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Net Income (loss) Per Share (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2013 | Mar. 31, 2012 | Dec. 31, 2012
Numerator: |  |  |  |
Net income attributable to AXT, Inc. | $ (2,400) | $ 1,635 |  |
Less: Preferred stock dividends | (44) | (44) |  |
Net income (loss) available to common stockholders | (2,444) | 1,591 |  |
Denominator: |  |  |  |
Denominator for basic net income per share-weighted average common shares (in shares) | 32,297 | 32,034 |  |
Effect of Dilutive Securities on Earnings Per Share [Line Items] |  |  |  |
Denominator for dilutive net income (loss) per share (in shares) | 32,297 | 33,018 |  |
Net income (loss) attributable to AXT, Inc. per common share: |  |  |  |
Net income (loss) attributable to AXT, Inc. (in dollars per share) | $ (0.08) | $ 0.05 |  |
Net income (loss) to common stockholders (in dollars per share) | $ (0.08) | $ 0.05 |  |
Weighted-average shares: [Abstract] |  |  |  |
Preferred stock, shares issued (in shares) | 883 |  | 883 |
Preferred stock, shares outstanding (in shares) | 883 |  | 883 |
Preferred stock, par value (in dollars per share) | $ 0.001 |  | $ 0.001 |
Preferred stock, value | $ 3,532 |  | $ 3,532 | [1]
Cumulative annual dividend rate (in hundredths) | 5.00% |  | 5.00% |
Liquidation preference over common stock (in dollars per share) | $ 4 |  | $ 4 |
Options [Member] |  |  |  |
Weighted-average shares: [Abstract] |  |  |  |
Securities excluded from diluted net income per share as the impact is anti-dilutive (in shares) | 2,656 | 878 |  |
Restricted stock awards [Member] |  |  |  |
Weighted-average shares: [Abstract] |  |  |  |
Securities excluded from diluted net income per share as the impact is anti-dilutive (in shares) | 239 | 74 |  |
Common stock options [Member] |  |  |  |
Effect of Dilutive Securities on Earnings Per Share [Line Items] |  |  |  |
Effect of dilutive securities (in shares) | 0 | 903 |  |
Restricted stock awards [Member] |  |  |  |
Effect of Dilutive Securities on Earnings Per Share [Line Items] |  |  |  |
Effect of dilutive securities (in shares) | 0 | 81 |  |
[1] | The condensed consolidated balance sheet at December 31, 2012 has been derived from the audited consolidated financial statements at that date.

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