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. 27, 2014	Sep. 28, 2013	Sep. 27, 2014	Sep. 28, 2013
Schedule Of Computation Of Basic And Diluted Earnings Per Common Share [Line Items]
Net loss	$ (3,559)	$ (2,745)	$ (13,087)	$ (17,421)
Weighted-average shares - basic	23,657	23,931	23,814	23,793
Effect of dilutive potential common shares	0	0	0	0
Weighted-average shares - diluted	23,657	23,931	23,814	23,793
Net loss per share - basic and diluted	$ (0.15)	$ (0.11)	$ (0.55)	$ (0.73)
Antidilutive shares based on employee awards excluded	2,401	2,551	2,074	2,648