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Net Income Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended			6 Months Ended		12 Months Ended
	Jun. 30, 2019	Mar. 31, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018
Numerator:
Net income attributable to AXT, Inc.	$ 1,451		$ 3,901	$ 347	$ 6,776
Less: Preferred stock dividends	(44)		(44)	(88)	(88)
Net income available to common stockholders	$ 1,407		$ 3,857	$ 259	$ 6,688
Weighted-average number of common shares outstanding:
Denominator for basic net income per share - weighted-average common shares	39,447,000		39,001,000	39,399,000	38,970,000
Effect of dilutive securities:
Denominator for dilutive net income (loss) per common share (in shares)	40,123,000		40,216,000	40,045,000	40,289,000
Net income attributable to AXT, Inc. per common share:
Basic	$ 0.04		$ 0.10	$ 0.01	$ 0.17
Diluted	$ 0.04		$ 0.10	$ 0.01	$ 0.17
Preferred stock, shares issued (in shares)	883,000			883,000		883,000
Preferred stock, shares outstanding (in shares)	883,000			883,000		883,000
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 (as a percent)		5.00%		5.00%		5.00%
Liquidation preference over common stock (in dollars per share)	$ 4			$ 4		$ 4
Options
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Securities excluded from diluted net income per share as the impact is anti-dilutive (in shares)	1,280,000		228,000	1,284,000	186,000
Restricted Stock Awards
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Securities excluded from diluted net income per share as the impact is anti-dilutive (in shares)	568,000		249,000	550,000	240,000
Options
Effect of dilutive securities:
Effect of dilutive securities (in shares)	624,000		1,094,000	602,000	1,191,000
Restricted Stock Awards
Effect of dilutive securities:
Effect of dilutive securities (in shares)	52,000		121,000	44,000	128,000

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