Summary of Significant Accounting Policies - Property and Equipment (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Property, Plant and Equipment [Line Items]
Total cost	$ 177,415	$ 177,248
Accumulated depreciation and amortization	(72,822)	(69,572)
Property and equipment, net	104,593	107,676
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	32,487	32,482
Machinery, Equipment and Tooling [Member]
Property, Plant and Equipment [Line Items]
Total cost	127,404	127,158
Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Total cost	7,640	7,640
Furniture and Fixtures [Member]
Property, Plant and Equipment [Line Items]
Total cost	961	961
Information Systems [Member]
Property, Plant and Equipment [Line Items]
Total cost	1,140	1,140
Construction in Progress [Member]
Property, Plant and Equipment [Line Items]
Total cost	$ 3,650	$ 3,734