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Net Income (loss) Per Share (Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Dec. 31, 2012
Numerator [Abstract]          
Net income (loss) attributable to AXT, Inc. $ (2,035) $ 1,299 $ (4,435) $ 2,934  
Less: Preferred stock dividends (44) (44) (88) (88)  
Net income (loss) available to common stockholders (2,079) 1,255 (4,523) 2,846  
Denominator [Abstract]          
Denominator for basic net income (loss) per share-weighted average common shares (in shares) 32,382 32,138 32,340 32,086  
Effect Of Dilutive Securities On Earnings Per Share [Line Items]          
Denominator for dilutive net income (loss) per common share (in shares) 32,382 32,944 32,340 32,981  
Net income (loss) attributable to AXT, Inc. per common share [Abstract]          
Basic (in dollars per share) $ (0.06) $ 0.04 $ (0.14) $ 0.09  
Diluted (in dollars per share) $ (0.06) $ 0.04 $ (0.14) $ 0.09  
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) 2,509 997 2,583 907  
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) 246 14 242 15  
Common stock options [Member]
          
Effect Of Dilutive Securities On Earnings Per Share [Line Items]          
Effect of dilutive securities (in shares) 0 774 0 838  
Restricted stock awards [Member]
          
Effect Of Dilutive Securities On Earnings Per Share [Line Items]          
Effect of dilutive securities (in shares) 0 32 0 57  
[1] The condensed consolidated balance sheet at December 31, 2012 has been derived from the audited consolidated financial statements at that date.