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CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($)
 3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Revenue:        
Product revenue $ 21,457,267 $ 15,551,077 $ 42,273,543 $ 29,885,764
Royalty and other revenue       1,991,166
Total revenue 21,457,267 15,551,077 42,273,543 31,876,930
Operating expenses:        
Cost of product revenue 8,586,147 6,671,581 16,659,051 13,006,645
Cost of royalty revenue 0 0 0 0
Research and development 1,251,576 1,430,133 2,819,150 2,631,123
Selling, general and administrative 6,242,275 4,325,834 12,266,801 7,709,444
Contingent consideration - fair value adjustments 768,556 17,700 1,880,930 116,020
Total operating expenses 16,848,554 12,445,248 33,625,932 23,463,232
Income from operations 4,608,713 3,105,829 8,647,611 8,413,698
Investment income 19,012 84,920 55,597 186,736
Interest expense (7,788) (12,780) (16,829) (26,865)
Other income (expense) (268,549) 65,280 (136,518) 67,785
Income before income taxes 4,351,388 3,243,249 8,549,861 8,641,354
Income tax provision 738,831 417,827 2,007,817 1,538,829
Net income $ 3,612,557 $ 2,825,422 $ 6,542,044 $ 7,102,525
Earnings per share:        
Basic $ 0.11 $ 0.09 $ 0.20 $ 0.22
Diluted $ 0.11 $ 0.09 $ 0.19 $ 0.22
Weighted average shares outstanding:        
Basic 32,870,473 32,233,694 32,827,536 32,098,269
Diluted 33,670,696 33,076,384 33,581,682 32,963,554
Other comprehensive income:        
Unrealized gain (loss) on investments $ (4,962) $ 9,882 $ (22,331) $ 12,066
Foreign currency translation gain (loss) 1,447,038 (1,462,603) (2,401,571) (1,605,757)
Comprehensive income $ 5,054,633 $ 1,372,701 $ 4,118,142 $ 5,508,834