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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, 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    
Issuances of Common Stock in public offering 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 6,727     6,717     6,717 10  
Other comprehensive 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 (51)   (51)       (51)    
Stock-based compensation expense 1,640   1,640       1,640    
Components of comprehensive income, net of tax:                  
Net income 5,786     5,785     5,785 1  
Other comprehensive 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
Beginning Balance at Dec. 31, 2020 351,155 433 328,392 161,008 (204) (138,927) 350,820 335 118
Issuance of Common Stock under employee stock plans 8,621 4 8,617       8,621    
Stock-based compensation expense 5,005   5,005       5,005    
Components of comprehensive income, net of tax:                  
Net income 47,730     47,745     47,745 (15)  
Other comprehensive loss (857)       (836)   (836) (21)  
Total comprehensive income (loss) 46,873           46,909 (36)  
Ending Balance at Sep. 30, 2021 411,654 437 342,014 208,753 (1,040) (138,927) 411,355 299 118
Beginning Balance at Jun. 30, 2021 392,892 436 336,278 195,494 (813) (138,927) 392,586 306 118
Issuance of Common Stock under employee stock plans 3,870 1 3,869       3,870    
Stock-based compensation expense 1,867   1,867       1,867    
Components of comprehensive income, net of tax:                  
Net income 13,252     13,259     13,259 (7)  
Other comprehensive loss (227)       (227)   (227)    
Total comprehensive income (loss) 13,025           13,032 (7)  
Ending Balance at Sep. 30, 2021 $ 411,654 $ 437 $ 342,014 $ 208,753 $ (1,040) $ (138,927) $ 411,355 $ 299 $ 118