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CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) (USD $)
 3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Revenue:        
Product revenue $ 13,013,610 $ 11,659,239 $ 24,947,879 $ 21,001,840
Royalty and other revenue 4,495,357 3,864,581 9,017,081 7,346,441
Total revenue 17,508,967 15,523,820 33,964,960 28,348,281
Operating expenses:        
Cost of product revenue 5,297,809 7,345,257 12,194,417 12,617,800
Cost of royalty revenue 642,736 536,933 1,219,593 999,021
Research and development 2,306,332 2,905,658 4,489,736 5,714,121
Selling, general and administrative 3,123,940 3,418,233 6,432,039 6,846,769
Contingent consideration - fair value adjustments 35,387   (18,587)  
Gain on bargain purchase       (314,244)
Total operating expenses 11,406,204 14,206,081 24,317,198 25,863,467
Income from operations 6,102,763 1,317,739 9,647,762 2,484,814
Investment income 65,605 29,516 127,124 60,940
Interest expense (12,402) (27,360) (25,933) (49,741)
Other (expense) income (122,263) 458,298 (93,182) 567,559
Income before income taxes 6,033,703 1,778,193 9,655,771 3,063,572
Income tax provision 1,494,516 208,230 2,778,348 267,137
Net income 4,539,187 1,569,963 6,877,423 2,796,435
Earnings per share:        
Basic $ 0.14 $ 0.05 $ 0.22 $ 0.09
Diluted $ 0.14 $ 0.05 $ 0.21 $ 0.09
Weighted average shares outstanding:        
Basic 31,643,695 30,845,137 31,443,264 30,787,399
Diluted 32,317,156 31,149,090 32,115,519 31,072,445
Other comprehensive income (loss):        
Unrealized gain (loss) on investments (4,638) (6,130) (6,621) 1,969
Foreign currency translation (loss) (883,888) (1,722,999) (1,140,496) (643,273)
Comprehensive income (loss) $ 3,650,661 $ (159,166) $ 5,730,306 $ 2,155,131