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Consolidated Statements of Operations - USD ($)
shares in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Income Statement [Abstract]      
Net revenues $ 296,576 $ 262,977 $ 291,220
Cost of revenues 165,129 140,011 152,249
Gross margin 131,447 122,966 138,971
Operating expenses:      
Selling, general and administrative 63,163 62,557 62,224
Research and development 50,916 46,588 44,286
Severance and other charges     402
Total operating expenses 114,079 109,145 106,912
Income from operations 17,368 13,821 32,059
Other income (expense), net:      
Total unrealized gains (losses) on available-for-sale securities, net 7 (16) 1
Portion of losses (gains) recognized in other comprehensive income (loss) (3) 20 6
Net credit gains recognized in earnings 4 4 7
Other income (expense), net 1,089 1,062 867
Total other income (expense), net 1,093 1,066 874
Income before income taxes 18,461 14,887 32,933
Less: Provision for income taxes 539 778 1,087
Consolidated net income 17,922 14,109 31,846
Less: Net income attributable to noncontrolling interest 12 11 121
Net income attributable to Vicor Corporation $ 17,910 $ 14,098 $ 31,725
Net income per common share attributable to Vicor Corporation:      
Basic $ 0.42 $ 0.35 $ 0.80
Diluted $ 0.41 $ 0.34 $ 0.78
Shares used to compute net income per common share attributable to Vicor Corporation:      
Basic 42,186 40,330 39,872
Diluted 43,869 41,677 40,729