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Valuation and Qualifying Accounts (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Allowance for Doubtful Accounts      
Valuation And Qualifying Accounts Disclosure [Line Items]      
Balance at Beginning of Period $ 1,263 $ 46 $ 42
Additions Charged to Costs and Expenses 1,035 1,217 31
Deductions     (27)
Foreign exchange impact 2    
Balance at End of Period 2,300 1,263 46
Inventory Reserve      
Valuation And Qualifying Accounts Disclosure [Line Items]      
Balance at Beginning of Period 1,989 3,137 3,594
Additions Charged to Costs and Expenses 573 476  
Deductions (432) (1,624) (457)
Balance at End of Period $ 2,130 $ 1,989 $ 3,137