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Consolidated Statements of Operations - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Income Statement [Abstract]    
Net revenues $ 65,725 $ 65,269
Cost of revenues 34,639 35,058
Gross margin 31,086 30,211
Operating expenses:    
Selling, general and administrative 15,373 15,399
Research and development 11,220 11,126
Total operating expenses 26,593 26,525
Income from operations 4,493 3,686
Other income (expense), net:    
Total unrealized gains on available-for-sale securities, net 20 23
Less: portion of gains recognized in other comprehensive income (19) (21)
Net credit gains recognized in earnings 1 2
Other income (expense), net 238 428
Total other income (expense), net 239 430
Income before income taxes 4,732 4,116
Less: Provision for income taxes 426 134
Consolidated net income 4,306 3,982
Less: Net income attributable to noncontrolling interest 20 39
Net income attributable to Vicor Corporation $ 4,286 $ 3,943
Net income per common share attributable to Vicor Corporation:    
Basic $ 0.11 $ 0.10
Diluted $ 0.10 $ 0.10
Shares used to compute net income per common share attributable to Vicor Corporation:    
Basic [1] 40,229 39,479
Diluted 41,029 40,167
[1] Denominator represents weighted average number of shares of Common Stock and Class B Common Stock outstanding.