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Net Income per Share (Tables)
 12 Months Ended
Dec. 31, 2014
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,
2014
2013
2012
Numerator:
 
 
 
 
 
 
 
 
 
Net income (loss) attributable to AXT, Inc
$
(1,388
)
$
(7,958
)
$
3,110
 
Less: Preferred stock dividends
 
(177
)
 
(177
)
 
(177
)
Net income (loss) to common stockholders
$
(1,565
)
$
(8,135
)
$
2,933
 
Denominator:
 
 
 
 
 
 
 
 
 
Weighted average common shares (basic)
 
32,452
 
 
32,700
 
 
32,144
 
Effect of dilutive securities:
 
 
 
 
 
 
 
 
 
Common stock options
 
—
 
 
—
 
 
689
 
Restricted stock awards
 
—
 
 
—
 
 
32
 
Weighted average common shares (dilutive)
 
32,452
 
 
32,700
 
 
32,865
 
Basic net income (loss) per share:
 
 
 
 
 
 
 
 
 
Net income attributable to AXT, Inc
$
(0.05
)
$
(0.25
)
$
0.10
 
Net income to common stockholders
$
(0.05
)
$
(0.25
)
$
0.09
 
Diluted net income (loss) per share:
 
 
 
 
 
 
 
 
 
Net income attributable to AXT, Inc
$
(0.05
)
$
(0.25
)
$
0.09
 
Net income to common stockholders
$
(0.05
)
$
(0.25
)
$
0.09
 
Options excluded from diluted net income per share as the impact is anti-dilutive
 
2,772
 
 
2,671
 
 
1,056
 
Restricted stock excluded from diluted net income per share as the impact is anti-dilutive
 
252
 
 
241
 
 
13