Details of Certain Financial Statement Components and Supplemental Disclosures of Cash Flow Information and Non-Cash Activities - Components of Property and Equipment (Detail) - USD ($)	Jun. 27, 2015	Dec. 31, 2014
Property, Plant and Equipment [Line Items]
Property and Equipment, Gross	$ 12,788,000	$ 12,810,000
Less: accumulated depreciation and amortization	(6,046,000)	(4,908,000)
Property and Equipment, Net	6,742,000	7,902,000
Equipment [Member]
Property, Plant and Equipment [Line Items]
Property and Equipment, Gross	11,518,000	11,853,000
Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Property and Equipment, Gross	1,065,000	734,000
Furniture and Fixtures [Member]
Property, Plant and Equipment [Line Items]
Property and Equipment, Gross	$ 205,000	$ 223,000