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Net Income Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2019 | Mar. 31, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018 | Dec. 31, 2018
Numerator: |  |  |  |  |  |
Net income attributable to AXT, Inc. | $ 1,451 |  | $ 3,901 | $ 347 | $ 6,776 |
Less: Preferred stock dividends | (44) |  | (44) | (88) | (88) |
Net income available to common stockholders | $ 1,407 |  | $ 3,857 | $ 259 | $ 6,688 |
Weighted-average number of common shares outstanding: |  |  |  |  |  |
Denominator for basic net income per share - weighted-average common shares | 39,447,000 |  | 39,001,000 | 39,399,000 | 38,970,000 |
Effect of dilutive securities: |  |  |  |  |  |
Denominator for dilutive net income (loss) per common share (in shares) | 40,123,000 |  | 40,216,000 | 40,045,000 | 40,289,000 |
Net income attributable to AXT, Inc. per common share: |  |  |  |  |  |
Basic | $ 0.04 |  | $ 0.10 | $ 0.01 | $ 0.17 |
Diluted | $ 0.04 |  | $ 0.10 | $ 0.01 | $ 0.17 |
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% |  | 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) | 1,280,000 |  | 228,000 | 1,284,000 | 186,000 |
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) | 568,000 |  | 249,000 | 550,000 | 240,000 |
Options |  |  |  |  |  |
Effect of dilutive securities: |  |  |  |  |  |
Effect of dilutive securities (in shares) | 624,000 |  | 1,094,000 | 602,000 | 1,191,000 |
Restricted Stock Awards |  |  |  |  |  |
Effect of dilutive securities: |  |  |  |  |  |
Effect of dilutive securities (in shares) | 52,000 |  | 121,000 | 44,000 | 128,000 |

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