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Net Income (Loss) Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014	Dec. 31, 2014
Numerator: [Abstract]
Net income (loss) attributable to AXT, Inc.	$ (3)	$ 319	$ (1,027)	$ (1,721)
Less: Preferred stock dividends	(44)	(44)	(88)	(88)
Net loss available to common stockholders	$ (47)	$ 275	$ (1,115)	$ (1,809)
Denominator: [Abstract]
Denominator for basic net loss per share - weighted average common shares (in shares)	32,242	32,381	32,399	32,407
Effect Of Dilutive Securities On Earnings Per Share [Line Items]
Denominator for dilutive net (income) loss per common share (in shares)	32,242	32,597	32,399	32,407
Net income (loss) attributable to AXT, Inc. per common share:
Basic (in dollars per share)	$ 0	$ 0.01	$ (0.03)	$ (0.06)
Diluted (in dollars per share)	$ 0	$ 0.01	$ (0.03)	$ (0.06)
Weighted-average shares: [Abstract]
Preferred stock, shares issued (in shares)	883		883		883
Preferred stock, shares outstanding (in shares)	883		883		883
Preferred stock, par value (in dollars per share)	$ 0.001		$ 0.001		$ 0.001
Preferred stock, value	$ 3,532		$ 3,532		$ 3,532
Cumulative annual dividend rate (in hundredths)			5.00%		5.00%
Liquidation preference over common stock (in dollars per share)	$ 4		$ 4		$ 4
Options [Member]
Effect Of Dilutive Securities On Earnings Per Share [Line Items]
Effect of dilutive securities (in shares)	0	195	0	0
Restricted Stock Awards [Member]
Effect Of Dilutive Securities On Earnings Per Share [Line Items]
Effect of dilutive securities (in shares)	0	22	0	0
Options [Member]
Weighted-average shares: [Abstract]
Securities excluded from diluted net income (loss) per share as the impact is anti-dilutive (in shares)	3,102	1,782	3,102	2,645
Restricted Stock Awards [Member]
Weighted-average shares: [Abstract]
Securities excluded from diluted net income (loss) per share as the impact is anti-dilutive (in shares)	466	93	466	266

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