CONDENSED STATEMENTS OF OPERATIONS (Unaudited) (USD $)	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Revenue:
License revenue	$ 0	$ 0
Expenses:
Research and development	6,987,848	3,188,759
General and administrative	3,131,074	1,817,325
Total Expenses	10,118,922	5,006,084
Loss before other income (loss)	(10,118,922)	(5,006,084)
Other income (loss):
Interest income	70,638	40,258
Other income, net	9,898	196,937
Gain (loss) on warrant derivative liabilities	14,702,904	(2,095,220)
Net income (loss)	$ 4,664,518	$ (6,864,109)
Basic net income (loss) per share (in dollars per share)	$ 0.09	$ (0.23)
Basic weighted-average shares outstanding (in shares)	50,314,719	30,417,370
Diluted net income (loss) per share (in dollars per share)	$ 0.08	$ (0.23)
Diluted weighted-average shares outstanding (in shares)	55,727,056	30,417,370