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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, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Numerator: [Abstract]                      
Net income (loss) attributable to AXT, Inc. $ (1,243) $ 42 $ (3) $ (1,024) $ (311) $ 644 $ 319 $ (2,040) $ (2,228) $ (1,388) $ (7,958)
Less: Preferred stock dividends                 (177) (177) (177)
Net income (loss) available to common stockholders                 $ (2,405) $ (1,565) $ (8,135)
Denominator: [Abstract]                      
Denominator for basic net income (loss) per share - weighted average common shares (in shares)                 32,183 32,452 32,700
Denominator for dilutive net income (loss) per common share (in shares)                 32,183 32,452 32,700
Basic net income (loss) per share [Abstract]                      
Net income attributable to AXT, Inc (in dollars per share)                 $ (0.07) $ (0.05) $ (0.25)
Basic (in dollars per share) $ (0.04) $ 0.00 $ 0.00 $ (0.03) $ (0.01) $ 0.02 $ 0.01 $ (0.06) (0.07) (0.05) (0.25)
Diluted net income (loss) per share [Abstract]                      
Net income attributable to AXT, Inc (in dollars per share)                 (0.07) (0.05) (0.25)
Diluted (in dollars per share) $ (0.04) $ 0.00 $ 0.00 $ (0.03) $ (0.01) $ 0.02 $ 0.01 $ (0.06) $ (0.07) $ (0.05) $ (0.25)
Weighted-average shares: [Abstract]                      
Securities excluded from diluted net income (loss) per share as the impact is anti-dilutive (in shares)                 546 252 241
Options [Member]                      
Weighted-average shares: [Abstract]                      
Securities excluded from diluted net income (loss) per share as the impact is anti-dilutive (in shares)                 3,779 2,772 2,671