Name:	us-gaap_FiniteLivedIntangibleAssetsPeriodIncreaseDecrease
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	na
Period Type:	duration

The cash outflow to acquire asset without physical form usually arising from contractual or other legal rights, excluding goodwill.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 13
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3213-108585

Name:	us-gaap_PaymentsToAcquireIntangibleAssets
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Data Type:	xbrli:monetaryItemType
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Period Type:	duration

Net cumulative worldwide sales to achieve milestone and trigger payment of milestone obligation.

No definition available.

Name:	vnda_CumulativeNetSalesToAchieveMilestone
Namespace Prefix:	vnda_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

Hetlioz [Abstract]

No definition available.

Name:	vnda_HetliozAbstract
Namespace Prefix:	vnda_
Data Type:	xbrli:stringItemType
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Carrying value as of the balance sheet for accrued non-current liability relating to an obligation to make a probable future milestone payment that would become due and payable when cumulative sales of a product reaches a certain agreed upon sales threshold.

No definition available.

Name:	vnda_MilestoneObligationUnderLicenseAgreement
Namespace Prefix:	vnda_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Percentage of sublicense fees payable to third party under a contractual arrangement for use of technology or intellectual property.

No definition available.

Name:	vnda_PercentageOfFutureSublicenseFeesPayable
Namespace Prefix:	vnda_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

Royalty payable percentage under a contractual arrangement for use of technology or intellectual property.

No definition available.