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Summary of Future Intangible Asset Amortization (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Finite-Lived Intangible Assets [Line Items]    
Net Carrying Amount $ 26,724us-gaap_FiniteLivedIntangibleAssetsNet $ 5,037us-gaap_FiniteLivedIntangibleAssetsNet
2015 10,461us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths  
2016 9,624us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo  
2017 411us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree  
2018 411us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour  
2019 411us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive  
Thereafter 5,406us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseAfterYearFive  
Hetlioz    
Finite-Lived Intangible Assets [Line Items]    
Net Carrying Amount 7,461us-gaap_FiniteLivedIntangibleAssetsNet
/ us-gaap_ProductOrServiceAxis
= vnda_HetliozMember
 
2015 411us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths
/ us-gaap_ProductOrServiceAxis
= vnda_HetliozMember
 
2016 411us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo
/ us-gaap_ProductOrServiceAxis
= vnda_HetliozMember
 
2017 411us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree
/ us-gaap_ProductOrServiceAxis
= vnda_HetliozMember
 
2018 411us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour
/ us-gaap_ProductOrServiceAxis
= vnda_HetliozMember
 
2019 411us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive
/ us-gaap_ProductOrServiceAxis
= vnda_HetliozMember
 
Thereafter 5,406us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseAfterYearFive
/ us-gaap_ProductOrServiceAxis
= vnda_HetliozMember
 
Fanapt    
Finite-Lived Intangible Assets [Line Items]    
Net Carrying Amount 19,263us-gaap_FiniteLivedIntangibleAssetsNet
/ us-gaap_ProductOrServiceAxis
= vnda_FanaptMember
5,037us-gaap_FiniteLivedIntangibleAssetsNet
/ us-gaap_ProductOrServiceAxis
= vnda_FanaptMember
2015 10,050us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths
/ us-gaap_ProductOrServiceAxis
= vnda_FanaptMember
 
2016 $ 9,213us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo
/ us-gaap_ProductOrServiceAxis
= vnda_FanaptMember