Condensed Consolidated Statements of Operations and Comprehensive Loss (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Revenues	$ 2,500	$ 170,833	$ 107,500	$ 405,208
Operating expenses:
Research and development costs	1,847,403	1,385,478	5,502,137	4,406,538
General and administrative expenses	1,707,690	1,280,606	4,184,740	3,264,146
Depreciation and amortization	81,393	87,908	181,991	164,154
Total operating expenses	3,636,486	2,753,992	9,868,868	7,834,838
Operating loss	(3,633,986)	(2,583,159)	(9,761,368)	(7,429,630)
Other income (expense):
Interest income	18,776	5,411	45,336	21,601
Interest expense	(448,943)	(335)	(936,471)	(1,789)
Warrant modification expense	(1,945,214)	0	(5,017,156)	0
Loss from change in fair value of derivative instruments	(677,883)	0	(859,682)	0
Litigation settlement	293	692	667	3,265
Total other income (expense)	(3,052,971)	5,768	(6,767,306)	23,077
Net loss	(6,686,957)	(2,577,391)	(16,528,674)	(7,406,553)
Net loss per share - basic and diluted (in dollars per share)	$ (0.09)	$ (0.04)	$ (0.23)	$ (0.14)
Weighted average common shares outstanding - basic and diluted (in shares)	72,986,698	58,363,721	70,533,035	54,751,377
Comprehensive loss:
Net loss	(6,686,957)	(2,577,391)	(16,528,674)	(7,406,553)
Foreign currency translation adjustment	6,101	0	6,101	0
Comprehensive loss	$ (6,680,856)	$ (2,577,391)	$ (16,522,573)	$ (7,406,553)