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Net Income Per Share (Details) - USD ($) | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2017
Numerator: |  |  |  |  |
Net income attributable to AXT, Inc. | $ 3,939,000 | $ 4,419,000 | $ 10,715,000 | $ 7,014,000 |
Less: Preferred stock dividends | (44,000) | (44,000) | (132,000) | (132,000) |
Net income available to common stockholders | $ 3,895,000 | $ 4,375,000 | $ 10,583,000 | $ 6,882,000 |
Weighted-average number of common shares outstanding: |  |  |  |  |
Denominator for basic net income per share - weighted-average common shares (in shares) | 39,008,000 | 38,499,000 | 39,000,000 | 36,999,000 |
Effect of dilutive securities: |  |  |  |  |
Denominator for dilutive net income per common share (in shares) | 40,331,000 | 40,095,000 | 40,320,000 | 38,469,000 |
Net income attributable to AXT, Inc. per common share: |  |  |  |  |
Basic (in dollars per share) | $ 0.10 | $ 0.11 | $ 0.27 | $ 0.19 |
Diluted (in dollars per share) | $ 0.10 | $ 0.11 | $ 0.26 | $ 0.18 |
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 |  |  |  |  |
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) | 186,000 | 68,000 | 186,000 | 573,000 |
Restricted Stock Awards |  |  |  |  |
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) | 34,000 | 34,000 | 239,000 | 11,000 |
Options |  |  |  |  |
Effect of dilutive securities: |  |  |  |  |
Effect of dilutive securities (in shares) | 1,207,000 | 1,416,000 | 1,196,000 | 1,283,000 |
Restricted Stock Awards |  |  |  |  |
Effect of dilutive securities: |  |  |  |  |
Effect of dilutive securities (in shares) | 116,000 | 180,000 | 124,000 | 187,000 |

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