Stockholders' Equity (Tables)

9 Months Ended

Sep. 30, 2015

Stockholders' Equity

Schedule of stock-based compensation expense related to stock options

	Three Months Ended September 30,
	2015		2014
Research and development	$	220,748	$	148,244
General and administrative	525,751		232,765
Total stock-based compensation expense	$	746,499	$	381,009

	Nine Months Ended September 30,
	2015		2014
Research and development	$	856,671	$	483,677
General and administrative	1,272,501		489,677
Total stock-based compensation expense	$	2,129,172	$	973,354