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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, 2014 $ 130,552 $ 393 $ 171,901 $ 94,758 $ (471) $ (138,927) $ 127,772 $ 2,780 $ 118
Sales of Common Stock 820 2 818       820    
Acquisition of noncontrolling interest (360)   (144)       (144) (216)  
Disposition of consolidated subsidiary (1,742)   (5)       (5) (1,737)  
Stock-based compensation expense 1,782   1,782       1,782    
Net settlement stock option exercises (22)   (22)       (22)    
Other 7   7       7    
Components of comprehensive income, net of tax                  
Net income 5,159     4,927     4,927 232  
Other comprehensive income (loss) (111)       (106)   (106) (5)  
Total comprehensive income 5,048           4,821 227  
Ending Balance at Dec. 31, 2015 136,085 395 174,337 99,685 (577) (138,927) 135,031 1,054 118
Sales of Common Stock 1,589 2 1,587       1,589    
Acquisition of noncontrolling interest (918)   (81)       (81) (837)  
Stock-based compensation expense 506   506       506    
Net settlement stock option exercises (5)   (5)       (5)    
Components of comprehensive income, net of tax                  
Net income (6,261)     (6,247)     (6,247) (14)  
Other comprehensive income (loss) 21       16   16 5  
Total comprehensive income (6,240)           (6,231) (9)  
Ending Balance at Dec. 31, 2016 131,017 397 176,344 93,438 (561) (138,927) 130,809 208 118
Sales of Common Stock 3,300 4 3,296       3,300    
Stock-based compensation expense 1,735   1,735       1,735    
Other 20 0 20       20    
Components of comprehensive income, net of tax                  
Net income 258     167     167 91  
Other comprehensive income (loss) 89       83   83 6  
Total comprehensive income 347           250 97  
Ending Balance at Dec. 31, 2017 $ 136,419 $ 401 $ 181,395 $ 93,605 $ (478) $ (138,927) $ 136,114 $ 305 $ 118