Income Tax - Additional Information (Detail) (USD $)	3 Months Ended		6 Months Ended
	Jun. 28, 2013	Jun. 29, 2012	Jun. 28, 2013	Jun. 29, 2012	Dec. 28, 2012	Dec. 30, 2011
Income Tax Disclosure [Line Items]
Income tax provision	$ 581,000	$ 1,658,000	$ 556,000	$ 3,160,000
Effective tax rate	20.10%	37.30%	21.70%	29.80%
Income tax provision on undistributed foreign earnings			0
Liability for unrecognized tax benefit	87,000	154,000	87,000	154,000	109,000	132,000
Interest related to certain tax position	2,000	2,000	2,000	2,000
China Subsidiary [Member]
Income Tax Disclosure [Line Items]
Valuation allowance on deferred tax asset	$ 851,000		$ 851,000
Singapore Subsidiary [Member]
Income Tax Disclosure [Line Items]
Income tax holiday termination year			Beginning January 2015