v3.21.2

STOCK-BASED COMPENSATION (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Oct. 03, 2021 | Sep. 27, 2020 | Oct. 03, 2021 | Sep. 27, 2020 | Jun. 28, 2015
Stock-based compensation |  |  |  |  |
Stock-based compensation expense | $ 294 | $ 174 | $ 932 | $ 422 |
Stock Options |  |  |  |  |
Stock-based compensation |  |  |  |  |
Stock-based compensation expense | 62 | 110 | 245 | 235 |
Restricted Stock |  |  |  |  |
Stock-based compensation |  |  |  |  |
Stock-based compensation expense | $ 232 | $ 64 | $ 687 | $ 187 |
Employees and Directors | Stock Options |  |  |  |  |
Stock-based compensation |  |  |  |  |
Expiration period |  |  | 10 years |  |
Employees and Directors | Minimum | Stock Options |  |  |  |  |
Stock-based compensation |  |  |  |  |
Vesting period |  |  | 2 years |  |
Employees and Directors | Maximum | Stock Options |  |  |  |  |
Stock-based compensation |  |  |  |  |
Vesting period |  |  | 5 years |  |
2015 Plan |  |  |  |  |
Stock-based compensation |  |  |  |  |
Shares authorized for issuance |  |  |  |  | 2,000,000
Shares available for grant | 723,690 |  | 723,690 |  |
2005 Plan |  |  |  |  |
Stock-based compensation |  |  |  |  |
Shares available for grant | 0 |  | 0 |  |

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