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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 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Item Effected [Line Items]        
Net revenues $ 78,035 $ 56,888 $ 217,500 $ 169,059
Cost of revenues 39,031 31,745 112,402 94,334
Gross margin 39,004 25,143 105,098 74,725
Income before income taxes 13,275 409 25,663 (822)
Provision for income taxes 227 371 724 539
Consolidated net income 13,048 38 24,939 (1,361)
Net income attributable to Vicor Corporation 13,012 $ (11) 24,815 $ (1,444)
Accounting Standards Update 2014-09 [Member] | Adjustments [Member]        
Item Effected [Line Items]        
Net revenues (1,026)   (2,427)  
Cost of revenues (575)   (1,531)  
Gross margin (451)   (896)  
Income before income taxes (451)   (896)  
Provision for income taxes (7)   (25)  
Consolidated net income (444)   (871)  
Net income attributable to Vicor Corporation (444)   (871)  
Accounting Standards Update 2014-09 [Member] | Balances without adoption of Topic 606 [Member]        
Item Effected [Line Items]        
Net revenues 77,009   215,073  
Cost of revenues 38,456   110,871  
Gross margin 38,553   104,202  
Income before income taxes 12,824   24,767  
Provision for income taxes 220   699  
Consolidated net income 12,604   24,068  
Net income attributable to Vicor Corporation $ 12,568   $ 23,944