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Commitments and Contingencies - Fanapt - Additional Information (Details) - Fanapt®		60 Months Ended
	Dec. 31, 2014	Dec. 31, 2019
Commitments and Contingencies [Line Items]
Royalty payment period	10 years
Royalty payable percentage on net sales	6.00%	3.00%

X

- Definition

Commitments and contingencies.

+ References

No definition available.

+ Details

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

X

- 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:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

X

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