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Product Warranties - Product Warranty Activity (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Guarantees [Abstract]        
Balance at the beginning of the period $ 270 $ 326 $ 268 $ 290
Accruals for warranties for products sold in the period 29 6 113 139
Fulfillment of warranty obligations (41) (17) (123) (94)
Revisions of estimated obligations   (58)   (78)
Balance at the end of the period $ 258 $ 257 $ 258 $ 257