Business Segment and Related Information

The Company has identified the following reportable segments, Environmental Solutions and Maintenance and Technical Services, as each met the quantitative threshold of generating revenues equal to or greater than 10% of the combined revenue of all operating segments.

The accounting policies applied to determine the segment information are the same as those described under “Critical Accounting Policies and Estimates” in the Annual Report on Form 10-K for the year ended December 31, 2018. Management evaluates the performance of each segment based on segment gross profit, which is calculated as revenues less cost of sales. For the six months ended June 30, 2019 and 2018, there were no intersegment revenues or other intersegment transactions. Segment assets are also evaluated by management based on each segment’s investment in property and equipment. Assets (other than property and equipment and goodwill) are not allocated to segments.

Summarized financial information with respect to the reportable segments is as follows:



Three Months Ended June 30, 2019	Environmental Solutions			Maintenance and Technical Services		All Other		Total
Segment revenue	$	36,950		$	83,986	$	—	$	120,936
Segment gross (loss) profit	(9,188		)	7,123		—		(2,065		)
Segment depreciation and amortization expense	1,376			2,012		1,990		5,378



Three Months Ended June 30, 2018	Environmental Solutions		Maintenance and Technical Services		All Other		Total
Segment revenue	$	90,113	$	105,610	$	—	$	195,723
Segment gross profit	22,096		8,453		—		30,549
Segment depreciation and amortization expense	5,334		1,378		1,992		8,704



Six Months Ended June 30, 2019	Environmental Solutions			Maintenance and Technical Services		All Other		Total
Segment revenue	$	95,333		$	188,861	$	—	$	284,194
Segment gross (loss) profit	(921		)	14,235		—		13,314
Segment depreciation and amortization expense	3,690			3,966		3,979		11,635
Expenditures for segment assets	6,957			4,502		32		11,491



Six Months Ended June 30, 2018	Environmental Solutions		Maintenance and Technical Services		All Other		Total
Segment revenue	$	137,897	$	213,355	$	—	$	351,252
Segment gross profit	34,565		15,082		—		49,647
Segment depreciation and amortization expense	10,744		2,407		3,984		17,135
Expenditures for segment assets	3,445		4,788		—		8,233



As of June 30, 2019	Environmental Solutions		Maintenance and Technical Services		All Other		Total
Segment property and equipment, net	$	48,578	$	38,430	$	281	$	87,289
Segment goodwill	57,591		16,622		—		74,213



As of December 31, 2018	Environmental Solutions		Maintenance and Technical Services		All Other		Total
Segment property and equipment, net	$	47,467	$	41,155	$	319	$	88,941
Segment goodwill	57,591		16,622		—		74,213

The following is a reconciliation of segment gross (loss) profit to net (loss) income:



	Three Months Ended						Six Months Ended
	June 30, 2019			June 30, 2018			June 30, 2019			June 30, 2018
Segment gross (loss) profit	$	(2,065	)	$	30,549		$	13,314		$	49,647
General and administrative expenses	(17,400		)	(18,937		)	(31,385		)	(33,319		)
Interest expense, net	(4,102		)	(5,543		)	(9,154		)	(9,674		)
Income from equity method investment	663			699			1,217			1,286
Income tax provision	5,628			(2,906		)	6,389			(2,906		)
Net (loss) income	$	(17,276	)	$	3,862		$	(19,619	)	$	5,034

The following is a reconciliation of segment assets to total assets:



	As of June 30, 2019		As of December 31, 2018
Segment property and equipment, net	$	87,289	$	88,941
Segment goodwill	74,213		74,213
Non-segment assets	285,758		295,747
Total assets	$	447,260	$	458,901

Summarized financial information with respect to the types of revenue recognized is as follows:



Three Months Ended June 30, 2019	Products		Percentage of Completion		Services		Total
Revenue	$	24,890	$	11,900	$	84,146	$	120,936



Three Months Ended June 30, 2018	Products		Percentage of Completion		Services		Total
Revenue	$	27,401	$	60,969	$	107,353	$	195,723



Six Months Ended June 30, 2019	Products		Percentage of Completion		Services		Total
Revenue	$	47,402	$	46,207	$	190,585	$	284,194



Six Months Ended June 30, 2018	Products		Percentage of Completion		Services		Total
Revenue	$	31,566	$	102,652	$	217,034	$	351,252