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Net Income Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016 | Dec. 31, 2016
Numerator: |  |  |  |  |
Net income attributable to AXT, Inc | $ 4,419 | $ 2,229 | $ 7,014 | $ 3,422 |
Less: Preferred stock dividends | (44) | (44) | (132) | (132) |
Net income available to common stockholders | $ 4,375 | $ 2,185 | $ 6,882 | $ 3,290 |
Denominator: |  |  |  |  |
Denominator for basic net income per share - weighted average common shares (in shares) | 38,499,000 | 32,110,000 | 36,999,000 | 32,043,000 |
Effect of dilutive securities: |  |  |  |  |
Denominator for dilutive net income per common share (in shares) | 40,095,000 | 33,138,000 | 38,469,000 | 32,615,000 |
Net income attributable to AXT, Inc. per common share: |  |  |  |  |
Basic (in dollars per share) | $ 0.11 | $ 0.07 | $ 0.19 | $ 0.10 |
Diluted (in dollars per share) | $ 0.11 | $ 0.07 | $ 0.18 | $ 0.10 |
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 |  | $ 3,532 |  | $ 3,532
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] |  |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |  |
Securities excluded from diluted net income (loss) per share as the impact is anti-dilutive (in shares) | 68,000 | 652,000 | 573,000 | 910,000 |
Restricted Stock Awards [Member] |  |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |  |
Securities excluded from diluted net income (loss) per share as the impact is anti-dilutive (in shares) | 34,000 |  | 11,000 |  |
Options [Member] |  |  |  |  |
Effect of dilutive securities: |  |  |  |  |
Effect of dilutive securities (in shares) | 1,416,000 | 827,000 | 1,283,000 | 425,000 |
Restricted Stock Awards [Member] |  |  |  |  |
Effect of dilutive securities: |  |  |  |  |
Effect of dilutive securities (in shares) | 180,000 | 201,000 | 187,000 | 147,000 |

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