Summary of Significant Accounting Policies - Significant Weighted Average Assumptions Used for Estimating the Fair Value Under Stock Option Plans (Detail)	3 Months Ended		6 Months Ended
	Jun. 29, 2013	Jun. 30, 2012	Jun. 29, 2013	Jun. 30, 2012
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Expected life in years	0 years	4 years	4 years	4 years
Risk free interest rate		0.50%	0.60%	0.60%
Expected volatility		99.00%	93.30%	100.00%
Dividend yield		0.00%	0.00%	0.00%