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Accounts Receivable - Additional Information (Detail) (USD $)
3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Receivables [Abstract]        
Provision for doubtful accounts $ 29,000 $ 100,000 $ 100,000 $ 100,000