Summary of Significant Accounting Policies - Property and Equipment (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Property, Plant and Equipment [Line Items]
Total cost	$ 177,248	$ 172,658
Accumulated depreciation and amortization	(69,572)	(57,438)
Property and equipment, net	107,676	115,220
Land and Land Improvements [Member]
Property, Plant and Equipment [Line Items]
Total cost	4,133	4,133
Buildings [Member]
Property, Plant and Equipment [Line Items]
Total cost	32,482	32,269
Machinery, Equipment and Tooling [Member]
Property, Plant and Equipment [Line Items]
Total cost	127,158	121,313
Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Total cost	7,640	7,696
Furniture and Fixtures [Member]
Property, Plant and Equipment [Line Items]
Total cost	961	949
Information Systems [Member]
Property, Plant and Equipment [Line Items]
Total cost	1,140	1,077
Construction in Progress [Member]
Property, Plant and Equipment [Line Items]
Total cost	$ 3,734	$ 5,221