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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 interests [Member] | Total
--- | --- | --- | --- | --- | --- | --- | --- | ---
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 (loss) |  |  |  | 20,320 |  | 20,320 | 5,503 | 25,823
Net 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 (loss) |  |  |  | 3,110 |  | 3,110 | 3,040 | 6,150
Net 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 |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |
Common stock options exercised |  |  | 532 |  |  | 532 |  | 532
Common stock options exercised (in shares) |  | 331 |  |  |  |  |  |
Common stock repurchased |  |  | (716) |  |  | (716) |  | (716)
Common stock repurchased (in shares) |  | (285) |  |  |  |  |  |
Stock-based compensation |  |  | 1,277 |  |  | 1,277 |  | 1,277
Issuance of common stock in the form of restricted stock (in shares) |  | 88 |  |  |  |  |  |
Comprehensive income (loss): |  |  |  |  |  |  |  |
Net income (loss) |  |  |  | (7,958) |  | (7,958) | 1,145 | (6,813)
Net dividend declared by joint ventures |  |  |  |  |  |  | (2,898) | (2,898)
Change in unrealized (loss) gain on marketable securities |  |  |  |  | 1,682 | 1,682 |  | 1,682
Currency translation adjustment |  |  |  |  | 1,238 | 1,238 | 330 | 1,568
Balance at Dec. 31, 2013 | $ 3,532 | $ 32 | $ 194,156 | $ (67,005) | $ 8,953 | $ 139,668 | $ 5,878 | $ 145,546
Balance (in shares) at Dec. 31, 2013 | 883 | 32,605 |  |  |  |  |  |

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