Statements of Operations and Comprehensive Loss (USD $)	12 Months Ended			83 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2013
Operating expenses:
Research and development	$ 956,980	$ 1,165,645	$ 1,844,044	$ 16,948,509
General and administrative	1,644,848	836,781	570,524	4,949,381
Purchase of in-process research and development				650,000
Total operating expenses	2,601,828	2,002,426	2,414,568	22,547,890
Loss from operations	(2,601,828)	(2,002,426)	(2,414,568)	(22,547,890)
Other income (expense):
Interest income	7,248	1,690	10,696	221,100
Interest expense	(159,885)	(24,042)	(2,872)	(365,827)
Change in fair value of preferred stock purchase right				(188,587)
Change in fair value of warrant liability	(82,000)	7,250	5,500	(54,264)
Grant income				244,000
Total other income (expense)	(234,637)	(15,102)	13,324	(143,578)
Net loss and comprehensive loss	$ (2,836,465)	$ (2,017,528)	$ (2,401,244)	$ (22,691,468)
Net loss per common share, basic and diluted	$ (1.20)	$ (1.79)	$ (2.18)
Weighted-average shares used to compute basic and diluted net loss per share	2,368,006	1,124,000	1,102,625