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CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) (USD $)
 3 Months Ended
Mar. 31, 2012
Mar. 31, 2011
Revenue:    
Product revenue $ 9,342,601 $ 3,150,529
Royalty and other revenue 3,481,860 2,755,856
Total revenue 12,824,461 5,906,385
Operating expenses:    
Cost of product revenue 5,026,320 1,393,089
Cost of royalty and other revenue 462,088 376,890
Research and development 2,808,463 3,784,271
Selling, general and administrative 3,674,759 2,438,636
Gain on bargain purchase (314,244)  
Total operating expenses 11,657,386 7,992,886
Income (loss) from operations 1,167,075 (2,086,501)
Investment income 31,424 69,298
Interest expense (22,381) (13,484)
Other income 109,261  
Income (loss) before income taxes 1,285,379 (2,030,687)
Income tax provision 58,907  
Net income (loss) 1,226,472 (2,030,687)
Earnings (loss) per share:    
Basic $ 0.04 $ (0.07)
Diluted $ 0.04 $ (0.07)
Weighted average shares outstanding:    
Basic 30,729,660 30,792,428
Diluted 31,009,833 30,792,428
Comprehensive income (loss) $ 2,314,297 $ (2,030,687)