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10. REVENUES
 6 Months Ended
Jun. 30, 2020
Revenue from Contract with Customer [Abstract]  
REVENUES
10. REVENUES

 

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

 

    For the Six Months Ended  
    June 30,  
    2020     2019  
Product sales   $ 2,725,429     $ 2,825,057  
Maintenance fees     41,281       4,888  
Professional services     10,565       –  
Discounts and allowances     (5,065 )     –  
Total revenues   $ 2,772,210     $ 2,829,945  

 

International revenues were $81,538, or 3% of revenues, and $0 during the six months ended June 30, 2020 and 2019, respectively.

 

At June 30, 2020 and December 31, 2019, deferred revenue was $80,183 and $93,609, respectively. The June 30, 2020 balance consists of deferred maintenance fees pertaining to services to be provided through the second quarter of 2025.

 

At December 31, 2018, the Company accrued expected contract losses of $71,744 on an order for a customer that shipped in 2019. As the units were delivered, the loss accrual was proportionally reduced. In the six months ended June 30, 2019, $68,593 was released from the accrual to reduce cost of revenues.