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Accounts Receivable - Accounts Receivable (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Receivables [Abstract]    
Accounts receivable $ 1,742us-gaap_AccountsReceivableGrossCurrent $ 1,563us-gaap_AccountsReceivableGrossCurrent
Less allowance for doubtful accounts 0us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent 0us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent
Total accounts receivable, net $ 1,742us-gaap_AccountsReceivableNetCurrent $ 1,563us-gaap_AccountsReceivableNetCurrent