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

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

No definition available.

Name:	vnda_RoyaltyPayableOnNetSalesPercentage
Namespace Prefix:	vnda_
Data Type:	dtr-types1:percentItemType
Balance Type:	na
Period Type:	duration