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Leases - Additional Information (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Leases [Abstract]    
Lease expiration year 2020  
Rental expense $ 143us-gaap_LeaseAndRentalExpense $ 122us-gaap_LeaseAndRentalExpense