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CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (USD $)
 3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Revenue:        
Revenue from licensing agreements, grants and other $ 31,333 $ 38,085 $ 106,975 $ 410,762
Revenue from product sales 250,364 210,749 458,922 482,108
Total revenue 281,697 248,834 565,897 892,870
Cost of product sales 77,573 64,277 144,414 136,236
Gross profit 204,124 184,557 421,483 756,634
Operating expenses:        
Research and development 4,804,890 3,749,066 9,368,780 7,687,457
Selling, general and administrative 1,581,521 1,775,342 3,469,278 3,699,667
Wind-down expenses 38,978 9,902 61,837 45,057
Total operating expenses 6,425,389 5,534,310 12,899,895 11,432,181
Loss from operations (6,221,265) (5,349,753) (12,478,412) (10,675,547)
Other income (expense):        
Change in fair value of warrant liability 757,688 6,205,957 569,081 1,264,780
Interest income 1,790 2,811 8,636 7,021
Interest expense (392,855) (14,175) (403,003) (28,622)
Other income (expense), net (14,040) (11,318) 18,569 36,451
Total other income (expense), net 352,583 6,183,275 193,283 1,279,630
Net income (loss) $ (5,868,682) $ 833,522 $ (12,285,129) $ (9,395,917)
Basic and diluted net income (loss) per share $ (0.15) $ 0.03 $ (0.32) $ (0.39)
Weighted average number of common shares outstanding, basic and diluted 39,661,934 24,806,769 38,966,547 23,882,634