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Unaudited Quarterly Consolidated Financial Data (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Unaudited Quarterly Consolidated Financial Data [Abstract]
Revenue	$ 19,567us-gaap_Revenues	$ 23,138us-gaap_Revenues	$ 21,449us-gaap_Revenues	$ 19,345us-gaap_Revenues	$ 18,603us-gaap_Revenues	$ 20,521us-gaap_Revenues	$ 22,831us-gaap_Revenues	$ 22,380us-gaap_Revenues	$ 83,499us-gaap_Revenues	$ 85,335us-gaap_Revenues	$ 88,374us-gaap_Revenues
Gross Profit	4,971us-gaap_GrossProfit	5,318us-gaap_GrossProfit	4,160us-gaap_GrossProfit	2,718us-gaap_GrossProfit	2,813us-gaap_GrossProfit	2,446us-gaap_GrossProfit	3,085us-gaap_GrossProfit	3,484us-gaap_GrossProfit	17,167us-gaap_GrossProfit	11,828us-gaap_GrossProfit	24,852us-gaap_GrossProfit
Net income (loss) attributable to AXT, Inc	$ (311)us-gaap_NetIncomeLoss	$ 644us-gaap_NetIncomeLoss	$ 319us-gaap_NetIncomeLoss	$ (2,040)us-gaap_NetIncomeLoss	$ (1,228)us-gaap_NetIncomeLoss	$ (2,295)us-gaap_NetIncomeLoss	$ (2,035)us-gaap_NetIncomeLoss	$ (2,400)us-gaap_NetIncomeLoss	$ (1,388)us-gaap_NetIncomeLoss	$ (7,958)us-gaap_NetIncomeLoss	$ 3,110us-gaap_NetIncomeLoss
Net (loss) attributable to AXT, Inc per share, basic (in dollar per share)	$ (0.01)us-gaap_EarningsPerShareBasic	$ 0.02us-gaap_EarningsPerShareBasic	$ 0.01us-gaap_EarningsPerShareBasic	$ (0.06)us-gaap_EarningsPerShareBasic	$ (0.04)us-gaap_EarningsPerShareBasic	$ (0.07)us-gaap_EarningsPerShareBasic	$ (0.06)us-gaap_EarningsPerShareBasic	$ (0.08)us-gaap_EarningsPerShareBasic	$ (0.05)us-gaap_EarningsPerShareBasic	$ (0.25)us-gaap_EarningsPerShareBasic	$ 0.09us-gaap_EarningsPerShareBasic
Net (loss) attributable to AXT, Inc per share, diluted (in dollar per share)	$ (0.01)us-gaap_EarningsPerShareDiluted	$ 0.02us-gaap_EarningsPerShareDiluted	$ 0.01us-gaap_EarningsPerShareDiluted	$ (0.06)us-gaap_EarningsPerShareDiluted	$ (0.04)us-gaap_EarningsPerShareDiluted	$ (0.07)us-gaap_EarningsPerShareDiluted	$ (0.06)us-gaap_EarningsPerShareDiluted	$ (0.08)us-gaap_EarningsPerShareDiluted	$ (0.05)us-gaap_EarningsPerShareDiluted	$ (0.25)us-gaap_EarningsPerShareDiluted	$ 0.09us-gaap_EarningsPerShareDiluted

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