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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME [Abstract]
Net Income (loss)	$ (697)us-gaap_ProfitLoss	$ (6,813)us-gaap_ProfitLoss	$ 6,150us-gaap_ProfitLoss
Other comprehensive income (loss), net of tax:
Change in cumulative foreign currency translation adjustment, net of tax	(377)us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossArisingDuringPeriodNetOfTax	1,568us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossArisingDuringPeriodNetOfTax	207us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossArisingDuringPeriodNetOfTax
Change in unrealized gain (loss) on available-for-sale investments, net of tax	(964)us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	1,682us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	85us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax
Total other comprehensive income (loss), net of tax	(1,341)us-gaap_OtherComprehensiveIncomeLossNetOfTax	3,250us-gaap_OtherComprehensiveIncomeLossNetOfTax	292us-gaap_OtherComprehensiveIncomeLossNetOfTax
Comprehensive income (loss)	(2,038)us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	(3,563)us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	6,442us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest
Less: Comprehensive income attributable to the noncontrolling interest	(630)us-gaap_ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest	(1,475)us-gaap_ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest	(3,117)us-gaap_ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest
Comprehensive income (loss) attributable to AXT, Inc.	$ (2,668)us-gaap_ComprehensiveIncomeNetOfTax	$ (5,038)us-gaap_ComprehensiveIncomeNetOfTax	$ 3,325us-gaap_ComprehensiveIncomeNetOfTax

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