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Commitment And Contingent Liabilities - Additional Information (Detail) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Operating Leased Assets [Line Items]      
Rent expenses $ 2,309us-gaap_OperatingLeasesRentExpenseNet $ 1,303us-gaap_OperatingLeasesRentExpenseNet $ 897us-gaap_OperatingLeasesRentExpenseNet
Pledged bank deposit for office lease agreement and hedging transaction 839us-gaap_SecurityDeposit    
Bank guarantee, office lease agreement 222us-gaap_GuarantyAssets    
Lease of Motor Vehicles      
Operating Leased Assets [Line Items]      
Rent expenses $ 369us-gaap_OperatingLeasesRentExpenseNet
/ us-gaap_MajorPropertyClassAxis
= us-gaap_VehiclesMember
$ 386us-gaap_OperatingLeasesRentExpenseNet
/ us-gaap_MajorPropertyClassAxis
= us-gaap_VehiclesMember
$ 305us-gaap_OperatingLeasesRentExpenseNet
/ us-gaap_MajorPropertyClassAxis
= us-gaap_VehiclesMember