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Accounts Receivable - Additional Information (Detail) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Receivables [Abstract]        
Provision for doubtful accounts $ 24 $ 25 $ 100 $ 100