Disaggregated Revenue

12 Months Ended

Dec. 31, 2018

Disaggregation Of Revenue [Abstract]

Disaggregated Revenue

2. Disaggregated Revenue

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

	2018		2017
Technology products and services	$	50,917	$	43,383
Industrial products and services		14,873		12,030
Base ceramic and sand proppants		112,819		110,144
Oilfield and Industrial Technologies and Services segment		178,609		165,557
Environmental Technologies and Services segment		32,136		23,199
	$	210,745	$	188,756

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.