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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 3,423 2 3,421       3,423    
Stock-based compensation expense 2,292   2,292       2,292    
Other (4)   (4)       (4)    
Components of comprehensive income, net of tax:                  
Net income (loss) 12,794     12,786     12,786 8  
Other comprehensive income (loss) 121       116   116 5  
Total comprehensive income (loss) 12,915           12,902 13  
Ending Balance at Sep. 30, 2019 202,716 404 199,166 141,786 (278) (138,927) 202,269 447 118
Beginning Balance at Jun. 30, 2019 194,316 403 196,698 135,849 (278) (138,927) 193,863 453 118
Issuance of Common Stock under employee stock plans 1,716 1 1,715       1,716    
Stock-based compensation expense 753   753       753    
Components of comprehensive income, net of tax:                  
Net income (loss) 5,932     5,937     5,937 (5)  
Other comprehensive income (loss) (1)             (1)  
Total comprehensive income (loss) 5,931           5,937 (6)  
Ending Balance at Sep. 30, 2019 202,716 404 199,166 141,786 (278) (138,927) 202,269 447 118
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 10,836 10 10,826       10,836    
Issuance of Common Stock in public offering, net (see Note 5) 109,681 18 109,663       109,681    
Stock-based compensation expense 4,286   4,286       4,286    
Components of comprehensive income, net of tax:                  
Net income (loss) 6,727     6,717     6,717 10  
Other comprehensive income (loss) 188       180   180 8  
Total comprehensive income (loss) 6,915           6,897 18  
Ending Balance at Sep. 30, 2020 337,588 433 326,026 149,815 (203) (138,927) 337,262 326 118
Beginning Balance at Jun. 30, 2020 326,643 431 320,988 144,030 (316) (138,927) 326,324 319 118
Issuance of Common Stock under employee stock plans 3,451 2 3,449       3,451    
Additional expenses associated with issuance of Common Stock in public offering (see Note 5) (51)   (51)       (51)    
Stock-based compensation expense 1,640   1,640       1,640    
Components of comprehensive income, net of tax:                  
Net income (loss) 5,786     5,785     5,785 1  
Other comprehensive income (loss) 119       113   113 6  
Total comprehensive income (loss) 5,905           5,898 7  
Ending Balance at Sep. 30, 2020 $ 337,588 $ 433 $ 326,026 $ 149,815 $ (203) $ (138,927) $ 337,262 $ 326 $ 118