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Stockholders' Equity (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended |  |  |  |  | 3 Months Ended
--- | --- | --- | --- | --- | --- | ---
Mar. 31, 2013 | Mar. 31, 2012 | Mar. 31, 2013 Preferred Stock [Member] | Dec. 31, 2012 Preferred Stock [Member] | Mar. 31, 2013 Common Stock [Member] | Dec. 31, 2012 Common Stock [Member] | Mar. 31, 2013 Additional Paid In Capital [Member] | Mar. 31, 2013 Accumulated Deficit [Member] | Mar. 31, 2013 Other Comprehensive Income/(loss) [Member] | Mar. 31, 2013 AXT, Inc. stockholders equity [Member] | Mar. 31, 2013 Noncontrolling interests [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |
Balance, beginning of period | $ 150,914 | [1] |  | $ 3,532 | $ 3,532 | $ 32 | $ 32 | $ 193,063 | $ (59,047) | $ 6,033 | $ 143,613 | $ 7,301
Common stock options exercised | 256 |  |  |  |  |  |  | 256 |  |  | 256 |
Stock-based compensation | 332 |  |  |  |  |  |  | 332 |  |  | 332 |
Comprehensive income: |  |  |  |  |  |  |  |  |  |  |  |
Net loss | (1,959) |  | 2,952 |  |  |  |  |  | (2,400) |  | (2,400) | 441
Dividends declared by joint ventures | (2,897) |  |  |  |  |  |  |  |  |  |  | (2,897)
Change in unrealized (loss) gain on marketable securities | (17) |  | 100 |  |  |  |  |  |  | (17) | (17) |
Currency translation adjustment | 407 |  |  |  |  |  |  |  |  | 350 | 350 | 57
Balance, end of period | $ 147,036 |  |  | $ 3,532 | $ 3,532 | $ 32 | $ 32 | $ 193,651 | $ (61,447) | $ 6,366 | $ 142,134 | $ 4,902
[1] | The condensed consolidated balance sheet at December 31, 2012 has been derived from the audited consolidated financial statements at that date.

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