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Net Income (loss) Per Share (Tables)
 6 Months Ended
Jun. 30, 2013
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 income (loss) per share calculations is as follows (in thousands, except per share data):

 
 
Three Months Ended
  
Six Months Ended
 
 
 
June 30,
  
June 30,
 
 
 
2013
  
2012
  
2013
  
2012
 
Numerator:
 
  
  
  
 
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:
                
Denominator for basic net income (loss) per share - weighted average common shares
  
32,382
   
32,138
   
32,340
   
32,086
 
Effect of dilutive securities:
                
Common stock options
  
—
   
774
   
—
   
838
 
Restricted stock awards
  
—
   
32
   
—
   
57
 
Denominator for dilutive net income (loss) per common share
  
32,382
   
32,944
   
32,340
   
32,981
 
Net income (loss) attributable to AXT, Inc. per common share:
                
Basic
 
$
(0.06
)
 
$
0.04
  
$
(0.14
)
 
$
0.09
 
Diluted
 
$
(0.06
)
 
$
0.04
  
$
(0.14
)
 
$
0.09
 
Options excluded from diluted net income (loss)  per share as the impact is anti-dilutive
  
2,509
   
997
   
2,583
   
907
 
Restricted stock excluded from diluted net income (loss) per share as the impact is anti-dilutive
  
246
   
14
   
242
   
15