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Net Income per Share (Tables)
 12 Months Ended
Dec. 31, 2013
Net Income 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 per share calculations is as follows (in thousands, except per share data):
 
 
 
Years Ended December 31,
 
 
 
2013
  
2012
  
2011
 
Numerator:
 
  
  
 
Net income (loss) attributable to AXT, Inc
 
$
(7,958
)
 
$
3,110
  
$
20,320
 
Less: Preferred stock dividends
  
(177
)
  
(177
)
  
(177
)
Net income (loss) to common stockholders
 
$
(8,135
)
 
$
2,933
  
$
20,143
 
Denominator:
            
Weighted average common shares (basic)
  
32,700
   
32,144
   
31,872
 
Effect of dilutive securities:
            
Common stock options
  
—
   
689
   
1,093
 
Restricted stock awards
  
—
   
32
   
96
 
Weighted average common shares (dilutive)
  
32,700
   
32,865
   
33,061
 
Basic net income (loss) per share:
            
Net income attributable to AXT, Inc
 
$
(0.25
)
 
$
0.10
  
$
0.64
 
Net income to common stockholders
 
$
(0.25
)
 
$
0.09
  
$
0.63
 
Diluted net income (loss) per share:
            
Net income attributable to AXT, Inc
 
$
(0.25
)
 
$
0.09
  
$
0.61
 
Net income to common stockholders
 
$
(0.25
)
 
$
0.09
  
$
0.61
 
Options excluded from diluted net income per share as the impact is anti-dilutive
  
2,671
   
1,056
   
478
 
Restricted stock excluded from diluted net income per share as the impact is anti-dilutive
  
241
   
13
   
116