Computation of Basic and Diluted Income (Loss) Per Share (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 28, 2013	Sep. 29, 2012	Sep. 28, 2013	Sep. 29, 2012
Schedule Of Computation Of Basic And Diluted Earnings Per Common Share [Line Items]
Net loss	$ (2,745)	$ (8,007)	$ (17,421)	$ (12,661)
Weighted-average shares - basic	23,931	23,397	23,793	23,293
Effect of dilutive potential common shares
Weighted-average shares - diluted	23,931	23,397	23,793	23,293
Net loss per share - basic and diluted	$ (0.11)	$ (0.34)	$ (0.73)	$ (0.54)
Antidilutive shares based on employee awards excluded	2,551	3,175	2,648	2,999