4. Prepaid and Other Current Assets (Details) - USD ($)	Dec. 31, 2017	Dec. 31, 2016
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]
Prepaid expenses	$ 219,074	$ 199,066
Prepaid insurance	287,244	145,825
Rent deposits	68,196	28,047
Other assets	16,520	10,625
Prepaid and other current assets	$ 591,034	$ 383,563