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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 | Accumulated Other Comprehensive Income | AXT, Inc. Stockholders' Equity | Noncontrolling Interests | Total
--- | --- | --- | --- | --- | --- | --- | --- | ---
Balance, beginning of period at Dec. 31, 2014 | $ 3,532 | $ 32 | $ 192,665 | $ (68,393) | $ 7,673 | $ 135,509 | $ 6,425 | $ 141,934
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 |  |  |  |  |  |
Series A preferred stock dividend accrued as a result of common stock repurchase |  |  | (147) |  |  | (147) |  | (147)
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 |  |  |  | (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) |  |  |  |  |  |
Balance, end of period at Dec. 31, 2015 | $ 3,532 | $ 32 | 191,745 | (70,621) | 4,382 | 129,070 | 5,590 | 134,660
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 |  |  |  |  |  |
Restricted stock awards canceled |  | (207) |  |  |  |  |  |
Stock-based compensation |  |  | 1,096 |  |  | 1,096 |  | 1,096
Issuance of common stock in the form of restricted stock (in shares) |  | 136 |  |  |  |  |  |
Net income |  |  |  | 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)
Balance, end of period at Dec. 31, 2016 | $ 3,532 | $ 33 | 194,177 | (64,985) | 253 | 133,010 | 4,380 | 137,390
Balance (in shares) at Dec. 31, 2016 | 883 | 33,032 |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |
Common stock options exercised |  | $ 1 | 2,476 |  |  | 2,477 |  | 2,477
Common stock options exercised (in shares) |  | 762 |  |  |  |  |  |
Stock-based compensation |  |  | 1,405 |  |  | 1,405 |  | 1,405
Sale of subsidiary shares to noncontrolling interest |  |  | 1,765 |  |  | 1,765 | 235 | 2,000
Issuance of common stock in the form of restricted stock (in shares) |  | 312 |  |  |  |  |  |
Issuance of common stock, net of stock issuance cost |  | $ 5 | 31,856 |  |  | 31,861 |  | 31,861
Issuance of common stock, net of stock issuance cost (in shares) |  | 5,307 |  |  |  |  |  |
Net income |  |  |  | 10,148 |  | 10,148 | (87) | 10,061
Dividends declared by joint ventures |  |  |  |  |  |  | (465) | (465)
Other comprehensive income (loss) |  |  |  |  | 3,154 | 3,154 | 434 | 3,588
Balance, end of period at Dec. 31, 2017 | $ 3,532 | $ 39 | $ 231,679 | $ (54,837) | $ 3,407 | $ 183,820 | $ 4,497 | $ 188,317
Balance (in shares) at Dec. 31, 2017 | 883 | 39,413 |  |  |  |  |  |

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