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Warranty Obligations - Changes in Warranty Obligations (Detail)
$ in Thousands
6 Months Ended
Jun. 30, 2019
USD ($)
Movement in Standard Product Warranty Accrual [Roll Forward]  
Beginning balance $ 4,743
Provisions for warranties issued during the period 2,533
Fulfillment of warranty obligations (1,824)
Ending balance $ 5,452