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CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) (USD $)
 3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Revenue:        
Product revenue $ 12,184,215 $ 11,123,236 $ 37,132,094 $ 32,125,076
Royalty and other revenue 6,637,838 3,981,059 15,654,919 11,327,500
Total revenue 18,822,053 15,104,295 52,787,013 43,452,576
Operating expenses:        
Cost of product revenue 5,659,832 6,418,962 17,854,249 19,036,762
Cost of royalty revenue 723,777 594,406 1,943,370 1,593,427
Research and development 1,429,529 2,433,043 5,919,265 8,147,164
Selling, general and administrative 2,902,048 3,126,244 9,334,087 9,973,013
Contingent consideration - fair value adjustments 65,108 343,932 46,521 343,932
Gain on bargain purchase       (314,244)
Total operating expenses 10,780,294 12,916,587 35,097,492 38,780,054
Income from operations 8,041,759 2,187,708 17,689,521 4,672,522
Investment income 76,046 95,807 203,170 156,747
Interest (expense) income (11,704) 7,205 (37,637) (42,536)
Other (expense) income 36,678 (500,414) (56,504) 67,145
Income before income taxes 8,142,779 1,790,306 17,798,550 4,853,878
Income tax provision (benefit) 2,254,505 (16,183) 5,032,853 250,954
Net income 5,888,274 1,806,489 12,765,697 4,602,924
Earnings per share:        
Basic $ 0.18 $ 0.06 $ 0.40 $ 0.15
Diluted $ 0.18 $ 0.06 $ 0.40 $ 0.15
Weighted average shares outstanding:        
Basic 31,858,103 30,948,062 31,583,063 30,841,344
Diluted 32,551,586 31,256,273 32,282,702 31,131,749
Other comprehensive income:        
Unrealized gain (loss) on investments 2,276 2,006 (4,345) 3,975
Foreign currency translation gain (loss) 1,407,860 2,105,074 267,364 1,461,801
Comprehensive income $ 7,298,410 $ 3,913,569 $ 13,028,716 $ 6,068,700