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CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE INCOME (LOSS) (USD $)
 3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Revenue:    
Product revenue $ 11,934,269 $ 9,342,601
Royalty and other revenue 4,521,724 3,481,860
Total revenue 16,455,993 12,824,461
Operating expenses:    
Cost of product revenue 6,896,608 5,272,543
Cost of royalty revenue 576,857 462,088
Research and development 2,183,404 2,808,463
Selling, general and administrative 3,308,099 3,428,536
Contingent consideration - fair value adjustments (53,974)  
Gain on bargain purchase   (314,244)
Total operating expenses 12,910,994 11,657,386
Income from operations 3,544,999 1,167,075
Investment income 61,519 31,424
Interest expense (13,531) (22,381)
Other (expense) income 29,081 109,261
Income before income taxes 3,622,068 1,285,379
Income tax provision 1,283,832 58,907
Net income 2,338,236 1,226,472
Earnings per share:    
Basic $ 0.07 $ 0.04
Diluted $ 0.07 $ 0.04
Weighted average shares outstanding:    
Basic 31,240,606 30,729,660
Diluted 31,855,428 31,009,833
Other comprehensive income:    
Unrealized gain (loss) on investments (1,983) 8,099
Foreign currency translation gain (loss) (256,608) 1,079,726
Comprehensive income $ 2,079,645 $ 2,314,297