4. Prepaid Expenses and Other Current Assets

3 Months Ended

Mar. 31, 2019

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 March 31, 2019, and December 31, 2018:

	March 31, 2019		December 31, 2018
Collaborative development agreement	$	71,824	$	95,766
Prepaid rent		32,111		31,773
Vendor advances		6,159		7,867
Prepaid service agreements		183,884		174,920
Employee advance and other payroll related items		20,903		16,208
Other prepaid expenses and current assets		257,216		123,306
Total	$	572,097	$	449,840

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.