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REVENUES
 9 Months Ended
Sep. 30, 2021
Revenue from Contract with Customer [Abstract]  
REVENUES

  

13. REVENUES

 

For each of the identified periods, revenues can be categorized into the following: 

          
   For the Nine Months Ended 
   September 30, 
   2021   2020 
Product sales  $5,206,875   $3,857,228 
Maintenance fees   33,451    18,877 
Professional services   74,440    47,031 
Shipping and handling   214,110    91,573 
Discounts and allowances   (14,774)   (5,065)
Total revenues  $5,514,102   $4,009,644 

 

At September 30, 2021 and December 31, 2020, deferred revenue was $159,596 and $107,489, respectively. The September 30, 2021 balance consists of deferred maintenance fees of $156,296 pertaining to services to be provided through the second quarter of 2027 and a $3,300 prepayment from a customer.