Statement of Stockholders' Equity - 9 months ended Sep. 30, 2015 - USD ($)	Common Stock	Additional Paid-in Capital	Accumulated deficit	Accumulated Other Comprehensive Income/(Loss)	Total
Balance at Dec. 31, 2014	$ 39,241	$ 231,152,894	$ (131,969,725)	$ (18,782)	$ 99,203,628
Balance (in shares) at Dec. 31, 2014	39,241,173				39,241,173
Increase (Decrease) in Stockholders' Equity
Stock-based compensation expense		2,348,526			$ 2,348,526
Exercise of stock options	$ 318	682,735			683,053
Exercise of stock options (in shares)	317,681
Net exercise of common stock warrant	$ 2	(2)
Net exercise of common stock warrant (in shares)	2,397
Issuance of common stock, net of issuance costs	$ 11,175	90,499,635			90,510,810
Issuance of common stock, net of issuance costs (in shares)	11,175,000
Unrealized gains on marketable securities				61,182	61,182
Net loss			(35,063,979)		(35,063,979)
Balance at Sep. 30, 2015	$ 50,736	$ 324,683,788	$ (167,033,704)	$ 42,400	$ 157,743,220
Balance (in shares) at Sep. 30, 2015	50,736,251				50,736,251