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Investments in Privately-held Companies (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Aug. 31, 2011 EquityMethodInvestee
Summary of investments [Abstract]
Income allocated to minority interests	$ 691,000us-gaap_NetIncomeLossAttributableToNoncontrollingInterest	$ 1,145,000us-gaap_NetIncomeLossAttributableToNoncontrollingInterest	$ 3,040,000us-gaap_NetIncomeLossAttributableToNoncontrollingInterest
Equity investments classified as other assets	14,975,000us-gaap_OtherAssetsNoncurrent	14,801,000us-gaap_OtherAssetsNoncurrent
Beijing JiYa Semiconductor Material Co Ltd [Member]
Summary of investments [Abstract]
Number of employees who are also members of the board	2axti_NumberOfEmployeesAreAlsoMembersOfTheBoard / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = axti_BeijingJiyaSemiconductorMaterialCoLtdMember
Number of equity investment entities				1axti_NumberOfEquityInvestmentEntities / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = axti_BeijingJiyaSemiconductorMaterialCoLtdMember
Nanjing Jin Mei Gallium Co Ltd [Member]
Summary of investments [Abstract]
Number of employees who are also members of the board	2axti_NumberOfEmployeesAreAlsoMembersOfTheBoard / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = axti_NanjingJinMeiGalliumCoLtdMember
Beijing Tongmei Xtal Technology [Member]
Summary of investments [Abstract]
Number of equity investment entities	1axti_NumberOfEquityInvestmentEntities / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = axti_BeijingTongmeiXtalTechnologyMember
Beijing BoYu Semiconductor Vessel Craftwork Technology Co Ltd [Member]
Summary of investments [Abstract]
Number of employees who are also members of the board	2axti_NumberOfEmployeesAreAlsoMembersOfTheBoard / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = axti_BeijingBoyuSemiconductorVesselCraftworkTechnologyCoLtdMember
AXT, Inc [Member]
Summary of investments [Abstract]
Gross equity earnings (losses) from minority-owned joint ventures that are not consolidated, recorded as other income	6,765,000us-gaap_EquityMethodInvestmentSummarizedFinancialInformationNetIncomeLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_ParentMember	6,315,000us-gaap_EquityMethodInvestmentSummarizedFinancialInformationNetIncomeLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_ParentMember	5,665,000us-gaap_EquityMethodInvestmentSummarizedFinancialInformationNetIncomeLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_ParentMember
Equity Method Investments [Member]
Summary of investments [Abstract]
Equity Method Investment by Parent	8,095,000axti_EquityMethodInvestmentByParent / us-gaap_StatementEquityComponentsAxis = us-gaap_EquityMethodInvestmentsMember	7,537,000axti_EquityMethodInvestmentByParent / us-gaap_StatementEquityComponentsAxis = us-gaap_EquityMethodInvestmentsMember
Number of equity investment entities	3axti_NumberOfEquityInvestmentEntities / us-gaap_StatementEquityComponentsAxis = us-gaap_EquityMethodInvestmentsMember	3axti_NumberOfEquityInvestmentEntities / us-gaap_StatementEquityComponentsAxis = us-gaap_EquityMethodInvestmentsMember	3axti_NumberOfEquityInvestmentEntities / us-gaap_StatementEquityComponentsAxis = us-gaap_EquityMethodInvestmentsMember
Gross equity earnings (losses) from minority-owned joint ventures that are not consolidated, recorded as other income	569,000us-gaap_EquityMethodInvestmentSummarizedFinancialInformationNetIncomeLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_EquityMethodInvestmentsMember	270,000us-gaap_EquityMethodInvestmentSummarizedFinancialInformationNetIncomeLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_EquityMethodInvestmentsMember	379,000us-gaap_EquityMethodInvestmentSummarizedFinancialInformationNetIncomeLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_EquityMethodInvestmentsMember
Net income generated by all joint ventures, consolidated and equity method investments	2,900,000axti_NetIncomeLossFromConsolidatedJointVenturesAndEquityMethodInvesteesAttributableToParent / us-gaap_StatementEquityComponentsAxis = us-gaap_EquityMethodInvestmentsMember	2,600,000axti_NetIncomeLossFromConsolidatedJointVenturesAndEquityMethodInvesteesAttributableToParent / us-gaap_StatementEquityComponentsAxis = us-gaap_EquityMethodInvestmentsMember	4,700,000axti_NetIncomeLossFromConsolidatedJointVenturesAndEquityMethodInvesteesAttributableToParent / us-gaap_StatementEquityComponentsAxis = us-gaap_EquityMethodInvestmentsMember
