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Stock-Based Compensation and Employee Benefit Plans - Additional Information (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Term of Option	10 years
Employee's compensation plan	The Company matches employee contributions to the plan at a rate of 50%, up to the first 3% of an employee’s compensation.
Employee contributions	20.00%
Company contribution to the plan	$ 1,031,000	$ 1,001,000	$ 976,000
Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Employees pre-tax salary	1.00%
Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Employees pre-tax salary	80.00%
2000 Plan, Vicor [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common Stock reserved for issuance	10,000,000
Non-qualified stock options granted to non-employees	85.00%
Annual forfeiture rate	5.25%	5.25%	5.25%
Share exercisable	924,964	1,475,947	888,257
Weighted average exercise prices	$ 9.05	$ 8.74	$ 8.93
Total Intrinsic value	$ 50,410,000	$ 6,636,000	$ 22,938,000
Options Exercised	9,127,000	2,437,000	6,782,000
Fair value of stock options that vested	10,847,000	$ 1,657,000	$ 2,921,000
Total unrecognized compensation cost	$ 9,758,000
Compensation cost recognized over a weighted-average period	1 year 7 months 6 days
Expected recognized expenses, Year One	$ 4,656,000
Expected recognized expenses, Year Two	2,741,000
Expected recognized expenses, Year Three	1,396,000
Expected recognized expenses, Year Four	682,000
Expected recognized expenses, Year Five	$ 283,000
Weighted-average fair value	$ 30.63	$ 14.30	$ 17.46
Stock Bonus Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock purchase by non-employees	109,964
2017 Employee Stock Purchase Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Non-qualified stock options granted to non-employees	85.00%
Maximum number of shares authorized for issuances	2,000,000
Maximum percentage of payroll deductions on employee's compensation	15.00%
Offering period of employee stock purchase plan	6 months

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Aggregate number of common shares reserved for future issuance.

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