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The Company and Summary of Significant Accounting Policies - Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Accumulated other comprehensive income (loss):
Accumulated other comprehensive income (loss) attributable to AXT, Inc.	$ (1,972)	$ 3,407
Accumulated other comprehensive income including noncontrolling interest
Accumulated other comprehensive income (loss):
Unrealized loss on investments, net	(84)	(93)
Cumulative translation adjustment	(1,845)	3,904
Accumulated other comprehensive income (loss) attributable to AXT, Inc.	(1,929)	3,811
Accumulated other comprehensive income attributable to noncontrolling interest
Accumulated other comprehensive income (loss):
Less: Cumulative translation adjustment attributable to noncontrolling interests	$ 43	$ 404

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Amount of cumulative translation adjustment attributable to noncontrolling interests.

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Accumulated unrealized gain (loss), after tax, on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Accumulated adjustment, net of tax, that results from the process of translating subsidiary financial statements and foreign equity investments into the reporting currency from the functional currency of the reporting entity, net of reclassification of realized foreign currency translation gains or losses.

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