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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, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Numerator:
Net income (loss) attributable to AXT, Inc.	$ (1,061)	$ 3,939	$ 3,901	$ 2,875	$ 3,134	$ 4,419	$ 1,930	$ 665	$ 9,654	$ 10,148	$ 5,636
Less: Preferred stock dividends									(177)	(177)	(177)
Net income available to common stockholders									$ 9,477	$ 9,971	$ 5,459
Weighted-average number of common shares outstanding:
Denominator for basic net income per share - weighted-average common shares (in shares)									39,049	37,444	32,139
Effect of dilutive securities:
Denominator for dilutive net income per common share (in shares)									40,265	38,966	32,894
Basic net income per share:
Net income attributable to AXT, Inc. (in dollars per share)									$ 0.24	$ 0.27	$ 0.17
Basic (in dollars per share)	$ (0.03)	$ 0.10	$ 0.10	$ 0.07	$ 0.08	$ 0.11	$ 0.05	$ 0.02	0.24	0.27	0.17
Diluted net income per share:
Net income attributable to AXT, Inc (in dollars per share)									0.24	0.26	0.17
Diluted (in dollars per share)	$ (0.03)	$ 0.10	$ 0.10	$ 0.07	$ 0.08	$ 0.11	$ 0.05	$ 0.02	$ 0.24	$ 0.26	$ 0.17
Options
Effect of dilutive securities:
Effect of dilutive securities (in shares)									1,106	1,339	596
Weighted-average shares:
Securities excluded from diluted net income per share as the impact is anti-dilutive (in shares)									266	86	779
Restricted Stock Awards
Effect of dilutive securities:
Effect of dilutive securities (in shares)									110	183	159
Weighted-average shares:
Securities excluded from diluted net income per share as the impact is anti-dilutive (in shares)									227	63	15

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