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Summary of Intangible Assets (Detail) (USD $)
In Thousands, unless otherwise specified
1 Months Ended 12 Months Ended
Dec. 31, 2014
Dec. 31, 2014
Dec. 31, 2013
Finite-Lived Intangible Assets [Line Items]      
Estimated Patent life end date   2016-11  
Net Carrying Amount $ 26,724us-gaap_FiniteLivedIntangibleAssetsNet $ 26,724us-gaap_FiniteLivedIntangibleAssetsNet $ 5,037us-gaap_FiniteLivedIntangibleAssetsNet
Hetlioz      
Finite-Lived Intangible Assets [Line Items]      
Estimated Patent life end date   2033-01  
Gross Carrying Amount 8,000us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_ProductOrServiceAxis
= vnda_HetliozMember
8,000us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_ProductOrServiceAxis
= vnda_HetliozMember
 
Accumulated Amortization 539us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_ProductOrServiceAxis
= vnda_HetliozMember
539us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_ProductOrServiceAxis
= vnda_HetliozMember
 
Net Carrying Amount 7,461us-gaap_FiniteLivedIntangibleAssetsNet
/ us-gaap_ProductOrServiceAxis
= vnda_HetliozMember
7,461us-gaap_FiniteLivedIntangibleAssetsNet
/ us-gaap_ProductOrServiceAxis
= vnda_HetliozMember
 
Fanapt      
Finite-Lived Intangible Assets [Line Items]      
Estimated Patent life end date 2027-11 2016-11 2016-11
Gross Carrying Amount 27,941us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_ProductOrServiceAxis
= vnda_FanaptMember
27,941us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_ProductOrServiceAxis
= vnda_FanaptMember
12,000us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_ProductOrServiceAxis
= vnda_FanaptMember
Accumulated Amortization 8,678us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_ProductOrServiceAxis
= vnda_FanaptMember
8,678us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_ProductOrServiceAxis
= vnda_FanaptMember
6,963us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_ProductOrServiceAxis
= vnda_FanaptMember
Net Carrying Amount $ 19,263us-gaap_FiniteLivedIntangibleAssetsNet
/ us-gaap_ProductOrServiceAxis
= vnda_FanaptMember
$ 19,263us-gaap_FiniteLivedIntangibleAssetsNet
/ us-gaap_ProductOrServiceAxis
= vnda_FanaptMember
$ 5,037us-gaap_FiniteLivedIntangibleAssetsNet
/ us-gaap_ProductOrServiceAxis
= vnda_FanaptMember