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Net Income (loss) Per Share (Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Dec. 31, 2012
Numerator [Abstract]          
Net income (loss) attributable to AXT, Inc. $ (2,295) $ 932 $ (6,730) $ 3,866  
Less: Preferred stock dividends (44) (44) (132) (132)  
Net income (loss) available to common stockholders (2,339) 888 (6,862) 3,734  
Denominator [Abstract]          
Weighted average common shares (basic) (in shares) 32,366 32,183 32,407 32,118  
Effect Of Dilutive Securities On Earnings Per Share [Line Items]          
Weighted average common shares (dilutive) (in shares) 32,366 32,769 32,407 32,911  
Net income (loss) attributable to AXT, Inc. per common share [Abstract]          
Basic (in dollars per share) $ (0.07) $ 0.03 $ (0.21) $ 0.12  
Diluted (in dollars per share) $ (0.07) $ 0.03 $ (0.21) $ 0.11  
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]          
Preferred stock, shares issued (in shares) 883   883   883
Preferred stock, shares outstanding (in shares) 883   883   883
Preferred stock, par value (in dollars per share) $ 0.001   $ 0.001   $ 0.001
Preferred stock, value $ 3,532   $ 3,532   $ 3,532 [1]
Cumulative annual dividend rate (in hundredths)     5.00%   5.00%
Liquidation preference over common stock (in dollars per share) $ 4   $ 4   $ 4
Options [Member]
          
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]          
Securities excluded from diluted net income (loss) per share as the impact is anti-dilutive (in shares) 2,524 992 2,563 977  
Restricted stock awards [Member]
          
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]          
Securities excluded from diluted net income (loss) per share as the impact is anti-dilutive (in shares) 243 172 242 14  
Common stock options [Member]
          
Effect Of Dilutive Securities On Earnings Per Share [Line Items]          
Effect of dilutive securities (in shares) 0 582 0 754  
Restricted stock awards [Member]
          
Effect Of Dilutive Securities On Earnings Per Share [Line Items]          
Effect of dilutive securities (in shares) 0 4 0 39  
[1] The condensed consolidated balance sheet at December 31, 2012 has been derived from the audited consolidated financial statements at that date.