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Consolidated Statements of Operations - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Income Statement [Abstract]    
Net revenues $ 88,796 $ 63,401
Cost of revenues 44,096 36,070
Gross margin 44,700 27,331
Operating expenses:    
Selling, general and administrative 16,954 16,369
Research and development 13,026 13,335
Total operating expenses 29,980 29,704
Income (loss) from operations 14,720 (2,373)
Other income (expense), net:    
Total unrealized gains on available-for-sale securities, net 24 47
Less: portion of gains recognized in other comprehensive income (23) (46)
Net credit gains recognized in earnings 1 1
Other income (expense), net 231 147
Total other income (expense), net 232 148
Income (loss) before income taxes 14,952 (2,225)
Benefit for income taxes (143) (494)
Consolidated net income (loss) 15,095 (1,731)
Less: Net income attributable to noncontrolling interest 3 4
Net income (loss) attributable to Vicor Corporation $ 15,092 $ (1,735)
Net income (loss) per common share attributable to Vicor Corporation:    
Basic $ 0.35 $ (0.04)
Diluted $ 0.34 $ (0.04)
Shares used to compute net income (loss) per common share attributable to Vicor Corporation:    
Basic [1] 43,455 40,635
Diluted 44,841 40,635
[1] Denominator represents weighted average number of shares of Common Stock and Class B Common Stock outstanding.