Computation of Basic and Diluted Loss Per Share (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 03, 2015	Sep. 27, 2014	Oct. 03, 2015	Sep. 27, 2014
Schedule Of Computation Of Basic And Diluted Earnings Per Common Share [Line Items]
Net loss	$ (3,759)	$ (3,559)	$ (6,640)	$ (13,087)
Weighted-average shares - basic	22,004	23,657	22,621	23,814
Effect of dilutive potential common shares	0	0	0	0
Weighted-average shares - diluted	22,004	23,657	22,621	23,814
Net loss per share - basic and diluted	$ (0.17)	$ (0.15)	$ (0.29)	$ (0.55)
Antidilutive shares based on employee awards excluded	2,416	2,401	2,321	2,074