Summary of Significant Accounting Policies - Property and Equipment (Detail) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Property, Plant and Equipment [Line Items]
Total cost	$ 24,346	$ 90,983
Accumulated depreciation and amortization	(17,236)	(33,414)
Property and equipment, net	7,110	57,569
Land and Land Improvements [Member]
Property, Plant and Equipment [Line Items]
Total cost		4,133
Buildings [Member]
Property, Plant and Equipment [Line Items]
Total cost		26,097
Machinery, Equipment and Tooling [Member]
Property, Plant and Equipment [Line Items]
Total cost	17,769	50,364
Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Total cost	4,624	7,141
Information Systems [Member]
Property, Plant and Equipment [Line Items]
Total cost	991	1,105
Furniture and Fixtures [Member]
Property, Plant and Equipment [Line Items]
Total cost	699	816
Construction in Progress [Member]
Property, Plant and Equipment [Line Items]
Total cost	$ 263	$ 1,327