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Commitments - Summary of Future Minimum Lease Payments under Non-cancelable Operating Leases (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Commitments And Contingencies Disclosure [Abstract]  
2015 $ 954us-gaap_OperatingLeasesFutureMinimumPaymentsDueCurrent
2016 160us-gaap_OperatingLeasesFutureMinimumPaymentsDueInTwoYears
Total $ 1,114us-gaap_OperatingLeasesFutureMinimumPaymentsDue