Net Income (Loss) Per Share - Computation of Basic and Diluted Net Loss Per Share (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 03, 2021	Jun. 27, 2020	Jul. 03, 2021	Jun. 27, 2020
Earnings Per Share [Abstract]
Net income (loss)	$ (6,126)	$ 1,524	$ (12,630)	$ 300
Weighted-average shares – basic	24,241	23,561	24,137	23,522
Effect of dilutive potential common shares	0	345	0	431
Weighted-average shares – diluted	24,241	23,906	24,137	23,953
Net income (loss) per share – basic	$ (0.25)	$ 0.06	$ (0.52)	$ 0.01
Net income (loss) per share – diluted	$ (0.25)	$ 0.06	$ (0.52)	$ 0.01