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Consolidated Statements of Equity - USD ($) $ in Thousands | Total | Common Stock [Member] | Additional Paid-In Capital [Member] | Retained Earnings [Member] | Accumulated Other Comprehensive Income (Loss) [Member] | Treasury Stock [Member] | Total Vicor Corporation Stockholders' Equity [Member] | Noncontrolling Interest [Member] | Class B Common Stock [Member]
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Beginning Balance at Dec. 31, 2015 | $ 136,085 | $ 395 | $ 174,337 | $ 99,685 | $ (577) | $ (138,927) | $ 135,031 | $ 1,054 | $ 118
Sales of Common Stock | 1,589 | 2 | 1,587 |  |  |  | 1,589 |  |
Acquisition of noncontrolling interest | (918) |  | (81) |  |  |  | (81) | (837) |
Stock-based compensation expense | 506 |  | 506 |  |  |  | 506 |  |
Net settlement stock option exercises | (5) |  | (5) |  |  |  | (5) |  |
Components of comprehensive income, net of tax |  |  |  |  |  |  |  |  |
Net (loss) | (6,261) |  |  | (6,247) |  |  | (6,247) | (14) |
Other comprehensive income | 21 |  |  |  | 16 |  | 16 | 5 |
Total comprehensive (loss) | (6,240) |  |  |  |  |  | (6,231) | (9) |
Ending Balance at Dec. 31, 2016 | 131,017 | 397 | 176,344 | 93,438 | (561) | (138,927) | 130,809 | 208 | 118
Sales of Common Stock | 3,300 | 4 | 3,296 |  |  |  | 3,300 |  |
Stock-based compensation expense | 1,735 |  | 1,735 |  |  |  | 1,735 |  |
Other | 20 |  | 20 |  |  |  | 20 |  |
Components of comprehensive income, net of tax |  |  |  |  |  |  |  |  |
Net (loss) | 258 |  |  | 167 |  |  | 167 | 91 |
Other comprehensive income | 89 |  |  |  | 83 |  | 83 | 6 |
Total comprehensive (loss) | 347 |  |  |  |  |  | 250 | 97 |
Ending Balance at Dec. 31, 2017 | 136,419 | 401 | 181,395 | 93,605 | (478) | (138,927) | 136,114 | 305 | 118
Sales of Common Stock | 6,782 | 6 | 6,776 |  |  |  | 6,782 |  |
Stock-based compensation expense | 3,396 |  | 3,396 |  |  |  | 3,396 |  |
Issuances of stock through employee stock purchase plan | 1,874 | 1 | 1,873 |  |  |  | 1,874 |  |
Cumulative effect of adoption of new accounting principle (Topic 606) | 3,670 |  |  | 3,670 |  |  | 3,670 |  |
Other | 11 | (6) | 17 |  |  |  | 11 |  |
Components of comprehensive income, net of tax |  |  |  |  |  |  |  |  |
Net (loss) | 31,846 |  |  | 31,725 |  |  | 31,725 | 121 |
Other comprehensive income | 92 |  |  |  | 84 |  | 84 | 8 |
Total comprehensive (loss) | 31,938 |  |  |  |  |  | 31,809 | 129 |
Ending Balance at Dec. 31, 2018 | $ 184,090 | $ 402 | $ 193,457 | $ 129,000 | $ (394) | $ (138,927) | $ 183,656 | $ 434 | $ 118

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