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CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE INCOME - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Product revenue $ 29,170 $ 21,457 $ 54,265 $ 42,274
Operating expenses:        
Cost of product revenue 12,644 8,586 23,713 16,659
Research and development 1,890 1,252 3,430 2,819
Selling, general and administrative 8,140 6,242 15,159 12,267
Contingent consideration - fair value adjustments 637 768 2,642 1,881
Total operating expenses 23,311 16,848 44,944 33,626
Income from operations 5,859 4,609 9,321 8,648
Investment income 76 19 137 56
Interest expense (638) (8) (643) (17)
Other income (expense) 75 (269) (904) (137)
Income before income taxes 5,372 4,351 7,911 8,550
Income tax provision 1,500 739 2,415 2,008
Net income $ 3,872 $ 3,612 $ 5,496 $ 6,542
Earnings per share:        
Basic $ 0.12 $ 0.11 $ 0.16 $ 0.20
Diluted $ 0.11 $ 0.11 $ 0.16 $ 0.19
Weighted average shares outstanding:        
Basic 33,649,296 32,870,473 33,336,989 32,827,536
Diluted 34,175,127 33,670,696 33,862,311 33,581,682
Other comprehensive income:        
Unrealized gain (loss) on investments   $ (5) $ 15 $ (22)
Foreign currency translation gain (loss) $ (2,514) 1,447 (633) (2,402)
Comprehensive income $ 1,358 $ 5,054 $ 4,878 $ 4,118