4. Prepaid Expenses and Other Current Assets

12 Months Ended

Dec. 31, 2018

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

Prepaid Expenses and Other Current Assets

4.  PREPAID EXPENSES AND OTHER CURRENT ASSETS

The following table sets forth the components of the Company’s prepaid expenses and other current assets at December 31, 2018 and December 31, 2017:

	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

Prepaid expenses and other assets represent prepayments made in the normal course and in which the economic benefit is expected to be realized within twelve months.