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Significant Accounting Policies -Summary of Cumulative Effect of Adoption on Consolidated Statement of Operations (Detail) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Net revenues $ 73,720 $ 78,035 $ 74,196 $ 65,269 $ 58,771 $ 56,888 $ 57,709 $ 54,462 $ 291,220 $ 227,830 $ 200,280
Cost of revenues                 152,249 126,174 109,071
Gross margin 33,873 39,004 35,883 30,211 26,931 25,143 25,930 23,652 138,971 101,656 91,209
Income before income taxes                 32,933 (98) (6,030)
Provision for income taxes                 1,087 (356) 231
Consolidated net income 6,907 13,048 7,909 3,982 1,619 38 (445) (954) 31,846 258 (6,261)
Net income attributable to Vicor Corporation $ 6,910 $ 13,012 $ 7,860 $ 3,943 $ 1,611 $ (11) $ (459) $ (974) 31,725 $ 167 $ (6,247)
Accounting Standards Update 2014-09 [Member] | Adjustments [Member]                      
Net revenues                 (3,946)    
Cost of revenues                 (2,149)    
Gross margin                 (1,797)    
Income before income taxes                 (1,797)    
Provision for income taxes                 (59)    
Consolidated net income                 (1,738)    
Net income attributable to Vicor Corporation                 (1,738)    
Accounting Standards Update 2014-09 [Member] | Balances without adoption of Topic 606 [Member]                      
Net revenues                 287,274    
Cost of revenues                 150,100    
Gross margin                 137,174    
Income before income taxes                 31,136    
Provision for income taxes                 1,028    
Consolidated net income                 30,108    
Net income attributable to Vicor Corporation                 $ 29,987