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Condensed 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, 2018 | $ 184,090 | $ 402 | $ 193,457 | $ 129,000 | $ (394) | $ (138,927) | $ 183,656 | $ 434 | $ 118
Issuance of Common Stock under employee stock plans | 1,707 | 1 | 1,706 |  |  |  | 1,707 |  |
Stock-based compensation expense | 1,539 |  | 1,539 |  |  |  | 1,539 |  |
Other | (4) |  | (4) |  |  |  | (4) |  |
Components of comprehensive income, net of tax: |  |  |  |  |  |  |  |  |
Net income | 6,862 |  |  | 6,849 |  |  | 6,849 | 13 |
Other comprehensive income | 122 |  |  |  | 116 |  | 116 | 6 |
Total comprehensive income | 6,984 |  |  |  |  |  | 6,965 | 19 |
Ending Balance at Jun. 30, 2019 | 194,316 | 403 | 196,698 | 135,849 | (278) | (138,927) | 193,863 | 453 | 118
Beginning Balance at Mar. 31, 2019 | 190,692 | 403 | 195,799 | 133,286 | (436) | (138,927) | 190,243 | 449 | 118
Issuance of Common Stock under employee stock plans | 137 |  | 137 |  |  |  | 137 |  |
Stock-based compensation expense | 766 |  | 766 |  |  |  | 766 |  |
Other | (4) |  | (4) |  |  |  | (4) |  |
Components of comprehensive income, net of tax: |  |  |  |  |  |  |  |  |
Net income | 2,556 |  |  | 2,563 |  |  | 2,563 | (7) |
Other comprehensive income | 169 |  |  |  | 158 |  | 158 | 11 |
Total comprehensive income | 2,725 |  |  |  |  |  | 2,721 | 4 |
Ending Balance at Jun. 30, 2019 | 194,316 | 403 | 196,698 | 135,849 | (278) | (138,927) | 193,863 | 453 | 118
Beginning Balance at Dec. 31, 2019 | 205,870 | 405 | 201,251 | 143,098 | (383) | (138,927) | 205,562 | 308 | 118
Issuance of Common Stock under employee stock plans | 7,385 | 8 | 7,377 |  |  |  | 7,385 |  |
Issuance of Common Stock in public offering (see Note 5) | 109,732 | 18 | 109,714 |  |  |  | 109,732 |  |
Stock-based compensation expense | 2,646 |  | 2,646 |  |  |  | 2,646 |  |
Components of comprehensive income, net of tax: |  |  |  |  |  |  |  |  |
Net income | 941 |  |  | 932 |  |  | 932 | 9 |
Other comprehensive income | 69 |  |  |  | 67 |  | 67 | 2 |
Total comprehensive income | 1,010 |  |  |  |  |  | 999 | 11 |
Ending Balance at Jun. 30, 2020 | 326,643 | 431 | 320,988 | 144,030 | (316) | (138,927) | 326,324 | 319 | 118
Beginning Balance at Mar. 31, 2020 | 206,997 | 407 | 204,020 | 141,363 | (300) | (138,927) | 206,681 | 316 | 118
Issuance of Common Stock under employee stock plans | 5,324 | 6 | 5,318 |  |  |  | 5,324 |  |
Issuance of Common Stock in public offering (see Note 5) | 109,732 | 18 | 109,714 |  |  |  | 109,732 |  |
Stock-based compensation expense | 1,936 |  | 1,936 |  |  |  | 1,936 |  |
Components of comprehensive income, net of tax: |  |  |  |  |  |  |  |  |
Net income | 2,672 |  |  | 2,667 |  |  | 2,667 | 5 |
Other comprehensive income | (18) |  |  |  | (16) |  | (16) | (2) |
Total comprehensive income | 2,654 |  |  |  |  |  | 2,651 | 3 |
Ending Balance at Jun. 30, 2020 | $ 326,643 | $ 431 | $ 320,988 | $ 144,030 | $ (316) | $ (138,927) | $ 326,324 | $ 319 | $ 118

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