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SHARE-BASED COMPENSATION - Summary of Stock Option and Restricted Stock Activity (Details)
$ / shares in Units, $ in Thousands
9 Months Ended 12 Months Ended
Sep. 29, 2019
USD ($)
$ / shares
shares
Dec. 30, 2018
USD ($)
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]    
Exercised (in shares) (38,614)  
Stock options and restricted stock    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]    
Beginning number of shares, outstanding (in shares) 526,985  
Granted (in shares) 138,750  
Exercised (in shares) (47,790)  
Forfeited / Canceled (in shares) (34,700)  
Number of shares, outstanding (in shares) 583,245 526,985
Ending number of shares, options exercisable 295,045 238,085
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) | $ / shares $ 16.49  
Granted (in dollars per share) | $ / shares 21.49  
Exercised (in dollars per share) | $ / shares 10.19  
Forfeited / Canceled (in dollars per share) | $ / shares 14.39  
Ending balance of options outstanding (in dollars per share) | $ / shares 18.32 $ 16.49
Options exercisable at end of period | $ / shares $ 16.37 $ 13.96
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Roll Forward]    
Options outstanding, weighted average remaining contractual term 7 years 9 months 18 days 7 years 8 months 12 days
Optons exercisable, weighted average remaining contractual term 7 years 1 month 6 days 7 years 2 months 12 days
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Aggregate Intrinsic Value [Roll Forward]    
Beginning balance, intrinsic value | $ $ 2,932  
Ending value, intrinsic value | $ 2,109 $ 2,932
Options exercisable, aggregate intrinsic value | $ $ 1,379 $ 1,684
Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]    
Nonvested, number of shares 288,200 288,900
Nonvested options, weighted average grant date fair value | $ / shares $ 7.73 $ 8.34