REVENUES

6 Months Ended

Jun. 30, 2021

Revenue from Contract with Customer [Abstract]

REVENUES

12. REVENUES

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

	For the Six Months Ended
	June 30,
	2021			2020
Product sales	$	3,240,498		$	2,656,056
Maintenance fees		22,610			41,281
Professional services		56,525			10,565
Shipping and handling		185,119			69,373
Discounts and allowances		(11,262	)		(5,065	)
Total revenues	$	3,493,490		$	2,772,210

At June 30, 2021 and December 31, 2020, deferred revenue was $155,747 and $107,489, respectively. The June 30, 2021 balance consists of deferred maintenance fees of $152,447 pertaining to services to be provided through the second quarter of 2027 and a $3,300 prepayment from a customer.