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Commitments and Contingencies (Textual 1 - Consulting Agreement) - Additional Information (Detail) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Consulting Fees      
Research and development $ 19,230us-gaap_ResearchAndDevelopmentExpense $ 28,502us-gaap_ResearchAndDevelopmentExpense $ 45,764us-gaap_ResearchAndDevelopmentExpense
Consulting Agreement      
Consulting Fees      
Research and development $ 2,000us-gaap_ResearchAndDevelopmentExpense
/ vnda_AgreementWithPartiesAxis
= vnda_ConsultingAgreementMember
$ 500us-gaap_ResearchAndDevelopmentExpense
/ vnda_AgreementWithPartiesAxis
= vnda_ConsultingAgreementMember