Stockholders' Equity (Tables)

3 Months Ended

Mar. 31, 2015

Stockholders' Equity

Schedule of stock-based compensation expense related to stock options

	Three Months Ended March 31
	2015		2014
Research and development	$	315,907	$	126,525
General and administrative	328,814		101,581
Total stock-based compensation expense	$	644,721	$	228,106