Stock-Based Compensation and Employee Benefit Plans - Summary of the Activity under the 2000 Plan (Detail) - Vicor Plan [Member] - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Options Outstanding, Beginning balance	1,848,067
Options Outstanding, Granted	83,817
Options Outstanding, Forfeited and expired	(18,737)
Options Outstanding, Exercised	(216,925)
Options Outstanding, Ending balance	1,696,222
Options Outstanding, Exercisable	730,388	565,861	306,173
Options Outstanding, Vested or expected to vest	1,646,808
Weighted Average Exercise Price, Beginning balance	$ 8.57
Weighted Average Exercise Price, Granted	10.32
Weighted Average Exercise Price, Forfeited and expired	9.21
Weighted Average Exercise Price, Exercised	7.25
Weighted Average Exercise Price, Ending balance	8.82
Weighted Average Exercise Price, Exercisable	7.74	$ 7.24	$ 6.90
Weighted Average Exercise Price, Vested or expected to vest	$ 8.76
Weighted-Average Remaining Contractual Life in Years, Outstanding	6 years 9 months 29 days
Weighted-Average Remaining Contractual Life in Years, Exercisable	6 years 6 months 4 days
Weighted-Average Remaining Contractual Life in Years, Vested or expected to vest	6 years 9 months 26 days
Aggregate Intrinsic Value, Outstanding	$ 10,661
Aggregate Intrinsic Value, Exercisable	5,375
Aggregate Intrinsic Value, Vested or expected to vest	$ 10,437