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Stockholders' Equity (Tables) | 6 Months Ended
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Jun. 30, 2020
Stockholders' Equity |
Consolidated statements of changes in stockholders' equity | Condensed Consolidated Statements of Changes in Stockholders’ Equity (in thousands) ​ The changes in stockholders’ equity by component for the three and six months ended June 30, 2020 are as follows: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  |  |  |  |  |  |  |  |  | Accumulated | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | Other | ​ | AXT, Inc. |  |  |  | Total | ​
​ |  | Preferred |  | Common |  | Additional |  | Accumulated |  | Comprehensive | ​ | Stockholders’ |  | Noncontrolling |  | Stockholders’ | ​
​ |  | Stock |  | Stock |  | Paid-In Capital |  | Deficit |  | Income (Loss) |  | Equity |  | Interests |  | Equity |
Balance as of December 31, 2019 |  | $ | 3,532 |  | $ | 41 |  | $ | 236,957 |  | $ | (47,783) |  | $ | (4,862) | ​ | $ | 187,885 |  | $ | 4,877 |  | $ | 192,762 | ​
Common stock options exercised | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 441 | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 441 | ​ | ​ | — | ​ | ​ | 441 | ​
Stock-based compensation | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 643 | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 643 | ​ | ​ | — | ​ | ​ | 643 | ​
Net income (loss) | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | (178) | ​ | ​ | — | ​ | ​ | (178) | ​ | ​ | 395 | ​ | ​ | 217 | ​
Other comprehensive loss | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | (1,775) | ​ | ​ | (1,775) | ​ | ​ | (98) | ​ | ​ | (1,873) | ​
Balance as of March 31, 2020 | ​ | $ | 3,532 | ​ | $ | 41 | ​ | $ | 238,041 | ​ | $ | (47,961) | ​ | $ | (6,637) | ​ | $ | 187,016 | ​ | $ | 5,174 | ​ | $ | 192,190 | ​
Common stock options exercised | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 72 | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 72 | ​ | ​ | — | ​ | ​ | 72 | ​
Stock-based compensation | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 641 | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 641 | ​ | ​ | — | ​ | ​ | 641 | ​
Net income | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 361 | ​ | ​ | — | ​ | ​ | 361 | ​ | ​ | 598 | ​ | ​ | 959 | ​
Net dividend declared by joint ventures | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | (89) | ​ | ​ | (89) | ​
Other comprehensive income | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 272 | ​ | ​ | 272 | ​ | ​ | 9 | ​ | ​ | 281 | ​
Balance as of June 30, 2020 |  | $ | 3,532 | ​ | $ | 41 | ​ | $ | 238,754 | ​ | $ | (47,600) | ​ | $ | (6,365) | ​ | $ | 188,362 | ​ | $ | 5,692 | ​ | $ | 194,054 | ​
​ The changes in stockholders’ equity by component for the three and six months ended June 30, 2019 are as follows: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  |  |  |  |  |  |  |  |  | Accumulated | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | Other | ​ | AXT, Inc. |  |  |  | Total
​ |  | Preferred |  | Common |  | Additional |  | Accumulated |  | Comprehensive | ​ | Stockholders’ |  | Noncontrolling |  | Stockholders’
​ |  | Stock |  | Stock |  | Paid-In Capital |  | Deficit |  | Income (Loss) |  | Equity |  | Interests |  | Equity
Balance as of December 31, 2018 |  | $ | 3,532 |  | $ | 40 |  | $ | 234,418 |  | $ | (45,183) |  | $ | (1,972) | ​ | $ | 190,835 |  | $ | 3,697 |  | $ | 194,532
Reclassification out of accumulated other comprehensive income and noncontrolling interests upon the deconsolidation of a subsidiary | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | (1,150) | ​ | ​ | (1,150) | ​ | ​ | 533 | ​ | ​ | (617)
Stock-based compensation | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 558 | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 558 | ​ | ​ | — | ​ | ​ | 558
Net income (loss) | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | (1,104) | ​ | ​ | — | ​ | ​ | (1,104) | ​ | ​ | 81 | ​ | ​ | (1,023)
Other comprehensive income | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 2,389 | ​ | ​ | 2,389 | ​ | ​ | 142 | ​ | ​ | 2,531
Balance as of March 31, 2019 | ​ | $ | 3,532 | ​ | $ | 40 | ​ | $ | 234,976 | ​ | $ | (46,287) | ​ | $ | (733) | ​ | $ | 191,528 | ​ | $ | 4,453 | ​ | $ | 195,981
Common stock options exercised | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 232 | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 232 | ​ | ​ | — | ​ | ​ | 232
Purchase of subsidiary shares from noncontrolling interests | ​ | ​ | — | ​ | ​ | — | ​ | ​ | (74) | ​ | ​ | — | ​ | ​ | — | ​ | ​ | (74) | ​ | ​ | (339) | ​ | ​ | (413)
Stock-based compensation | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 568 | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 568 | ​ | ​ | — | ​ | ​ | 568
Net income | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 1,451 | ​ | ​ | — | ​ | ​ | 1,451 | ​ | ​ | 287 | ​ | ​ | 1,738
Other comprehensive loss | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | (2,397) | ​ | ​ | (2,397) | ​ | ​ | (54) | ​ | ​ | (2,451)
Balance as of June 30, 2019 |  | $ | 3,532 | ​ | $ | 40 | ​ | $ | 235,702 | ​ | $ | (44,836) | ​ | $ | (3,130) | ​ | $ | 191,308 | ​ | $ | 4,347 | ​ | $ | 195,655

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- Definition Tabular disclosure of changes in the separate accounts comprising stockholders' equity (in addition to retained earnings) and of the changes in the number of shares of equity securities during at least the most recent annual fiscal period and any subsequent interim period presented is required to make the financial statements sufficiently informative if both financial position and results of operations are presented. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21463-112644 + Details
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