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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

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