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Stockholders' Equity (Tables) | 9 Months Ended
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Sep. 30, 2012
Stockholders' Equity [Abstract] |
Consolidated Statements of Changes in Equity | Consolidated Statement of Changes in Equity (in thousands)
|  | Preferred Stock |  |  | Common Stock |  |  | Additional Paid In Capital |  |  | Accumulated Deficit |  |  | Accumulated Other Comprehensive Income/(loss) |  |  | AXT, Inc. Stockholders' Equity |  |  | Noncontrolling Interests |  |  | Total Stockholders' Equity |
Balance as of December 31, 2011 |  | $ | 3,532 |  |  | $ | 32 |  |  | $ | 191,554 |  |  | $ | (62,157 | ) |  | $ | 5,818 |  |  | $ | 138,779 |  |  | $ | 8,270 |  |  | $ | 147,049 |
Common stock options exercised |  |  |  |  |  |  |  |  |  |  | 276 |  |  |  |  |  |  |  |  |  |  |  | 276 |  |  |  |  |  |  |  | 276 |
Stock-based compensation |  |  |  |  |  |  |  |  |  |  | 873 |  |  |  |  |  |  |  |  |  |  |  | 873 |  |  |  |  |  |  |  | 873 |
Comprehensive income: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3,866 |  |  |  |  |  |  |  | 3,866 |  |  |  | 2,957 |  |  |  | 6,823 |
Net dividends declared by joint ventures |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (4,086 | ) |  |  | (4,086 | )
Change in unrealized (loss) gain on marketable securities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 115 |  |  |  | 115 |  |  |  |  |  |  |  | 115 |
Currency translation adjustment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 73 |  |  |  | 73 |  |  |  | 46 |  |  |  | 119 |
Balance as of September 30, 2012 |  | $ | 3,532 |  |  | $ | 32 |  |  | $ | 192,703 |  |  | $ | (58,291 | ) |  | $ | 6,006 |  |  | $ | 143,982 |  |  | $ | 7,187 |  |  | $ | 151,169 |

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- Definition Tabular disclosure of changes in the separate accounts comprising stockholders' equity (in addition to retained earnings) and of the changes in the number of shares of equity securities during at least the most recent annual fiscal period and any subsequent interim period presented is required to make the financial statements sufficiently informative if both financial position and results of operations are presented. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 + Details
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