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Commitments and Contingencies - Future Minimum Commitment on the Remaining Operating Lease (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Commitments and Contingencies Disclosure [Abstract]  
2015 $ 301us-gaap_OperatingLeasesFutureMinimumPaymentsReceivableCurrent
2016 325us-gaap_OperatingLeasesFutureMinimumPaymentsReceivableInTwoYears
2017 325us-gaap_OperatingLeasesFutureMinimumPaymentsReceivableInThreeYears
2018 325us-gaap_OperatingLeasesFutureMinimumPaymentsReceivableInFourYears
2019 325us-gaap_OperatingLeasesFutureMinimumPaymentsReceivableInFiveYears
Thereafter 839us-gaap_OperatingLeasesFutureMinimumPaymentsReceivableThereafter
Total operating lease $ 2,440us-gaap_OperatingLeasesFutureMinimumPaymentsReceivable