Condensed Consolidated Statements of Operations (unaudited) (USD $)	3 Months Ended				6 Months Ended
	Jun. 30, 2011		Jun. 30, 2010		Jun. 30, 2011		Jun. 30, 2010
Revenue:
Revenue from licensing agreements and grants	$ 49,257		$ 171,550		$ 121,349		$ 285,399
Revenue from product sales	184,840		72,581		334,215		189,005
Total revenue	234,097		244,131		455,564		474,404
Cost of product sales	52,365		24,862		106,889		68,624
Gross profit	181,732		219,269		348,675		405,780
Operating expenses:
Research and development	5,053,834		4,858,228		10,579,511		9,895,742
Selling, general and administrative	2,103,262		2,286,678		4,178,991		4,871,420
Wind-down expenses	114,918		125,833		190,055		291,168
Total operating expenses	7,272,014		7,270,739		14,948,557		15,058,330
Loss from operations	(7,090,282)		(7,051,470)		(14,599,882)		(14,652,550)
Other income (expense):
Realized gain on sale of marketable securities	83,750				83,750
Change in fair value of warrant liability	3,020,228		2,440,370		4,803,183		3,956,719
Interest income	6,446		13,309		7,818		13,903
Interest expense	(19,793)		(25,054)		(40,000)		(50,554)
Other expense	(35,542)		12,498		(37,297)		(1,940)
Total other income (expense), net	3,055,089		2,441,123		4,817,454		3,918,128
Net loss	$ (4,035,193)		$ (4,610,347)		$ (9,782,428)		$ (10,734,422)
Basic and diluted net loss per share*	$ (0.29)	[1]	$ (0.38)	[1]	$ (0.71)	[1]	$ (0.90)	[1]
Shares used to compute basic and diluted loss per share*	13,802,372	[1]	11,990,573	[1]	13,741,481	[1]	11,943,505	[1]

[1] Adjusted for the 1-for-10 reverse stock split as discussed in Note 1