Disaggregated Revenue

12 Months Ended

Dec. 31, 2019

Disaggregation Of Revenue [Abstract]

Disaggregated Revenue

2. Disaggregated Revenue

The following table disaggregates revenue by product line for the years ended December 31:

	2019		2018
Technology products and services	$	31,508	$	50,917
Industrial products and services		15,389		14,873
Base ceramic and sand proppants		84,484		112,819
Sublease and rental income		4,174		—
Oilfield and Industrial Technologies and Services segment		135,555		178,609
Environmental Technologies and Services segment		26,152		32,136
	$	161,707	$	210,745

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 year ended December 31, 2019.  These amounts were classified as a reduction of costs for the same period in 2018.