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Inventories - Additional Information (Detail) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Inventory Disclosure [Abstract]        
Amounts credited to the allowance for obsolete inventory $ 100 $ 200 $ 256 $ 308