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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
Sales of Common Stock 358   358       358    
Stock-based compensation expense 736   736       736    
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    
Components of comprehensive income, net of tax                  
Net income 3,982     3,943     3,943 39  
Other comprehensive loss 263       244   244 19  
Total comprehensive income (loss) 4,245           4,187 58  
Ending Balance at Mar. 31, 2018 146,355 402 183,415 101,218 (234) (138,927) 145,992 363 118
Beginning Balance at Dec. 31, 2018 184,090 402 193,457 129,000 (394) (138,927) 183,656 434 118
Sales of Common Stock 291   291       291    
Stock-based compensation expense 773   773       773    
Issuances of stock through employee stock purchase plan 1,279 1 1,278       1,279    
Components of comprehensive income, net of tax                  
Net income 4,306     4,286     4,286 20  
Other comprehensive loss (47)       (42)   (42) (5)  
Total comprehensive income (loss) 4,259           4,244 15  
Ending Balance at Mar. 31, 2019 $ 190,692 $ 403 $ 195,799 $ 133,286 $ (436) $ (138,927) $ 190,243 $ 449 $ 118