 2019, the Company fell within Pricing Tier 2 and the Company was subject to a fixed charge coverage ratio of greater than 1.25 and a consolidated total leverage ratio of lower than 4.00.

The Prior Senior Secured Credit Facility was repaid in full on April 13, 2020 via proceeds from the issuance of the New Credit Facility. The resulting loss on extinguishment amounted to $1.4 million, of which $0.4 million was related to fees paid and $1.0 million related to unamortized debt issuance costs. Total loss on extinguishment is recorded in interest expense-net within the condensed consolidated statement of operations for the nine months ended September 30, 2020.

Equipment Line of Credit—On March 12, 2019, the Company increased its equipment line of credit facility for the purchase of equipment and related freight, installation costs and taxes paid for an additional amount not to exceed $2.0 million. On May 16, 2019, the Company entered into a Canadian equipment line of credit facility for an amount not to exceed $1.0 million Canadian dollars. Interest on the line of credit is determined based on a three-year swap rate at the time of funding.

Capital Lease Obligations—The assets and liabilities under capital lease agreements are recorded at the lower of the present value of the minimum lease payments or the fair value of the asset. The assets are being amortized over the shorter of their related lease terms or their estimated useful lives ranging from four to six years. The gross amount of assets under capital leases as of September 30, 2020 and December 31, 2019 was $6.3 million and $6.9 million, respectively. The amortization of assets under capital leases was $0.6 million and $1.6 million for the three and nine months ended September 30, 2020, respectively and $0.4 million and $1.0 million for the three and nine months ended September 30, 2019, respectively and was included in depreciation and amortization on the condensed consolidated statements of operations. All capital leases (including those purchased through the Company’s equipment line of credit) mature by 2025 as follows:

September 30,	Payments		Interest		Principal
2021	$	2,670	$	368	$	2,302
2022		2,178		265		1,913
2023		1,582		139		1,443
2024		667		32		635
2025		49		1		48
	$	7,146	$	805	$	6,341

The following is a schedule of the aggregate annual maturities of long-term debt presented on the condensed consolidated statement of financial position, based on the terms of the credit facility, capital lease obligations and equipment line of credit as of September 30, 2020:

September 30,
2021	$	5,034
2022		6,839
2023		8,006
2024		7,198
2025		153,719
Total	$	180,796

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Fair Value of Financial Instruments

9 Months Ended

Sep. 30, 2020

Fair Value Disclosures [Abstract]

Fair Value of Financial Instruments

13. FAIR VALUE OF FINANCIAL INSTRUMENTS

As of September 30, 2020 and December 31, 2019, the following financial liabilities are measured at fair value on a recurring basis using significant unobservable inputs (Level 3).

	September 30,		December 31,
	2020		2019
Business acquisitions contingent consideration, current	$	49,170	$	8,614
Business acquisitions contingent consideration, long-term		9,742		379
Contingent put option		—		7,100
Warrant option		—		16,878
Conversion option		18,059		—
Total	$	76,971	$	32,971

The estimated fair value amounts shown above are not necessarily indicative of the amounts that the Company would realize upon disposition, nor do they indicate the Company’s intent or ability to dispose of the financial instrument.

The following table sets forth the Company’s financial instruments that were measured at fair value on a recurring basis for the nine months ended September 30, 2020 and September 30, 2019:

	Level 3
	Embedded Option			Business Acquisitions Contingent Consideration, Current(1)			Business Acquisitions Contingent Consideration, Long-term(2)			Contingent Put Option			Warrant Options			Total
Balance—at December 31, 2018	$	—		$	2,754		$	—		$	—		$	12,818		$	15,572
Acquisitions					31			—			—			—			31
Changes in fair value included in earnings		—			(670	)		—			—			4,059			3,389
Payment of contingent consideration         payable		—			(554	)		—			—			—			(554	)
Balance—at September 30, 2019	$	—		$	1,561		$	—		$	—		$	16,877		$	18,438
Balance—at December 31, 2019	$	—		$	8,614		$	379		$	7,100		$	16,878		$	32,971
Foreign currency translation of contingent        consideration payment		—			(208	)		—			—			—			(208	)
Payment of contingent consideration        payable		—			(12,464	)		—			—			—			(12,464	)
Acquisitions					34,661			10,543									45,204
Series A-2 compound embedded option		(9,361	)		—			—			—			—			(9,361	)
Issuance of warrant option		—			—			—			—			30,097			30,097
Reclass of long term to short term contingent       liabilities		—			180			(180	)		—			—			—
Changes in fair value included in earnings		27,420			18,387			(1,000	)		(19,240	)		9,312			34,879
Write off of the contingent put option		—			—			—			12,140			—			12,140
Exercise of warrant options		—			—			—			—			(56,287	)		(56,287	)
Balance—at September 30, 2020	$	18,059		$	49,170		$	9,742		$	—		$	—		$	76,971

(1) Current portion of the contingent consideration is recorded in business acquisitions contingent consideration, current.

(2) Long term portion of the contingent consideration is recorded in business acquisitions contingent consideration, long-term.

Quantitative Information about Assets and Liabilities Measured at Fair Value on a Recurring Basis Using Significant Unobservable Inputs (Level 3):

Business Acquisitions Contingent Consideration—The fair value of the contingent consideration payable associated with the acquisition of CTEH was determined using a Monte Carlo simulation of earnings in a risk-neutral Geometric Brownian Motion framework. The fair values of the contingent consideration payables for the other acquisitions were calculated based on expected target achievement amounts, which are measured quarterly and then subsequently adjusted to actuals at the target measurement date.

The method used to price these liabilities is considered level 3 due to the subjective nature of the unobservable inputs used to determine the fair value. The input is the expected achievement of earnout thresholds.

Conversion Option—The fair value of the embedded derivative associated with the issuance of the Convertible and Redeemable Series A-2 Preferred Stock (Note 16) was estimated using a “with-and-without” method. The “with-and-without” methodology considers the value of the security on an as-is basis and then without the embedded conversion premium. The difference between the two scenarios is the implied fair value of the embedded derivative. The unobservable input is the required rate of return on the Series A-2. The considerable quantifiable inputs in the valuation relate to the timing of conversions or redemptions.

Contingent Put Option—The fair value of the contingent put option associated with the issuance of the Redeemable Series A-1 Preferred Stock was estimated using a “with-and-without” method. The “with-and-without” methodology considers the value of the security on an as-is basis and then without the embedded contingent put option. The difference between the two scenarios is the implied fair value of the embedded derivative, recorded as the contingent put option liability. In this case the Series A-1 was redeemed on the date of value so the value of the “with” scenario is known. The unobservable input is the required rate of return on the Series A-1 through to maturity in the “without” scenario. The contingent put option was redeemed in July 2020 (Note 15).

Warrant Options—The warrant options were exercised on July 30, 2020 (Note 11). The fair value of the warrant options associated with the issuance of the Redeemable Series A-1 Preferred Stock and the Convertible and Redeemable Series A-2 Preferred Stock was calculated based on the Black-Sholes pricing model using the following assumptions:

	July 30,			September 30,
Series A-1 Preferred Stock Warrant Option	2020			2019
Common stock value (per share)	$	22.22		$	31.60
Expected volatility		44.35	%		47.63	%
Risk-free interest rate		0.55	%		1.68	%
Expected life (years)		10			10
	July 30,			September 30,
Series A-2 Preferred Stock Warrant Option	2020			2019
Common stock value (per share)	$	22.22		n/a
Expected volatility		44.35	%	n/a
Risk-free interest rate		0.55	%	n/a
Expected life (years)		10		n/a

The method used to price these liabilities is considered Level 3 due to the subjective nature of the unobservable inputs (common stock value and expected volatility) used to determine the fair value.

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Commitments and Contingencies

9 Months Ended

Sep. 30, 2020

Commitments And Contingencies Disclosure [Abstract]

Commitments and Contingencies

14. COMMITMENTS AND CONTINGENCIES

Operating Leases—The Company leases office facilities over various terms expiring through 2028. Certain of these operating leases contain rent escalation clauses. The Company also has office equipment leases that expire through 2025. The following is a schedule of the future minimum lease payments by year under the leases as of September 30, 2020:

September 30,	Rent		Office Equipment		Total
2021	$	5,863	$	332	$	6,195
2022		4,865		327		5,192
2023		2,961		129		3,090
2024		1,410		39		1,449
2025 and thereafter		1,385		1		1,386
	$	16,484	$	828	$	17,312

Total rent expense under operating leases was $2.2 and $6.4 for the three and nine months ended September 30, 2020, respectively, and $2.0 and $5.6 for the three and nine months ended September 30, 2019, respectively

Other Commitments—The Company has commitments under the New Credit Facility, its equipment line of credit and its capital lease obligations (Note 12).

Contingencies—The Company is subject to purchase price contingencies related to earn-outs associated with certain acquisitions (Note 6).

Legal—In the normal course of business, the Company is at times subject to pending and threatened legal actions. In management’s opinion, any potential loss resulting from the resolution of these matters is not expected to have a material effect on the condensed consolidated results of operations, financial position or cash flows of the Company.

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Redeemable Series A-1 Preferred Stock

9 Months Ended

Sep. 30, 2020

Temporary Equity Disclosure [Abstract]

Redeemable Series A-1 Preferred Stock

15. REDEEMABLE SERIES A-1 PREFERRED STOCK

On October 19, 2018, the Company issued 12,000 shares of Redeemable Series A-1 Preferred Stock with a par value of $0.0001 per share and a detachable warrant to purchase 534,240 shares of the Company’s common stock. Each preferred share was issued as part of a unit, which consisted of one share of the Redeemable Series A-1 Preferred Stock at $0.01 million per share.

On April 13, 2020, the Company amended and restated the certificate of designation of the Company’s Redeemable Series A-1 Preferred Stock. The most significant changes in the amendment included (i) the Redeemable Series A-1 Preferred Stock became pari passu with the Convertible and Redeemable Series A-2 Preferred Stock (Note 16), (ii) the maturity was extended to October 2024; (iii) the Company could use up to $50.0 million of indebtedness or cash on hand to redeem the Redeemable Series A-1 Preferred Stock, and (iv) upon an IPO, up to 50.0% of accumulated dividends could be paid in shares of common stock and (v) the Company could elect to reduce the three year make whole penalty to a two year make whole penalty if the warrant issued in connection with the issuance of the Redeemable Series A-1 Preferred Stock was redeemed in full at a share price of no less than $31.60. Following a partial redemption of outstanding Redeemable Series A-1 Preferred Stock, the dividend rate of the remaining Redeemable Series A-1 Preferred Stock would be reduced proportionally (between 15.0% and 9.0%) in relation to the proportion of Redeemable Series A-1 Preferred Stock redeemed, with the rate increasing by an additional 1.0% for dividends that are accrued versus paid in cash. Based on a qualitative assessment performed by the Company, the Redeemable Series A-1 Preferred Stock amendments did not represent a significant long-term change to the original terms of the instrument and, therefore, there was no change in the accounting of the instrument.

On July 27, 2020, the Company redeemed in full the Redeemable Series A-1 Preferred Stock, including the guaranteed minimum two-year dividend. The Company used $131.8 million of the IPO proceeds and 1,786,739 shares of common stock to redeem all outstanding shares of the Company’s Redeemable Series A-1 Preferred Stock. The total accreted value immediately prior to redemption was $40.8 million. The difference between the fair value of the consideration transferred to the holder of the Series A-1 Preferred Stock and the instrument’s carrying value immediately before the redemption of $24.3 million, was treated as a deemed dividend to the holder.

The Redeemable Series A-1 Preferred Stock contained restrictive covenants. As of December 31, 2019, the Company was subject to a consolidated total leverage ratio (including the outstanding principal and accrued dividend on the Redeemable Series A-1 Preferred Stock) limit of less than 10.0 times as of the end of any fiscal quarter ending until maturity. The Company was in compliance with the covenants as of December 31, 2019.  

Before redemption, the Redeemable Series A-1 Preferred Stock accrued dividends quarterly at an annual rate of 15.0% with respect to dividends that were paid in cash and at an annual rate of 14.2% with respect to dividends that were accrued. Total accrued and unpaid dividends as of December 31, 2019 were $21.9 million.

At issuance the Company determined that the detachable warrant (Note 11) and the contingent put option were required to be accounted for separately. As of July 27, 2020 and December 31, 2019, the contingent put option issued in connection with the Redeemable Series A-1 Preferred Stock had a fair value of $12.1 million and $7.1 million, respectively. The change in value of $26.3 million and $19.2 million for the three and nine months ended September 30, 2020 was recorded to other expense.

As of September 30, 2019, the Company determined that the fair value of the contingent put option related to the Redeemable Series A-1 Preferred Stock was immaterial as the probability of the feature being exercised was considered remote.

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Convertible and Redeemable Series A-2 Preferred Stock

9 Months Ended

Sep. 30, 2020

Temporary Equity Disclosure [Abstract]

Convertible and Redeemable Series A-2 Preferred Stock

16. CONVERTIBLE AND REDEEMABLE SERIES A-2 PREFERRED STOCK

On April 13, 2020, the Company entered into an agreement to issue 17,500 shares of the Convertible and Redeemable Series A-2 Preferred Stock with a par value of $0.0001 per share and a detachable warrant to purchase shares of the Company’s common stock with a 10-year life, in exchange for gross proceeds of $175.0 million, net of $1.3 million debt issuance costs. Before the Company’s IPO, each share of Convertible and Redeemable Series A-2 Preferred Stock accrued dividends at the rate of 15.0% per annum, with respect to dividends that were paid in cash, and 14.2% per annum, with respect to dividends that were accrued. The Company paid dividends on shares of the Convertible and Redeemable Series A-2 Preferred Stock of $2.9 million during the three and nine months ended September 30, 2020.

At issuance, the Company determined that Convertible and Redeemable Series A-2 Preferred Stock and the detachable warrant (Note 11), were required to be accounted for separately.

Upon the Company’s IPO, following which the Redeemable Series A-1 Preferred Stock was fully redeemed, the Convertible and Redeemable Series A-2 Preferred Stock terms automatically updated to the following: (i) no mandatory redemption, (ii) no stated value cash repayment obligation other than in the event of certain defined liquidation events, (iii) only redeemable at the Company’s option, (iv) the instrument became convertible into common stock beginning on the four year anniversary of issuance at a 15.0% discount to the common stock market price (with a limit of $60.0 million in stated value of Convertible and Redeemable Series A-2 Preferred Stock eligible to be converted in any 60-day period prior to the seventh anniversary of issuance and the amount of stated value of the Convertible and Redeemable Series A-2 Preferred Stock eligible for conversion limited to $60.0 million during year 5 and $120.0 million (which includes the aggregate amount of the stated value of the Convertible and Redeemable Series A-2 Preferred Stock and any accrued but unpaid dividends added to such stated value of any shares of Convertible and Redeemable Series A-2 Preferred Stock converted in year 5) during year 6), (v) the dividend rate stepped down to 9.0% per year with required quarterly cash payments, (vi) in an event of noncompliance, the dividend rate shall increase to 12.0% per annum for the first 90-day period from and including the date the noncompliance event occurred, and thereafter shall increase to 14.0% per annum, (vii) the debt incurrence test ratio increased to 4.5 times, (viii) the total leverage cap covenant was removed, and (ix) minimum repayment amount dropped down from $50.0 million to $25.0 million.

The Company may, at its option on any one or more dates, redeem all or a minimum portion (the lesser of (i) $25.0 million in aggregate stated value of the Convertible and Redeemable Series A-2 Preferred Stock and (ii) all of the Convertible and Redeemable Series A-2 Preferred Stock then outstanding) of the outstanding Convertible and Redeemable Series A-2 Preferred Stock in cash. In the event the Company redeems all or a portion of the Convertible and Redeemable Series A-2 Preferred Stock prior to the three year anniversary of the issuance date, such redemption amount shall include stated value, accrued but unpaid dividends and a make whole payment such that the aggregate redemption amount reflects three years of dividends.

With respect to any redemption of any share of the Convertible and Redeemable Series A-2 Preferred Stock prior to the third-year anniversary, the Company is subject to a make whole penalty in which the holders of the Convertible and Redeemable Series A-2 Preferred Stock are guaranteed a minimum repayment equal to outstanding redeemed stated value plus three years of dividends accrued or accruable thereon.

