Disaggregated Revenue

6 Months Ended

Jun. 30, 2019

Disaggregation Of Revenue [Abstract]

Disaggregated Revenue

10. Disaggregated Revenue

The following table disaggregates revenue by product line:

	Three Months Ended				Six Months Ended
	June 30				June 30
	2019		2018		2019		2018
Oilfield and Industrial Technologies and Services segment
Technology products and services	$	8,426	$	12,786	$	15,615	$	22,656
Industrial products and services		3,141		3,269		7,868		6,562
Base ceramic and sand proppants		22,944		33,733		49,609		63,038
Sublease and rental income		1,402		—		2,908		—
		35,913		49,788		76,000		92,256
Environmental Technologies and Services segment		7,186		8,201		14,557		15,100
	$	43,099	$	57,989	$	90,557	$	107,356

Sales of oilfield technology products and services, consulting services, and FracPro software are included within Technology products and services.  Sales of industrial ceramic products, industrial technology products and contract manufacturing are included within Industrial products and services.  Sales of oilfield base ceramic and sand proppants, as well as railcar usage fees are included within Base ceramic and sand proppants.  Sublease and rental income primarily consist of the sublease of certain railroad equipment and rental income related to leases on some of our underutilized distribution center assets.  As a result of the adoption of ASC 842 as of January 1, 2019, these amounts were classified within revenues during the three and six months ended June 30, 2019.  These amounts were classified as a reduction of costs for the same periods in 2018.  See Note 4.