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Valuation and Qualifying Accounts (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Allowance for Doubtful Accounts |  |  |
Valuation And Qualifying Accounts Disclosure [Line Items] |  |  |
Balance at Beginning of Period | $ 2,300 | $ 1,263 | $ 46
Additions Charged to Costs and Expenses | 1,002 | 1,035 | 1,216
Foreign exchange impact | (5) | 2 | 1
Balance at End of Period | 3,297 | 2,300 | 1,263
Inventory Reserve |  |  |
Valuation And Qualifying Accounts Disclosure [Line Items] |  |  |
Balance at Beginning of Period | 2,130 | 1,989 | 3,137
Additions Charged to Costs and Expenses | 1,120 | 573 | 476
Balance at End of Period | 2,868 | 2,130 | 1,989
Deductions | $ (382) | $ (432) | $ (1,624)

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