The Convertible and Redeemable Series A-2 Preferred Stock does not meet the definition of a liability pursuant to “ASC 480- Distinguishing Liabilities from Equity.” However, as (i) the instrument is redeemable upon a change of control as defined in the certificate of designations governing the terms of the Convertible and Redeemable Series A-2 Preferred Stock, and (ii) the Company cannot assert it would have sufficient authorized and unissued shares of common stock to settle all future conversion requests due to the variable conversion terms, the instrument is redeemable upon the occurrence of events that are not solely within the control of the Company, and therefore the Company classifies the Convertible and Redeemable Series A-2 Preferred Stock as mezzanine equity. Subsequent adjustment of the carrying value of the instrument is required if the instrument is probable of becoming redeemable. As of September 30, 2020, the Company has determined that a change of control is not probable. Additionally, as of September 30, 2020, the Company has determined that it is not probable that there will be a future conversion request that the Company is unable to settle with authorized and issued shares based on the Company’s current stock price and available shares as well as the Company’s monitoring efforts to ensure there are a sufficient number of shares available to settle any conversion request. Therefore, as of September 30, 2020, the Company has determined that the instrument is not probable of becoming redeemable, and does not believe subsequent adjustment of the carrying value of the instrument will be necessary. The Convertible and Redeemable Series A-2 Preferred Stock had an aggregate liquidation preference of $182.2 million as of September 30, 2020.

The Convertible and Redeemable Series A-2 Preferred Stock contains embedded features that are required to be bifurcated and are subject to separate accounting treatment from the instrument itself. At issuance, these embedded features consisted of (i) a contingent dividend feature associated with the decrease in the dividend rate upon an IPO and (ii) a conversion option of the preferred shares to shares of common stock beginning on the fourth-year anniversary of the issuance date. Upon the Company’s IPO, the embedded derivative only consisted of the conversion option. As of September 30, 2020, this conversion embedded feature had a net fair value of $18.1 million. The change in value of $26.7 million and $27.4 million for the three and nine months ended September 30, 2020 was recorded to other expense.

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Stockholder's Equity (Deficit)

9 Months Ended

Sep. 30, 2020

Equity [Abstract]

Stockholders' Deficit

17. STOCKHOLDERS’ EQUITY (DEFICIT)

Authorized Capital Stock—The Company was authorized to issue 190,000,000 and 25,000,000 shares of common stock, with a par value of $0.000004 per share as of September 30, 2020 and December 31, 2019, respectively.

Warrants—In May 2015, the Company issued warrants to acquire 116,350 shares of Common Stock at a price of approximately $17.19 per share to the placement agent as consideration for backstopping the financing completed in May 2015. There were no changes related to these warrants during the three and nine months ended September 30, 2020 and September 30, 2019.

Common Stock Issuances and Cancellations—During the three and nine months ended September 30, 2020 and September 30, 2019, the Company issued and cancelled the following shares of common stock:    

	Three Months Ended September 30,									Nine Months Ended September 30,
	2020					2019				2020					2019
	Shares			Average Price per Share		Shares		Average Price per Share		Shares			Average Price per Share		Shares		Average Price per Share
Common stock issued    in connection with initial public    offering		11,500,000		$	15.00		—	$	—		11,500,000		$	15.00		—	$	—
Acquisitions		—			—		25,408		26.90		791,139			31.60		150,439		22.41
Redemption of series A-1 preferred stock		1,786,739			15.00		—		—		1,786,739			15.00		—		—
Exercise of warrant options		2,534,239			0.01		—		—		2,534,239			0.01		—		—
Exercise of options		16,850			8.92		7,150		6.03		20,350			9.27		22,675		18.01
Restricted shares, net		8,333			24.00		—		—		8,333			24.00		—		—
Cancellation of shares		(117,785	)		17.15		—		—		(117,785	)		17.15		—		—
		15,728,376		$	12.82		32,558	$	22.32		16,523,015		$	13.72		173,114	$	21.83

Employee Equity Incentive Plans—The Company has two plans under which stock-based awards have been issued: (i) the Montrose Amended & Restated 2017 Stock Incentive Plan (“2017 Plan”) and (ii) the Montrose Amended & Restated 2013 Stock Option Plan (“2013 Plan”) (collectively the “Plans”).

As of September 30, 2020 and September 30, 2019, there was $10.4 million and $6.7 million, respectively, of total unrecognized stock compensation expense related to unvested options and restricted stock granted under the Plans. Such unrecognized expense is expected to be recognized over the next two years. The following number of shares were authorized to be issued and available for grant as of September 30, 2020 and September 30, 2019:

	September 30, 2020
	2017 Plan		2013 Plan
Shares authorized to be issued		2,945,443		2,047,269
Shares available for grant		1,233,266		—
	September 30, 2019
	2017 Plan		2013 Plan
Shares authorized to be issued		981,800		2,074,604
Shares available for grant		159,428		—

Total stock compensation expense for the Plans was as follows:

	Three Months Ended September 30,
	2020									2019
	2017 plan				2013 plan					2017 plan				2013 plan
	Options		Restricted Stock		Options			Total		Options		Restricted Stock		Options		Total
Cost of revenue	$	276	$	—	$	(5	)	$	271	$	278	$	—	$	97	$	375
Selling, general and administrative expense		592		233		53			878		185		111		384		680
	$	868	$	233	$	48		$	1,149	$	463	$	111	$	481	$	1,055

	Nine Months Ended September 30,
	2020								2019
	2017 plan				2013 plan				2017 plan				2013 plan
	Options		Restricted Stock		Options		Total		Options		Restricted Stock		Options		Total
Cost of revenue	$	973	$	—	$	126	$	1,099	$	623	$	—	$	390	$	1,013
Selling, general and administrative expense		1,178		973		189		2,340		457		323		1,784		2,564
	$	2,151	$	973	$	315	$	3,439	$	1,080	$	323	$	2,174	$	3,577

Montrose Amended & Restated 2017 Stock Incentive Plan

Restricted Stock—During the nine months ended September 30, 2020 and September 30, 2019, the Company issued 33,229 and 30,000 shares of restricted stock with a fair market value of $31.60 and $24.00 per share, respectively, to certain 2017 Plan participants as Director’s compensation. These shares of restricted stock granted in the nine months ended September 30, 2020 vest one year from the date of grant and the shares of restricted stock granted during the nine months ended September 30, 2019 vest over three years, or, in each case, in full upon a change in control, subject to the participant’s continued service as a Director throughout such date, or upon retirement. Members of the Board of Directors that receive stock-based compensation are treated as employees for accounting purposes. There were 10,000 shares of restricted stock that became fully vested and were released as unrestricted shares of common stock during the nine months ended September 30, 2020. No restricted shares vested and were released as unrestricted shares of common stock during the nine months ended September 30, 2019. There were 1,667 shares of restricted stock that were forfeited during the nine months ended September 30, 2020. There were no forfeitures of restricted shares during the nine months ended September 30, 2019. There were an aggregate of 267,173 and 242,025 restricted shares outstanding as of September 30, 2020 and September 30, 2019, respectively.

Options—Options issued to all optionees under the 2017 Plan vest over four years from the date of issuance (or earlier vesting start date, as determined by the Board of Directors) as follows: one half on the second anniversary of date of grant and the remaining half on the fourth anniversary of the date of grant, with the exception of certain annual grants to certain executive officers, which vest annually over a 3-year period. The following summarizes the options activity of the 2017 Plan for the nine months ended September 30, 2020 and September 30, 2019:

	Options to Purchase Common Stock			Weighted- Average Exercise Price per Share		Weighted Average Grant Date Fair Value per Share		Weighted Average Remaining Contract Life (in Years)		Aggregate Intrinsic Value of In-The- Money Options (in Thousands)
Outstanding at December 31, 2018		257,762		$	20	$	10		-	$	1,151
Granted		356,470			27		14		-		—
Forfeited/ cancelled		(17,700	)		19		—		-		—
Outstanding at September 30, 2019		596,532			24		12		8.07		4,693
Outstanding at December 31, 2019		617,852			24		12		7.82		4,693
Granted		851,877			32		12		-		—
Forfeited/ cancelled		(14,375	)		22		—		-		—
Exercised		(925	)		14		—		-		7,918
Outstanding at September 30, 2020		1,454,429			21		12		7.59		7,649
Exercised at September 30, 2020		925			14		—		7.33		7,649
Options vested and expected to vest		1,454,429			21				9.04		7,649

The following weighted-average assumptions were used in the Black-Sholes option-pricing model calculation for the nine months ended September 30, 2020 and September 30, 2019:

	September 30,		September 30,
	2020		2019
Common stock value (per share)	$	16.36	$	27.30
Expected volatility		46.14		47.94
Risk-free interest rate		0.41		2.15
Expected life (years)		7		7
Forfeiture rate	None		None
Dividend rate	None		None

Montrose Amended & Restated 2013 Stock Option Plan—The following summarizes the activity of the 2013 Plan for the nine months ended September 30, 2020 and September 30, 2019:

	Options to Purchase Common Stock			Weighted- Average Exercise Price per Share		Weighted Average Grant Date Fair Value per Share		Weighted Average Remaining Contract Life (in Years)		Aggregate Intrinsic Value of In-The- Money Options (in Thousands)
Outstanding at December 31, 2018		1,900,404		$	6	$	1		7.30		33,290
Forfeited/ cancelled		(14,500	)		8		—		-		—
Expired		(5,400	)		8		—		-		—
Exercised		(19,010	)		6		—		-		466
Outstanding at September 30, 2019		1,861,494			6		1		6.65		47,381
Outstanding at December 31, 2019		1,855,469			6		1		6.40		46,617
Forfeited/ cancelled		(7,500	)		10		—		-		—
Expired		(11,300	)		6		—		-		—
Exercised		(19,175	)		8		—		-		354
Outstanding at September 30, 2020		1,817,494			6		1		5.63		33,772
Exercised at September 30, 2020		221,025			6		—		5.14		33,772
Options vested and expected to vest		1,817,494			6		—		5.17		33,772

Total shares outstanding from exercised options were 221,950 shares and 201,600 shares as of September 30, 2020 and December 31, 2019.

Common Stock Reserved for Future Issuances—At September 30, 2020 and September 30, 2019, the Company has reserved certain stock of its authorized but unissued common stock for possible future issuance in connection with the following:

	September 30,		December 31,
	2020		2019
Warrants		116,350		650,590
Montrose 2013 Stock Incentive Plan		2,047,269		2,058,619
Montrose 2017 Stock Incentive Plan		2,945,443		997,785
Common stock reserved for future issuance		5,109,062		3,706,994

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Net Loss Per Share

9 Months Ended

Sep. 30, 2020

Earnings Per Share [Abstract]

Net Loss per Share

18. NET LOSS PER SHARE

Basic net loss per share is computed by dividing net loss attributable to common stockholders by the weighted average number of common shares outstanding during each period. The Redeemable Series A-1 Preferred Stock, which was outstanding prior to its redemption on July 27, 2020, and the Convertible and Redeemable Series A-2 Preferred Stock are considered a participating security. Net losses are not allocated to the Redeemable Series A-1 Preferred stockholders nor the Convertible and Redeemable Series A-2 stockholders, as they were not contractually obligated to share in the Company’s losses.

Diluted net loss per share is computed by dividing net loss attributable to common stockholders by the weighted average number of common and dilutive common equivalent shares outstanding for the period using the treasury-stock method or the as-converted method. During the three and nine months ended September 30, 2019, up until the warrant options were exercised (Note 11), shares issuable in connection with the warrant options were considered outstanding common shares for purposes of calculating net loss per share since they do not contain any conditions that must be satisfied for the holder to exercise the warrant. Potentially dilutive shares are comprised of restricted stock and shares of common stock underlying stock options outstanding under the Plans and warrants (other than warrant options) to purchase common stock. During the three and nine months ended September 30, 2020 and September 30, 2019, there is no difference in the number of shares used to calculate basic and diluted shares outstanding due to the Company’s net loss and potentially dilutive shares being anti-dilutive.

The following table summarizes the computation of basic and diluted net loss per share attributable to common stockholders of the Company for the three and nine months ended September 30, 2020 and September 30, 2019:

	Three Months Ended September 30,						Nine Months Ended September 30,
In thousands, except for net loss per share	2020			2019			2020			2019
Net loss	$	(30,737	)	$	(6,683	)	$	(58,761	)	$	(12,247	)
Accretion of redeemable series A-1 preferred stock		(6,542	)		(5,030	)		(17,601	)		(14,341	)
Redeemable series A-1 preferred stock deemed dividend		(24,341	)		—			(24,341	)		—
Convertible and redeemable series A-2 preferred stock dividend		(2,870	)		—			(2,870	)		—
Net loss attributable to common stockholders – basic    and diluted		(64,490	)		(11,713	)		(103,573	)		(26,588	)
Weighted-average common shares outstanding –    basic and diluted		21,554			8,718			13,669			8,640
Net loss per share attributable to common stockholders –    basic and diluted	$	(2.99	)	$	(1.34	)	$	(7.58	)	$	(3.08	)

The following equity shares were excluded from the calculation of diluted net loss per share attributable to common stockholders because their effect would have been anti-dilutive for the three and nine months ended September 30, 2020 and September 30, 2019:

	September 30,
	2020		2019
Stock options		2,423,900		2,062,825
Restricted stock		176,384		158,426
Warrants		116,350		116,350

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Segment Information

9 Months Ended

Sep. 30, 2020

Segment Reporting [Abstract]

Segment Information

19. SEGMENT INFORMATION

The Company has three operating and reportable segments: Assessment, Permitting and Response, Measurement and Analysis and Remediation and Reuse. These segments are monitored separately by management for performance against budget and prior year and are consistent with internal financial reporting. The Company’s operating segments are organized based upon primary services provided, the nature of the production process, their type of customers, methods used to distribute the products and the nature of the regulatory environment.

Segment Adjusted EBITDA is the primary measure of operating performance for all three operating segments. Segment Adjusted EBITDA is the calculated Company’s Earnings before Interest, Tax, Depreciation and Amortization (“EBITDA”), adjusted to exclude certain transactions such as stock-based compensation, acquisition costs and fair value changes in financial instruments, amongst others. The Chief Operating Decision Maker (“CODM”) does not review segment assets as a measure of segment performance.

Corporate and Other includes costs associated with general corporate overhead (including executive, legal, finance, safety, human resources, marketing and IT related costs) that are not directly related to supporting operations. Overhead costs that are directly related to supporting operations (such as insurance, software, licenses, shared services and payroll processing costs) are allocated to the operating segments on a basis that reasonably approximates an estimate of the use of these services.

Segment revenues and Adjusted EBITDA for the three and nine months ended September 30, 2020 and September 30, 2019 were as follows:

	Three Months Ended September 30,										Nine Months Ended September 30,
	2020					2019					2020					2019
			Segment					Segment					Segment					Segment
	Segment		Adjusted			Segment		Adjusted			Segment		Adjusted			Segment		Adjusted
	Revenues		EBITDA			Revenues		EBITDA			Revenues		EBITDA			Revenues		EBITDA
Assessment, Permitting and Response	$	26,593	$	8,230		$	5,413	$	1,695		$	49,768	$	14,665		$	15,017	$	5,693
Measurement and Analysis		39,770		11,226			35,672		7,691			113,130		30,422			98,521		19,761
Remediation and Reuse		18,342		2,012			16,538		2,400			56,604		6,495			52,440		7,317
Total Operating Segments		84,705		21,468			57,623		11,786			219,502		51,582			165,978		32,771
Corporate and Other		—		(4,762	)		—		(3,567	)		—		(15,425	)		—		(10,935	)
Total	$	84,705	$	16,706		$	57,623	$	8,219		$	219,502	$	36,157		$	165,978	$	21,836

Presented below is a reconciliation of the Company’s segment measure to loss before benefit from income taxes for the three and nine months ended September 30, 2020 and September 30, 2019:

	For the Three Months Ended September 30,						For the Nine Months Ended September 30,
	2020			2019			2020			2019
Total	$	16,706		$	8,219		$	36,157		$	21,836
Interest expense, net		(3,043	)		(2,130	)		(10,896	)		(4,590	)
Income tax (expense) benefit		(3,348	)		412			1,563			1,308
Depreciation and amortization		(9,740	)		(7,412	)		(27,084	)		(20,262	)
Stock-based compensation		(1,149	)		(1,055	)		(3,439	)		(3,577	)
Start-up losses and investment in new services		(602	)		(634	)		(1,283	)		(1,091	)
Acquisition costs		(6	)		(1,278	)		(3,767	)		(2,350	)
Fair value changes in contingent put option		26,265			—			19,240			—
Fair value changes in warrant options		(9,311	)		(2,510	)		(9,312	)		(4,059	)
Fair value changes in compound embedded option		(26,664	)		—			(27,420	)		—
Fair value changes in business acquisitions contingent consideration		(13,404	)		(256	)		(17,387	)		670
Short term purchase accounting fair value adjustment    to deferred revenue		—			—			(243	)		—
IPO preparation costs and IPO related bonuses		(6,378	)		(20	)		(6,908	)		(105	)
Discontinued services (i)		(30	)		—			(7,526	)		—
Expenses related to financing transactions		—			—			(277	)		—
Other expenses		(33	)		(19	)		(179	)		(27	)
Net loss	$	(30,737	)	$	(6,683	)	$	(58,761	)	$	(12,247	)

(i)During the first quarter of 2020, the Company determined to reduce the footprint of its environmental lab in Berkeley, California, and to exit its non-specialized municipal water engineering service line and its food waste biogas engineering service line. As a part of discontinuing service lines, the Company made the decision to book an additional bad debt reserve related to the uncertainty around the ability to collect on receivables related to these service lines (Note 3). It was determined that the discontinuation of these service lines did not represent a strategic shift that had (or will have) a major effect on the Company’s operations and financial results therefore did not meet the requirements to be classified as discontinued operations.

