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Stock-Based Compensation and Employee Benefit Plans - Summary of the Activity under the VI Chip Stock Option Plans (Parenthetical) (Detail) - Vi Chip Plan [Member] | 12 Months Ended
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Dec. 31, 2017 shares
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
Granted, shares | 9,771,500
Chief Executive Officer [Member] |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
Granted, shares | 5,500,000

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Gross number of share options (or share units) granted during the period. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
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Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_PlanNameAxis=vicr_ViChipPlanMember
Namespace Prefix: |
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Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |