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CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Revenue:        
Product revenue $ 32,434 $ 29,170 $ 63,003 $ 54,265
Royalty and other revenue 21   42  
Total revenue 32,455 29,170 63,045 54,265
Operating expenses:        
Cost of product revenue 13,937 12,644 27,926 23,713
Research and development 1,860 1,890 3,602 3,430
Selling, general and administrative 11,185 8,140 20,367 15,159
Contingent consideration - fair value adjustments   637   2,642
Total operating expenses 26,982 23,311 51,895 44,944
Income from operations 5,473 5,859 11,150 9,321
Investment income 110 76 206 137
Interest expense (1,601) (638) (3,187) (643)
Other income (expense) (328) 75 (448) (904)
Income before income taxes 3,654 5,372 7,721 7,911
Income tax (benefit) provision (4,784) 1,500 (3,785) 2,415
Net income $ 8,438 $ 3,872 $ 11,506 $ 5,496
Earnings per share:        
Basic $ 0.25 $ 0.12 $ 0.34 $ 0.16
Diluted $ 0.24 $ 0.11 $ 0.33 $ 0.16
Weighted average shares outstanding:        
Basic 34,097,805 33,649,296 33,995,323 33,336,989
Diluted 35,094,814 34,175,127 34,715,797 33,862,311
Other comprehensive income:        
Unrealized gain (loss) on investments     $ 5 $ 15
Foreign currency translation gain (loss) $ 4,046 $ (2,514) 5,073 (633)
Comprehensive income $ 12,484 $ 1,358 $ 16,584 $ 4,878