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Related-Party Transactions

9 Months Ended

Sep. 30, 2020

Related Party Transactions [Abstract]

Related-Party Transactions

20. RELATED-PARTY TRANSACTIONS

The Company engages a related party to provide Quality of Earnings reports on acquisition targets. The Company paid this related party approximately zero and $0.1 million during the three and nine months ended September 30, 2020 and $0.1 million and $0.4 million during the three and nine months ended September 30, 2019, respectively for its services. This expense is included within selling, general and administrative on the condensed consolidated statements of operations. As of September 30, 2020 and December 31, 2019, the Company had no significant unpaid invoices to this related party, which would be/are included in accounts payable and other accrued liabilities on the condensed consolidated statements of financial position. The related party used by the Company is partially owned through investment vehicles controlled by certain members of the Company’s Board of Directors.

During the three months ended September 30, 2020, the holder of the Redeemable Series A-1 Preferred Stock and Convertible and Redeemable A-2 Preferred Stock became a stockholder in the Company. On the redemption date of the Redeemable Series A-1 Preferred Stock (Note 15), the Company issued 1,786,739 shares of common stock as dividend payment. Additionally, this related party exercised its warrant options (Note 11), becoming the holder of 2,534,239 additional common shares. This related party owns 17.3% of the total common shares outstanding as of September 30, 2020.

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Defined Contribution Plan

9 Months Ended

Sep. 30, 2020

Compensation And Retirement Disclosure [Abstract]

Defined Contribution Plan

21. DEFINED CONTRIBUTION PLAN

On January 1, 2014, the Company established the Montrose Environmental Group 401(k) Savings Plan. As of September 30, 2020 and December 31, 2019, plan participants may defer up to 85.0% of their eligible wages for the year, up to the Internal Revenue Service dollar limit and catch up contribution allowed by law. Up to May 22, 2020, the Company provided employer matching contributions equal to 100.0% of the first 3.0% of the participant’s compensation and 50.0% of the participant’s elective deferrals that exceed 3.0% but do not exceed 4.0% of the participant’s compensation. Subsequent to May 22, 2020, the Company temporarily ceased making employer contributions. Employer contributions for the three and nine months ended September 30, 2020 were zero and $1.2 million, respectively, and $0.5 million and $1.9 million for the three and nine months ended September 30, 2019, respectively, and are included within selling, general, and administrative expenses on the condensed consolidated statements of operations.

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Subsequent Events

9 Months Ended

Sep. 30, 2020

Subsequent Events [Abstract]

Subsequent Events

22. SUBSEQUENT EVENTS

Effective October 6, 2020, the Company amended the New Credit Facility to provide for a reduction on the applicable interest rate on the term loan from LIBOR plus 5.0% with a 1.0% LIBOR floor to LIBOR plus 4.5% with a 1.0% LIBOR floor. The revolver interest rate remained unchanged.

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Description of the Business and Basis of Presentation (Policies)

9 Months Ended

Sep. 30, 2020

Organization Consolidation And Presentation Of Financial Statements [Abstract]

Basis of Presentation

Basis of Presentation—The unaudited condensed consolidated financial statements include the operations of the Company and its wholly-owned subsidiaries. These unaudited condensed consolidated financial statements are presented in conformity with accounting principles generally accepted in the United States (“U.S. GAAP”) and have been prepared pursuant to the rules and regulations of the U.S. Securities and Exchange Commission (“SEC”) that permit reduced disclosure for interim periods. The unaudited condensed consolidated financial statements include all accounts of the Company and, in the opinion of management, include all recurring adjustments and normal accruals necessary for a fair statement of the Company’s financial position, results of operations and cash flows for the dates and periods presented. These unaudited condensed consolidated financial statements should be read in conjunction with the Company’s audited financial statements as of and for the year ended December 31, 2019. Results for interim periods are not necessarily indicative of the results to be expected during the remainder of the current year or for any future period. All intercompany transactions, accounts and profits, have been eliminated in the condensed consolidated financial statements.

Recently Adopted Accounting Pronouncements /Recently Issued Accounting Pronouncements Not Yet Adopted

Recently Adopted Accounting Pronouncements— The Company qualifies as an emerging growth company as defined in the Jumpstart Our Business Startups Act of 2012 (“JOBS Act”) and therefore intends to take advantage of certain exemptions from various public company reporting requirements, including delaying adoption of new or revised accounting standards until those standards apply to private companies. The Company has elected to use this extended transition period under the JOBS Act. The effective dates shown below reflect the election to use the extended transition period.

In June 2018, the Financial Accounting Standards Board (“FASB”) issued Accounting Standard Update (“ASU”) 2018-07, Compensation—Stock Compensation: Improvements to Nonemployee Share-Based Payment Accounting. Under the revised guidance, the accounting for awards issued to non-employees will be similar to the accounting for employee awards. The new guidance is effective for fiscal years beginning after December 15, 2019. The standard was adopted as of January 1, 2020 and did not have a material impact on the Company’s condensed consolidated financial statements.

In January 2017, the FASB issued ASU 2017-04, Intangibles—Goodwill and Other (Topic 350): Simplifying the Accounting for Goodwill Impairment. The revised guidance eliminates Step 2 of the current goodwill impairment analysis test, which requires hypothetical purchase price allocation to measure goodwill impairment. A goodwill impairment loss will instead be measured at the amount by which a reporting unit’s carrying amount exceeds its fair value, not to exceed the carrying amount of goodwill. The revised guidance was adopted as of January 1, 2020 and did not have a material impact on the Company’s condensed consolidated financial statements.

Recently Issued Accounting Pronouncements Not Yet Adopted— In August 2020, the FASB issued ASU 2020-06, Debt—Debt with Conversion and Other Options (Subtopic 470-20) and Derivatives and Hedging—Contracts in Entity’s Own Equity (Subtopic 815-40)—Accounting for Convertible Instruments and Contracts in an Entity’s Own Equity. The ASU simplifies accounting for convertible instruments by removing major separation models required under current GAAP. Consequently, more convertible debt instruments will be reported as a single liability instrument with no separate accounting for embedded conversion features. The ASU removes certain settlement conditions that are required for equity contracts to qualify for the derivative scope exception, which will permit more equity contracts to qualify for the exception. The ASU also simplifies the diluted net income per share calculation in certain areas. The new guidance is effective for fiscal years beginning after December 15, 2023, including interim periods within those fiscal years, and early adoption is permitted. The Company is currently evaluating the impact of the adoption of the standard on the condensed consolidated financial statements.

In March 2020, the FASB issued ASU 2020-04, Reference Rate Reform (Topic 848): Facilitation of the Effects of Reference Rate Reform on Financial Reporting. ASU 2020-04 provides optional expedients and exceptions for applying GAAP to contracts, hedging relationships and other transactions affected by the expected transition away from reference rates that are expected to be discontinued, such as LIBOR. ASU 2020-04 was effective upon issuance. The Company may elect to apply the guidance prospectively through December 31, 2022. The Company is currently evaluating the impact of the adoption of the standard on the condensed consolidated financial statements.

In December 2019, the FASB issued ASU 2019-12, Income Taxes (Topic 740): Simplifying the Accounting for Income Taxes. ASU 2019-12 removes certain exceptions to the general principles in ASC 740 and clarifies and amends certain guidance to promote consistent application. ASU 2019-12 is effective for the Company’s annual and interim periods beginning on January 1, 2021, with early adoption permitted. Depending on the amendment, adoption may be applied on a retrospective, modified retrospective or prospective basis. The Company is currently evaluating the impact of the adoption of the standard on the condensed consolidated financial statements and does not anticipate the standard to have a significant impact.

In June 2016, the FASB issued ASU 2016-13, Financial Instruments—Credit Losses (Topic 326). The standard introduces a new model for recognizing credit losses on financial instruments based on an estimate of current expected credit losses and will apply to trade receivables. The new guidance will be effective for the Company’s annual and interim periods beginning after December 15, 2022. The Company is currently evaluating the impact of the adoption of the standard on the condensed consolidated financial statements and does not anticipate the standard to have a significant impact.

In February 2016, the FASB issued ASU 2016-2, Leases (Topic 842), to improve financial reporting regarding leasing transactions. The ASU primarily affects the accounting by the lessee in that it requires a lessee to recognize lease assets and liabilities, initially measured at the present value of the lease payments, on the balance sheets for those leases classified as operating leases under previous guidance. The new leasing standard is effective for the Company’s annual and interim periods beginning after December 15, 2021. The new leasing standard requires modified retrospective transition. The Company is currently evaluating the impact of the adoption of the updated standard on the condensed consolidated financial statements, but anticipates a material increase in assets and liabilities due to the recognition of the required right-of-use asset and corresponding liability for all significant lease obligations that are currently classified as operating leases.

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Revenues and Accounts Receivable (Tables)

9 Months Ended

Sep. 30, 2020

Revenues And Accounts Receivable [Abstract]

Schedule of Contract Balances

The following table presents the Company’s contract balances:

	September 30,		December 31,
	2020		2019
Contract assets	$	35,441	$	13,605
Contract liabilities		9,335		3,314

Schedule of Accounts Receivable, Net

Accounts receivable, net as of September 30, 2020 and December 31, 2019 consisted of the following:

	September 30,			December 31,
	2020			2019
Accounts receivable, invoiced	$	52,372		$	46,643
Accounts receivable, other		929			611
Allowance for doubtful accounts		(8,516	)		(1,327	)
Accounts receivable—net	$	44,785		$	45,927

Schedule of Allowance for Doubtful Accounts

The allowance for doubtful accounts as of September 30, 2020 and December 31, 2019 consisted of the following:

	Beginning Balance		Bad Debt Expense		Charged to Allowance			Other(1)		Ending Balance
Nine months ended September 30, 2020	$	1,327	$	6,445	$	(294	)	$	1,038	$	8,516
Year ended December 31, 2019		453		1,246		(556	)		184		1,327

(1) This amount consists of additions to the allowance due to business acquisitions.

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Prepaid and Other Current Assets (Tables)

9 Months Ended

Sep. 30, 2020

Deferred Costs Capitalized Prepaid And Other Assets Disclosure [Abstract]

Schedule of Prepaid and Other Current Assets

Prepaid and other current assets as of September 30, 2020 and December 31, 2019 consisted of the following:

	September 30,		December 31,
	2020		2019
Deposits	$	733	$	605
Prepaid expenses		1,665		1,235
Prepaid insurance		2,577		170
Supplies		2,428		2,368
Offering costs		—		1,240
Income tax receivable		1,182		1,205
Prepaid and other current assets	$	8,585	$	6,823

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Property and Equipment (Tables)

9 Months Ended

Sep. 30, 2020

Property Plant And Equipment [Abstract]

Property and Equipment, Net

Property and equipment, net, as of September 30, 2020 and December 31, 2019 consisted of the following:

	Estimated	September 30,			December 31,
	Useful Life	2020			2019
Lab and test equipment	7 years	$	17,755		$	14,810
Vehicles	5 years		12,869			11,073
Equipment	3–7 years		31,539			29,922
Furniture and fixtures	7 years		2,854			1,119
Leasehold improvements	7 years		6,758			5,954
Aircraft	10 years		834			—
Building	39 years		2,975			—
			75,584			62,878
Land			725			—
Construction in progress			156			796
Less accumulated depreciation			(41,906	)		(36,638	)
Total property and equipment—net		$	34,559		$	27,036

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Business Acquisitions (Tables)

9 Months Ended

Sep. 30, 2020

Business Acquisition [Line Items]

Summary of Elements of Purchase Price of Acquisitions

The following table summarizes the elements of purchase price of the acquisitions completed during the nine months ended September 30, 2020:

	Cash		Common Stock		Other Purchase Price Component Current			Other Purchase Price Component Long Term		Contingent Consideration Current		Contingent Consideration Long Term		Total Purchase Price
CTEH	$	175,000	$	25,000	$	(2,297	)	$	—	$	34,451	$	10,543	$	242,697
All other acquisitions		450		—		50			100		210		—		810
	$	175,450	$	25,000	$	(2,247	)	$	100	$	34,661	$	10,543	$	243,507

The following table summarizes the elements of purchase price of the acquisitions completed during the nine months ended September 30, 2019:

	Cash		Common Stock		Other Purchase Price Components			Contingent Consideration		Total Purchase Price
Golden	$	1,500		—		—		$	477	$	1,977
TES		2,359		322		25			4,911		7,617
TESUS		18,683		3,041		1,495			—		23,219
AWS		6,020		—		150			—		6,170
AEC		808		—		—			—		808
LEHDER		3,878		684		—			13		4,575
ECT2		54,037		—		(220	)		—		53,817
	$	87,285	$	4,047	$	1,450		$	5,401	$	98,183

Summary of Purchase Price Attributable to Acquisitions

The purchase price attributable to the acquisitions was allocated as follows:

	ECT2		All Other Acquisitions		Total
Cash	$	3,149	$	2,137	$	5,286
Restricted cash		629		—		629
Accounts receivable		1,707		3,751		5,458
Other current assets		498		61		559
Current assets		5,983		5,949		11,932
Property and equipment		776		3,288		4,064
Customer relationships		13,840		12,748		26,588
Trade names		1,008		659		1,667
Covenants not to compete		3,360		2,083		5,443
Proprietary software		—		2,560		2,560
Patent		17,479		—		17,479
Goodwill		16,395		20,227		36,622
Total assets		58,841		47,514		106,355
Current liabilities		5,024		977		6,001
Non- current liabilities		—		2,171		2,171
Total liabilities		5,024		3,148		8,172
Purchase price	$	53,817	$	44,366	$	98,183

Summary of Supplemental Unaudited Pro-Forma Information

The unaudited condensed consolidated financial information summarized in the following table gives effect to the 2020 and the 2019 acquisitions discussed above assuming they occurred on January 1, 2019. These unaudited consolidated pro forma operating results do not assume any impact from revenue, cost or other operating synergies that are expected or may have been realized as a result of the acquisitions. These unaudited consolidated pro forma operating results are presented for illustrative purposes only and are not indicative of the operating results that would have been achieved had the acquisitions occurred on January 1, 2019, nor does the information purport to reflect results for any future period.

