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Net Income Per Share (Tables)
 6 Months Ended
Jun. 30, 2012
Net Income Per Share [Abstract]  
Reconciliation of Numerator and Denominator in Income 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):

Three Months Ended
Six Months Ended
June 30,
June 30,
2012
2011
2012
2011
Numerator:
Net income attributable to AXT, Inc.
$
1,299
$
7,062
$
2,934
$
11,270
Less: Preferred stock dividends
(44
)
(44
)
(88
)
(88
)
Net income available to common stockholders
$
1,255
$
7,018
$
2,846
$
11,182
Denominator:
Denominator for basic net income per share - weighted average common shares
32,138
31,831
32,086
31,775
Effect of dilutive securities:
Common stock options
774
1,159
838
1,241
Restricted stock awards
32
103
57
130
Denominator for dilutive net income per common share
 
32,944
33,093
32,81
33,146
Net income attributable to AXT, Inc. per common share:
Basic
$
0.04
$
0.22
$
0.09
$
0.35
Diluted
$
0.04
$
0.21
$
0.09
$
0.34
Options excluded from diluted net income per share as the impact is anti-dilutive
997
418
907
406
Restricted stock excluded from diluted net income per share as the impact is anti-dilutive
14
186
15
186