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CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (USD $) In Thousands, unless otherwise specified | Preferred Stock [Member] | Common Stock [Member] | Additional Paid In Capital [Member] | Accumulated Deficit [Member] | Other Comprehensive Income/(Loss) [Member] | AXT, Inc. stockholders' equity [Member] | Noncontrolling interest [Member] | Total
--- | --- | --- | --- | --- | --- | --- | --- | ---
Balance at Dec. 31, 2009 | $ 3,532 | $ 30 | $ 187,871 | $ (101,130) | $ 4,300 | $ 94,603 | $ 2,648 | $ 97,251
Balance (in shares) at Dec. 31, 2009 | 883 | 30,880 |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |
Common stock options exercised |  | 2 | 1,495 |  |  | 1,497 |  | 1,497
Common stock options exercised (in shares) |  | 876 |  |  |  |  |  |
Stock-based compensation |  |  | 655 |  |  | 655 |  | 655
Issuance of common stock in the form of restricted stock (in shares) |  | 121 |  |  |  |  |  |
Comprehensive income (loss): |  |  |  |  |  |  |  |
Net income |  |  |  | 18,653 |  | 18,653 | 1,723 | 20,376
Dividend declared by joint ventures |  |  |  |  |  |  | (527) | (527)
Change in unrealized (loss) gain on marketable securities |  |  |  |  | (144) | (144) |  | (144)
Currency translation adjustment |  |  |  |  | 496 | 496 | 200 | 696
Balance at Dec. 31, 2010 | 3,532 | 32 | 190,021 | (82,477) | 4,652 | 115,760 | 4,044 | 119,804
Balance (in shares) at Dec. 31, 2010 | 883 | 31,877 |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |
Common stock options exercised |  |  | 637 |  |  | 637 |  | 637
Common stock options exercised (in shares) |  | 251 |  |  |  |  |  |
Stock-based compensation |  |  | 896 |  |  | 896 |  | 896
Issuance of common stock in the form of restricted stock (in shares) |  | 94 |  |  |  |  |  |
Comprehensive income (loss): |  |  |  |  |  |  |  |
Net income |  |  |  | 20,320 |  | 20,320 | 5,503 | 25,823
Dividend declared by joint ventures |  |  |  |  |  |  | (1,636) | (1,636)
Change in unrealized (loss) gain on marketable securities |  |  |  |  | (161) | (161) |  | (161)
Currency translation adjustment |  |  |  |  | 1,327 | 1,327 | 359 | 1,686
Balance at Dec. 31, 2011 | 3,532 | 32 | 191,554 | (62,157) | 5,818 | 138,779 | 8,270 | 147,049
Balance (in shares) at Dec. 31, 2011 | 883 | 32,222 |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |
Common stock options exercised |  |  | 294 |  |  | 294 |  | 294
Common stock options exercised (in shares) |  | 136 |  |  |  |  |  |
Stock-based compensation |  |  | 1,215 |  |  | 1,215 |  | 1,215
Issuance of common stock in the form of restricted stock (in shares) |  | 113 |  |  |  |  |  |
Comprehensive income (loss): |  |  |  |  |  |  |  |
Net income |  |  |  | 3,110 |  | 3,110 | 3,040 | 6,150
Dividend declared by joint ventures |  |  |  |  |  |  | (4,086) | (4,086)
Change in unrealized (loss) gain on marketable securities |  |  |  |  | 85 | 85 |  | 85
Currency translation adjustment |  |  |  |  | 130 | 130 | 77 | 207
Balance at Dec. 31, 2012 | $ 3,532 | $ 32 | $ 193,063 | $ (59,047) | $ 6,033 | $ 143,613 | $ 7,301 | $ 150,914
Balance (in shares) at Dec. 31, 2012 | 883 | 32,471 |  |  |  |  |  |

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