	For the Three Months Ended September 30,
	2020								2019
	As reported			Acquisitions Pro-Forma (Unaudited)		Consolidated Pro-Forma (Unaudited)			As reported			Acquisitions Pro-Forma (Unaudited)		Consolidated Pro-Forma (Unaudited)
Revenues	$	84,705		$	—	$	84,705		$	57,623		$	18,551	$	76,174
Net (loss) income		(30,737	)		—		(30,737	)		(6,683	)		4,042		(2,641	)

	For the Nine Months Ended September 30,
	2020								2019
	As reported			Acquisitions Pro-Forma (Unaudited)		Consolidated Pro-Forma (Unaudited)			As reported			Acquisitions Pro-Forma (Unaudited)		Consolidated Pro-Forma (Unaudited)
Revenues	$	219,502		$	31,253	$	250,755		$	165,978		$	107,459	$	273,437
Net (loss) income		(58,761	)		10,288		(48,473	)		(12,247	)		30,002		17,755

CTEH

Business Acquisition [Line Items]

Summary of Purchase Price Attributable to Acquisitions

The preliminary purchase price attributable to the acquisitions was allocated as follows:

	CTEH		All Other Acquisitions		Total
Cash	$	1,527	$	—	$	1,527
Accounts receivable		17,059		—		17,059
Other current assets		1,265		—		1,265
Current assets		19,851		—		19,851
Property and equipment		7,042		75		7,117
Customer relationships		56,000		—		56,000
Trade names		4,200		—		4,200
Covenants not to compete		4,000		109		4,109
Proprietary software		14,700		—		14,700
Goodwill		146,625		626		147,251
Total assets		252,418		810		253,228
Current liabilities		9,721		—		9,721
Total liabilities		9,721		—		9,721
Purchase price	$	242,697	$	810	$	243,507

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Goodwill and Intangible Assets (Tables)

9 Months Ended

Sep. 30, 2020

Goodwill And Intangible Assets Disclosure [Abstract]

Schedule of Amounts Related to Goodwill

Amounts related to goodwill as of September 30, 2020 and December 31, 2019 are as follows:

	Assessment, Permitting and Response		Measurement and Analysis		Remediation and Reuse		Total
Balance as of December 31, 2019	$	15,173	$	68,628	$	43,257	$	127,058
Goodwill acquired during the period		146,625		426		200		147,251
Balance as of September 30, 2020	$	161,798	$	69,054	$	43,457	$	274,309

Schedule of Amounts Related to Finite-Lived Intangible Assets

Amounts related to finite-lived intangible assets as of September 30, 2020 and December 31, 2019 are as follows:

September 30, 2020	Estimated Useful Life	Gross Balance		Accumulated Amortization		Total Intangible Assets—Net
Finite lived intangible assets
Customer relationships	7–15 years	$	164,782	$	49,068	$	115,714
Covenants not to compete	4–5 years		29,942		20,444		9,498
Trade names	1–5 years		16,938		12,196		4,742
Proprietary software	3-5 years		20,808		4,915		15,893
Patent	16 years		17,479		1,125		16,354
Total other intangible assets—net		$	249,949	$	87,748	$	162,201

December 31, 2019	Estimated Useful Life	Gross Balance		Accumulated Amortization		Total Intangible Assets—Net
Finite lived intangible assets
Customer relationships	7–10 years	$	108,782	$	36,700	$	72,082
Covenants not to compete	4–5 years		25,832		17,572		8,260
Trade names	1–5 years		12,738		10,230		2,508
Proprietary software	3 years		3,885		1,359		2,526
Patent	16 years		17,479		306		17,173
Total other intangible assets—net		$	168,716	$	66,167	$	102,549

Schedule of Future Amortization Expense

Future amortization expense is estimated to be as follows for each of the five following years and thereafter:

December 31,
2020 (remaining)	$	7,543
2021		28,140
2022		24,053
2023		20,073
2024		16,951
Thereafter		65,441
	$	162,201

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Accounts Payable and Other Accrued Liabilities (Tables)

9 Months Ended

Sep. 30, 2020

Payables And Accruals [Abstract]

Summary of Accounts Payable and Other Accrued Liabilities

Accounts payable and other accrued liabilities consisted of the following as of September 30, 2020 and December 31, 2019:

	September 30,		December 31,
	2020		2019
Accounts payable	$	13,360	$	15,034
Accrued expenses		10,395		10,733
Other purchase obligations		572		—
Contract liabilities		9,335		3,314
Other current liabilities		235		504
Total accounts payable and other accrued liabilities	$	33,897	$	29,585

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Accrued Payroll and Benefits (Tables)

9 Months Ended

Sep. 30, 2020

Statement Of Financial Position [Abstract]

Schedule of Accrued Payroll and Benefits

Accrued payroll and benefits consisted of the following as of September 30, 2020 and December 31, 2019:

	September 30,		December 31,
	2020		2019
Accrued bonuses	$	7,854	$	3,449
Accrued paid time off		2,157		2,154
Accrued payroll		5,536		4,470
Accrued other		2,410		959
Total accrued payroll and benefits	$	17,957	$	11,032

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Debt (Tables)

9 Months Ended

Sep. 30, 2020

Debt Disclosure [Abstract]

Schedule of Debt

Debt as of September 30, 2020 and December 31, 2019 consisted of the following:

	September 30,			December 31,
	2020			2019
Term Loan Facility	$	174,453		$	48,750
Revolving Line of Credit		—			97,590
Capital leases		3,127			3,765
Other leases		2			12
Equipment line of credit		3,214			3,124
Less deferred debt issuance costs		(4,345	)		(1,052	)
Total debt		176,451			152,189
Less current portion of long term debt		(5,034	)		(7,143	)
Long-term debt, less current portion	$	171,417		$	145,046

Schedule of Applicable Percentages

The applicable margin means a percentage per annum determined in accordance with the following table as of December 31, 2019:

Pricing Tier	Consolidated Leverage Ratio	Commitment Fee			Eurodollar Rate Loans and LIBOR Letter of Credit Fee			Daily Floating Rate Loans			Rate Loans
1	> 3.75 to 1.0		0.50	%		4.00	%		4.00	%		3.00	%
2	≤ 3.75 to 1.0 but > 3.00 to 1.0		0.50			3.50			3.50			2.50
3	≤ 3.00 to 1.0 but > 2.25 to 1.0		0.40			3.00			3.00			2.00
4	< 2.25 to 1.0		0.30			2.50			2.50			1.50

Schedule of Capital Leases Mature by 2025

All capital leases (including those purchased through the Company’s equipment line of credit) mature by 2025 as follows:

September 30,	Payments		Interest		Principal
2021	$	2,670	$	368	$	2,302
2022		2,178		265		1,913
2023		1,582		139		1,443
2024		667		32		635
2025		49		1		48
	$	7,146	$	805	$	6,341

Schedule of Aggregate Annual Maturities of Long-Term Debt

The following is a schedule of the aggregate annual maturities of long-term debt presented on the condensed consolidated statement of financial position, based on the terms of the credit facility, capital lease obligations and equipment line of credit as of September 30, 2020:

September 30,
2021	$	5,034
2022		6,839
2023		8,006
2024		7,198
2025		153,719
Total	$	180,796

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Fair Value of Financial Instruments (Tables)

9 Months Ended

Sep. 30, 2020

Fair Value Disclosures [Abstract]

Summary of Financial Liabilities Measured at Fair Value on Recurring Basis

As of September 30, 2020 and December 31, 2019, the following financial liabilities are measured at fair value on a recurring basis using significant unobservable inputs (Level 3).

	September 30,		December 31,
	2020		2019
Business acquisitions contingent consideration, current	$	49,170	$	8,614
Business acquisitions contingent consideration, long-term		9,742		379
Contingent put option		—		7,100
Warrant option		—		16,878
Conversion option		18,059		—
Total	$	76,971	$	32,971

Summary of Financial Instruments Measured at Fair Value on Recurring Basis

The following table sets forth the Company’s financial instruments that were measured at fair value on a recurring basis for the nine months ended September 30, 2020 and September 30, 2019:

	Level 3
	Embedded Option			Business Acquisitions Contingent Consideration, Current(1)			Business Acquisitions Contingent Consideration, Long-term(2)			Contingent Put Option			Warrant Options			Total
Balance—at December 31, 2018	$	—		$	2,754		$	—		$	—		$	12,818		$	15,572
Acquisitions					31			—			—			—			31
Changes in fair value included in earnings		—			(670	)		—			—			4,059			3,389
Payment of contingent consideration         payable		—			(554	)		—			—			—			(554	)
Balance—at September 30, 2019	$	—		$	1,561		$	—		$	—		$	16,877		$	18,438
Balance—at December 31, 2019	$	—		$	8,614		$	379		$	7,100		$	16,878		$	32,971
Foreign currency translation of contingent        consideration payment		—			(208	)		—			—			—			(208	)
Payment of contingent consideration        payable		—			(12,464	)		—			—			—			(12,464	)
Acquisitions					34,661			10,543									45,204
Series A-2 compound embedded option		(9,361	)		—			—			—			—			(9,361	)
Issuance of warrant option		—			—			—			—			30,097			30,097
Reclass of long term to short term contingent       liabilities		—			180			(180	)		—			—			—
Changes in fair value included in earnings		27,420			18,387			(1,000	)		(19,240	)		9,312			34,879
Write off of the contingent put option		—			—			—			12,140			—			12,140
Exercise of warrant options		—			—			—			—			(56,287	)		(56,287	)
Balance—at September 30, 2020	$	18,059		$	49,170		$	9,742		$	—		$	—		$	76,971

(1) Current portion of the contingent consideration is recorded in business acquisitions contingent consideration, current.

(2) Long term portion of the contingent consideration is recorded in business acquisitions contingent consideration, long-term.

Summary of Fair Value of Warrant Options Associated with Issuance of Redeemable Preferred Stock

The fair value of the warrant options associated with the issuance of the Redeemable Series A-1 Preferred Stock and the Convertible and Redeemable Series A-2 Preferred Stock was calculated based on the Black-Sholes pricing model using the following assumptions:

	July 30,			September 30,
Series A-1 Preferred Stock Warrant Option	2020			2019
Common stock value (per share)	$	22.22		$	31.60
Expected volatility		44.35	%		47.63	%
Risk-free interest rate		0.55	%		1.68	%
Expected life (years)		10			10
	July 30,			September 30,
Series A-2 Preferred Stock Warrant Option	2020			2019
Common stock value (per share)	$	22.22		n/a
Expected volatility		44.35	%	n/a
Risk-free interest rate		0.55	%	n/a
Expected life (years)		10		n/a

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Commitments and Contingencies (Tables)

9 Months Ended

Sep. 30, 2020

Commitments And Contingencies Disclosure [Abstract]

Schedule of Future Minimum Lease Payments under Leases

The following is a schedule of the future minimum lease payments by year under the leases as of September 30, 2020:

September 30,	Rent		Office Equipment		Total
2021	$	5,863	$	332	$	6,195
2022		4,865		327		5,192
2023		2,961		129		3,090
2024		1,410		39		1,449
2025 and thereafter		1,385		1		1,386
	$	16,484	$	828	$	17,312

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Stockholder's Equity (Deficit) (Tables)

9 Months Ended

Sep. 30, 2020

Summary of Issued and Cancelled Shares of Common Stock

During the three and nine months ended September 30, 2020 and September 30, 2019, the Company issued and cancelled the following shares of common stock:

	Three Months Ended September 30,									Nine Months Ended September 30,
	2020					2019				2020					2019
	Shares			Average Price per Share		Shares		Average Price per Share		Shares			Average Price per Share		Shares		Average Price per Share
Common stock issued    in connection with initial public    offering		11,500,000		$	15.00		—	$	—		11,500,000		$	15.00		—	$	—
Acquisitions		—			—		25,408		26.90		791,139			31.60		150,439		22.41
Redemption of series A-1 preferred stock		1,786,739			15.00		—		—		1,786,739			15.00		—		—
Exercise of warrant options		2,534,239			0.01		—		—		2,534,239			0.01		—		—
Exercise of options		16,850			8.92		7,150		6.03		20,350			9.27		22,675		18.01
Restricted shares, net		8,333			24.00		—		—		8,333			24.00		—		—
Cancellation of shares		(117,785	)		17.15		—		—		(117,785	)		17.15		—		—
		15,728,376		$	12.82		32,558	$	22.32		16,523,015		$	13.72		173,114	$	21.83

Schedule of Share Authorized to be Issue and Available for Grant

The following number of shares were authorized to be issued and available for grant as of September 30, 2020 and September 30, 2019:

	September 30, 2020
	2017 Plan		2013 Plan
Shares authorized to be issued		2,945,443		2,047,269
Shares available for grant		1,233,266		—
	September 30, 2019
	2017 Plan		2013 Plan
Shares authorized to be issued		981,800		2,074,604
Shares available for grant		159,428		—

Schedule of Stock Compensation Expense

Total stock compensation expense for the Plans was as follows:

	Three Months Ended September 30,
	2020									2019
	2017 plan				2013 plan					2017 plan				2013 plan
	Options		Restricted Stock		Options			Total		Options		Restricted Stock		Options		Total
Cost of revenue	$	276	$	—	$	(5	)	$	271	$	278	$	—	$	97	$	375
Selling, general and administrative expense		592		233		53			878		185		111		384		680
	$	868	$	233	$	48		$	1,149	$	463	$	111	$	481	$	1,055

	Nine Months Ended September 30,
	2020								2019
	2017 plan				2013 plan				2017 plan				2013 plan
	Options		Restricted Stock		Options		Total		Options		Restricted Stock		Options		Total
Cost of revenue	$	973	$	—	$	126	$	1,099	$	623	$	—	$	390	$	1,013
Selling, general and administrative expense		1,178		973		189		2,340		457		323		1,784		2,564
	$	2,151	$	973	$	315	$	3,439	$	1,080	$	323	$	2,174	$	3,577

Summary of Weighted Average Assumptions Used in Black-Sholes Option-pricing Model

The following weighted-average assumptions were used in the Black-Sholes option-pricing model calculation for the nine months ended September 30, 2020 and September 30, 2019:

	September 30,		September 30,
	2020		2019
Common stock value (per share)	$	16.36	$	27.30
Expected volatility		46.14		47.94
Risk-free interest rate		0.41		2.15
Expected life (years)		7		7
Forfeiture rate	None		None
Dividend rate	None		None

Schedule of Common Stock Reserved for Future Issuance

Common Stock Reserved for Future Issuances—At September 30, 2020 and September 30, 2019, the Company has reserved certain stock of its authorized but unissued common stock for possible future issuance in connection with the following:

	September 30,		December 31,
	2020		2019
Warrants		116,350		650,590
Montrose 2013 Stock Incentive Plan		2,047,269		2,058,619
Montrose 2017 Stock Incentive Plan		2,945,443		997,785
Common stock reserved for future issuance		5,109,062		3,706,994

Montrose Amended & Restated 2017 Stock Incentive Plan

Summary of Stock Option Activity

The following summarizes the options activity of the 2017 Plan for the nine months ended September 30, 2020 and September 30, 2019:

	Options to Purchase Common Stock			Weighted- Average Exercise Price per Share		Weighted Average Grant Date Fair Value per Share		Weighted Average Remaining Contract Life (in Years)		Aggregate Intrinsic Value of In-The- Money Options (in Thousands)
Outstanding at December 31, 2018		257,762		$	20	$	10		-	$	1,151
Granted		356,470			27		14		-		—
Forfeited/ cancelled		(17,700	)		19		—		-		—
Outstanding at September 30, 2019		596,532			24		12		8.07		4,693
Outstanding at December 31, 2019		617,852			24		12		7.82		4,693
Granted		851,877			32		12		-		—
Forfeited/ cancelled		(14,375	)		22		—		-		—
Exercised		(925	)		14		—		-		7,918
Outstanding at September 30, 2020		1,454,429			21		12		7.59		7,649
Exercised at September 30, 2020		925			14		—		7.33		7,649
Options vested and expected to vest		1,454,429			21				9.04		7,649

Montrose Amended and Restated 2013 Stock Option Plan

Summary of Stock Option Activity

Montrose Amended & Restated 2013 Stock Option Plan—The following summarizes the activity of the 2013 Plan for the nine months ended September 30, 2020 and September 30, 2019:

	Options to Purchase Common Stock			Weighted- Average Exercise Price per Share		Weighted Average Grant Date Fair Value per Share		Weighted Average Remaining Contract Life (in Years)		Aggregate Intrinsic Value of In-The- Money Options (in Thousands)
Outstanding at December 31, 2018		1,900,404		$	6	$	1		7.30		33,290
Forfeited/ cancelled		(14,500	)		8		—		-		—
Expired		(5,400	)		8		—		-		—
Exercised		(19,010	)		6		—		-		466
Outstanding at September 30, 2019		1,861,494			6		1		6.65		47,381
Outstanding at December 31, 2019		1,855,469			6		1		6.40		46,617
Forfeited/ cancelled		(7,500	)		10		—		-		—
Expired		(11,300	)		6		—		-		—
Exercised		(19,175	)		8		—		-		354
Outstanding at September 30, 2020		1,817,494			6		1		5.63		33,772
Exercised at September 30, 2020		221,025			6		—		5.14		33,772
Options vested and expected to vest		1,817,494			6		—		5.17		33,772

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Net Loss Per Share (Tables)

9 Months Ended

Sep. 30, 2020

Earnings Per Share [Abstract]

Computation of Basic and Diluted Net Loss Per Share Attributable to Common Stockholders

The following table summarizes the computation of basic and diluted net loss per share attributable to common stockholders of the Company for the three and nine months ended September 30, 2020 and September 30, 2019:

