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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 12 Months Ended
Mar. 31, 2019
Dec. 30, 2018
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]    
Exercised (in shares) (11,840)  
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) 68,750  
Exercised (in shares) (11,840)  
Forfeited / Canceled (in shares) (12,950)  
Number of shares, outstanding (in shares) 570,945 526,985
Ending number of shares, options exercisable 239,995 238,085
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) $ 16.49  
Granted (in dollars per share) 26.44  
Exercised (in dollars per share) 13.89  
Forfeited / Canceled (in dollars per share) 12.42  
Ending balance of options outstanding (in dollars per share) 17.83 $ 16.49
Options exercisable at end of period $ 14.68 $ 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 15 days 7 years 8 months 12 days
Optons exercisable, weighted average remaining contractual term 7 years 1 month 24 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 3,282 $ 2,932
Options exercisable, aggregate intrinsic value $ 1,916 $ 1,684
Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]    
Nonvested, number of shares 330,950 288,900
Nonvested options, weighted average grant date fair value $ 8.54 $ 8.34