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CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) shares in Thousands, $ in Thousands | Preferred Stock | Common Stock | Additional Paid-In Capital | Accumulated Deficit | Other Comprehensive Income | AXT, Inc. Stockholders' Equity | Noncontrolling Interests | Total
--- | --- | --- | --- | --- | --- | --- | --- | ---
Balance, beginning of period 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
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 |  |  |  |  |  |
Net income (loss) |  |  |  | (7,958) |  | (7,958) | 1,145 | (6,813)
Dividends declared by joint ventures |  |  |  |  |  |  | (2,898) | (2,898)
Other comprehensive income (loss) |  |  |  |  | 2,920 | 2,920 | 330 | 3,250
Balance, end of period 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 |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |
Common stock options exercised |  |  | 134 |  |  | 134 |  | 134
Options exercised (in shares) |  | 111 |  |  |  |  |  |
Stock-based compensation |  |  | 1,129 |  |  | 1,129 |  | 1,129
Issuance of common stock in the form of restricted stock (in shares) |  | 121 |  |  |  |  |  |
Net income (loss) |  |  |  | (1,388) |  | (1,388) | 691 | (697)
Dividends declared by joint ventures |  |  |  |  |  |  | (83) | (83)
Other comprehensive income (loss) |  |  |  |  | (1,280) | (1,280) | (61) | (1,341)
Balance, end of period at Dec. 31, 2014 | $ 3,532 | $ 32 | 195,419 | (68,393) | 7,673 | 138,263 | 6,425 | 144,688
Balance (in shares) at Dec. 31, 2014 | 883 | 32,837 |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |
Common stock options exercised |  |  | 165 |  |  | 165 |  | 165
Options exercised (in shares) |  | 119 |  |  |  |  |  |
Common stock repurchased |  |  | (2,287) |  |  | (2,287) |  | (2,287)
Common stock repurchased (in shares) |  | (908) |  |  |  |  |  |
Restricted stock awards canceled |  | (47) |  |  |  |  |  |
Stock-based compensation |  |  | 1,349 |  |  | 1,349 |  | 1,349
Issuance of common stock in the form of restricted stock (in shares) |  | 547 |  |  |  |  |  |
Net income (loss) |  |  |  | (2,228) |  | (2,228) | (305) | (2,533)
Dividends declared by joint ventures |  |  |  |  |  |  | (83) | (83)
Other comprehensive income (loss) |  |  |  |  | (3,291) | (3,291) | (447) | (3,738)
Balance, end of period at Dec. 31, 2015 | $ 3,532 | $ 32 | $ 194,646 | $ (70,621) | $ 4,382 | $ 131,971 | $ 5,590 | $ 137,561
Balance (in shares) at Dec. 31, 2015 | 883 | 32,548 |  |  |  |  |  |

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