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Basic and Diluted Net Income (Loss) Per Share - Summary of Computation of Basic and Diluted Net Income (Loss) Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 28, 2018	Sep. 28, 2018	Jun. 29, 2018	Mar. 30, 2018	Dec. 29, 2017	Sep. 29, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 28, 2018	Dec. 29, 2017	Dec. 30, 2016
Numerator:
Net income (loss)	$ 1,096	$ 1,459	$ 1,830	$ 583	$ (138)	$ 1,173	$ (971)	$ (2,203)	$ 4,968	$ (2,139)	$ (12,129)
Weighted average common shares:
Common shares outstanding									42,598	41,025	40,352
Unvested restricted stock (in shares)									(11)	(21)	(23)
Denominator for basic calculation									42,587	41,004	40,329
Weighted average effects of potentially diluted common stock:
Diluted									45,257	41,004	40,329
Net income (loss) per share:
Basic									$ 0.12	$ (0.05)	$ (0.30)
Diluted									$ 0.11	$ (0.05)	$ (0.30)
Employee Stock Option
Weighted average effects of potentially diluted common stock:
Diluted									2,360	0	0
Restricted Stock
Weighted average effects of potentially diluted common stock:
Diluted									10	0	0
Unvested Restricted Stock
Weighted average effects of potentially diluted common stock:
Diluted									300	0	0

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