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Loan Receivable - Carrying Value of Term Loan Facility (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Loans Receivable Net [Abstract]    
15% Term loan facility $ 1,000us-gaap_LoansReceivableCommercialAndIndustrial $ 1,000us-gaap_LoansReceivableCommercialAndIndustrial
Unamortized discount (94)us-gaap_LoansAndLeasesReceivableDeferredIncomeCommercial (110)us-gaap_LoansAndLeasesReceivableDeferredIncomeCommercial
Accrued interest 362us-gaap_InterestReceivable 185us-gaap_InterestReceivable
Net carrying amount $ 1,268us-gaap_LoansReceivableNet $ 1,075us-gaap_LoansReceivableNet