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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, 2017 $ 136,419 $ 401 $ 181,395 $ 93,605 $ (478) $ (138,927) $ 136,114 $ 305 $ 118
Issuance of Common Stock under employee stock plans 8,656 7 8,649       8,656    
Stock-based compensation expense 3,396   3,396       3,396    
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 income 31,846     31,725     31,725 121  
Other comprehensive income 92       84   84 8  
Total comprehensive income 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
Issuance of Common Stock under employee stock plans 4,742 3 4,739       4,742    
Stock-based compensation expense 3,036   3,036       3,036    
Noncontrolling interest dividend paid (139)             (139)  
Other 19   19       19    
Components of comprehensive income, net of tax                  
Net income 14,109     14,098     14,098 11  
Other comprehensive income 13       11   11 2  
Total comprehensive income 14,122           14,109 13  
Ending 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 11,585 10 11,575       11,585    
Issuance of Common Stock in public offering, net (See Note 12) 109,681 18 109,663       109,681    
Stock-based compensation expense 5,883   5,883       5,883    
Other 20   20       20    
Components of comprehensive income, net of tax                  
Net income 17,922     17,910     17,910 12  
Other comprehensive income 194       179   179 15  
Total comprehensive income 18,116           18,089 27  
Ending Balance at Dec. 31, 2020 $ 351,155 $ 433 $ 328,392 $ 161,008 $ (204) $ (138,927) $ 350,820 $ 335 $ 118