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SHARE-BASED COMPENSATION - Summary of Stock Option Activity (Details) - USD ($)
3 Months Ended 6 Months Ended 12 Months Ended
Jul. 01, 2018
Jun. 25, 2017
Jul. 01, 2018
Jun. 25, 2017
Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]          
Exercised (in shares)     (51,550)    
Employee Stock Option          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Allocated Share-based Compensation Expense $ 50,007 $ 187,168 $ 114,836 $ 264,731  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]          
Beginning number of shares, outstanding (in shares)     765,411    
Exercised (in shares)     (52,550)    
Forfeited / Canceled (in shares)     (292,088)    
Number of shares, outstanding (in shares) 420,773   420,773   765,411
Ending number of shares, options exercisable 256,373   256,373   498,611
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)     $ 10.27    
Exercised (in dollars per share)     9.34    
Forfeited / Canceled (in dollars per share)     6.71    
Ending balance of options outstanding (in dollars per share) $ 12.85   12.85   $ 10.27
Options exercisable at end of period $ 11.67   $ 11.67   $ 8.74
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Roll Forward]          
Options outstanding, weighted average remaining contractual term     7 years 6 months   7 years 3 months 7 days
Optons exercisable, weighted average remaining contractual term     7 years 1 month 10 days   6 years 9 months 15 days
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Aggregate Intrinsic Value [Roll Forward]          
Beginning balance, intrinsic value     $ 4,521,000    
Ending value, intrinsic value $ 4,374,000   4,374,000   $ 4,521,000
Options exercisable, aggregate intrinsic value $ 2,968,000   $ 2,968,000   $ 3,640,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]          
Nonvested, number of shares 164,400   164,400   266,800
Nonvested options, weighted average grant date fair value $ 3.16   $ 3.16   $ 3.09