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Stockholders' Equity (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 6 Months Ended |  |  |  |  | 6 Months Ended
--- | --- | --- | --- | --- | --- | --- | ---
Jun. 30, 2012 | Jun. 30, 2011 | Jun. 30, 2012 | Jun. 30, 2011 | Jun. 30, 2012 Preferred Stock [Member] | Dec. 31, 2011 Preferred Stock [Member] | Jun. 30, 2012 Common Stock [Member] | Dec. 31, 2011 Common Stock [Member] | Jun. 30, 2012 Additional Paid In Capital [Member] | Jun. 30, 2012 Accumulated Deficit [Member] | Jun. 30, 2012 Other Comprehensive Income/(loss) [Member] | Jun. 30, 2012 AXT, Inc. stockholders equity [Member] | Jun. 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 |  |  | 219 |  |  |  |  |  |  | 219 |  |  | 219 |
Stock-based compensation |  |  | 573 |  |  |  |  |  |  | 573 |  |  | 573 |
Comprehensive income: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income | 2,427 | 9,068 | 5,379 |  | 14,355 |  |  |  |  |  | 2,934 |  | 2,934 | 2,445
Net dividends declared by joint ventures |  |  | (4,039) |  |  |  |  |  |  |  |  |  |  | (4,039)
Change in unrealized (loss) gain on marketable securities | 6 | 20 | 106 |  | (27) |  |  |  |  |  |  | 106 | 106 |
Currency translation adjustment |  |  | 311 |  |  |  |  |  |  |  |  | 239 | 239 | 72
Balance, end of period | $ 149,598 |  | $ 149,598 |  |  | $ 3,532 | $ 3,532 | $ 32 | $ 32 | $ 192,346 | $ (59,223) | $ 6,163 | $ 142,850 | $ 6,748
[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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