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Condensed Consolidated Statements of Operations (Unaudited) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Condensed Consolidated Statements of Operations [Abstract]    
Net revenues $ 41,946 $ 59,668
Cost of revenues 25,339 35,201
Gross margin 16,607 24,467
Operating expenses:    
Selling, general and administrative 13,887 14,160
Research and development 9,855 9,843
Severance charges 1,361  
Total operating expenses 25,103 24,003
Income (loss) from operations (8,496) 464
Other income (expense), net:    
Total unrealized gains on available-for-sale securities, net of unrealized losses 52 224
Portion of losses recognized in other comprehensive income (loss) (51) (221)
Net credit gains recognized in earnings 1 3
Other income, net: 14 50
Total other income, net 15 53
Income (loss) before income taxes (8,481) 517
(Benefit) Provision for income taxes (3,495) 176
Consolidated net income (loss) (4,986) 341
Less: Net income attributable to noncontrolling interest 4 15
Net income (loss) attributable to Vicor Corporation $ (4,990) $ 326
Net income (loss) per common share attributable to Vicor Corporation:    
Basic $ (0.12) $ 0.01
Diluted $ (0.12) $ 0.01
Shares used to compute net income (loss) per share attributable to Vicor Corporation:    
Basic 41,167 41,811
Diluted 41,167 41,826
Cash dividends per share