	Three Months Ended September 30,						Nine Months Ended September 30,
In thousands, except for net loss per share	2020			2019			2020			2019
Net loss	$	(30,737	)	$	(6,683	)	$	(58,761	)	$	(12,247	)
Accretion of redeemable series A-1 preferred stock		(6,542	)		(5,030	)		(17,601	)		(14,341	)
Redeemable series A-1 preferred stock deemed dividend		(24,341	)		—			(24,341	)		—
Convertible and redeemable series A-2 preferred stock dividend		(2,870	)		—			(2,870	)		—
Net loss attributable to common stockholders – basic    and diluted		(64,490	)		(11,713	)		(103,573	)		(26,588	)
Weighted-average common shares outstanding –    basic and diluted		21,554			8,718			13,669			8,640
Net loss per share attributable to common stockholders –    basic and diluted	$	(2.99	)	$	(1.34	)	$	(7.58	)	$	(3.08	)

Equity Shares Excluded from Calculation of Diluted Net Loss per Share Attributable to Common Stockholders

The following equity shares were excluded from the calculation of diluted net loss per share attributable to common stockholders because their effect would have been anti-dilutive for the three and nine months ended September 30, 2020 and September 30, 2019:

	September 30,
	2020		2019
Stock options		2,423,900		2,062,825
Restricted stock		176,384		158,426
Warrants		116,350		116,350

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Segment Information (Tables)

9 Months Ended

Sep. 30, 2020

Segment Reporting [Abstract]

Components of Segment Revenues and Adjusted EBITDA

Segment revenues and Adjusted EBITDA for the three and nine months ended September 30, 2020 and September 30, 2019 were as follows:

	Three Months Ended September 30,										Nine Months Ended September 30,
	2020					2019					2020					2019
			Segment					Segment					Segment					Segment
	Segment		Adjusted			Segment		Adjusted			Segment		Adjusted			Segment		Adjusted
	Revenues		EBITDA			Revenues		EBITDA			Revenues		EBITDA			Revenues		EBITDA
Assessment, Permitting and Response	$	26,593	$	8,230		$	5,413	$	1,695		$	49,768	$	14,665		$	15,017	$	5,693
Measurement and Analysis		39,770		11,226			35,672		7,691			113,130		30,422			98,521		19,761
Remediation and Reuse		18,342		2,012			16,538		2,400			56,604		6,495			52,440		7,317
Total Operating Segments		84,705		21,468			57,623		11,786			219,502		51,582			165,978		32,771
Corporate and Other		—		(4,762	)		—		(3,567	)		—		(15,425	)		—		(10,935	)
Total	$	84,705	$	16,706		$	57,623	$	8,219		$	219,502	$	36,157		$	165,978	$	21,836

Reconciliation of Segment Measure to Loss Before Benefit from Income Taxes

Presented below is a reconciliation of the Company’s segment measure to loss before benefit from income taxes for the three and nine months ended September 30, 2020 and September 30, 2019:

	For the Three Months Ended September 30,						For the Nine Months Ended September 30,
	2020			2019			2020			2019
Total	$	16,706		$	8,219		$	36,157		$	21,836
Interest expense, net		(3,043	)		(2,130	)		(10,896	)		(4,590	)
Income tax (expense) benefit		(3,348	)		412			1,563			1,308
Depreciation and amortization		(9,740	)		(7,412	)		(27,084	)		(20,262	)
Stock-based compensation		(1,149	)		(1,055	)		(3,439	)		(3,577	)
Start-up losses and investment in new services		(602	)		(634	)		(1,283	)		(1,091	)
Acquisition costs		(6	)		(1,278	)		(3,767	)		(2,350	)
Fair value changes in contingent put option		26,265			—			19,240			—
Fair value changes in warrant options		(9,311	)		(2,510	)		(9,312	)		(4,059	)
Fair value changes in compound embedded option		(26,664	)		—			(27,420	)		—
Fair value changes in business acquisitions contingent consideration		(13,404	)		(256	)		(17,387	)		670
Short term purchase accounting fair value adjustment    to deferred revenue		—			—			(243	)		—
IPO preparation costs and IPO related bonuses		(6,378	)		(20	)		(6,908	)		(105	)
Discontinued services (i)		(30	)		—			(7,526	)		—
Expenses related to financing transactions		—			—			(277	)		—
Other expenses		(33	)		(19	)		(179	)		(27	)
Net loss	$	(30,737	)	$	(6,683	)	$	(58,761	)	$	(12,247	)

(i)During the first quarter of 2020, the Company determined to reduce the footprint of its environmental lab in Berkeley, California, and to exit its non-specialized municipal water engineering service line and its food waste biogas engineering service line. As a part of discontinuing service lines, the Company made the decision to book an additional bad debt reserve related to the uncertainty around the ability to collect on receivables related to these service lines (Note 3). It was determined that the discontinuation of these service lines did not represent a strategic shift that had (or will have) a major effect on the Company’s operations and financial results therefore did not meet the requirements to be classified as discontinued operations.

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Description of the Business and Basis of Presentation - Additional Information (Details) $ / shares in Units, $ in Thousands		3 Months Ended	9 Months Ended
	Jul. 27, 2020 USD ($) $ / shares shares	Sep. 30, 2020 Employee $ / shares shares	Sep. 30, 2020 USD ($) Employee Office Acquisition $ / shares shares	Sep. 30, 2019 USD ($) $ / shares
Description Of Business And Basis Of Presentation [Line Items]
Entity formation, month and year			2013-11
Number of offices in which entity operates | Office			70
Entity number of employees | Employee		1,700	1,700
Number of acquisitions completed | Acquisition			56
Common stock shares sold under IPO | shares	1,786,739
Share price | $ / shares		$ 16.36	$ 16.36	$ 27.30
Net proceeds from sale of common stock			$ 171	$ 139
IPO
Description Of Business And Basis Of Presentation [Line Items]
Common stock shares sold under IPO | shares	11,500,000	11,500,000	11,500,000
Share price | $ / shares	$ 15.00
Net proceeds from sale of common stock	$ 161,300
Underwriting discounts	11,200
Deferred IPO costs againts additional paid in capital	$ 4,400
Underwriters
Description Of Business And Basis Of Presentation [Line Items]
Common stock shares sold under IPO | shares	1,500,000

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Summary of New Accounting Pronouncements - Additional Information (Details)	Sep. 30, 2020
Accounting Standards Update 2018-07
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Change in accounting principle, accounting standards update, adopted	true
Change in accounting principle, accounting standards update, adoption date	Jan. 01, 2020
Change in accounting principle, accounting standards update, immaterial effect	true
Accounting Standards Update 2017-04
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Change in accounting principle, accounting standards update, adopted	true
Change in accounting principle, accounting standards update, adoption date	Jan. 01, 2020
Change in accounting principle, accounting standards update, immaterial effect	true

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Revenues and Accounts Receivable - Schedule of Contract Balances (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Revenues And Accounts Receivable [Abstract]
Contract assets	$ 35,441	$ 13,605
Contract liabilities	$ 9,335	$ 3,314

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Revenues and Accounts Receivable - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2020	Mar. 31, 2020	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Accounts Notes And Loans Receivable [Line Items]
Contracts assets acquired through business acquisitions			$ 6,500		$ 700
Contract liabilities acquired through business acquisitions			0		2,200
Contract with customer liabilities, revenue recognized	$ 500		2,100
Revenue remaining performance obligations	$ 25,200		25,200		13,000
Provision for bad debt		$ 6,300	6,445	$ 590	$ 1,246
Remediation and Reuse Segment
Accounts Notes And Loans Receivable [Line Items]
Provision for bad debt			$ 5,500
Customer Concentration Risk | Accounts Receivable | Minimum
Accounts Notes And Loans Receivable [Line Items]
Concentration Risk Percentage			10.00%

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Revenues and Accounts Receivable - Additional Information (Details1) - USD ($) $ in Millions	Sep. 30, 2020	Dec. 31, 2019
Revenue Remaining Performance Obligation Expected Timing Of Satisfaction [Line Items]
Revenue remaining performance obligations	$ 25.2	$ 13.0
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2020-10-01
Revenue Remaining Performance Obligation Expected Timing Of Satisfaction [Line Items]
Revenue remaining performance obligations	$ 24.0
Revenue remaining performance obligations, satisfaction period	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2021-01-01
Revenue Remaining Performance Obligation Expected Timing Of Satisfaction [Line Items]
Revenue remaining performance obligations	$ 1.2
Revenue remaining performance obligations, satisfaction period

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Revenues and Accounts Receivable - Schedule of Accounts Receivable, Net (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019	Dec. 31, 2018
Revenues And Accounts Receivable [Abstract]
Accounts receivable, invoiced	$ 52,372	$ 46,643
Accounts receivable, other	929	611
Allowance for doubtful accounts	(8,516)	(1,327)	$ (453)
Accounts receivable—net	$ 44,785	$ 45,927

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Revenues and Accounts Receivable - Schedule of Allowance for Doubtful Accounts (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended		12 Months Ended
	Mar. 31, 2020	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Revenues And Accounts Receivable [Abstract]
Beginning Balance	$ 1,327	$ 1,327	$ 453	$ 453
Bad Debt Expense	$ 6,300	6,445	$ 590	1,246
Charged to Allowance		(294)		(556)
Other		1,038		184
Ending Balance		$ 8,516		$ 1,327

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Prepaid and Other Current Assets - Schedule of Prepaid and Other Current Assets (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Prepaid Expense and Other Assets, Current [Abstract]
Deposits	$ 733	$ 605
Prepaid expenses	1,665	1,235
Prepaid insurance	2,577	170
Supplies	2,428	2,368
Offering costs		1,240
Income tax receivable	1,182	1,205
Prepaid and other current assets	$ 8,585	$ 6,823

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Property and Equipment - Property and Equipment, Net (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2020	Dec. 31, 2019
Property Plant And Equipment [Line Items]
Property and equipment, gross	$ 75,584	$ 62,878
Less accumulated depreciation	(41,906)	(36,638)
Total property and equipment—net	$ 34,559	27,036
Lab and Test Equipment
Property Plant And Equipment [Line Items]
Estimated Useful Life	7 years
Property and equipment, gross	$ 17,755	14,810
Vehicles
Property Plant And Equipment [Line Items]
Estimated Useful Life	5 years
Property and equipment, gross	$ 12,869	11,073
Equipment
Property Plant And Equipment [Line Items]
Property and equipment, gross	$ 31,539	29,922
Equipment | Minimum
Property Plant And Equipment [Line Items]
Estimated Useful Life	3 years
Equipment | Maximum [Member]
Property Plant And Equipment [Line Items]
Estimated Useful Life	7 years
Furniture and Fixtures
Property Plant And Equipment [Line Items]
Estimated Useful Life	7 years
Property and equipment, gross	$ 2,854	1,119
Leasehold Improvements
Property Plant And Equipment [Line Items]
Estimated Useful Life	7 years
Property and equipment, gross	$ 6,758	5,954
Aircraft
Property Plant And Equipment [Line Items]
Estimated Useful Life	10 years
Property and equipment, gross	$ 834
Building
Property Plant And Equipment [Line Items]
Estimated Useful Life	39 years
Property and equipment, gross	$ 2,975
Land
Property Plant And Equipment [Line Items]
Property and equipment, gross	725
Construction in Progress
Property Plant And Equipment [Line Items]
Property and equipment, gross	$ 156	$ 796

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Property and Equipment - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Property Plant And Equipment [Abstract]
Depreciation expense	$ 2.1	$ 2.1	$ 6.1	$ 5.9

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Business Acquisitions - Additional Information (Details) - USD ($)	1 Months Ended	3 Months Ended		9 Months Ended
	Apr. 30, 2020	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Aug. 31, 2019	Jul. 31, 2019	Jun. 30, 2019	Apr. 30, 2019	Mar. 31, 2019
Business Acquisition [Line Items]
Transaction costs related to business combinations		$ 6,000	$ 1,278,000	$ 3,767,000	$ 2,350,000
Number of common stock shares issued in connection with business acquisition			25,408	791,139	150,439
Revenue			$ 7,700,000		$ 7,700,000
Pre-tax income (loss)			$ 1,500,000		$ 1,500,000
Customer Relationships
Business Acquisition [Line Items]
Weighted average useful lives for acquired intangible assets					9 years 6 months
Trade Names
Business Acquisition [Line Items]
Weighted average useful lives for acquired intangible assets					1 year 6 months
Covenants Not to Compete
Business Acquisition [Line Items]
Weighted average useful lives for acquired intangible assets					4 years
Proprietary Software
Business Acquisition [Line Items]
Weighted average useful lives for acquired intangible assets					3 years
Patent
Business Acquisition [Line Items]
Weighted average useful lives for acquired intangible assets					16 years
CTEH
Business Acquisition [Line Items]
Percentage of interests acquired	100.00%
Revenue		37,200,000		$ 37,200,000
Pre-tax income (loss)		$ 5,700,000		$ 5,700,000
CTEH | External Proprietary Software
Business Acquisition [Line Items]
Weighted average useful lives for acquired intangible assets	5 years
CTEH | Customer Relationships
Business Acquisition [Line Items]
Weighted average useful lives for acquired intangible assets	15 years
CTEH | Trade Names
Business Acquisition [Line Items]
Weighted average useful lives for acquired intangible assets	5 years
CTEH | Covenants Not to Compete
Business Acquisition [Line Items]
Weighted average useful lives for acquired intangible assets	5 years
CTEH | Proprietary Software
Business Acquisition [Line Items]
Weighted average useful lives for acquired intangible assets	3 years
CTEH | Covenants Not to Compete Other Acquisitions
Business Acquisition [Line Items]
Weighted average useful lives for acquired intangible assets	4 years
CTEH | 2020 Earn Out
Business Acquisition [Line Items]
Business combination, contingent consideration arrangements, basis for amount				CTEH first year earnout is to be calculated at twelve times CTEH’s 2020 EBITDA (as defined in the purchase agreement) in excess of $18.3 million, with a maximum first year earn-out payment of $50.0 million.
Business combination, contingent consideration arrangements, description				The 2020 earn out was initially payable 100% in common stock, but as a result of the completion of the Company’s IPO (Note 1), 50% of any 2020 earnout payment will be payable in cash and 50% will be payable, at the Company’s election, in cash or shares of common stock.
Business combination, minimum EBITDA for contingent consideration arrangements	$ 18,300,000
Business combination, earn-out payment, maximum	$ 50,000,000
Percentage of earn out payable in common stock	100.00%
Percentage of earn out payable in cash, as result of completing of IPO	50.00%
Percentage of earn out payable in cash or shares, as a result of completion of IPO, at company's election	50.00%
CTEH | 2021 Earn Out
Business Acquisition [Line Items]
Business combination, contingent consideration arrangements, basis for amount				The second year earn-out is to be calculated at ten times CTEH’s 2021 EBITDA in excess of actual 2020 EBITDA (with actual 2020 EBITDA subject to a minimum of $18.3 million and a maximum of $22.5 million), with a maximum second year earn-out payment of $30.0 million.
Business combination, contingent consideration arrangements, description				The 2021 earn out, if any, is payable 100% in cash.
Business combination, earn-out payment, maximum	$ 30,000,000
Percentage of earn out payable in cash	100.00%
CTEH | Minimum | 2020 Earn Out
Business Acquisition [Line Items]
Business combination, actual EBITDA	$ 18,300,000
CTEH | Maximum [Member] | 2020 Earn Out
Business Acquisition [Line Items]
Business combination, actual EBITDA	$ 22,500,000
CTEH | Convertible And Redeemable Series A-2 Preferred Stock
Business Acquisition [Line Items]
Number of common stock shares issued in connection with business acquisition					791,139
Golden
Business Acquisition [Line Items]
Percentage of interests acquired										100.00%
TES
Business Acquisition [Line Items]
Percentage of interests acquired									100.00%
TESUS
Business Acquisition [Line Items]
Percentage of interests acquired									100.00%
AWS
Business Acquisition [Line Items]
Percentage of interests acquired								100.00%
LEHDER
Business Acquisition [Line Items]
Percentage of interests acquired							100.00%
ECT2
Business Acquisition [Line Items]
Percentage of interests acquired						100.00%

