Property, Plant and Equipment-Net (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Property, Plant and Equipment [Line Items]
Property, plant and equipment	$ 51,967	$ 51,383
Less: accumulated depreciation and amortization	(12,821)	(11,294)
Property, plant and equipment-net	39,146	40,089
Plant equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment	31,018	25,918
Building and improvements
Property, Plant and Equipment [Line Items]
Property, plant and equipment	5,725	5,514
Lab equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment	7,439	6,445
Leasehold improvements
Property, Plant and Equipment [Line Items]
Property, plant and equipment	2,695	2,659
Computer equipment and software
Property, Plant and Equipment [Line Items]
Property, plant and equipment	3,954	3,387
Furniture and fixtures
Property, Plant and Equipment [Line Items]
Property, plant and equipment	657	603
Land
Property, Plant and Equipment [Line Items]
Property, plant and equipment	430	430
Automobiles
Property, Plant and Equipment [Line Items]
Property, plant and equipment	49	49
Construction in progress
Property, Plant and Equipment [Line Items]
Property, plant and equipment	$ 0	$ 6,378