4. Prepaid Expenses and Other Current Assets (Details) - USD ($)	Mar. 31, 2019	Dec. 31, 2018
Prepaid expenses and other current assets	$ 572,097	$ 449,840
Collaborative Development Agreement [Member]
Prepaid expenses and other current assets	71,824	95,766
Prepaid Rent [Member]
Prepaid expenses and other current assets	32,111	31,773
Vendor Advances [Member]
Prepaid expenses and other current assets	6,159	7,867
Prepaid Service Agreements [Member]
Prepaid expenses and other current assets	183,884	174,920
Employee advance and other payroll related items [Member]
Prepaid expenses and other current assets	20,903	16,208
Other Prepaid Expenses and Current Assets [Member]
Prepaid expenses and other current assets	$ 257,216	$ 123,306