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Unaudited Quarterly Consolidated Financial Data (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2021
Sep. 30, 2021
Jun. 30, 2021
Mar. 31, 2021
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Unaudited Quarterly Consolidated Financial Data                      
Revenue $ 37,732 $ 34,576 $ 33,735 $ 31,350 $ 27,035 $ 25,469 $ 22,134 $ 20,723 $ 137,393 $ 95,361 $ 83,256
Gross profit 12,139 11,501 12,238 11,536 9,162 8,823 6,768 5,522 47,414 30,275 24,825
Net income attributable to AXT, Inc. $ 2,965 $ 3,800 $ 4,385 $ 3,425 $ 2,064 $ 991 $ 361 $ (178) $ 14,575 $ 3,238 $ (2,600)
Net income (loss) attributable to AXT, Inc. per share, basic (in dollar per share) $ 0.07 $ 0.09 $ 0.11 $ 0.08 $ 0.05 $ 0.02 $ 0.01 $ (0.01) $ 0.35 $ 0.08 $ (0.07)
Net income (loss) attributable to AXT, Inc. per share, diluted (in dollar per share) $ 0.07 $ 0.09 $ 0.10 $ 0.08 $ 0.05 $ 0.02 $ 0.01 $ (0.01) $ 0.34 $ 0.07 $ (0.07)