Property, Plant and Equipment (Detail) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Property, Plant and Equipment [Line Items]
Leasehold improvements	$ 14,592	$ 13,306
Equipment	15,214	13,758
Furniture and fixtures	3,218	2,808
Construction in progress	1,264	425
Total property, plant and equipment	34,288	30,297
Less: accumulated depreciation	(19,332)	(16,496)
Property, plant and equipment, net	$ 14,956	$ 13,801