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Condensed Consolidated Statements of Operations (Unaudited) (USD $)
 3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Revenue:        
Revenue from licensing agreements, grants and other $ 98,293 $ 52,798 $ 145,356 $ 159,773
Revenue from product sales 171,371 271,994 705,992 730,916
Total revenue 269,664 324,792 851,348 890,689
Cost of product sales 58,163 85,743 223,536 230,157
Gross profit 211,501 239,049 627,812 660,532
Operating expenses:        
Research and development 4,657,479 5,184,365 15,654,057 14,553,145
Selling, general and administrative 2,071,198 1,710,749 6,494,595 5,180,027
Wind-down expenses       61,837
Total operating expenses 6,728,677 6,895,114 22,148,652 19,795,009
Loss from operations (6,517,176) (6,656,065) (21,520,840) (19,134,477)
Other income (expense):        
Change in fair value of warrant liability 4,076,360 (143,511) 95,266 425,570
Interest income 2,223 136 6,097 8,772
Interest expense (311,349) (382,119) (1,035,061) (785,122)
Other income (expense), net (7,244) (10,094) (38,128) 8,475
Total other expense, net 3,759,990 (535,588) (971,826) (342,305)
Net loss $ (2,757,186) $ (7,191,653) $ (22,492,666) $ (19,476,782)
Basic and diluted net loss per share $ (0.04) $ (0.17) $ (0.38) $ (0.49)
Weighted average number of common shares outstanding, basic and diluted 66,535,000 41,402,717 59,224,989 39,787,527