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Stockholders' Equity (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 9 Months Ended |  |  |  |  | 9 Months Ended
--- | --- | --- | --- | --- | --- | --- | ---
Sep. 30, 2013 | Sep. 30, 2012 | Sep. 30, 2013 | Sep. 30, 2012 | Sep. 30, 2013 Preferred Stock [Member] | Dec. 31, 2012 Preferred Stock [Member] | Sep. 30, 2013 Common Stock [Member] | Dec. 31, 2012 Common Stock [Member] | Sep. 30, 2013 Additional Paid In Capital [Member] | Sep. 30, 2013 Accumulated Deficit [Member] | Sep. 30, 2013 Other Comprehensive Income/(loss) [Member] | Sep. 30, 2013 AXT, Inc. stockholders equity [Member] | Sep. 30, 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 |  |  | 278 |  |  |  |  |  |  | 278 |  |  | 272 |
Common stock repurchased |  |  | (287) |  |  |  |  |  |  | (287) |  |  | (287) |
Stock-based compensation |  |  | 1,004 |  |  |  |  |  |  | 1,004 |  |  | 1,004 |
Comprehensive income: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net loss | (2,065) | 1,444 | (5,625) |  | 6,823 |  |  |  |  |  | (6,730) |  | (6,730) | 1,105
Dividends declared by joint ventures |  |  | (2,898) |  |  |  |  |  |  |  |  |  |  | (2,898)
Change in unrealized (loss) gain on marketable securities | 73 | 9 | 26 |  | 115 |  |  |  |  |  |  | 26 | 26 |
Currency translation adjustment |  |  | 1,177 |  |  |  |  |  |  |  |  | 929 | 929 | 248
Balance, end of period | $ 144,589 |  | $ 144,589 |  |  | $ 3,532 | $ 3,532 | $ 32 | $ 32 | $ 194,058 | $ (65,777) | $ 6,988 | $ 138,833 | $ 5,756
[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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