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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, 2020
Jun. 30, 2019
Valuation and Qualifying Accounts Disclosure [Line Items]    
Beginning of period balance $ 1,309 $ 928
Additions charged to income 48 506
Warranty usage (28) (5)
Currency translation (87) 1
End of period balance $ 1,242 $ 1,430