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4. PREPAID EXPENSES AND OTHER CURRENT ASSETS (Details) - USD ($)
Dec. 31, 2020
Dec. 31, 2019
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]    
Cash due for warrant exercises $ 194,450 $ 0
Vendor prepayments 83,049 115,682
Prepaid insurance 33,320 30,371
Related party receivable 10,574 1,633
Total prepaid expenses and other current assets $ 321,393 $ 147,686