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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, 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 (loss) (6,261)     (6,247)     (6,247) (14)  
Other comprehensive income 21       16   16 5  
Total comprehensive (loss) (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   20       20    
Components of comprehensive income, net of tax                  
Net (loss) 258     167     167 91  
Other comprehensive income 89       83   83 6  
Total comprehensive (loss) 347           250 97  
Ending Balance at Dec. 31, 2017 136,419 401 181,395 93,605 (478) (138,927) 136,114 305 118
Sales of Common Stock 6,782 6 6,776       6,782    
Stock-based compensation expense 3,396   3,396       3,396    
Issuances of stock through employee stock purchase plan 1,874 1 1,873       1,874    
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 (loss) 31,846     31,725     31,725 121  
Other comprehensive income 92       84   84 8  
Total comprehensive (loss) 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