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The Company and Summary of Significant Accounting Policies - Comprehensive Income (loss) (Details) - USD ($) $ in Thousands | Dec. 31, 2023 | Dec. 31, 2022
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Accumulated other comprehensive loss: |  |
Accumulated other comprehensive income (loss) attributable to AXT, Inc. | $ (5,999) | $ (3,118)
Accumulated other comprehensive income including noncontrolling interest |  |
Accumulated other comprehensive loss: |  |
Unrealized loss on investments, net | (20) | (303)
Cumulative translation adjustment | (6,530) | (3,042)
Accumulated other comprehensive income (loss) attributable to AXT, Inc. | (6,550) | (3,345)
Accumulated other comprehensive income attributable to noncontrolling interest |  |
Accumulated other comprehensive loss: |  |
Less: Cumulative translation adjustment attributable to noncontrolling interests and redeemable noncontrolling interests | $ (551) | $ (227)

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