Property, Plant and Equipment - Depreciation (Details) - USD ($) $ in Thousands	1 Months Ended	12 Months Ended
	Jul. 31, 2017	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Property, Plant and Equipment
Depreciation expense		$ 6,588	$ 3,791	$ 2,395
Depreciation and amortization - Proppant management system rental		5,792	3,352	2,000
Depreciation and amortization - Proppant management system services		461	160	119
Depreciation - Selling, general and administrative		335	279	276
Capitalized depreciation in property, plant and equipment		$ 668	$ 674	$ 539
Kingfisher Facility
Property, Plant and Equipment
Lease acquisition cost	$ 250