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4. PREPAID EXPENSES AND OTHER CURRENT ASSETS
12 Months Ended
Dec. 31, 2019
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]  
PREPAID EXPENSES AND OTHER CURRENT ASSETS

4. PREPAID EXPENSES AND OTHER CURRENT ASSETS

 

Prepaid expenses and other current assets are summarized as follows:

 

   December 31, 
   2019   2018 
Prepaid insurance  $30,371   $29,524 
Vendor prepayments   115,682    226,547 
Related party receivable   1,633     
Total prepaid expenses and other current assets  $147,686   $256,071