4. PREPAID EXPENSES AND OTHER CURRENT ASSETS (Tables)

12 Months Ended

Dec. 31, 2020

Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]

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