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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, 2014 | Mar. 31, 2013 | Dec. 31, 2013
Numerator [Abstract] |  |  |
Net loss attributable to AXT, Inc. | $ (2,040) | $ (2,400) |
Less: Preferred stock dividends | (44) | (44) |
Net loss available to common stockholders | (2,084) | (2,444) |
Denominator [Abstract] |  |  |
Denominator for basic net loss per share - weighted average common shares (in shares) | 32,364 | 32,297 |
Effect Of Dilutive Securities On Earnings Per Share [Line Items] |  |  |
Denominator for dilutive net loss per common share (in shares) | 32,364 | 32,297 |
Net loss attributable to AXT, Inc. per common share [Abstract] |  |  |
Basic (in dollars per share) | $ (0.06) | $ (0.08) |
Diluted (in dollars per share) | $ (0.06) | $ (0.08) |
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
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 loss per share as the impact is anti-dilutive (in shares) | 2,607 | 2,656 |
Restricted stock awards [Member] |  |  |
Weighted-average shares [Abstract] |  |  |
Securities excluded from diluted net loss per share as the impact is anti-dilutive (in shares) | 241 | 239 |
Common stock options [Member] |  |  |
Effect Of Dilutive Securities On Earnings Per Share [Line Items] |  |  |
Effect of dilutive securities (in shares) | 0 | 0 |
Restricted stock awards [Member] |  |  |
Effect Of Dilutive Securities On Earnings Per Share [Line Items] |  |  |
Effect of dilutive securities (in shares) | 0 | 0 |

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