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Net Income (Loss) Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Numerator:
Net income (loss) attributable to AXT, Inc	$ 3,134	$ 4,419	$ 1,930	$ 665	$ 2,214	$ 2,229	$ 1,151	$ 42	$ 10,148	$ 5,636	$ (2,228)
Less: Preferred stock dividends									(177)	(177)	(177)
Net income available to common stockholders									$ 9,971	$ 5,459	$ (2,405)
Weighted average number of common shares outstanding:
Denominator for basic net income per share - weighted average common shares (in shares)									37,444	32,139	32,183
Effect of dilutive securities:
Denominator for dilutive net income per common share (in shares)									38,966	32,894	32,183
Basic net income (loss) per share
Net income (loss) attributable to AXT, Inc (in dollars per share)									$ 0.27	$ 0.17	$ (0.07)
Basic (in dollars per share)	$ 0.08	$ 0.11	$ 0.05	$ 0.02	$ 0.07	$ 0.07	$ 0.03	$ 0.00	0.27	0.17	(0.07)
Diluted net income (loss) per share
Net income (loss) attributable to AXT, Inc (in dollars per share)									0.26	0.17	(0.07)
Diluted (in dollars per share)	$ 0.08	$ 0.11	$ 0.05	$ 0.02	$ 0.06	$ 0.07	$ 0.03	$ 0.00	$ 0.26	$ 0.17	$ (0.07)
Options
Effect of dilutive securities:
Effect of dilutive securities (in shares)									1,339	596
Weighted-average shares:
Securities excluded from diluted net income (loss) per share as the impact is anti-dilutive (in shares)									86	779	3,779
Restricted Stock Awards
Effect of dilutive securities:
Effect of dilutive securities (in shares)									183	159
Weighted-average shares:
Securities excluded from diluted net income (loss) per share as the impact is anti-dilutive (in shares)									63	15	546

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