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4. PREPAID EXPENSES AND OTHER CURRENT ASSETS (Details) - USD ($)
Dec. 31, 2019
Dec. 31, 2018
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]    
Prepaid insurance $ 30,371 $ 29,524
Vendor prepayments 115,682 226,547
Related party receivable 1,633 0
Total prepaid expenses and other current assets $ 147,686 $ 256,071