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Product Warranty Reserve - Roll Forward of Product Warranty Reserve (Detail) - Warranty Reserves [Member] - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Valuation and Qualifying Accounts Disclosure [Line Items]    
Beginning of period balance $ 928 $ 1,076
Additions charged to income 4 8
Warranty usage (43) (16)
Currency translation 9 4
End of period balance $ 898 $ 1,072