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4. PREPAID EXPENSES AND OTHER CURRENT ASSETS | 12 Months Ended
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Dec. 31, 2020
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, |
|  | 2020 |  |  | 2019 |
Cash due for warrant exercises |  | $ | 194,450 |  |  | $ | – |
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 |
See Note 15 for subsequent collection of the cash due for warrant exercises.

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