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Net Income Per Share (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2012 | Sep. 30, 2011 | Sep. 30, 2012 | Sep. 30, 2011 | Dec. 31, 2011
Numerator: |  |  |  |  |  |
Net income attributable to AXT, Inc. | $ 932 | $ 6,484 | $ 3,866 | $ 17,754 |  |
Less: Preferred stock dividends | (44) | (44) | (132) | (132) |  |
Net income available to common stockholders | 888 | 6,440 | 3,734 | 17,622 |  |
Denominator: |  |  |  |  |  |
Denominator for basic net income per share - weighted average common shares (in shares) | 32,183 | 31,944 | 32,118 | 31,832 |  |
Effect of Dilutive Securities on Earnings Per Share [Line Items] |  |  |  |  |  |
Denominator for dilutive net income per common share (in shares) | 32,769 | 33,126 | 32,911 | 33,140 |  |
Net income attributable to AXT, Inc. per common share: |  |  |  |  |  |
Basic (in dollars per share) | $ 0.03 | $ 0.20 | $ 0.12 | $ 0.55 |  |
Diluted (in dollars per share) | $ 0.03 | $ 0.19 | $ 0.11 | $ 0.53 |  |
Class of Stock [Line Items] |  |  |  |  |  |
Preferred stock, shares issued (in shares) | 883 |  | 883 |  | 883 |
Preferred stock, shares outstanding (in shares) | 883 |  | 883 |  | 883 |
Preferred stock, par value (in dollars per share) | $ 0.001 |  | $ 0.001 |  | $ 0.001 |
Preferred stock, value | $ 3,532 |  | $ 3,532 |  | $ 3,532 | [1]
Cumulative annual dividend rate (in hundredths) | 5.00% |  | 5.00% |  | 5.00% |
Liquidation preference over common stock (in dollars per share) | $ 4 |  | $ 4 |  | $ 4 |
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) | 992 | 407 | 977 | 403 |  |
Restricted stock [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) | 172 | 163 | 14 | 163 |  |
Restricted stock [Member] |  |  |  |  |  |
Effect of Dilutive Securities on Earnings Per Share [Line Items] |  |  |  |  |  |
Effect of dilutive securities (in shares) | 4 | 88 | 39 | 116 |  |
Common stock options [Member] |  |  |  |  |  |
Effect of Dilutive Securities on Earnings Per Share [Line Items] |  |  |  |  |  |
Effect of dilutive securities (in shares) | 582 | 1,094 | 754 | 1,192 |  |
[1] | The Condensed Consolidated Balance Sheet at December 31, 2011 has been derived from the audited consolidated financial statements at that date.

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