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Consolidated Statements of Operations - USD ($)
shares in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Income Statement [Abstract]      
Net revenues $ 291,220 $ 227,830 $ 200,280
Cost of revenues 152,249 126,174 109,071
Gross margin 138,971 101,656 91,209
Operating expenses:      
Selling, general and administrative 62,224 58,092 55,675
Research and development 44,286 44,924 41,848
Severance and other charges 402    
Total operating expenses 106,912 103,016 97,523
Income (loss) from operations 32,059 (1,360) (6,314)
Other income (expense), net:      
Total unrealized gains (losses) on available-for-sale securities, net 1 17 (18)
Portion of losses (gains) recognized in other comprehensive income (loss) 6 (6) 31
Net credit gains recognized in earnings 7 11 13
Other income (expense), net 867 1,251 271
Total other income (expense), net 874 1,262 284
Income (loss) before income taxes 32,933 (98) (6,030)
Less: Provision (benefit) for income taxes 1,087 (356) 231
Consolidated net income (loss) 31,846 258 (6,261)
Less: Net income (loss) attributable to noncontrolling interest 121 91 (14)
Net income (loss) attributable to Vicor Corporation $ 31,725 $ 167 $ (6,247)
Net income (loss) per common share attributable to Vicor Corporation:      
Basic $ 0.80 $ 0.00 $ (0.16)
Diluted $ 0.78 $ 0.00 $ (0.16)
Shares used to compute net income (loss) per common share attributable to Vicor Corporation:      
Basic 39,872 39,228 38,842
Diluted 40,729 39,933 38,842