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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. 26, 2021
Sep. 27, 2020
Sep. 26, 2021
Sep. 27, 2020
Dec. 27, 2020
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]          
Options converted     (600)    
Employee Stock Option          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Share based compensation expense $ 200 $ 100 $ 500 $ 400  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]          
Beginning number of shares, outstanding (in shares)     652,655    
Options converted     (1,000)    
Granted (in shares)     116,374    
Forfeited / Canceled (in shares)     (20,150)    
Number of shares, outstanding (in shares) 747,879   747,879   652,655
Ending number of shares, options exercisable 528,315   528,315   416,717
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)     $ 17.63    
Exercised (in dollars per share)     9.72    
Granted (in dollars per share)     11.57    
Forfeited / Canceled (in dollars per share)     17.56    
Ending balance of options outstanding (in dollars per share) $ 16.70   16.70   $ 17.63
Options exercisable at end of period $ 17.26   $ 17.26   $ 16.96
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Roll Forward]          
Options outstanding, weighted average remaining contractual term     6 years 10 months 24 days   7 years 1 month 6 days
Optons exercisable, weighted average remaining contractual term     6 years 1 month 6 days   6 years 3 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     $ 665    
Ending value, intrinsic value $ 871   871   $ 665
Options exercisable, aggregate intrinsic value $ 592   $ 592   $ 463
Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]          
Nonvested, number of shares 219,564   219,564   235,938
Nonvested options, weighted average grant date fair value $ 15.36   $ 15.36   $ 18.83
Restricted stock          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Share based compensation expense     $ 400 $ 200  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]          
Beginning number of shares, outstanding (in shares)     25,218    
Granted (in shares)     58,172    
Number of shares, outstanding (in shares) 57,342   57,342   25,218
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)     $ 16.01    
Granted (in dollars per share)     11.99    
Ending balance of options outstanding (in dollars per share) $ 11.25   $ 11.25   $ 16.01
Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]          
Nonvested, number of shares 57,342   57,342   25,218
Nonvested options, weighted average grant date fair value $ 11.25   $ 11.25   $ 16.01