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Stockholders' Equity (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 9 Months Ended |  |  |  |  | 9 Months Ended
--- | --- | --- | --- | --- | --- | --- | ---
Sep. 30, 2012 | Sep. 30, 2011 | Sep. 30, 2012 | Sep. 30, 2011 | Sep. 30, 2012 Preferred Stock [Member] | Dec. 31, 2011 Preferred Stock [Member] | Sep. 30, 2012 Common Stock [Member] | Dec. 31, 2011 Common Stock [Member] | Sep. 30, 2012 Additional Paid In Capital [Member] | Sep. 30, 2012 Accumulated Deficit [Member] | Sep. 30, 2012 Other Comprehensive Income/(loss) [Member] | Sep. 30, 2012 AXT, Inc. stockholders equity [Member] | Sep. 30, 2012 Noncontrolling interests [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance, beginning of period |  |  | $ 147,049 | [1] |  | $ 3,532 | $ 3,532 | $ 32 | $ 32 | $ 191,554 | $ (62,157) | $ 5,818 | $ 138,779 | $ 8,270
Common stock options exercised |  |  | 276 |  |  |  |  |  |  | 276 |  |  | 276 |
Stock-based compensation |  |  | 873 |  |  |  |  |  |  | 873 |  |  | 873 |
Comprehensive income: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income | 1,444 | 7,862 | 6,823 |  | 22,217 |  |  |  |  |  | 3,866 |  | 3,866 | 2,957
Net dividends declared by joint ventures |  |  | (4,086) |  |  |  |  |  |  |  |  |  |  | (4,086)
Change in unrealized (loss) gain on marketable securities | 9 | (191) | 115 |  | (218) |  |  |  |  |  |  | 115 | 115 |
Change in foreign currency translation adjustment, net of tax | (192) | 460 | 119 |  | 1,377 |  |  |  |  |  |  | 73 | 73 | 46
Balance, end of period | $ 151,169 |  | $ 151,169 |  |  | $ 3,532 | $ 3,532 | $ 32 | $ 32 | $ 192,703 | $ (58,291) | $ 6,006 | $ 143,982 | $ 7,187
[1] | The Condensed Consolidated Balance Sheet at December 31, 2011 has been derived from the audited consolidated financial statements at that date.

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