Disaggregated Revenue (Tables)

9 Months Ended

Sep. 30, 2019

Disaggregation Of Revenue [Abstract]

Schedule of Disaggregates Revenue by Product Line

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