Disaggregated Revenue (Tables)

3 Months Ended

Mar. 31, 2019

Disaggregation Of Revenue [Abstract]

Schedule of Disaggregates Revenue by Product Line

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