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Product Warranties - Product Warranty Activity (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Guarantees [Abstract]        
Balance at the beginning of the period $ 332 $ 225 $ 204 $ 283
Accruals for warranties for products sold in the period 280 76 465 159
Fulfillment of warranty obligations (18) (98) (75) (230)
Revisions of estimated obligations   (1)   (10)
Balance at the end of the period $ 594 $ 202 $ 594 $ 202