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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, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Dec. 31, 2013
Numerator [Abstract]          
Net income (loss) attributable to AXT, Inc. $ 319 $ (2,035) $ (1,721) $ (4,435)  
Less: Preferred stock dividends (44) (44) (88) (88)  
Net income (loss) available to common stockholders 275 (2,079) (1,809) (4,523)  
Denominator [Abstract]          
Denominator for basic net income (loss) per share - weighted average common shares (in shares) 32,381 32,382 32,407 32,340  
Effect Of Dilutive Securities On Earnings Per Share [Line Items]          
Denominator for dilutive net income (loss) per common share (in shares) 32,597 32,382 32,407 32,340  
Net loss attributable to AXT, Inc. per common share [Abstract]          
Basic (in dollars per share) $ 0.01 $ (0.06) $ (0.06) $ (0.14)  
Diluted (in dollars per share) $ 0.01 $ (0.06) $ (0.06) $ (0.14)  
Weighted-average shares [Abstract]          
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]
          
Weighted-average shares [Abstract]          
Securities excluded from diluted net loss per share as the impact is anti-dilutive (in shares) 1,782 2,509 2,619 2,583  
Restricted stock awards [Member]
          
Weighted-average shares [Abstract]          
Securities excluded from diluted net loss per share as the impact is anti-dilutive (in shares) 93 246 248 242  
Common stock options [Member]
          
Effect Of Dilutive Securities On Earnings Per Share [Line Items]          
Effect of dilutive securities (in shares) 194 0 0 0  
Restricted stock awards [Member]
          
Effect Of Dilutive Securities On Earnings Per Share [Line Items]          
Effect of dilutive securities (in shares) 22 0 0 0  
[1] Derived from the audited consolidated financial statements included in the Annual Report on Form 10-K filed with the SEC for the year ended December 31, 2013