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Income Taxes - Additional Information (Detail)	Sep. 30, 2019 USD ($)
Income Tax Disclosure [Line Items]
Valuation allowance, deferred tax assets	$ 30,031,000

X

- Definition

Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32537-109319

+ Details

Name:	us-gaap_DeferredTaxAssetsValuationAllowance
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Income Tax Disclosure [Line Items]

+ References

No definition available.

+ Details

Name:	vicr_IncomeTaxDisclosureLineItems
Namespace Prefix:	vicr_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration