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Stock-Based Compensation and Employee Benefit Plans - Summary of the Activity under the 2000 Plan (Detail) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Options transferred in merger with Vicor Weighted Average Exercise Price $ 6.79    
2000 Plan, Vicor [Member]      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Options Outstanding, Beginning balance 1,382,981    
Options Outstanding, Granted 115,753    
Options transferred from VI Chip Merger 1,476,371    
Options Outstanding, Forfeited and expired (36,228)    
Options Outstanding, Exercised (250,981)    
Options Outstanding, Ending balance 2,687,896    
Options Outstanding, Exercisable 1,475,947 888,257 707,244
Options Outstanding, Vested or expected to vest 2,601,076    
Weighted Average Exercise Price, Beginning balance $ 13.41    
Weighted Average Exercise Price, Granted 31.76    
Weighted Average Exercise Price, Forfeited and expired 21.37    
Weighted Average Exercise Price, Exercised 9.71    
Weighted Average Exercise Price, Ending balance 10.81    
Weighted Average Exercise Price, Exercisable 8.74 $ 8.93 $ 8.01
Weighted Average Exercise Price, Vested or expected to vest $ 10.65    
Weighted-Average Remaining Contractual Life in Years, Outstanding 4 years 7 months 24 days    
Weighted-Average Remaining Contractual Life in Years, Exercisable 4 years 1 month 6 days    
Weighted-Average Remaining Contractual Life in Years, Vested or expected to vest 4 years 7 months 13 days    
Aggregate Intrinsic Value, Outstanding $ 96,665    
Aggregate Intrinsic Value, Exercisable 56,079    
Aggregate Intrinsic Value, Vested or expected to vest $ 93,938