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Net Income (loss) Per Share (Tables)
 3 Months Ended
Mar. 31, 2014
Net Income (loss) Per Share [Abstract]  
Reconciliation of numerators and denominators of basic and diluted net income (loss) per share
A reconciliation of the numerators and denominators of the basic and diluted net loss per share calculations is as follows (in thousands, except per share data):
 
 
Three Months Ended
March 31,
 
 
2014
  
2013
 
Numerator:
    
Net loss attributable to AXT, Inc.
 
$
(2,040
)
 
$
(2,400
)
Less: Preferred stock dividends
  
(44
)
  
(44
)
        
Net loss available to common stockholders
 
$
(2,084
)
 
$
(2,444
)
Denominator:
        
Denominator for basic net loss per share - weighted average common shares
  
32,364
   
32,297
 
Effect of dilutive securities:
        
 Common stock options
  
—
   
—
 
Restricted stock awards
  
—
   
—
 
Denominator for dilutive net loss per common share
  
32,364
   
32,297
 
Net loss attributable to AXT, Inc. per common share:
        
Basic
 
$
(0.06
)
 
$
(0.08
)
Diluted
 
$
(0.06
)
 
$
(0.08
)
Weighted-average shares:
Options excluded from diluted net loss per share as the impact is anti-dilutive
  
2,607
   
2,656
 
Restricted stock excluded from diluted net loss per share as the impact is anti-dilutive
  
241
   
239