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SHARE-BASED COMPENSATION - Summary of Stock Option and Restricted Stock Activity (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 27, 2020 | Sep. 29, 2019 | Sep. 27, 2020 | Sep. 29, 2019 | Dec. 29, 2019
Employee Stock Option |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Share based compensation expense | $ 200 | $ 200 | $ 400 | $ 600 |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward] |  |  |  |  |
Beginning number of shares, outstanding (in shares) |  |  | 564,845 |  |
Granted (in shares) |  |  | 88,610 |  |
Forfeited / Canceled (in shares) |  |  | (3,300) |  |
Number of shares, outstanding (in shares) | 650,155 |  | 650,155 |  | 564,845
Ending number of shares, options exercisable | 416,317 |  | 416,317 |  | 313,645
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Weighted Average Exercise Price [Roll Forward] |  |  |  |  |
Beginning balance of options outstanding (in dollars per share) |  |  | $ 18.90 |  |
Granted (in dollars per share) |  |  | 9.72 |  |
Forfeited / Canceled (in dollars per share) |  |  | 24.09 |  |
Ending balance of options outstanding (in dollars per share) | $ 17.62 |  | 17.62 |  | $ 18.90
Options exercisable at end of period | $ 16.96 |  | $ 16.96 |  | $ 16.05
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Roll Forward] |  |  |  |  |
Options outstanding, weighted average remaining contractual term |  |  | 7 years 3 months 18 days |  | 7 years 8 months 12 days
Optons exercisable, weighted average remaining contractual term |  |  | 6 years 7 months 6 days |  | 6 years 9 months 18 days
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Aggregate Intrinsic Value [Roll Forward] |  |  |  |  |
Beginning balance, intrinsic value |  |  | $ 2,412 |  |
Ending value, intrinsic value | $ 79 |  | 79 |  | $ 2,412
Options exercisable, aggregate intrinsic value | $ 79 |  | $ 79 |  | $ 1,991
Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract] |  |  |  |  |
Nonvested, number of shares | 233,838 |  | 233,838 |  | 251,200
Nonvested options, weighted average grant date fair value | $ 18.80 |  | $ 18.80 |  | $ 22.46
Restricted stock |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Share based compensation expense | $ 100 | $ 100 | $ 200 | $ 200 |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward] |  |  |  |  |
Beginning number of shares, outstanding (in shares) |  |  | 18,000 |  |
Granted (in shares) |  |  | 10,032 |  |
Number of shares, outstanding (in shares) | 28,032 |  | 28,032 |  | 18,000
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Weighted Average Exercise Price [Roll Forward] |  |  |  |  |
Beginning balance of options outstanding (in dollars per share) |  |  | $ 28.61 |  |
Granted (in dollars per share) |  |  | 9.72 |  |
Ending balance of options outstanding (in dollars per share) | $ 21.85 |  | $ 21.85 |  | $ 28.61
Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract] |  |  |  |  |
Nonvested, number of shares | 16,524 |  | 16,524 |  | 18,000
Nonvested options, weighted average grant date fair value | $ 20.01 |  | $ 20.01 |  | $ 28.61

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