Net Loss Per Share - Computation of Basic and Diluted Net Income Per Share (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 28, 2019	Sep. 29, 2018	Sep. 28, 2019	Sep. 29, 2018
Earnings Per Share [Abstract]
Net loss	$ (480)	$ (1,099)	$ (4,054)	$ (6,402)
Weighted-average shares – basic	23,130	22,719	22,992	22,429
Weighted-average shares – diluted	23,130	22,719	22,992	22,429
Net loss per share – basic	$ (0.02)	$ (0.05)	$ (0.18)	$ (0.29)
Net loss per share – diluted	$ (0.02)	$ (0.05)	$ (0.18)	$ (0.29)