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Consolidated Statements of Operations - USD ($)
shares in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Income Statement [Abstract]      
Net revenues $ 227,830 $ 200,280 $ 220,194
Cost of revenues 126,174 109,071 120,676
Gross margin 101,656 91,209 99,518
Operating expenses:      
Selling, general and administrative 58,092 55,675 58,313
Research and development 44,924 41,848 41,472
Total operating expenses 103,016 97,523 99,785
Loss from operations (1,360) (6,314) (267)
Other income (expense), net:      
Total unrealized gains (losses) on available-for-sale securities, net 17 (18) (49)
Portion of (losses) gains recognized in other comprehensive income (loss) (6) 31 61
Net credit gains recognized in earnings 11 13 12
Other income (expense), net 1,251 271 13
Total other income (expense), net 1,262 284 25
Loss before income taxes (98) (6,030) (242)
Less: (Benefit) provision for income taxes (356) 231 (401)
Gain from sale of equity method investment, net of tax     5,000
Consolidated net income (loss) 258 (6,261) 5,159
Less: Net income (loss) attributable to noncontrolling interest 91 (14) 232
Net income (loss) attributable to Vicor Corporation $ 167 $ (6,247) $ 4,927
Net income (loss) per common share attributable to Vicor Corporation:      
Basic $ 0.00 $ (0.16) $ 0.13
Diluted $ 0.00 $ (0.16) $ 0.13
Shares used to compute net income (loss) per common share attributable to Vicor Corporation:      
Basic 39,228 38,842 38,754
Diluted 39,933 38,842 39,146