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Condensed Consolidated Statements of Operations (Unaudited) (USD $)
 3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Revenue:    
Revenue from licensing agreements, grants and other $ 23,584 $ 75,642
Revenue from product sales 315,896 208,558
Total revenue 339,480 284,200
Cost of product sales 87,276 66,841
Gross profit 252,204 217,359
Operating expenses:    
Research and development 4,904,294 4,563,890
Selling, general and administrative 2,247,600 1,887,757
Wind-down expenses   22,859
Total operating expenses 7,151,894 6,474,506
Loss from operations (6,899,690) (6,257,147)
Other income (expense):    
Change in fair value of warrant liability (326,624) (188,607)
Interest income 2,185 6,846
Interest expense (380,488) (10,148)
Other income (expense), net (15,639) 32,609
Total other expense, net (720,566) (159,300)
Net loss $ (7,620,256) $ (6,416,447)
Basic and diluted net loss per share $ (0.14) $ (0.17)
Weighted average number of common shares outstanding, basic and diluted 55,343,877 38,263,434