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Balance Sheet Components - Property and Equipment, net (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Property Plant And Equipment [Line Items]    
Property and equipment, gross $ 837us-gaap_PropertyPlantAndEquipmentGross $ 71us-gaap_PropertyPlantAndEquipmentGross
Less: Accumulated depreciation and amortization (124)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment (50)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment
Property and equipment, net 714us-gaap_PropertyPlantAndEquipmentNet 21us-gaap_PropertyPlantAndEquipmentNet
Equipment and Furniture [Member]    
Property Plant And Equipment [Line Items]    
Property and equipment, gross 706us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= vsar_EquipmentAndFurnitureMember		 50us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= vsar_EquipmentAndFurnitureMember
Buildings, Leasehold and Building Improvements [Member]    
Property Plant And Equipment [Line Items]    
Property and equipment, gross $ 132us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= vsar_BuildingsLeaseholdAndBuildingImprovementsMember		 $ 21us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= vsar_BuildingsLeaseholdAndBuildingImprovementsMember