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Condensed Consolidated Statements of Operations and Comprehensive Income (Unaudited) - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Product revenue $ 26,575 $ 22,898 $ 48,853 $ 38,413
Licensing, milestone and contract revenue 6 6 11 11
Total revenue 26,581 22,904 48,864 38,424
Operating expenses:        
Cost of product revenue 6,065 5,275 11,490 9,588
Research & development 2,792 1,812 4,951 3,910
Selling, general & administrative 4,255 3,388 8,245 6,993
Total operating expenses 13,112 10,475 24,686 20,491
Income from operations 13,469 12,429 24,178 17,933
Interest income, net 49 24 121 48
Income before income taxes 13,518 12,453 24,299 17,981
Provision for income taxes 4,903 4,634 8,789 6,646
Net income $ 8,615 $ 7,819 $ 15,510 $ 11,335
Basic net income per share:        
Net income (in dollars per share) $ 0.59 $ 0.52 $ 1.05 $ 0.76
Basic weighted average common shares outstanding (in shares) 14,679 14,961 14,778 14,934
Diluted net income per share:        
Net income (in dollars per share) $ 0.57 $ 0.51 $ 1.02 $ 0.74
Diluted weighted average common shares outstanding (in shares) 15,111 15,336 15,210 15,332
Net income $ 8,615 $ 7,819 $ 15,510 $ 11,335
Other comprehensive income (loss):        
Unrealized gain (loss) on securities, net of tax (3) (3)
Foreign currency translation adjustment (536) 420 238 (1,828)
Total other comprehensive income (loss) (536) 417 238 (1,831)
Comprehensive income $ 8,079 $ 8,236 $ 15,748 $ 9,504