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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

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