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Commitments and Contingencies - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
sqft
Operating leases      
Total area of Vanda's current headquarters in sq ft     21,400
Allowance for tenant improvements   $ 1.9  
Lease termination penalty expense, Rockville     (0.7)
Rent expense 1.1 2.0 2.1
Washington DC Lease
     
Operating leases      
Lease expiration date Jun. 30, 2013    
Office space in Washington, D.C., operating lease termination year 2023    
Renewal term of Lease agreement for Vanda's current headquarters     5 years
Rockville Lease
     
Operating leases      
Rent expense   0.8  
Lease exit liability component   1.3  
Reversal of deferred rent liability component   (0.5)  
Rockville Lease | Research and development
     
Operating leases      
Lease termination penalty expense, Rockville     0.6
Rent expense   0.6  
Rockville Lease | General and Administrative Expense
     
Operating leases      
Lease termination penalty expense, Rockville     0.1
Rent expense   $ 0.2