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%