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Recently Adopted Accounting Standard - Summary of Cumulative Effect of Adoption on Consolidated Statement of Operations (Detail) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Item Effected [Line Items]    
Net revenues $ 65,269 $ 54,462
Cost of revenues 35,058 30,810
Gross margin 30,211 23,652
Income (loss) before income taxes 4,116 (1,053)
Provision for income taxes 134 (99)
Consolidated net income (loss) 3,982 (954)
Net income (loss) attributable to Vicor Corporation 3,943 $ (974)
Accounting Standards Update 2014-09 [Member] | Adjustments [Member]    
Item Effected [Line Items]    
Net revenues (804)  
Cost of revenues (584)  
Gross margin (220)  
Income (loss) before income taxes (220)  
Provision for income taxes (7)  
Consolidated net income (loss) (213)  
Net income (loss) attributable to Vicor Corporation (213)  
Accounting Standards Update 2014-09 [Member] | Balances without adoption of Topic 606 [Member]    
Item Effected [Line Items]    
Net revenues 64,465  
Cost of revenues 34,474  
Gross margin 29,991  
Income (loss) before income taxes 3,896  
Provision for income taxes 127  
Consolidated net income (loss) 3,769  
Net income (loss) attributable to Vicor Corporation $ 3,730