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Accounts Receivable - Additional Information (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Receivables [Abstract]    
Provision for doubtful accounts $ 45us-gaap_ProvisionForDoubtfulAccounts $ 100us-gaap_ProvisionForDoubtfulAccounts