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Accounts Receivable - Additional Information (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Receivables [Abstract]        
Provision for doubtful accounts $ 25 $ 10 $ 100 $ (26)