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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Changes In The Allowance For Doubtful Accounts (Details) - USD ($)
3 Months Ended 9 Months Ended
Sep. 29, 2019
Sep. 30, 2018
Sep. 29, 2019
Sep. 30, 2018
Allowance for Doubtful Accounts Receivable [Roll Forward]        
Beginning balance     $ 468,233 $ 473,573
Provision for (recovery of) doubtful accounts, net $ 34,667 $ 21,514 6,065 39,389
Amounts written off, net (34,667) (21,514) (6,065) (39,389)
Ending balance $ 468,233 $ 473,573 $ 468,233 $ 473,573