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Basic and Diluted Net Income Per Share - Summary of Computation of Basic and Diluted Net Income Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Jan. 01, 2021 | Oct. 02, 2020 | Jul. 03, 2020 | Apr. 03, 2020 | Jan. 03, 2020 | Sep. 27, 2019 | Jun. 28, 2019 | Mar. 29, 2019 | Jan. 01, 2021 | Jan. 03, 2020 | Dec. 28, 2018
Numerator: |  |  |  |  |  |  |  |  |  |  |
Net income | $ 3,327 | $ 3,892 | $ (1,172) | $ (134) | $ 6,379 | $ 2,388 | $ 3,914 | $ 1,367 | $ 5,913 | $ 14,048 | $ 4,968
Weighted average common shares: |  |  |  |  |  |  |  |  |  |  |
Common shares outstanding |  |  |  |  |  |  |  |  | 45,616 | 44,504 | 42,598
Less: Unvested restricted stock |  |  |  |  |  |  |  |  | (11) | (11) | (11)
Denominator for basic calculation |  |  |  |  |  |  |  |  | 45,605 | 44,493 | 42,587
Weighted average effects of potentially diluted common stock: |  |  |  |  |  |  |  |  |  |  |
Diluted |  |  |  |  |  |  |  |  | 47,953 | 46,895 | 45,257
Net income per share: |  |  |  |  |  |  |  |  |  |  |
Basic | $ 0.07 | $ 0.08 | $ (0.03) |  | $ 0.14 | $ 0.05 | $ 0.09 | $ 0.03 | $ 0.13 | $ 0.32 | $ 0.12
Diluted | $ 0.07 | $ 0.08 | $ (0.03) |  | $ 0.14 | $ 0.05 | $ 0.08 | $ 0.03 | $ 0.12 | $ 0.30 | $ 0.11
Employee Stock Options |  |  |  |  |  |  |  |  |  |  |
Weighted average effects of potentially diluted common stock: |  |  |  |  |  |  |  |  |  |  |
Diluted |  |  |  |  |  |  |  |  | 2,272 | 2,254 | 2,360
Unvested Restricted Stock |  |  |  |  |  |  |  |  |  |  |
Weighted average effects of potentially diluted common stock: |  |  |  |  |  |  |  |  |  |  |
Diluted |  |  |  |  |  |  |  |  | 4 | 6 | 10
Restricted Stock Units |  |  |  |  |  |  |  |  |  |  |
Weighted average effects of potentially diluted common stock: |  |  |  |  |  |  |  |  |  |  |
Diluted |  |  |  |  |  |  |  |  | 71 | 142 | 300
Performance Stock Units |  |  |  |  |  |  |  |  |  |  |
Weighted average effects of potentially diluted common stock: |  |  |  |  |  |  |  |  |  |  |
Diluted |  |  |  |  |  |  |  |  | 1 |  |

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