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Consolidated Statements of Operations and Comprehensive Income (Loss) (USD $)
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Revenues:      
Revenue from collaborative research $ 56,753,123 $ 59,645,819 $ 47,054,397
Grant revenue 1,281,545 4,180,279 10,152,969
Total revenues 58,034,668 63,826,098 57,207,366
Costs and expenses:      
Research and development 46,581,930 45,432,894 41,088,899
General and administrative 11,086,759 10,187,894 10,868,791
Total costs and expenses 57,668,689 55,620,788 51,957,690
Income (loss) from operations 365,979 8,205,310 5,249,676
Other income (expense) (626,814) 156,445 1,467,444
Net comprehensive income (loss) $ (260,835) $ 8,361,755 $ 6,717,120
Basic net income (loss) per common share $ (0.04) $ 0.00 $ 0.00
Diluted net income (loss) per common share $ (0.04) $ 0.00 $ 0.00
Basic weighted average number of common shares 6,847,697 1,083,276 1,025,602
Diluted weighted average number of common shares 6,847,697 1,083,276 1,025,602