Equity investments classified as other assets	8,100,000us-gaap_OtherAssetsNoncurrent / us-gaap_StatementEquityComponentsAxis = us-gaap_EquityMethodInvestmentsMember	7,500,000us-gaap_OtherAssetsNoncurrent / us-gaap_StatementEquityComponentsAxis = us-gaap_EquityMethodInvestmentsMember
Minority investment in consolidated joint venture, included in other assets	4,000,000us-gaap_MinorityInterestInJointVentures / us-gaap_StatementEquityComponentsAxis = us-gaap_EquityMethodInvestmentsMember	3,400,000us-gaap_MinorityInterestInJointVentures / us-gaap_StatementEquityComponentsAxis = us-gaap_EquityMethodInvestmentsMember
Joint Ventures [Member]
Summary of investments [Abstract]
Number of consolidated joint ventures	3axti_NumberOfConsolidatedJointVentures / us-gaap_StatementEquityComponentsAxis = us-gaap_CorporateJointVentureMember	3axti_NumberOfConsolidatedJointVentures / us-gaap_StatementEquityComponentsAxis = us-gaap_CorporateJointVentureMember	3axti_NumberOfConsolidatedJointVentures / us-gaap_StatementEquityComponentsAxis = us-gaap_CorporateJointVentureMember
Income from three consolidated joint ventures	3,000,000axti_IncomeLossFromConsolidatedJointVentures / us-gaap_StatementEquityComponentsAxis = us-gaap_CorporateJointVentureMember	3,500,000axti_IncomeLossFromConsolidatedJointVentures / us-gaap_StatementEquityComponentsAxis = us-gaap_CorporateJointVentureMember	7,400,000axti_IncomeLossFromConsolidatedJointVentures / us-gaap_StatementEquityComponentsAxis = us-gaap_CorporateJointVentureMember
Income allocated to minority interests	691,000us-gaap_NetIncomeLossAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_CorporateJointVentureMember	1,100,000us-gaap_NetIncomeLossAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_CorporateJointVentureMember	3,000,000us-gaap_NetIncomeLossAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_CorporateJointVentureMember
Net income from joint ventures attributable to parent	2,300,000axti_NetIncomeLossFromJointVenturesAttributableToParent / us-gaap_StatementEquityComponentsAxis = us-gaap_CorporateJointVentureMember	2,400,000axti_NetIncomeLossFromJointVenturesAttributableToParent / us-gaap_StatementEquityComponentsAxis = us-gaap_CorporateJointVentureMember	4,400,000axti_NetIncomeLossFromJointVenturesAttributableToParent / us-gaap_StatementEquityComponentsAxis = us-gaap_CorporateJointVentureMember
Majority-owned Subsidiaries [Member]
Summary of investments [Abstract]
Investments, consolidated	5,269,000axti_InvestmentsInJointVenturesConsolidated / us-gaap_StatementEquityComponentsAxis = us-gaap_SubsidiariesMember	5,269,000axti_InvestmentsInJointVenturesConsolidated / us-gaap_StatementEquityComponentsAxis = us-gaap_SubsidiariesMember
Minority Investment Entities [Member]
Summary of investments [Abstract]
Gross equity earnings (losses) from minority-owned joint ventures that are not consolidated, recorded as other income	1,528,000us-gaap_EquityMethodInvestmentSummarizedFinancialInformationNetIncomeLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_AffiliatedEntityMember	1,377,000us-gaap_EquityMethodInvestmentSummarizedFinancialInformationNetIncomeLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_AffiliatedEntityMember	1,281,000us-gaap_EquityMethodInvestmentSummarizedFinancialInformationNetIncomeLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_AffiliatedEntityMember
Beijing JiYa Semiconductor Material Co., Ltd [Member] | Majority-owned Subsidiaries [Member]
Summary of investments [Abstract]
Investments, consolidated	3,331,000axti_InvestmentsInJointVenturesConsolidated / dei_LegalEntityAxis = axti_BeijingJiyaSemiconductorMaterialCoLtdMember / us-gaap_StatementEquityComponentsAxis = us-gaap_SubsidiariesMember	3,331,000axti_InvestmentsInJointVenturesConsolidated / dei_LegalEntityAxis = axti_BeijingJiyaSemiconductorMaterialCoLtdMember / us-gaap_StatementEquityComponentsAxis = us-gaap_SubsidiariesMember
Percentage of ownership, consolidated method (in hundredths)	46.00%us-gaap_VariableInterestEntityOwnershipPercentage / dei_LegalEntityAxis = axti_BeijingJiyaSemiconductorMaterialCoLtdMember / us-gaap_StatementEquityComponentsAxis = us-gaap_SubsidiariesMember
