STATEMENTS OF OPERATIONS (USD $)	12 Months Ended		89 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2012
Income:
Grant income	$ 0	$ 0	$ 482,235
Collaboration income	195,500	1,354,500	1,550,000
Total income	195,500	1,354,500	2,032,235
Operating expenses:
Research and development	1,023,929	4,136,951	31,019,820
General and administrative	1,611,711	2,116,729	17,937,871
Total operating expenses	2,635,640	6,253,680	48,957,691
Loss from operations	(2,440,140)	(4,899,180)	(46,925,456)
Other income (expense):
Interest income	1,227	6,006	795,192
Interest expense	0	0	(1,273,734)
Other income	545,876	8,388	695,981
Total other income	547,103	14,394	217,439
Net loss	$ (1,893,037)	$ (4,884,786)	$ (46,708,017)
Basic and diluted loss per share (in dollars per share)	$ (0.04)	$ (0.13)
Weighted-average common shares outstanding (in shares)	42,201,848	37,328,519