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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, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Numerator:
Net income (loss) attributable to AXT, Inc.	$ 2,214	$ 2,229	$ 1,151	$ 42	$ (1,243)	$ 42	$ (3)	$ (1,024)	$ 5,636	$ (2,228)	$ (1,388)
Less: Preferred stock dividends									(177)	(177)	(177)
Net income (loss) available to common stockholders									$ 5,459	$ (2,405)	$ (1,565)
Denominator:
Denominator for basic net income (loss) per share - weighted average common shares (in shares)									32,139	32,183	32,452
Effect of dilutive securities:
Denominator for dilutive net income (loss) per common share (in shares)									32,894	32,183	32,452
Basic net income (loss) per share
Net income (loss) attributable to AXT, Inc (in dollars per share)									$ 0.17	$ (0.07)	$ (0.05)
Basic (in dollars per share)	$ 0.07	$ 0.07	$ 0.03	$ 0.00	$ (0.04)	$ 0.00	$ 0.00	$ (0.03)	0.17	(0.07)	(0.05)
Diluted net income (loss) per share
Net income (loss) attributable to AXT, Inc (in dollars per share)									0.17	(0.07)	(0.05)
Diluted (in dollars per share)	$ 0.06	$ 0.07	$ 0.03	$ 0.00	$ (0.04)	$ 0.00	$ 0.00	$ (0.03)	$ 0.17	$ (0.07)	$ (0.05)
Options [Member]
Effect of dilutive securities:
Effect of dilutive securities (in shares)									596
Weighted-average shares:
Securities excluded from diluted net income (loss) per share as the impact is anti-dilutive (in shares)									779	3,779	2,772
Restricted Stock Awards [Member]
Effect of dilutive securities:
Effect of dilutive securities (in shares)									159
Weighted-average shares:
Securities excluded from diluted net income (loss) per share as the impact is anti-dilutive (in shares)									15	546	252

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