XML

Business Acquisitions - Summary of Elements of Purchase Price of Acquisitions (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019
Business Acquisition [Line Items]
Cash	$ 175,450	$ 87,285
Common Stock	25,000	4,047
Other Purchase Price Component Current	(2,247)
Other Purchase Price Component Long Term	100
Contingent Consideration Current	34,661
Contingent Consideration Long Term	10,543
Other Purchase Price Components		1,450
Contingent Consideration		5,401
Total Purchase Price	243,507	98,183
CTEH
Business Acquisition [Line Items]
Cash	175,000
Common Stock	25,000
Other Purchase Price Component Current	(2,297)
Contingent Consideration Current	34,451
Contingent Consideration Long Term	10,543
Total Purchase Price	242,697
All Other Acquisitions
Business Acquisition [Line Items]
Cash	450
Other Purchase Price Component Current	50
Other Purchase Price Component Long Term	100
Contingent Consideration Current	210
Total Purchase Price	$ 810
Golden
Business Acquisition [Line Items]
Cash		1,500
Contingent Consideration		477
Total Purchase Price		1,977
TES
Business Acquisition [Line Items]
Cash		2,359
Common Stock		322
Other Purchase Price Components		25
Contingent Consideration		4,911
Total Purchase Price		7,617
TESUS
Business Acquisition [Line Items]
Cash		18,683
Common Stock		3,041
Other Purchase Price Components		1,495
Total Purchase Price		23,219
AWS
Business Acquisition [Line Items]
Cash		6,020
Other Purchase Price Components		150
Total Purchase Price		6,170
AEC
Business Acquisition [Line Items]
Cash		808
Total Purchase Price		808
LEHDER
Business Acquisition [Line Items]
Cash		3,878
Common Stock		684
Contingent Consideration		13
Total Purchase Price		4,575
ECT2
Business Acquisition [Line Items]
Cash		54,037
Other Purchase Price Components		(220)
Total Purchase Price		$ 53,817

XML

Business Acquisitions - Summary of Purchase Price Attributable to Acquisitions (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Sep. 30, 2019
Business Acquisition [Line Items]
Cash	$ 1,527	$ 5,286
Restricted cash		629
Accounts receivable	17,059	5,458
Other current assets	1,265	559
Current assets	19,851	11,932
Property and equipment	7,117	4,064
Goodwill	147,251	36,622
Total assets	253,228	106,355
Current liabilities	9,721	6,001
Total liabilities	9,721	8,172
Purchase price	243,507	98,183
Non- current liabilities		2,171
Customer Relationships
Business Acquisition [Line Items]
Intangible assets	56,000	26,588
Trade Names
Business Acquisition [Line Items]
Intangible assets	4,200	1,667
Covenants Not to Compete
Business Acquisition [Line Items]
Intangible assets	4,109	5,443
Proprietary Software
Business Acquisition [Line Items]
Intangible assets	14,700	2,560
Patent
Business Acquisition [Line Items]
Intangible assets		17,479
CTEH
Business Acquisition [Line Items]
Cash	1,527
Accounts receivable	17,059
Other current assets	1,265
Current assets	19,851
Property and equipment	7,042
Goodwill	146,625
Total assets	252,418
Current liabilities	9,721
Total liabilities	9,721
Purchase price	242,697
CTEH | Customer Relationships
Business Acquisition [Line Items]
Intangible assets	56,000
CTEH | Trade Names
Business Acquisition [Line Items]
Intangible assets	4,200
CTEH | Covenants Not to Compete
Business Acquisition [Line Items]
Intangible assets	4,000
CTEH | Proprietary Software
Business Acquisition [Line Items]
Intangible assets	14,700
All Other Acquisitions
Business Acquisition [Line Items]
Property and equipment	75
Goodwill	626
Total assets	810
Purchase price	810
All Other Acquisitions | Covenants Not to Compete
Business Acquisition [Line Items]
Intangible assets	$ 109
ECT2
Business Acquisition [Line Items]
Cash		3,149
Restricted cash		629
Accounts receivable		1,707
Other current assets		498
Current assets		5,983
Property and equipment		776
Goodwill		16,395
Total assets		58,841
Current liabilities		5,024
Total liabilities		5,024
Purchase price		53,817
ECT2 | Customer Relationships
Business Acquisition [Line Items]
Intangible assets		13,840
ECT2 | Trade Names
Business Acquisition [Line Items]
Intangible assets		1,008
ECT2 | Covenants Not to Compete
Business Acquisition [Line Items]
Intangible assets		3,360
ECT2 | Patent
Business Acquisition [Line Items]
Intangible assets		17,479
All Other Acquisitions
Business Acquisition [Line Items]
Cash		2,137
Accounts receivable		3,751
Other current assets		61
Current assets		5,949
Property and equipment		3,288
Goodwill		20,227
Total assets		47,514
Current liabilities		977
Total liabilities		3,148
Purchase price		44,366
Non- current liabilities		2,171
All Other Acquisitions | Customer Relationships
Business Acquisition [Line Items]
Intangible assets		12,748
All Other Acquisitions | Trade Names
Business Acquisition [Line Items]
Intangible assets		659
All Other Acquisitions | Covenants Not to Compete
Business Acquisition [Line Items]
Intangible assets		2,083
All Other Acquisitions | Proprietary Software
Business Acquisition [Line Items]
Intangible assets		$ 2,560

XML

Business Acquisitions - Summary of Supplemental Unaudited Pro-Forma Information (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Business Acquisition [Line Items]
Revenues	$ 84,705	$ 57,623	$ 219,502	$ 165,978
Net (loss) income	(30,737)	(6,683)	(58,761)	(12,247)
Acquisition Proforma
Business Acquisition [Line Items]
Revenues		18,551	31,253	107,459
Net (loss) income		4,042	10,288	30,002
Consolidated Proforma
Business Acquisition [Line Items]
Revenues	84,705	76,174	250,755	273,437
Net (loss) income	$ (30,737)	$ (2,641)	$ (48,473)	$ 17,755

XML

Goodwill and Intangible Assets - Schedule of Amounts Related to Goodwill (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2020 USD ($)
Goodwill [Line Items]
Balance	$ 127,058
Goodwill acquired during the period	147,251
Balance	274,309
Assessment, Permitting and Response
Goodwill [Line Items]
Balance	15,173
Goodwill acquired during the period	146,625
Balance	161,798
Measurement and Analysis
Goodwill [Line Items]
Balance	68,628
Goodwill acquired during the period	426
Balance	69,054
Remediation and Reuse Segment
Goodwill [Line Items]
Balance	43,257
Goodwill acquired during the period	200
Balance	$ 43,457

XML

Goodwill and Intangible Assets - Schedule of Amounts Related to Finite-Lived Intangible Assets (Details) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2020	Dec. 31, 2019
Finite Lived Intangible Assets [Line Items]
Gross Balance	$ 249,949	$ 168,716
Accumulated Amortization	87,748	66,167
Total Intangible Assets—Net	162,201	102,549
Customer Relationships
Finite Lived Intangible Assets [Line Items]
Gross Balance	164,782	108,782
Accumulated Amortization	49,068	36,700
Total Intangible Assets—Net	$ 115,714	$ 72,082
Customer Relationships | Minimum
Finite Lived Intangible Assets [Line Items]
Estimated Useful Life	7 years	7 years
Customer Relationships | Maximum [Member]
Finite Lived Intangible Assets [Line Items]
Estimated Useful Life	15 years	10 years
Covenants Not to Compete
Finite Lived Intangible Assets [Line Items]
Gross Balance	$ 29,942	$ 25,832
Accumulated Amortization	20,444	17,572
Total Intangible Assets—Net	$ 9,498	$ 8,260
Covenants Not to Compete | Minimum
Finite Lived Intangible Assets [Line Items]
Estimated Useful Life	4 years	4 years
Covenants Not to Compete | Maximum [Member]
Finite Lived Intangible Assets [Line Items]
Estimated Useful Life	5 years	5 years
Trade Names
Finite Lived Intangible Assets [Line Items]
Gross Balance	$ 16,938	$ 12,738
Accumulated Amortization	12,196	10,230
Total Intangible Assets—Net	$ 4,742	$ 2,508
Trade Names | Minimum
Finite Lived Intangible Assets [Line Items]
Estimated Useful Life	1 year	1 year
Trade Names | Maximum [Member]
Finite Lived Intangible Assets [Line Items]
Estimated Useful Life	5 years	5 years
Proprietary Software
Finite Lived Intangible Assets [Line Items]
Estimated Useful Life		3 years
Gross Balance	$ 20,808	$ 3,885
Accumulated Amortization	4,915	1,359
Total Intangible Assets—Net	$ 15,893	$ 2,526
Proprietary Software | Minimum
Finite Lived Intangible Assets [Line Items]
Estimated Useful Life	3 years
Proprietary Software | Maximum [Member]
Finite Lived Intangible Assets [Line Items]
Estimated Useful Life	5 years
Patent
Finite Lived Intangible Assets [Line Items]
Estimated Useful Life	16 years	16 years
Gross Balance	$ 17,479	$ 17,479
Accumulated Amortization	1,125	306
Total Intangible Assets—Net	$ 16,354	$ 17,173

XML

Goodwill and Intangible Assets - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Goodwill And Intangible Assets Disclosure [Abstract]
Amortization expense	$ 7.6	$ 5.3	$ 21.0	$ 14.4

XML

Goodwill and Intangible Assets - Schedule of Future Amortization Expense (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Goodwill And Intangible Assets Disclosure [Abstract]
2020 (remaining)	$ 7,543
2021	28,140
2022	24,053
2023	20,073
2024	16,951
Thereafter	65,441
Total Intangible Assets—Net	$ 162,201	$ 102,549

XML

Accounts Payable and Other Accrued Liabilities - Summary of Accounts Payable and Other Accrued Liabilities (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Payables And Accruals [Abstract]
Accounts payable	$ 13,360	$ 15,034
Accrued expenses	10,395	10,733
Other purchase obligations	572
Contract liabilities	9,335	3,314
Other current liabilities	235	504
Total accounts payable and other accrued liabilities	$ 33,897	$ 29,585

XML

Accrued Payroll and Benefits - Schedule of Accrued Payroll and Benefits (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Statement Of Financial Position [Abstract]
Accrued bonuses	$ 7,854	$ 3,449
Accrued paid time off	2,157	2,154
Accrued payroll	5,536	4,470
Accrued other	2,410	959
Total accrued payroll and benefits	$ 17,957	$ 11,032

XML

Income Taxes - Additional Information (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Income Tax Disclosure [Abstract]
Annual effective tax rate ("ETR") from continuing operations	(12.20%)	5.80%	2.60%	9.60%
Federal statutory rate			21.00%
Income tax expense/(benefits)	$ 3,348,000	$ (412,000)	$ (1,563,000)	$ (1,308,000)
Net deferred tax assets valuation allowance	7,400,000		7,400,000
Uncertain tax positions	$ 0		$ 0

XML

Warrant Options - Additional Information (Details) - USD ($) $ / shares in Units, $ in Thousands			3 Months Ended		9 Months Ended
	Jul. 30, 2020	Jul. 27, 2020	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Jul. 29, 2020	Apr. 30, 2020	Apr. 13, 2020	Dec. 31, 2019	Oct. 31, 2018	Oct. 19, 2018
Class Of Warrant Or Right [Line Items]
Period between issuance and expiration of outstanding warrant									10 years
Share price			$ 16.36	$ 27.30	$ 16.36	$ 27.30
Exercise of the series A-2 preferred stock warrant			$ 44,441
Common Stock
Class Of Warrant Or Right [Line Items]
Warrant exercise price per share	$ 0.01
Exercise of the series A-1 preferred stock warrant, shares			534,240
Exercise of the series A-2 preferred stock warrant,shares	1,999,999		1,999,999
Exercise of the series A-2 preferred stock warrant	$ 44,400
Redeemable Series A-1 Preferred Stock
Class Of Warrant Or Right [Line Items]
Warrants to purchase common stock											534,240	534,240
Warrant exercise price per share											$ 0.01
Period between issuance and expiration of outstanding warrant											10 years
Fair value of warrants							$ 11,900			$ 16,900
Warrants exercised in full for cash, date					Jul. 30, 2020
Redeemable Series A-1 Preferred Stock | Other Expense
Class Of Warrant Or Right [Line Items]
Fair value gains/(losses) of warrants			$ 5,000	$ (2,500)	$ 5,000	$ (4,100)
Redeemable Series A-1 Preferred Stock | Common Stock
Class Of Warrant Or Right [Line Items]
Warrant exercise price per share	$ 0.01
Exercise of the series A-1 preferred stock warrant, shares	534,240
Redeemable Series A-2 Preferred Stock
Class Of Warrant Or Right [Line Items]
Warrants to purchase common stock								1,351,960
Warrant exercise price per share								$ 0.01
Period between issuance and expiration of outstanding warrant								10 years
Aggregate value to determine number of shares underlying the warrant and issuable upon exercise of warrants								$ 30,000
Convertible And Redeemable Series A-2 Preferred Stock
Class Of Warrant Or Right [Line Items]
Warrants to purchase common stock		1,999,999
Share price		$ 15.00
Increase of shares		648,039
Convertible And Redeemable Series A-2 Preferred Stock | Other Expense
Class Of Warrant Or Right [Line Items]
Fair value gains/(losses) of warrants			$ (14,300)		$ (14,300)

XML

Debt - Schedule of Debt (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Apr. 13, 2020	Dec. 31, 2019
Line Of Credit Facility [Line Items]
Total debt		$ 225,000
Capital leases	$ 3,127		$ 3,765
Other leases	2		12
Less deferred debt issuance costs	(4,345)		(1,052)
Total debt	176,451		152,189
Less current portion of long term debt	(5,034)		(7,143)
Long-term debt, less current portion	171,417		145,046
Term Loan Facility
Line Of Credit Facility [Line Items]
Total debt	174,453	175,000	48,750
Revolving Line of Credit
Line Of Credit Facility [Line Items]
Total debt		$ 50,000	97,590
Equipment Line Of Credit
Line Of Credit Facility [Line Items]
Total debt	$ 3,214		$ 3,124

XML

Debt - Additional Information (Details) - USD ($)					3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2020	Apr. 13, 2020	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019	Dec. 31, 2022	Dec. 31, 2021	May 16, 2019	Mar. 12, 2019
Line Of Credit Facility [Line Items]
Line of credit				$ 225,000,000
New credit facility maturity date				Apr. 30, 2025
Debt instrument, repayments term							quarterly
Debt instrument, repayments			$ 500,000
Maximum consolidated leverage ratio			425.00%		425.00%		425.00%		400.00%
Minimum consolidated fixed charge coverage ratio				125.00%					125.00%
Weighted average interest rate			6.00%		6.00%		6.00%
Capital Lease Obligations
Line Of Credit Facility [Line Items]
Capital leased assets, gross			$ 6,300,000		$ 6,300,000		$ 6,300,000		$ 6,900,000
Capital leases, income statement, amortization expense					600,000	$ 400,000	$ 1,600,000	$ 1,000,000
Minimum | Capital Lease Obligations
Line Of Credit Facility [Line Items]
Capital lease asset estimated useful lives							4 years
Maximum [Member] | Capital Lease Obligations
Line Of Credit Facility [Line Items]
Capital lease asset estimated useful lives							6 years
Forecast
Line Of Credit Facility [Line Items]
Debt instrument, repayments	$ 1,600,000	$ 1,100,000
Maximum consolidated leverage ratio										375.00%	400.00%
Incremental Term Loans
Line Of Credit Facility [Line Items]
Line of credit facility, maximum borrowing capacity				$ 100,000,000
Incremental Term Loans | Minimum
Line Of Credit Facility [Line Items]
Percentage of pari passu debt of all lenders to be held by unitranche lenders				70.00%
Leverage Ratio Greater Than Equal to 3.25
Line Of Credit Facility [Line Items]
Percentage of prepayment on excess cash flow less voluntary prepayments of term loan				50.00%
Consolidated fixed leverage ratio				3.25%
Leverage Ratio Less Than 3.00
Line Of Credit Facility [Line Items]
Percentage of prepayment on excess cash flow less voluntary prepayments of term loan				25.00%
Consolidated fixed leverage ratio				3.00%
Prior Senior Secured Credit Facility
Line Of Credit Facility [Line Items]
Loss on extinguishment				$ 1,400,000
Debt fee paid				400,000
Unamortized debt issuance costs				1,000,000
Equipment Line Of Credit
Line Of Credit Facility [Line Items]
Line of credit facility, maximum borrowing capacity													$ 2,000,000
Canadian Equipment Line Of Credit
Line Of Credit Facility [Line Items]
Line of credit facility, maximum borrowing capacity												$ 1,000,000
LIBOR Plus | Prior Senior Secured Credit Facility
Line Of Credit Facility [Line Items]
Interest rate									1.00%
Federal Funds Rate Plus | Prior Senior Secured Credit Facility
Line Of Credit Facility [Line Items]
Interest rate									0.50%
Term Loan Facility
Line Of Credit Facility [Line Items]
Line of credit			$ 174,453,000	$ 175,000,000	$ 174,453,000		$ 174,453,000		$ 48,750,000
Term Loan Facility | Prior Senior Secured Credit Facility
Line Of Credit Facility [Line Items]
Line of credit									50,000,000
Term Loan Facility | LIBOR Plus
Line Of Credit Facility [Line Items]
Interest rate				5.00%
Term Loan Facility | Base Rate Plus
Line Of Credit Facility [Line Items]
Interest rate				4.00%
Term Loan Facility | LIBOR Floor
Line Of Credit Facility [Line Items]
Interest rate				1.00%
Revolving Line of Credit
Line Of Credit Facility [Line Items]
Line of credit				$ 50,000,000					97,590,000
Line of credit facility unused commitment fee				0.35%
Revolving Line of Credit | Prior Senior Secured Credit Facility
Line Of Credit Facility [Line Items]
Line of credit									$ 130,000,000
Revolving Line of Credit | LIBOR Plus
Line Of Credit Facility [Line Items]
Interest rate				3.50%
Revolving Line of Credit | Base Rate Plus
Line Of Credit Facility [Line Items]
Interest rate				2.50%

