4. Prepaid Expenses and Other Current Assets (Tables)

12 Months Ended

Dec. 31, 2018

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

Schedule of prepaid expenses and other current assets

	December 31, 2018		December 31, 2017
Collaborative development agreement	$	95,766	$	191,531
Prepaid rent		31,773		55,211
Vendor advances		7,867		43,219
Prepaid service agreements		174,920		578,732
Employee advance and other payroll related items		16,208		15,734
Other prepaid expenses and current assets		123,306		150,952
Total	$	449,840	$	1,035,379