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CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Revenue:        
Product revenue $ 36,514 $ 24,677 $ 99,516 $ 78,942
Royalty and other revenue 66   108  
Total revenue 36,580 24,677 99,624 78,942
Operating expenses:        
Cost of product revenue 19,987 11,242 47,913 34,955
Research and development 2,001 1,886 5,603 5,316
Selling, general and administrative 14,998 7,127 35,365 22,286
Contingent consideration - fair value adjustments   675   3,317
Total operating expenses 36,986 20,930 88,881 65,874
Income (loss) from operations (406) 3,747 10,743 13,068
Investment income 102 97 308 234
Interest expense (1,618) (1,555) (4,804) (2,198)
Other income (expense) (100) (75) (548) (979)
Income (loss) before income taxes (2,022) 2,214 5,699 10,125
Income tax (benefit) provision (6,691) 1,059 (10,476) 3,474
Net income $ 4,669 $ 1,155 $ 16,175 $ 6,651
Earnings per share:        
Basic $ 0.11 $ 0.03 $ 0.44 $ 0.20
Diluted $ 0.11 $ 0.03 $ 0.43 $ 0.20
Weighted average shares outstanding:        
Basic 41,236,554 33,779,141 36,435,591 33,485,448
Diluted 42,563,002 34,312,887 37,386,333 34,011,534
Other comprehensive income:        
Unrealized gain (loss) on investments   $ 74 $ 5 $ 89
Foreign currency translation gain (loss) $ 2,025 (386) 7,097 (1,019)
Comprehensive income $ 6,694 $ 843 $ 23,277 $ 5,721