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Commitments and Contingencies - VQW-765 - Additional Information (Details)	12 Months Ended
	Dec. 31, 2020
VQW-765
Commitments and Contingencies [Line Items]
Future percentage of royalty payments based net sales	mid-teens

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

Future Percentage Of Royalty Payments Based On Net Sales.

+ References

No definition available.

+ Details

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

X

- Details

Name:	us-gaap_TypeOfArrangementAxis=vnda_VQW765Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: