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Net income per Share (Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified
3 Months Ended 12 Months Ended
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2011
Sep. 30, 2011
Jun. 30, 2011
Mar. 31, 2011
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Numerator:                      
Net income attributable to AXT, Inc $ (756) $ 932 $ 1,299 $ 1,635 $ 2,566 $ 6,484 $ 7,062 $ 4,208 $ 3,110 $ 20,320 $ 18,653
Less: Preferred stock dividends                 (177) (177) (177)
Net income to common stockholders                 $ 2,933 $ 20,143 $ 18,476
Denominator:                      
Denominator for basic net income per share-weighted average common shares (in shares)                 32,144 31,872 31,008
Effect of Dilutive Securities on Earnings Per Share [Line Items]                      
Denominator for dilutive net income (loss) per share (in shares)                 32,865 33,061 32,512
Basic net income (loss) per share [Abstract]                      
Net income attributable to AXT, Inc (in dollars per share)                 $ 0.1 $ 0.64 $ 0.6
Net income to common stockholders (in dollars per share) $ (0.02) $ 0.03 $ 0.04 $ 0.05 $ 0.08 $ 0.2 $ 0.22 $ 0.13 $ 0.09 $ 0.63 $ 0.6
Diluted net income per share [Abstract]                      
Net income attributable to AXT, Inc (in dollars per share)                 $ 0.09 $ 0.61 $ 0.57
Net income to common stockholders (in dollars per share) $ (0.02) $ 0.03 $ 0.04 $ 0.05 $ 0.08 $ 0.19 $ 0.21 $ 0.13 $ 0.09 $ 0.61 $ 0.57
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)                 13 116 127
Options [Member]
                     
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)                 1,056 478 14
Common stock options [Member]
                     
Effect of Dilutive Securities on Earnings Per Share [Line Items]                      
Effect of dilutive securities (in shares)                 689 1,093 1,380
Restricted stock [Member]
                     
Effect of Dilutive Securities on Earnings Per Share [Line Items]                      
Effect of dilutive securities (in shares)                 32 96 124