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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

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