4. Prepaid Expenses and Other Current Assets (Details) - USD ($)	Sep. 30, 2019	Dec. 31, 2018
Prepaid expenses and other current assets	$ 392,646	$ 449,840
Collaborative Development Agreement [Member]
Prepaid expenses and other current assets	23,942	95,766
Prepaid Rent [Member]
Prepaid expenses and other current assets	32,618	31,773
Vendor Advances [Member]
Prepaid expenses and other current assets	17,378	7,867
Prepaid Service Agreements [Member]
Prepaid expenses and other current assets	243,185	174,920
Employee advance and other payroll related items [Member]
Prepaid expenses and other current assets	22,579	16,208
Other Prepaid Expenses and Current Assets [Member]
Prepaid expenses and other current assets	$ 52,944	$ 123,306