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Summary of Significant Accounting Policies - Future Minimum Capital Lease Payments (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Summary Of Significant Accounting Policies - Future Minimum Capital Lease Payments Detail  
2015 $ 572us-gaap_CapitalLeasesFutureMinimumPaymentsDueCurrent
2016 173us-gaap_CapitalLeasesFutureMinimumPaymentsDueInTwoYears
2017   
2018   
Thereafter   
Total minimum lease payments 745us-gaap_CapitalLeasesFutureMinimumPaymentsDue
Less: Amount representing interest (141)us-gaap_CapitalLeasesFutureMinimumPaymentsInterestIncludedInPayments [1]
Present value of minimum lease payments $ 604us-gaap_CapitalLeasesFutureMinimumPaymentsPresentValueOfNetMinimumPayments
[1] Amount to reduce minimum lease payments to fair value as calculated by the imputed interest rate at lease inception since the present value of the minimum lease payments as calculated by the incremental borrowing rate exceeded fair value at inception of the leases.