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Net Income (Loss) Per Share (Tables) | 12 Months Ended
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Dec. 31, 2017
Net Income (Loss) Per Share |
Reconciliation of numerators and denominators of basic and diluted net income (loss) per share |
|  | Year ended |
|  | December 31, |
|  | 2017 |  | 2016 |  | 2015 |
Numerator: |  |  |  |  |  |  |  |  |  |
Net income (loss) attributable to AXT, Inc. |  | $ | 10,148 |  | $ | 5,636 |  | $ | (2,228) |
Less: Preferred stock dividends |  |  | (177) |  |  | (177) |  |  | (177) |
Net income (loss) available to common stockholders |  | $ | 9,971 |  | $ | 5,459 |  | $ | (2,405) |
Denominator: |  |  |  |  |  |  |  |  |  |
Denominator for basic net income per share - weighted average common shares |  |  | 37,444 |  |  | 32,139 |  |  | 32,183 |
Effect of dilutive securities: |  |  |  |  |  |  |  |  |  |
Common stock options |  |  | 1,339 |  |  | 596 |  |  | — |
Restricted stock awards |  |  | 183 |  |  | 159 |  |  | — |
Denominator for dilutive net income per common shares |  |  | 38,966 |  |  | 32,894 |  |  | 32,183 |
Basic net income (loss) per share: |  |  |  |  |  |  |  |  |  |
Net income (loss) attributable to AXT, Inc. |  | $ | 0.27 |  | $ | 0.17 |  | $ | (0.07) |
Net income (loss) to common stockholders |  | $ | 0.27 |  | $ | 0.17 |  | $ | (0.07) |
Diluted net income (loss) per share: |  |  |  |  |  |  |  |  |  |
Net income (loss) attributable to AXT, Inc. |  | $ | 0.26 |  | $ | 0.17 |  | $ | (0.07) |
Net income (loss) to common stockholders |  | $ | 0.26 |  | $ | 0.17 |  | $ | (0.07) |
Options excluded from diluted net income (loss) per share as the impact is anti-dilutive |  |  | 86 |  |  | 779 |  |  | 3,779 |
Restricted stock excluded from diluted net income (loss) per share as the impact is anti-dilutive |  |  | 63 |  |  | 15 |  |  | 546 |

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- Definition Tabular disclosure of an entity's basic and diluted earnings per share calculations, including a reconciliation of numerators and denominators of the basic and diluted per-share computations for income from continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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