XML

Debt - Schedule of Applicable Percentages (Details) - Prior Senior Secured Credit Facility	12 Months Ended
	Dec. 31, 2019
Pricing Tier 1
Line Of Credit Facility [Line Items]
Commitment Fee	0.50%
Pricing Tier 1 | Minimum
Line Of Credit Facility [Line Items]
Consolidated Leverage Ratio	375.00%
Pricing Tier 1 | Eurodollar Rate Loans and LIBOR Letter of Credit Fee
Line Of Credit Facility [Line Items]
Interest rate	4.00%
Pricing Tier 1 | Daily Floating Rate Loans
Line Of Credit Facility [Line Items]
Interest rate	4.00%
Pricing Tier 1 | Rate Loans
Line Of Credit Facility [Line Items]
Interest rate	3.00%
Pricing Tier 2
Line Of Credit Facility [Line Items]
Commitment Fee	0.50%
Pricing Tier 2 | Maximum [Member]
Line Of Credit Facility [Line Items]
Consolidated Leverage Ratio	375.00%
Pricing Tier 2 | Minimum
Line Of Credit Facility [Line Items]
Consolidated Leverage Ratio	300.00%
Pricing Tier 2 | Eurodollar Rate Loans and LIBOR Letter of Credit Fee
Line Of Credit Facility [Line Items]
Interest rate	3.50%
Pricing Tier 2 | Daily Floating Rate Loans
Line Of Credit Facility [Line Items]
Interest rate	3.50%
Pricing Tier 2 | Rate Loans
Line Of Credit Facility [Line Items]
Interest rate	2.50%
Pricing Tier 3
Line Of Credit Facility [Line Items]
Commitment Fee	0.40%
Pricing Tier 3 | Maximum [Member]
Line Of Credit Facility [Line Items]
Consolidated Leverage Ratio	300.00%
Pricing Tier 3 | Minimum
Line Of Credit Facility [Line Items]
Consolidated Leverage Ratio	225.00%
Pricing Tier 3 | Eurodollar Rate Loans and LIBOR Letter of Credit Fee
Line Of Credit Facility [Line Items]
Interest rate	3.00%
Pricing Tier 3 | Daily Floating Rate Loans
Line Of Credit Facility [Line Items]
Interest rate	3.00%
Pricing Tier 3 | Rate Loans
Line Of Credit Facility [Line Items]
Interest rate	2.00%
Pricing Tier 4
Line Of Credit Facility [Line Items]
Commitment Fee	0.30%
Pricing Tier 4 | Maximum [Member]
Line Of Credit Facility [Line Items]
Consolidated Leverage Ratio	225.00%
Pricing Tier 4 | Eurodollar Rate Loans and LIBOR Letter of Credit Fee
Line Of Credit Facility [Line Items]
Interest rate	2.50%
Pricing Tier 4 | Daily Floating Rate Loans
Line Of Credit Facility [Line Items]
Interest rate	2.50%
Pricing Tier 4 | Rate Loans
Line Of Credit Facility [Line Items]
Interest rate	1.50%

XML

Debt - Schedule of Capital Leases Mature by 2025 (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2020 USD ($)
Line Of Credit Facility [Line Items]
Payments	$ 7,146
Interest	805
Principal	6,341
2021
Line Of Credit Facility [Line Items]
Payments	2,670
Interest	368
Principal	2,302
2022
Line Of Credit Facility [Line Items]
Payments	2,178
Interest	265
Principal	1,913
2023
Line Of Credit Facility [Line Items]
Payments	1,582
Interest	139
Principal	1,443
2024
Line Of Credit Facility [Line Items]
Payments	667
Interest	32
Principal	635
2025
Line Of Credit Facility [Line Items]
Payments	49
Interest	1
Principal	$ 48

XML

Debt - Schedule of Aggregate Annual Maturities of Long-Term Debt (Details) $ in Thousands	Sep. 30, 2020 USD ($)
Debt Disclosure [Abstract]
2021	$ 5,034
2022	6,839
2023	8,006
2024	7,198
2025	153,719
Total	$ 180,796

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Fair Value of Financial Instruments - Summary of Financial Liabilities Measured at Fair Value on Recurring Basis (Details) - Fair Value, Recurring - Level 3 - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019	Sep. 30, 2019	Dec. 31, 2018
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Level 3 Liabilities	$ 76,971	$ 32,971	$ 18,438	$ 15,572
Business Acquisitions Contingent Consideration, Current
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Level 3 Liabilities	49,170	8,614	1,561	2,754
Business Acquisitions Contingent Consideration, Long-Term
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Level 3 Liabilities	9,742	379
Warrant Options
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Level 3 Liabilities		16,878	$ 16,877	$ 12,818
Conversion Option
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Level 3 Liabilities	$ 18,059
Contingent Put Option
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Level 3 Liabilities		$ 7,100

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Fair Value of Financial Instruments - Summary of Financial Instruments Measured at Fair Value on Recurring Basis (Details) - Fair Value, Recurring - Level 3 - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Beginning balance	$ 32,971	$ 15,572
Foreign currency translation of contingent consideration payment	(208)
Payment of contingent consideration payable	(12,464)	(554)
Acquisitions	45,204	31
Series A-2 compound embedded option	(9,361)
Issuance of warrant option	30,097
Changes in fair value included in earnings	34,879	3,389
Write off of the contingent put option	12,140
Exercise of the warrant options	(56,287)
Ending balance	76,971	18,438
Contingent Put Option
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Beginning balance	7,100
Changes in fair value included in earnings	(19,240)
Write off of the contingent put option	12,140
Embedded Option
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Series A-2 compound embedded option	(9,361)
Changes in fair value included in earnings	27,420
Ending balance	18,059
Business Acquisitions Contingent Consideration, Current
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Beginning balance	8,614	2,754
Foreign currency translation of contingent consideration payment	(208)
Payment of contingent consideration payable	(12,464)	(554)
Acquisitions	34,661	31
Reclass of long term to short term contingent liabilities	180
Changes in fair value included in earnings	18,387	(670)
Ending balance	49,170	1,561
Business Acquisitions Contingent Consideration, Long-Term
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Beginning balance	379
Acquisitions	10,543
Reclass of long term to short term contingent liabilities	(180)
Changes in fair value included in earnings	(1,000)
Ending balance	9,742
Warrant Options
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Beginning balance	16,878	12,818
Issuance of warrant option	30,097
Changes in fair value included in earnings	9,312	4,059
Exercise of the warrant options	$ (56,287)
Ending balance		$ 16,877

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Fair Value of Financial Instruments - Summary of Fair Value of Warrant Options Associated with Issuance of Redeemable Preferred Stock (Details)	Jul. 30, 2020	Apr. 30, 2020	Apr. 13, 2020	Sep. 30, 2019	Oct. 31, 2018
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]
Assumptions used in calculating fair value of the warrant option			10 years
Series A-1 Preferred Stock Warrant Option
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]
Assumptions used in calculating fair value of the warrant option					10 years
Series A-2 Preferred Stock Warrant Option
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]
Assumptions used in calculating fair value of the warrant option		10 years
Common Stock Value (per Share) | Series A-1 Preferred Stock Warrant Option
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]
Assumptions used in calculating fair value of the warrant option	22.22			31.60
Common Stock Value (per Share) | Series A-2 Preferred Stock Warrant Option
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]
Assumptions used in calculating fair value of the warrant option	22.22
Expected Volatility | Series A-1 Preferred Stock Warrant Option
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]
Assumptions used in calculating fair value of the warrant option	0.4435			0.4763
Expected Volatility | Series A-2 Preferred Stock Warrant Option
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]
Assumptions used in calculating fair value of the warrant option	0.4435
Risk-free Interest Rate | Series A-1 Preferred Stock Warrant Option
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]
Assumptions used in calculating fair value of the warrant option	0.0055			0.0168
Risk-free Interest Rate | Series A-2 Preferred Stock Warrant Option
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]
Assumptions used in calculating fair value of the warrant option	0.0055
Expected Life (Years) | Series A-1 Preferred Stock Warrant Option
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]
Assumptions used in calculating fair value of the warrant option	10 years			10 years
Expected Life (Years) | Series A-2 Preferred Stock Warrant Option
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]
Assumptions used in calculating fair value of the warrant option	10 years

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Commitments and Contingencies - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Commitments And Contingencies [Line Items]
Lessee operating lease, expiration year			2028
Rent expense	$ 2.2	$ 2.0	$ 6.4	$ 5.6
Office Equipment
Commitments And Contingencies [Line Items]
Lessee operating lease, expiration year			2025

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Commitments and Contingencies - Schedule of Future Minimum Lease Payments under Leases (Details) $ in Thousands	Sep. 30, 2020 USD ($)
Commitments And Contingencies [Line Items]
2021	$ 6,195
2022	5,192
2023	3,090
2024	1,449
2025 and thereafter	1,386
Total	17,312
Rent
Commitments And Contingencies [Line Items]
2021	5,863
2022	4,865
2023	2,961
2024	1,410
2025 and thereafter	1,385
Total	16,484
Office Equipment
Commitments And Contingencies [Line Items]
2021	332
2022	327
2023	129
2024	39
2025 and thereafter	1
Total	$ 828

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Redeemable Series A-1 Preferred Stock - Additional Information (Details) - USD ($)				3 Months Ended						9 Months Ended	12 Months Ended
	Jul. 27, 2020	Jul. 26, 2020	Apr. 13, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Sep. 30, 2020	Dec. 31, 2019	Oct. 31, 2018	Oct. 19, 2018
Temporary Equity [Line Items]
Share price				$ 16.36			$ 27.30			$ 16.36
Payments for repurchase of redeemable preferred stock in cash	$ 131,800,000									$ 131,821,000
Common stock shares sold under IPO	1,786,739
Percentage of dividends paid in cash			14.20%
Fair value changes in the contingent put option				$ (26,265,000)						$ (19,240,000)
Redeemable Series A-1 Preferred Stock
Temporary Equity [Line Items]
Temporary equity, shares issued				0						0	12,000		12,000
Temporary equity, par value per share				$ 0.0001						$ 0.0001	$ 0.0001		$ 0.0001
Warrants to purchase common stock												534,240	534,240
Temporary equity, liquidation preference per share													$ 10,000
Temporary equity, maturity month and year			2024-10
Temporary equity, penalty term			3 years
Temporary equity, penalty term upon full exercise of warrant			2 years
Percentage of increase in accrued dividend			1.00%
Total accreted value		$ 40,800,000		$ 6,542,000	$ 5,644,000	$ 5,415,000	$ 5,030,000	$ 4,777,000	$ 4,534,000
Accretion of dividends		$ 24,300,000
Temporary equity, covenant description										The Redeemable Series A-1 Preferred Stock contained restrictive covenants. As of December 31, 2019, the Company was subject to a consolidated total leverage ratio (including the outstanding principal and accrued dividend on the Redeemable Series A-1 Preferred Stock) limit of less than 10.0 times as of the end of any fiscal quarter ending until maturity. The Company was in compliance with the covenants as of December 31, 2019.
Percentage of dividends paid in cash										15.00%
Percentage of dividends accrued										14.20%
Accrued and unpaid dividends											$ 21,900,000
Fair value changes in the contingent put option	$ 12,100,000										$ 7,100,000
Changes in fair value				$ 26,300,000						$ 19,200,000
Redeemable Series A-1 Preferred Stock | Maximum [Member]
Temporary Equity [Line Items]
Temporary equity, aggregate amount of redemption requirement			$ 50,000,000
Percentage of accumulated dividends payable in common stock upon IPO			50.00%
Share price			$ 31.60
Percentage of dividend payable in cash			15.00%
Redeemable Series A-1 Preferred Stock | Minimum
Temporary Equity [Line Items]
Percentage of dividend payable in cash			9.00%

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Convertible and Redeemable Series A-2 Preferred Stock - Additional Information (Details) - USD ($) $ / shares in Units, $ in Thousands		3 Months Ended	9 Months Ended
	Apr. 13, 2020	Sep. 30, 2020	Sep. 30, 2020	Dec. 31, 2019
Temporary Equity [Line Items]
Period between issuance and expiration of outstanding warrant	10 years
Proceeds from the Series A-2 and Warrant	$ 175,000
Percentage of dividends accrued	14.20%
Preferred stock, dividends paid		$ 2,870
Convertible And Redeemable Series A-2 Preferred Stock
Temporary Equity [Line Items]
Temporary equity, shares issued	17,500	17,500	17,500	0
Temporary equity, par value per share	$ 0.0001	$ 0.0001	$ 0.0001	$ 0.0001
Debt fee paid	$ 1,300
Percentage of dividends accrued	15.00%
Preferred stock, dividends paid		$ 2,900	$ 2,900
Percentage of discount on common stock market price			15.00%
Percentage of dividend rate stepped downs per year			9.00%
Percentage of dividend rate increase per annum in the event of noncompliance			12.00%
Number of days dividend increase rate applicable noncompliance event occurred			90 days
Percentage of dividend rate increase per annum upon noncompliance occurred and thereafter			14.00%
Number of times increased in debt incurrence test ratio			4.5
Minimum repayment amount			$ 50,000
Minimum repayment amount droppped down			$ 25,000
Temporary equity description			The Company may, at its option on any one or more dates, redeem all or a minimum portion (the lesser of (i) $25.0 million in aggregate stated value of the Convertible and Redeemable Series A-2 Preferred Stock and (ii) all of the Convertible and Redeemable Series A-2 Preferred Stock then outstanding) of the outstanding Convertible and Redeemable Series A-2 Preferred Stock in cash. In the event the Company redeems all or a portion of the Convertible and Redeemable Series A-2 Preferred Stock prior to the three year anniversary of the issuance date, such redemption amount shall include stated value, accrued but unpaid dividends and a make whole payment such that the aggregate redemption amount reflects three years of dividends.
Aggregate stated value of stock redeemed		25,000	$ 25,000
Aggregate liquidation preference		182,200	182,200	$ 0
Compound embedded derivative, fair value net		18,100	18,100
Convertible And Redeemable Series A-2 Preferred Stock | Other Expense
Temporary Equity [Line Items]
Compound embedded derivative, change in value		26,700	27,400
Convertible And Redeemable Series A-2 Preferred Stock | 60-Day Period Prior to Seventh Anniversary
Temporary Equity [Line Items]
Temporary equity convertible into common stock		60,000	60,000
Convertible And Redeemable Series A-2 Preferred Stock | Year 5
Temporary Equity [Line Items]
Temporary equity convertible into common stock		60,000	60,000
Convertible And Redeemable Series A-2 Preferred Stock | Year 6
Temporary Equity [Line Items]
Temporary equity convertible into common stock		$ 120,000	$ 120,000

