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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, 2017 $ 136,419 $ 401 $ 181,395 $ 93,605 $ (478) $ (138,927) $ 136,114 $ 305 $ 118
Sales of Common Stock 4,039 3 4,036       4,039    
Stock-based compensation expense 1,916   1,916       1,916    
Issuances of stock through employee stock purchase plan 927 1 926       927    
Cumulative effect of adoption of new accounting principle (Topic 606) 3,670     3,670     3,670    
Other (3) (6) 3       (3)    
Components of comprehensive income, net of tax                  
Net income 11,891     11,803     11,803 88  
Other comprehensive income (loss) 79       77   77 2  
Total comprehensive income 11,970           11,880 90  
Ending Balance at Jun. 30, 2018 158,938 399 188,276 109,078 (401) (138,927) 158,543 395 118
Beginning Balance at Mar. 31, 2018 146,355 402 183,415 101,218 (234) (138,927) 145,992 363 118
Sales of Common Stock 3,681 3 3,678       3,681    
Stock-based compensation expense 1,180   1,180       1,180    
Other (3) (6) 3       (3)    
Components of comprehensive income, net of tax                  
Net income 7,909     7,860     7,860 49  
Other comprehensive income (loss) (184)       (167)   (167) (17)  
Total comprehensive income 7,725           7,693 32  
Ending Balance at Jun. 30, 2018 158,938 399 188,276 109,078 (401) (138,927) 158,543 395 118
Beginning Balance at Dec. 31, 2018 184,090 402 193,457 129,000 (394) (138,927) 183,656 434 118
Sales of Common Stock 428   428       428    
Stock-based compensation expense 1,539   1,539       1,539    
Issuances of stock through employee stock purchase plan 1,279 1 1,278       1,279    
Other (4)   (4)       (4)    
Components of comprehensive income, net of tax                  
Net income 6,862     6,849     6,849 13  
Other comprehensive income (loss) 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
Sales of Common Stock 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 (loss) 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