CONDENSED STATEMENTS OF OPERATIONS (Unaudited) (USD $)	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Revenue:
License revenue	$ 0	$ 0
Expenses:
Research and development	12,563,745	6,987,848
General and administrative	3,130,232	3,131,074
Total Expenses	15,693,977	10,118,922
Loss before other income (loss)	(15,693,977)	(10,118,922)
Other income (loss):
Interest income	56,574	70,638
Other income (loss), net	(15,853)	9,898
Gain (loss) on warrant derivative liability	(1,871,294)	14,702,904
Net income (loss)	$ (17,524,550)	$ 4,664,518
Basic net income (loss) per share (in dollars per share)	$ (0.31)	$ 0.09
Basic weighted-average shares outstanding (in shares)	55,722,710	50,314,719
Diluted net income (loss) per share (in dollars per share)	$ (0.31)	$ 0.08
Diluted weighted-average shares outstanding (in shares)	55,722,710	55,727,056