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Stockholder's Equity (Deficit) - Additional Information (Details) - USD ($) $ / shares in Units, $ in Millions	9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019	May 31, 2015
Class Of Stock [Line Items]
Common stock, shares authorized	190,000,000		25,000,000
Common stock, par value	$ 0.000004		$ 0.000004
Total unrecognized stock compensation expense related to unvested options and restricted stock granted under the Plans	$ 10.4	$ 6.7
Unrecognized expense expected to be recognized period	2 years
Montrose Amended & Restated 2017 Stock Incentive Plan
Class Of Stock [Line Items]
Number of restricted stock shares issued	33,229	30,000
Montrose Amended & Restated 2017 Stock Incentive Plan | Restricted Stock
Class Of Stock [Line Items]
Restricted stock fair value market price per share	$ 31.60	$ 24.00
Shares of vested over period	1 year	3 years
Restricted shares became fully vested and released as common stock	10,000	0
Restricted shares outstanding	267,173	242,025
Restricted shares forfeited	1,667	0
Montrose Amended & Restated 2017 Stock Incentive Plan | Stock Options | Board of Directors
Class Of Stock [Line Items]
Shares of vested over period	4 years
Montrose Amended & Restated 2017 Stock Incentive Plan | Stock Options | Executive Officers
Class Of Stock [Line Items]
Shares of vested over period	3 years
Montrose Amended and Restated 2013 Stock Option Plan
Class Of Stock [Line Items]
Shares outstanding from exercised options	221,950		201,600
Private Offering
Class Of Stock [Line Items]
Warrants to purchase common stock				116,350
Warrant exercise price per share				$ 17.19

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Stockholder's Equity (Deficit) - Summary of Issued and Cancelled Shares of Common Stock (Details) - $ / shares		3 Months Ended		9 Months Ended
	Jul. 27, 2020	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Common stock issued, shares	1,786,739
Number of common stock shares issued in connection with business acquisition			25,408	791,139	150,439
Acquisitions, Average Price per Share			$ 26.90	$ 31.60	$ 22.41
Redemption of Series A-1, Shares		1,786,739		1,786,739
Redemption of Series A-1, Average Price per Share		$ 15.00		$ 15.00
Exercise of warrant options, Shares		2,534,239		2,534,239
Exercise of warrant options, Average Price per Share		$ 0.01		$ 0.01
Exercise of options, Shares		16,850	7,150	20,350	22,675
Exercise of options, Average Price per Share		$ 8.92	$ 6.03	$ 9.27	$ 18.01
Restricted shares, net		8,333		8,333
Restricted shares, net, Average Price per Share		$ 24.00		$ 24.00
Cancellation of shares		(117,785)		(117,785)
Cancellation of shares, Average Price per Share		$ 17.15		$ 17.15
Common Stock Issued and Cancelled, Shares		15,728,376	32,558	16,523,015	173,114
Common Stock Issued and Cancelled, Average Price per share		$ 12.82	$ 22.32	$ 13.72	$ 21.83
Redemption of the series A-1, shares		1,786,739		1,786,739
Exercise of warrant options		2,534,239		2,534,239
IPO
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Common stock issued, shares	11,500,000	11,500,000		11,500,000
Common stock issued in connection with initial public offering, Average Price per Share		$ 15.00		$ 15.00

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Stockholder's Equity (Deficit) - Summary of Number of Shares Authorized to be Issued and Available for Grant (Details) - shares	Sep. 30, 2020	Sep. 30, 2019
2017 Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Shares authorized to be issued	2,945,443	981,800
Shares available for grant	1,233,266	159,428
2013 Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Shares authorized to be issued	2,047,269	2,074,604

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Stockholder's Equity (Deficit) - Schedule of Stock Compensation Expense (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock compensation expense	$ 1,149	$ 1,055	$ 3,439	$ 3,577
2017 Plan | Stock Options
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock compensation expense	868	463	2,151	1,080
2017 Plan | Restricted Stock
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock compensation expense	233	111	973	323
2013 Plan | Stock Options
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock compensation expense	48	481	315	2,174
Cost of Revenue
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock compensation expense	271	375	1,099	1,013
Cost of Revenue | 2017 Plan | Stock Options
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock compensation expense	276	278	973	623
Cost of Revenue | 2013 Plan | Stock Options
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock compensation expense	(5)	97	126	390
Selling, General and Administrative Expense
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock compensation expense	878	680	2,340	2,564
Selling, General and Administrative Expense | 2017 Plan | Stock Options
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock compensation expense	592	185	1,178	457
Selling, General and Administrative Expense | 2017 Plan | Restricted Stock
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock compensation expense	233	111	973	323
Selling, General and Administrative Expense | 2013 Plan | Stock Options
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock compensation expense	$ 53	$ 384	$ 189	$ 1,784

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Stockholder's Equity (Deficit) - Summary of Stock Option Activity (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019	Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Options to Purchase Common Stock Exercised	(16,850)	(7,150)	(20,350)	(22,675)
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]
Weighted Average Remaining Contract Life, Exercised at September 30, 2020			7 years	7 years
Montrose Amended & Restated 2017 Stock Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract]
Weighted-Average Exercise Price per Share Beginning Balance			$ 24	$ 20	$ 20
Weighted-Average Exercise Price per Share Granted			32	27
Weighted-Average Exercise Price per Share Forfeited/cancelled			22	19
Weighted-Average Exercise Price per Share Exercised			14
Weighted-Average Exercise Price per Share Ending Balance	$ 21	$ 24	21	24	24	$ 20
Weighted-Average Exercise Price per Share, Exercised at September 30, 2020	14		14
Weighted-Average Exercise Price per Share Options vested and expected to vest	21		21
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]
Weighted Average Grant Date Fair Value per Share Beginning Balance			12	10	10
Weighted Average Grant Date Fair Value per Share Granted			12	14
Weighted Average Grant Date Fair Value per Share Ending Balance	$ 12	$ 12	$ 12	$ 12	$ 12	$ 10
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]
Weighted Average Remaining Contract Life (in Years) Outstanding			7 years 7 months 2 days	8 years 25 days	7 years 9 months 25 days
Weighted Average Remaining Contract Life, Exercised at September 30, 2020			7 years 3 months 29 days
Weighted Average Remaining Contract Life (in Years) Options vested and expected to vest			9 years 14 days
Aggregate Intrinsic Value of In-The-Money Options Outstanding			$ 4,693	$ 1,151	$ 1,151
Aggregate Intrinsic Value of In-The-Money Options Exercised			7,918
Aggregate Intrinsic Value of In-The-Money Options Outstanding	$ 7,649	$ 4,693	7,649	$ 4,693	$ 4,693	$ 1,151
Aggregate Intrinsic Value of In-The-Money Options Exercised at September 30, 2020	7,649		7,649
Aggregate Intrinsic Value of In-The-Money Options vested and expected to vest	$ 7,649		$ 7,649
Montrose Amended & Restated 2017 Stock Incentive Plan | Common Stock
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Options to Purchase Common Stock Outstanding Beginning Balance			617,852	257,762	257,762
Options to Purchase Common Stock Granted			851,877	356,470
Options to Purchase Common Stock Forfeited/cancelled			(14,375)	(17,700)
Options to Purchase Common Stock Exercised			(925)
Options to Purchase Common Stock Outstanding Ending Balance	1,454,429	596,532	1,454,429	596,532	617,852	257,762
Options to Purchase Common Stock, Exercised at September 30, 2020	925		925
Options to Purchase Common Stock Options vested and expected to vest	1,454,429		1,454,429
Montrose Amended and Restated 2013 Stock Option Plan
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Options to Purchase Common Stock, Exercised at September 30, 2020	221,950		221,950		201,600
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract]
Weighted-Average Exercise Price per Share Beginning Balance			$ 6	$ 6	$ 6
Weighted-Average Exercise Price per Share Forfeited/cancelled			10	8
Weighted-Average Exercise Price per Share Expired			6	8
Weighted-Average Exercise Price per Share Exercised			8	6
Weighted-Average Exercise Price per Share Ending Balance	$ 6	$ 6	6	6	6	$ 6
Weighted-Average Exercise Price per Share, Exercised at September 30, 2020	6		6
Weighted-Average Exercise Price per Share Options vested and expected to vest	6		6
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]
Weighted Average Grant Date Fair Value per Share Beginning Balance			1	1	1
Weighted Average Grant Date Fair Value per Share Ending Balance	$ 1	$ 1	$ 1	$ 1	$ 1	$ 1
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]
Weighted Average Remaining Contract Life (in Years) Outstanding			5 years 7 months 17 days	6 years 7 months 24 days	6 years 4 months 24 days	7 years 3 months 18 days
Weighted Average Remaining Contract Life, Exercised at September 30, 2020			5 years 1 month 20 days
Weighted Average Remaining Contract Life (in Years) Options vested and expected to vest			5 years 2 months 1 day
Aggregate Intrinsic Value of In-The-Money Options Outstanding			$ 46,617	$ 33,290	$ 33,290
Aggregate Intrinsic Value of In-The-Money Options Exercised			354	466
Aggregate Intrinsic Value of In-The-Money Options Outstanding	$ 33,772	$ 47,381	33,772	$ 47,381	$ 46,617	$ 33,290
Aggregate Intrinsic Value of In-The-Money Options Exercised at September 30, 2020	33,772		33,772
Aggregate Intrinsic Value of In-The-Money Options vested and expected to vest	$ 33,772		$ 33,772
Montrose Amended and Restated 2013 Stock Option Plan | Common Stock
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Options to Purchase Common Stock Outstanding Beginning Balance			1,855,469	1,900,404	1,900,404
Options to Purchase Common Stock Forfeited/cancelled			(7,500)	(14,500)
Options to Purchase Common Stock Expired			(11,300)	(5,400)
Options to Purchase Common Stock Exercised			(19,175)	(19,010)
Options to Purchase Common Stock Outstanding Ending Balance	1,817,494	1,861,494	1,817,494	1,861,494	1,855,469	1,900,404
Options to Purchase Common Stock, Exercised at September 30, 2020	221,025		221,025
Options to Purchase Common Stock Options vested and expected to vest	1,817,494		1,817,494

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Stockholder's Equity (Deficit) - Summary of Weighted Average Assumptions Used in Black-Sholes Option-pricing Model (Details) - $ / shares	9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Common stock value (per share)	$ 16.36	$ 27.30
Expected volatility	46.14%	47.94%
Risk-free interest rate	0.41%	2.15%
Expected life (years)	7 years	7 years
Forfeiture rate	0.00%	0.00%
Dividend rate	0.00%	0.00%

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Stockholder's Equity (Deficit) - Schedule of Common Stock Reserved for Future Issuance (Details) - shares	Sep. 30, 2020	Dec. 31, 2019
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Common stock reserved for future issuance	5,109,062	3,706,994
Warrants
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Common stock reserved for future issuance	116,350	650,590
Montrose 2013 Stock Incentive Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Common stock reserved for future issuance	2,047,269	2,058,619
Montrose 2017 Stock Incentive Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Common stock reserved for future issuance	2,945,443	997,785

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Net Loss Per Share - Computation of Basic and Diluted Net Loss Per Share Attributable to Common Stockholders (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended						9 Months Ended
	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Sep. 30, 2020	Sep. 30, 2019
Earnings Per Share [Abstract]
Net loss	$ (30,737)	$ 13,224	$ (41,248)	$ (6,683)	$ (322)	$ (5,242)	$ (58,761)	$ (12,247)
Accretion of redeemable series A-1 preferred stock	(6,542)			(5,030)			(17,601)	(14,341)
Redeemable series A-1 preferred stock deemed dividend	(24,341)						(24,341)
Convertible and redeemable series A-2 preferred stock dividend	(2,870)						(2,870)
Net loss attributable to common stockholders – basic and diluted	$ (64,490)			$ (11,713)			$ (103,573)	$ (26,588)
Weighted-average common shares outstanding – basic and diluted	21,554			8,718			13,669	8,640
Net loss per share attributable to common stockholders – basic and diluted	$ (2.99)			$ (1.34)			$ (7.58)	$ (3.08)

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Net Loss Per Share - Equity Shares Excluded from Calculation of Diluted Net Loss per Share Attributable to Common Stockholders (Details) - shares	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Stock Options
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of loss per share amount	2,423,900	2,062,825	2,423,900	2,062,825
Restricted Stock
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of loss per share amount	176,384	158,426	176,384	158,426
Warrants
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of loss per share amount	116,350	116,350	116,350	116,350

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Segment Information - Additional Information (Details)	9 Months Ended
	Sep. 30, 2020 Segment
Segment Reporting [Abstract]
Number of operating segments	3
Number of reportable segments	3

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Segment Information - Components of Segment Revenues and Adjusted EBITDA (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Segment Reporting Information [Line Items]
Segment Revenues	$ 84,705	$ 57,623	$ 219,502	$ 165,978
Segment Adjusted EBITDA	16,706	8,219	36,157	21,836
Operating Segments
Segment Reporting Information [Line Items]
Segment Revenues	84,705	57,623	219,502	165,978
Segment Adjusted EBITDA	21,468	11,786	51,582	32,771
Assessment, Permitting and Response | Operating Segments
Segment Reporting Information [Line Items]
Segment Revenues	26,593	5,413	49,768	15,017
Segment Adjusted EBITDA	8,230	1,695	14,665	5,693
Measurement and Analysis | Operating Segments
Segment Reporting Information [Line Items]
Segment Revenues	39,770	35,672	113,130	98,521
Segment Adjusted EBITDA	11,226	7,691	30,422	19,761
Remediation and Reuse | Operating Segments
Segment Reporting Information [Line Items]
Segment Revenues	18,342	16,538	56,604	52,440
Segment Adjusted EBITDA	2,012	2,400	6,495	7,317
Corporate and Other
Segment Reporting Information [Line Items]
Segment Adjusted EBITDA	$ (4,762)	$ (3,567)	$ (15,425)	$ (10,935)

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Segment Information - Reconciliation of Segment Measure to Loss Before Benefit from Income Taxes (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Segment Reporting [Abstract]
Total	$ 16,706	$ 8,219	$ 36,157	$ 21,836
Interest expense, net	(3,043)	(2,130)	(10,896)	(4,590)
Income tax (expense) benefit	(3,348)	412	1,563	1,308
Depreciation and amortization	(9,740)	(7,412)	(27,084)	(20,262)
Stock-based compensation	(1,149)	(1,055)	(3,439)	(3,577)
Start-up losses and investment in new services	(602)	(634)	(1,283)	(1,091)
Acquisition costs	(6)	(1,278)	(3,767)	(2,350)
Fair value changes in contingent put option	26,265		19,240
Fair value changes in warrant options	(9,311)	(2,510)	(9,312)	(4,059)
Fair value changes in compound embedded option	(26,664)		(27,420)
Fair value changes in business acquisitions contingent consideration	(13,404)	(256)	(17,387)	670
Short term purchase accounting fair value adjustment to deferred revenue			(243)
IPO preparation costs and IPO related bonuses	(6,378)	(20)	(6,908)	(105)
Discontinued services	(30)		(7,526)
Expenses related to financing transactions			(277)
Other expenses	(33)	(19)	(179)	(27)
Net loss	$ (30,737)	$ (6,683)	$ (58,761)	$ (12,247)

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Related-Party Transactions - Additional Information (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Related Party Transaction [Line Items]
Amount due to related party	$ 0		$ 0		$ 0
Number of shares issued as dividend payment	1,786,739
Number of additional common stock outstanding owned by related party	2,534,239		2,534,239
Percentage of common stock shares outstanding owned by related party	17.30%		17.30%
Acquisition Targets | Selling, General and Administrative Expense
Related Party Transaction [Line Items]
Payment to related party	$ 0	$ 100,000	$ 100,000	$ 400,000

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Defined Contribution Plan - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended		5 Months Ended	9 Months Ended		12 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	May 22, 2020	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Defined Contribution Plan Disclosure [Line Items]
Defined contribution plan, description				401(k) Savings Plan
Defined contribution plan, maximum annual contributions per employee, percent				85.00%		85.00%
Defined contribution plan, employer matching contribution, percent of match			100.00%
Defined contribution plan participant's compensation percent			3.00%
Defined contribution plan percentage of participant's elective deferrals			50.00%
Selling, General and Administrative Expenses
Defined Contribution Plan Disclosure [Line Items]
Defined contribution plan, employer discretionary contribution amount	$ 0.0	$ 0.5		$ 1.2	$ 1.9
Minimum
Defined Contribution Plan Disclosure [Line Items]
Defined contribution plan participant's compensation percent			3.00%
Maximum [Member]
Defined Contribution Plan Disclosure [Line Items]
Defined contribution plan participant's compensation percent			4.00%

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Subsequent Events - Additional Information (Details) - Term Loan Facility	Oct. 06, 2020	Apr. 13, 2020
LIBOR Plus
Subsequent Event [Line Items]
Interest rate		5.00%
LIBOR Plus | Subsequent Event
Subsequent Event [Line Items]
Interest rate	4.50%
LIBOR Floor
Subsequent Event [Line Items]
Interest rate		1.00%
LIBOR Floor | Subsequent Event
Subsequent Event [Line Items]
Interest rate	1.00%