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Schedule II - Valuation and Qualifying Accounts (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Allowance for Doubtful Accounts [Member] |  |  |
Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |
Balance at beginning of period | $ 2,652 | $ 2,910 | $ 2,815
Additions charged to costs and expenses | 1,294 | 449 | 472
Deductions | (697) | (529) | (432)
Other additions or deductions | (25) | (178) | 55
Balance at end of period | 3,224 | 2,652 | 2,910
Reserve for Credit Memos [Member] |  |  |
Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |
Balance at beginning of period | 526 | 415 | 395
Additions charged to costs and expenses | 817 | 802 | 693
Deductions | (739) | (688) | (675)
Other additions or deductions | 21 | (3) | 2
Balance at end of period | 625 | 526 | 415
Slow-Moving and Obsolete Inventory Reserve [Member] |  |  |
Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |
Balance at beginning of period | 8,462 | 9,066 | 11,560
Additions charged to costs and expenses | 1,283 | 1,341 | 998
Deductions | (1,104) | (1,658) | (3,855)
Other additions or deductions | 236 | (287) | 363
Balance at end of period | 8,877 | 8,462 | 9,066
Accrued Product Warranty [Member] |  |  |
Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |
Balance at beginning of period | 928 | 1,076 | 1,058
Additions charged to costs and expenses | 481 | 97 | 347
Deductions | (317) | (133) | (399)
Other additions or deductions | 217 | (112) | 70
Balance at end of period | 1,309 | 928 | 1,076
Foreign Net Operating Loss Tax Carryforwards [Member] |  |  |
Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |
Balance at beginning of period | 3,495 | 3,965 | 3,805
Additions charged to costs and expenses | 153 | 568 | 490
Deductions | (499) | (761) | (312)
Other additions or deductions | (12) | (277) | (18)
Balance at end of period | $ 3,137 | $ 3,495 | $ 3,965

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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) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24092-122690 + Details
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