Nanjing Jin Mei Gallium Co., Ltd [Member] | Majority-owned Subsidiaries [Member]
Summary of investments [Abstract]
Investments, consolidated	592,000axti_InvestmentsInJointVenturesConsolidated / dei_LegalEntityAxis = axti_NanjingJinMeiGalliumCoLtdMember / us-gaap_StatementEquityComponentsAxis = us-gaap_SubsidiariesMember	592,000axti_InvestmentsInJointVenturesConsolidated / dei_LegalEntityAxis = axti_NanjingJinMeiGalliumCoLtdMember / us-gaap_StatementEquityComponentsAxis = us-gaap_SubsidiariesMember
Percentage of ownership, consolidated method (in hundredths)	83.00%us-gaap_VariableInterestEntityOwnershipPercentage / dei_LegalEntityAxis = axti_NanjingJinMeiGalliumCoLtdMember / us-gaap_StatementEquityComponentsAxis = us-gaap_SubsidiariesMember
Beijing BoYu Semiconductor Vessel Craftwork Technology Co., Ltd [Member] | Majority-owned Subsidiaries [Member]
Summary of investments [Abstract]
Investments, consolidated	1,346,000axti_InvestmentsInJointVenturesConsolidated / dei_LegalEntityAxis = axti_BeijingBoyuSemiconductorVesselCraftworkTechnologyCoLtdMember / us-gaap_StatementEquityComponentsAxis = us-gaap_SubsidiariesMember	1,346,000axti_InvestmentsInJointVenturesConsolidated / dei_LegalEntityAxis = axti_BeijingBoyuSemiconductorVesselCraftworkTechnologyCoLtdMember / us-gaap_StatementEquityComponentsAxis = us-gaap_SubsidiariesMember
Percentage of ownership, consolidated method (in hundredths)	70.00%us-gaap_VariableInterestEntityOwnershipPercentage / dei_LegalEntityAxis = axti_BeijingBoyuSemiconductorVesselCraftworkTechnologyCoLtdMember / us-gaap_StatementEquityComponentsAxis = us-gaap_SubsidiariesMember
Xilingol Tongli Germanium Co. Ltd [Member] | Equity Method Investments [Member]
Summary of investments [Abstract]
Equity Method Investment by Parent	5,351,000axti_EquityMethodInvestmentByParent / dei_LegalEntityAxis = axti_XilingolTongliGermaniumCoLtdMember / us-gaap_StatementEquityComponentsAxis = us-gaap_EquityMethodInvestmentsMember	4,692,000axti_EquityMethodInvestmentByParent / dei_LegalEntityAxis = axti_XilingolTongliGermaniumCoLtdMember / us-gaap_StatementEquityComponentsAxis = us-gaap_EquityMethodInvestmentsMember
Percentage of ownership, equity method (in hundredths)	25.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / dei_LegalEntityAxis = axti_XilingolTongliGermaniumCoLtdMember / us-gaap_StatementEquityComponentsAxis = us-gaap_EquityMethodInvestmentsMember
Donghai County Dongfang High Purity Electronic Materials Co., Ltd [Member] | Equity Method Investments [Member]
Summary of investments [Abstract]
Equity Method Investment by Parent	1,723,000axti_EquityMethodInvestmentByParent / dei_LegalEntityAxis = axti_DonghaiCountyDongfangHighPurityElectronicMaterialsCoLtdMember / us-gaap_StatementEquityComponentsAxis = us-gaap_EquityMethodInvestmentsMember	1,900,000axti_EquityMethodInvestmentByParent / dei_LegalEntityAxis = axti_DonghaiCountyDongfangHighPurityElectronicMaterialsCoLtdMember / us-gaap_StatementEquityComponentsAxis = us-gaap_EquityMethodInvestmentsMember
Percentage of ownership, equity method (in hundredths)	46.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / dei_LegalEntityAxis = axti_DonghaiCountyDongfangHighPurityElectronicMaterialsCoLtdMember / us-gaap_StatementEquityComponentsAxis = us-gaap_EquityMethodInvestmentsMember
Emeishan Jia Mei High Purity Metals Co., Ltd [Member] | Equity Method Investments [Member]
Summary of investments [Abstract]
Equity Method Investment by Parent	$ 1,021,000axti_EquityMethodInvestmentByParent / dei_LegalEntityAxis = axti_EmeishanJiaMeiHighPurityMetalsCoLtdMember / us-gaap_StatementEquityComponentsAxis = us-gaap_EquityMethodInvestmentsMember	$ 945,000axti_EquityMethodInvestmentByParent / dei_LegalEntityAxis = axti_EmeishanJiaMeiHighPurityMetalsCoLtdMember / us-gaap_StatementEquityComponentsAxis = us-gaap_EquityMethodInvestmentsMember
Percentage of ownership, equity method (in hundredths)	25.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / dei_LegalEntityAxis = axti_EmeishanJiaMeiHighPurityMetalsCoLtdMember / us-gaap_StatementEquityComponentsAxis = us-gaap_EquityMethodInvestmentsMember

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