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Stock-Based Compensation and Employee Benefit Plans - Summary of the Activity under the 2000 Plan (Detail) - 2000 Plan, Vicor [Member] - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Options Outstanding, Beginning balance 1,365,917    
Options Outstanding, Granted 684,077    
Options Outstanding, Forfeited and expired (25,923)    
Options Outstanding, Exercised (641,090)    
Options Outstanding, Ending balance 1,382,981 1,365,917  
Options Outstanding, Exercisable 888,257 707,244 730,388
Options Outstanding, Vested or expected to vest 1,345,938    
Weighted Average Exercise Price, Beginning balance $ 9.63    
Weighted Average Exercise Price, Granted 18.40    
Weighted Average Exercise Price, Forfeited and expired 16.08    
Weighted Average Exercise Price, Exercised 10.58    
Weighted Average Exercise Price, Ending balance 13.41 $ 9.63  
Weighted Average Exercise Price, Exercisable 8.93 $ 8.01 $ 7.74
Weighted Average Exercise Price, Vested or expected to vest $ 13.07    
Weighted-Average Remaining Contractual Life in Years, Outstanding 5 years 4 months 24 days    
Weighted-Average Remaining Contractual Life in Years, Exercisable 4 years 5 months 16 days    
Weighted-Average Remaining Contractual Life in Years, Vested or expected to vest 5 years 4 months 2 days    
Aggregate Intrinsic Value, Outstanding $ 34,329    
Aggregate Intrinsic Value, Exercisable 25,635    
Aggregate Intrinsic Value, Vested or expected to vest $ 33,820