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Product Warranty Reserve - Roll Forward of Product Warranty Reserve (Detail) - Warranty Reserves [Member] - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Valuation and Qualifying Accounts Disclosure [Line Items]    
Beginning of period balance $ 928 $ 1,076
Additions charged to income 506 14
Warranty usage (5) (143)
Currency translation 1 (68)
End of period balance $ 1,430 $ 879