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Unaudited Quarterly Consolidated Financial Data (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Unaudited Quarterly Consolidated Financial Data |  |  |  |  |  |  |  |  |  |  |
Revenue | $ 22,232 | $ 28,626 | $ 27,120 | $ 24,419 | $ 26,332 | $ 28,168 | $ 23,557 | $ 20,616 | $ 102,397 | $ 98,673 | $ 81,349
Gross Profit | 5,850 | 10,614 | 11,010 | 9,573 | 9,798 | 11,133 | 7,256 | 6,288 | 37,047 | 34,475 | 26,381
Net income (loss) attributable to AXT, Inc. | $ (1,061) | $ 3,939 | $ 3,901 | $ 2,875 | $ 3,134 | $ 4,419 | $ 1,930 | $ 665 | $ 9,654 | $ 10,148 | $ 5,636
Net income (loss) attributable to AXT, Inc. per share, basic (in dollar per share) | $ (0.03) | $ 0.10 | $ 0.10 | $ 0.07 | $ 0.08 | $ 0.11 | $ 0.05 | $ 0.02 | $ 0.24 | $ 0.27 | $ 0.17
Net income (loss) attributable to AXT, Inc. per share, diluted (in dollar per share) | $ (0.03) | $ 0.10 | $ 0.10 | $ 0.07 | $ 0.08 | $ 0.11 | $ 0.05 | $ 0.02 | $ 0.24 | $ 0.26 | $ 0.17

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