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CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2018 | Mar. 31, 2017
Revenue: |  |
Product revenue | $ 44,799 | $ 30,569
Royalty and other revenue | 31 | 21
Total revenue | 44,830 | 30,590
Operating expenses: |  |
Cost of product revenue | 19,668 | 13,990
Research and development | 3,288 | 1,742
Selling, general and administrative | 15,898 | 9,182
Total operating expenses | 38,854 | 24,914
Income from operations | 5,976 | 5,676
Investment income | 181 | 96
Interest expense | (1,652) | (1,585)
Other income (expense) | 71 | (120)
Income before income taxes | 4,576 | 4,067
Income tax provision | 1,128 | 999
Net income | $ 3,448 | $ 3,068
Earnings per share: |  |
Basic | $ 0.08 | $ 0.09
Diluted | $ 0.08 | $ 0.09
Weighted average shares outstanding: |  |
Basic | 43,621,270 | 33,891,702
Diluted | 44,326,732 | 34,382,322
Other comprehensive income: |  |
Unrealized gain on investments |  | $ 4
Foreign currency translation gain | $ 251 | 1,027
Comprehensive income | $ 3,699 | $ 4,099

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