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Operating Leases - Future Minimum Lease Payments under Operating Leases (Detail) (USD $)
Mar. 31, 2015
Leases [Abstract]  
Remainder of 2015 $ 522,000us-gaap_OperatingLeasesFutureMinimumPaymentsRemainderOfFiscalYear
2016 696,000us-gaap_OperatingLeasesFutureMinimumPaymentsDueInTwoYears
2017 696,000us-gaap_OperatingLeasesFutureMinimumPaymentsDueInThreeYears
2018 632,000us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFourYears
2019 596,000us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFiveYears
Thereafter 2,965,000us-gaap_OperatingLeasesFutureMinimumPaymentsDueThereafter
Total future lease payments due $ 6,107,000us-gaap_OperatingLeasesFutureMinimumPaymentsDue