Details of Certain Financial Statement Components and Supplemental Disclosures of Cash Flow Information and Non-Cash Activities - Additional Information (Detail) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 27, 2015	Jun. 28, 2014	Jun. 27, 2015	Jun. 28, 2014
Property Plant and Equipment Useful Life and Values [Abstract]
Depreciation and amortization expense	$ 502,000	$ 317,000	$ 1,200,000	$ 629,000
Amortization expense	19,000	$ 18,000	37,000	$ 36,000
Amortization expense expected for remainder of 2015	38,000		38,000
Amortization expense expected in 2016	75,000		75,000
Amortization expense expected in 2017	$ 75,000		$ 75,000