Certain Financial Statement Information - Property and Equipment (Detail) (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 28, 2014	Dec. 28, 2013
Property, Plant and Equipment [Line Items]
Property and equipment, Gross	$ 55,339	$ 54,622
Less accumulated depreciation and amortization	(34,935)	(31,500)
Property and equipment, Net	20,404	23,122
Computer equipment and software
Property, Plant and Equipment [Line Items]
Property and equipment, Gross	6,736	6,390
Computer equipment and software | Minimum
Property, Plant and Equipment [Line Items]
Property and equipment, Useful Life (Years)	3 years
Computer equipment and software | Maximum
Property, Plant and Equipment [Line Items]
Property and equipment, Useful Life (Years)	5 years
Machinery and equipment
Property, Plant and Equipment [Line Items]
Property and equipment, Useful Life (Years)	5 years
Property and equipment, Gross	41,541	40,427
Office furniture and equipment
Property, Plant and Equipment [Line Items]
Property and equipment, Useful Life (Years)	7 years
Property and equipment, Gross	789	1,081
Leasehold improvements
Property, Plant and Equipment [Line Items]
Property and equipment, Gross	4,896	5,180
Construction in progress
Property, Plant and Equipment [Line Items]
Property and equipment, Gross	$ 1,377	$ 1,544