Consolidated Statements of Operations (USD $)	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Operating expenses:
Research and development	$ 2,303,000	$ 3,242,000
General and administrative	3,208,000	1,829,000
Total operating expenses	5,511,000	5,071,000
Operating loss	(5,511,000)	(5,071,000)
Other income (expense):
Interest income	1,000	1,000
Interest expense	(34,000)	(33,000)
Derivatives gain (loss)	(10,286,000)	0
Other income (expense), net	(10,319,000)	(32,000)
Net loss	$ (15,830,000)	$ (5,103,000)
Net loss per share, basic (in dollars per share)	$ (0.64)	$ (0.28)
Net loss per share, diluted (in dollars per share)	$ (0.64)	$ (0.28)
Weighted average number of common shares outstanding, basic (in shares)	24,909,876	18,540,697
Weighted average number of common shares outstanding, diluted (in shares)	24,909,876	18,540,697