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Product Warranties - Product Warranty Activity (Detail) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Guarantees [Abstract]    
Balance at the beginning of the period $ 584 $ 204
Accruals for warranties for products sold in the period 122 15
Fulfillment of warranty obligations (68) (32)
Revisions of estimated obligations (50)  
Balance at the end of the period $ 588 $ 187