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Condensed Consolidated Statements of Operations (Unaudited) (USD $)
 3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Revenue:        
Revenue from licensing agreements and grants $ 38,085 $ 49,257 $ 410,762 $ 121,349
Revenue from product sales 210,749 184,840 482,108 334,215
Total revenue 248,834 234,097 892,870 455,564
Cost of product sales 64,277 52,365 136,236 106,889
Gross profit 184,557 181,732 756,634 348,675
Operating expenses:        
Research and development 3,749,066 5,053,834 7,687,457 10,579,511
Selling, general and administrative 1,775,342 2,103,262 3,699,667 4,178,991
Wind-down expenses 9,902 114,918 45,057 190,055
Total operating expenses 5,534,310 7,272,014 11,432,181 14,948,557
Loss from operations (5,349,753) (7,090,282) (10,675,547) (14,599,882)
Other income (expense):        
Change in fair value of warrant liability 6,205,957 3,020,228 1,264,780 4,803,183
Realized gain on sale of marketable securities   83,750   83,750
Interest income 2,811 6,446 7,021 7,818
Interest expense (14,175) (19,793) (28,622) (40,000)
Other income (expense) (11,318) (35,542) 36,451 (37,297)
Total other income, net 6,183,275 3,055,089 1,279,630 4,817,454
Net income (loss) $ 833,522 $ (4,035,193) $ (9,395,917) $ (9,782,428)
Basic and diluted net income (loss) per share $ 0.03 $ (0.29) $ (0.39) $ (0.71)
Weighted average number of common shares outstanding, basic and diluted 24,806,769 13,802,372 23,882,634 13,741,481