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Condensed Consolidated Statements of Operations (Unaudited) (USD $)
 3 Months Ended
Mar. 31, 2012
Mar. 31, 2011
Revenue:    
Revenue from licensing agreements and grants $ 372,677 $ 72,092
Revenue from product sales 271,359 149,375
Total revenue 644,036 221,467
Cost of product sales 71,959 54,524
Gross profit 572,077 166,943
Operating expenses:    
Research and development 3,938,391 5,525,677
Selling, general and administrative 1,924,325 2,075,729
Wind-down expenses 35,155 75,137
Total operating expenses 5,897,871 7,676,543
Loss from operations (5,325,794) (7,509,600)
Other income (expense):    
Change in fair value of warrant liability (4,941,177) 1,782,955
Interest income 4,210 1,372
Interest expense (14,447) (20,207)
Other income (expense) 47,769 (1,755)
Total other income (expense), net (4,903,645) 1,762,365
Net loss $ (10,229,439) $ (5,747,235)
Basic and diluted net loss per share* $ (0.45) [1] $ (0.42) [1]
Shares used to compute basic and diluted loss per share* 22,958,498 [1] 13,679,913 [1]
[1] Adjusted for the 1-for-10 reverse stock split as discussed in Note 1