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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, 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
Common stock options exercised (in shares) |  | 111 |  |  |  |  |  |
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)
Stock-based compensation |  |  | 1,129 |  |  | 1,129 |  | 1,129
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
Common stock options exercised (in shares) |  | 119 |  |  |  |  |  |
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)
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
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 |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |
Common stock options exercised |  | $ 1 | 1,336 |  |  | 1,337 |  | 1,337
Common stock options exercised (in shares) |  | 555 |  |  |  |  |  |
Issuance of common stock in the form of restricted stock (in shares) |  | 136 |  |  |  |  |  |
Net income (loss) |  |  |  | 5,636 |  | 5,636 | (670) | 4,966
Dividends declared by joint ventures |  |  |  |  |  |  | (52) | (52)
Other comprehensive income (loss) |  |  |  |  | (4,129) | (4,129) | (488) | (4,617)
Restricted stock awards canceled |  | (207) |  |  |  |  |  |
Stock-based compensation |  |  | 1,096 |  |  | 1,096 |  | 1,096
Balance, end of period at Dec. 31, 2016 | $ 3,532 | $ 33 | $ 197,078 | $ (64,985) | $ 253 | $ 135,911 | $ 4,380 | $ 140,291
Balance (in shares) at Dec. 31, 2016 | 883 | 33,032 |  |  |  |  |  |

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