Property, Plant and Equipment - Summary of Property, Plant and Equipment (Detail) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	$ 44,758	$ 43,723
Less accumulated depreciation	(21,358)	(16,453)
Property, plant and equipment, net	23,400	27,270
Land [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	1,627	1,617
Building and Improvements [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	18,063	19,887
Machinery and Equipment [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	$ 25,068	$ 22,219