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Net income per Share (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2012 | Sep. 30, 2012 | Jun. 30, 2012 | Mar. 31, 2012 | Dec. 31, 2011 | Sep. 30, 2011 | Jun. 30, 2011 | Mar. 31, 2011 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Numerator: |  |  |  |  |  |  |  |  |  |  |
Net income attributable to AXT, Inc | $ (756) | $ 932 | $ 1,299 | $ 1,635 | $ 2,566 | $ 6,484 | $ 7,062 | $ 4,208 | $ 3,110 | $ 20,320 | $ 18,653
Less: Preferred stock dividends |  |  |  |  |  |  |  |  | (177) | (177) | (177)
Net income to common stockholders |  |  |  |  |  |  |  |  | $ 2,933 | $ 20,143 | $ 18,476
Denominator: |  |  |  |  |  |  |  |  |  |  |
Denominator for basic net income per share-weighted average common shares (in shares) |  |  |  |  |  |  |  |  | 32,144 | 31,872 | 31,008
Effect of Dilutive Securities on Earnings Per Share [Line Items] |  |  |  |  |  |  |  |  |  |  |
Denominator for dilutive net income (loss) per share (in shares) |  |  |  |  |  |  |  |  | 32,865 | 33,061 | 32,512
Basic net income (loss) per share [Abstract] |  |  |  |  |  |  |  |  |  |  |
Net income attributable to AXT, Inc (in dollars per share) |  |  |  |  |  |  |  |  | $ 0.1 | $ 0.64 | $ 0.6
Net income to common stockholders (in dollars per share) | $ (0.02) | $ 0.03 | $ 0.04 | $ 0.05 | $ 0.08 | $ 0.2 | $ 0.22 | $ 0.13 | $ 0.09 | $ 0.63 | $ 0.6
Diluted net income per share [Abstract] |  |  |  |  |  |  |  |  |  |  |
Net income attributable to AXT, Inc (in dollars per share) |  |  |  |  |  |  |  |  | $ 0.09 | $ 0.61 | $ 0.57
Net income to common stockholders (in dollars per share) | $ (0.02) | $ 0.03 | $ 0.04 | $ 0.05 | $ 0.08 | $ 0.19 | $ 0.21 | $ 0.13 | $ 0.09 | $ 0.61 | $ 0.57
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |  |  |  |  |  |  |  |
Securities excluded from diluted net income per share as the impact is anti-dilutive (in shares) |  |  |  |  |  |  |  |  | 13 | 116 | 127
Options [Member] |  |  |  |  |  |  |  |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |  |  |  |  |  |  |  |
Securities excluded from diluted net income per share as the impact is anti-dilutive (in shares) |  |  |  |  |  |  |  |  | 1,056 | 478 | 14
Common stock options [Member] |  |  |  |  |  |  |  |  |  |  |
Effect of Dilutive Securities on Earnings Per Share [Line Items] |  |  |  |  |  |  |  |  |  |  |
Effect of dilutive securities (in shares) |  |  |  |  |  |  |  |  | 689 | 1,093 | 1,380
Restricted stock [Member] |  |  |  |  |  |  |  |  |  |  |
Effect of Dilutive Securities on Earnings Per Share [Line Items] |  |  |  |  |  |  |  |  |  |  |
Effect of dilutive securities (in shares) |  |  |  |  |  |  |  |  | 32 | 96 | 124

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