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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, 2020
Dec. 31, 2019
Dec. 31, 2018
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Options Outstanding, Beginning balance 2,687,896    
Options Outstanding, Granted 354,075    
Options Outstanding, Forfeited and expired (69,987)    
Options Outstanding, Exercised (948,507)    
Options Outstanding, Ending balance 2,023,477    
Options Outstanding, Exercisable 924,964 1,475,947 888,257
Options Outstanding, Vested or expected to vest 1,947,127    
Weighted Average Exercise Price, Beginning balance $ 10.81    
Weighted Average Exercise Price, Granted 68.34    
Weighted Average Exercise Price, Forfeited and expired 23.77    
Weighted Average Exercise Price, Exercised 9.62    
Weighted Average Exercise Price, Ending balance 20.98    
Weighted Average Exercise Price, Exercisable 9.05 $ 8.74 $ 8.93
Weighted Average Exercise Price, Vested or expected to vest $ 20.22    
Weighted-Average Remaining Contractual Life in Years, Outstanding 4 years 10 months 13 days    
Weighted-Average Remaining Contractual Life in Years, Exercisable 3 years 4 months 28 days    
Weighted-Average Remaining Contractual Life in Years, Vested or expected to vest 4 years 9 months 14 days    
Aggregate Intrinsic Value, Outstanding $ 144,153    
Aggregate Intrinsic Value, Exercisable 76,932    
Aggregate Intrinsic Value, Vested or expected to vest $ 140,186