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Commitments and Contingencies - (Fanapt) - Additional Information (Detail)	3 Months Ended
	Mar. 31, 2020
November 16,2016 through December 31,2019
Fanapt
Royalty payable percentage on net sales	3.00%
Fanapt®
Fanapt
Royalty payable percentage on net sales	6.00%
Royalty payment period	10 years

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- Definition

Fanapt [Abstract]

+ References

No definition available.

+ Details

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

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- Definition

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

+ References

No definition available.

+ Details

Name:	vnda_RoyaltyPayableOnNetSalesPercentage
Namespace Prefix:	vnda_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

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- Definition

Royalty Period

+ References

No definition available.

+ Details

Name:	vnda_RoyaltyPeriod
Namespace Prefix:	vnda_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	vnda_StatementScenarioSecondaryAxis=vnda_ScenarioFourMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_ProductOrServiceAxis=vnda_FanaptMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: