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Net Income (Loss) Per Share (Tables)
 6 Months Ended
Jun. 30, 2015
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
June 30,
  
Six Months Ended
June 30,
 
  
2015
  
2014
  
2015
  
2014
 
Numerator:
        
Net income (loss) attributable to AXT, Inc.
 
$
(3
)
 
$
319
  
$
(1,027
)
 
$
(1,721
)
Less: Preferred stock dividends
  
(44
)
  
(44
)
  
(88
)
  
(88
)
                 
Net income (loss) available to common stockholders
 
$
(47
)
 
$
275
  
$
(1,115
)
 
$
(1,809
)
Denominator:
                
Denominator for basic net income (loss) per share - weighted average common shares
  
32,242
   
32,381
   
32,399
   
32,407
 
Effect of dilutive securities:
                
Common stock options
  
—
   
195
   
—
   
—
 
Restricted stock awards
  
—
   
22
   
—
   
—
 
Denominator for dilutive net income (loss) per common share
  
32,242
   
32,597
   
32,399
   
32,407
 
Net income (loss) attributable to AXT, Inc. per common share:
                
Basic
 
$
(0.00
)  
$
0.01
  
$
(0.03
)
 
$
(0.06
)
Diluted
 
$
(0.00
)  
$
0.01
  
$
(0.03
)
 
$
(0.06
)
Options excluded from diluted net income (loss)  per share as the impact is anti-dilutive
  
3,102
   
1,782
   
3,102
   
2,645
 
Restricted stock excluded from diluted net income (loss) per share as the impact is anti-dilutive
  
466
   
93
   
466
   
266