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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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