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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
	Jan. 03, 2020	Sep. 27, 2019	Jun. 28, 2019	Mar. 29, 2019	Dec. 28, 2018	Sep. 28, 2018	Jun. 29, 2018	Mar. 30, 2018	Jan. 03, 2020	Dec. 28, 2018	Dec. 29, 2017
Numerator:
Net income (loss)	$ 6,379	$ 2,388	$ 3,914	$ 1,367	$ 1,096	$ 1,459	$ 1,830	$ 583	$ 14,048	$ 4,968	$ (2,139)
Weighted average common shares:
Common shares outstanding									44,504	42,598	41,025
Unvested restricted stock (in shares)									(11)	(11)	(21)
Denominator for basic calculation									44,493	42,587	41,004
Weighted average effects of potentially diluted common stock:
Diluted									46,895	45,257	41,004
Net income (loss) per share:
Basic	$ 0.14	$ 0.05	$ 0.09	$ 0.03	$ 0.02	$ 0.03	$ 0.04	$ 0.01	$ 0.32	$ 0.12	$ (0.05)
Diluted	$ 0.14	$ 0.05	$ 0.08	$ 0.03	$ 0.02	$ 0.03	$ 0.04	$ 0.01	$ 0.30	$ 0.11	$ (0.05)
Employee Stock Option
Weighted average effects of potentially diluted common stock:
Diluted									2,254	2,360	0
Unvested Restricted Stock
Weighted average effects of potentially diluted common stock:
Diluted									6	10	0
Restricted Stock Units
Weighted average effects of potentially diluted common stock:
Diluted									142	300	0

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