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Schedule II - 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 [Member] |  |  |
Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |
Balance at beginning of period | $ 3,224 | $ 2,652 | $ 2,910
Additions charged to costs and expenses | 1,279 | 1,294 | 449
Deductions | (1,527) | (697) | (529)
Other additions or deductions | (128) | (25) | (178)
Balance at end of period | 2,848 | 3,224 | 2,652
Reserve for Credit Memos [Member] |  |  |
Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |
Balance at beginning of period | 625 | 526 | 415
Additions charged to costs and expenses | 774 | 817 | 802
Deductions | (792) | (739) | (688)
Other additions or deductions | 9 | 21 | (3)
Balance at end of period | 616 | 625 | 526
Slow-Moving and Obsolete Inventory Reserve [Member] |  |  |
Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |
Balance at beginning of period | 8,877 | 8,462 | 9,066
Additions charged to costs and expenses | 2,035 | 1,283 | 1,341
Deductions | (1,097) | (1,104) | (1,658)
Other additions or deductions | 85 | 236 | (287)
Balance at end of period | 9,900 | 8,877 | 8,462
Accrued Product Warranty [Member] |  |  |
Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |
Balance at beginning of period | 1,309 | 928 | 1,076
Additions charged to costs and expenses | 279 | 481 | 97
Deductions | (314) | (317) | (133)
Other additions or deductions | 8 | 217 | (112)
Balance at end of period | 1,282 | 1,309 | 928
Foreign Net Operating Loss Tax Carryforwards [Member] |  |  |
Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |
Balance at beginning of period | 3,137 | 3,495 | 3,965
Additions charged to costs and expenses | 1,176 | 153 | 568
Deductions | (1,473) | (499) | (761)
Other additions or deductions | 72 | (12) | (277)
Balance at end of period | $ 2,912 | $ 3,137 | $ 3,495

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- Definition Amount of valuation and qualifying accounts and reserves. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SX 210.12-09(Column B)) -URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e24092-122690 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SX 210.12-09(Column E)) -URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e24092-122690 + Details
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