Disaggregated Revenue

3 Months Ended

Mar. 31, 2019

Disaggregation Of Revenue [Abstract]

Disaggregated Revenue

10. Disaggregated Revenue

The following table disaggregates revenue by product line:

	Three Months Ended
	March 31,
	2019		2018
Oilfield and Industrial Technologies and Services segment
Technology products and services	$	7,189	$	9,870
Industrial products and services		4,727		3,292
Base ceramic and sand proppants		26,665		29,305
Sublease and rental income		1,506		—
		40,087		42,467
Environmental Technologies and Services segment		7,371		6,900
	$	47,458	$	49,367

Sales of oilfield technology products and services, consulting services, and FracPro software sales 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 consists 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 months ended March 31, 2019.  These amounts were classified as a reduction of costs for the period ended March 31, 2018.  See Note 4.