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CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE INCOME - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Product revenue $ 24,677 $ 19,814 $ 78,942 $ 62,088
Operating expenses:        
Cost of product revenue 11,242 8,444 34,955 25,103
Research and development 1,886 1,490 5,316 4,309
Selling, general and administrative 7,127 5,959 22,286 18,226
Contingent consideration - fair value adjustments 675 233 3,317 2,114
Total operating expenses 20,930 16,126 65,874 49,752
Income from operations 3,747 3,688 13,068 12,336
Investment income 97 37 234 92
Interest expense (1,555) (8) (2,198) (24)
Other expense (75) (38) (979) (175)
Income before income taxes 2,214 3,679 10,125 12,229
Income tax provision 1,059 1,141 3,474 3,149
Net income $ 1,155 $ 2,538 $ 6,651 $ 9,080
Earnings per share:        
Basic $ 0.03 $ 0.08 $ 0.20 $ 0.28
Diluted $ 0.03 $ 0.08 $ 0.20 $ 0.27
Weighted average shares outstanding:        
Basic 33,779,141 32,925,004 33,485,448 32,860,382
Diluted 34,312,887 33,689,560 34,011,534 33,617,999
Other comprehensive income:        
Unrealized gain on investments $ 74 $ 65 $ 89 $ 43
Foreign currency translation loss (386) (596) (1,019) (2,998)
Comprehensive income $ 843 $ 2,007 $ 5,721 $ 6,125