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Net Income (Loss) Per Share (Details) - USD ($) | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2016 | Jun. 30, 2015 | Jun. 30, 2016 | Jun. 30, 2015 | Dec. 31, 2015
Numerator: [Abstract] |  |  |  |  |
Net income (loss) attributable to AXT, Inc. | $ 1,151,000 | $ (3,000) | $ 1,193,000 | $ (1,027,000) |
Less: Preferred stock dividends | (44,000) | (44,000) | (88,000) | (88,000) |
Net loss available to common stockholders | $ 1,107,000 | $ (47,000) | $ 1,105,000 | $ (1,115,000) |
Basic net income (loss) per share [Abstract] |  |  |  |  |
Basic (in dollars per share) | $ 0.03 | $ 0.00 | $ 0.03 | $ (0.03) |
Diluted net income (loss) per share [Abstract] |  |  |  |  |
Diluted (in dollars per share) | $ 0.03 | $ 0.00 | $ 0.03 | $ (0.03) |
Denominator: [Abstract] |  |  |  |  |
Denominator for basic net loss per share - weighted average common shares (in shares) | 32,020,000 | 32,242,000 | 32,011,000 | 32,399,000 |
Denominator for dilutive net loss per common share (in shares) | 32,451,000 | 32,242,000 | 32,354,000 | 32,399,000 |
Preferred stock, shares issued (in shares) | 883,000 |  | 883,000 |  | 883,000
Preferred stock, shares outstanding (in shares) | 883,000 |  | 883,000 |  | 883,000
Preferred stock, par value (in dollars per share) | $ 0.001 |  | $ 0.001 |  | $ 0.001
Preferred stock, value | $ 3,532,000 |  | $ 3,532,000 |  | $ 3,532,000
Cumulative annual dividend rate (as a percent) |  |  | 5.00% |  | 5.00%
Liquidation preference over common stock (in dollars per share) | $ 4 |  | $ 4 |  | $ 4
Options [Member] |  |  |  |  |
Weighted-average shares: [Abstract] |  |  |  |  |
Securities excluded from diluted net income (loss) per share as the impact is anti-dilutive (in shares) | 1,343,000 | 3,102,000 | 2,551,000 | 3,102,000 |
Restricted Stock Awards [Member] |  |  |  |  |
Weighted-average shares: [Abstract] |  |  |  |  |
Securities excluded from diluted net income (loss) per share as the impact is anti-dilutive (in shares) | 19,000 | 466,000 | 10,000 | 466,000 |
Options [Member] |  |  |  |  |
Denominator: [Abstract] |  |  |  |  |
Effect of dilutive securities (in shares) | 284,000 |  | 223,000 |  |
Restricted Stock Awards [Member] |  |  |  |  |
Denominator: [Abstract] |  |  |  |  |
Effect of dilutive securities (in shares) | 147,000 |  | 120,000 |  |

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