Disaggregated Revenue

9 Months Ended

Sep. 30, 2019

Disaggregation Of Revenue [Abstract]

Disaggregated Revenue

10. Disaggregated Revenue

The following table disaggregates revenue by product line:

	Three Months Ended				Nine Months Ended
	September 30				June 30
	2019		2018		2019		2018
Oilfield and Industrial Technologies and Services segment
Technology products and services	$	9,540	$	12,922	$	25,155	$	35,578
Industrial products and services		4,046		4,153		11,914		10,714
Base ceramic and sand proppants		22,911		27,520		72,521		90,558
Sublease and rental income		777		—		3,684		—
		37,274		44,595		113,274		136,850
Environmental Technologies and Services segment		6,231		9,224		20,788		24,325
	$	43,505	$	53,819	$	134,062	$	161,175

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 nine months ended September 30, 2019.  These amounts were classified as a reduction of costs for the same periods in 2018.  See Note 4.