Net Loss Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Apr. 04, 2021	Mar. 29, 2020
Earnings Per Share, Basic [Abstract]
Net income (loss)	$ (7,168)	$ (22,209)
Weighted average common shares outstanding	49,824,140	50,821,101
Basic net income (loss) per share (in dollars per share)	$ (0.14)	$ (0.44)
Diluted net loss per share:
Net income (loss)	$ (7,168)	$ (22,209)
Weighted average common shares outstanding (in shares)	49,824,140	50,821,101
Shares used in computing diluted net income (loss) per share (in shares)	49,824,140	50,821,101
Diluted net income (loss) per share (in shares)	$ (0.14)	$ (0.44)
Shares excluded from diluted net income (loss) per share computations (in shares)	11,013,120	10,664,054