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Commitments and Contingent Liabilities - Future Minimum Rental Payments under Operating Leases (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Commitments and Contingencies Disclosure [Abstract]  
2015 $ 96us-gaap_OperatingLeasesFutureMinimumPaymentsDueCurrent
2016 50us-gaap_OperatingLeasesFutureMinimumPaymentsDueInTwoYears
2017 $ 22us-gaap_OperatingLeasesFutureMinimumPaymentsDueInThreeYears