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Schedule II - Valuation and Qualifying Accounts (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Allowance for Doubtful Accounts [Member] |  |  |
Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |
Balance at beginning of period | $ 1,943 | $ 1,441 | $ 1,395
Additions charged to costs and expenses | 524 | 803 | 419
Deductions | (414) | (260) | (368)
Other additions or deductions | (182) | (41) | (5)
Balance at end of period | 1,871 | 1,943 | 1,441
Reserve for Credit Memos [Member] |  |  |
Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |
Balance at beginning of period | 428 | 672 | 644
Additions charged to costs and expenses | 437 | 408 | 418
Deductions | (408) | (652) | (390)
Other additions or deductions | (2) | 0 | 0
Balance at end of period | 455 | 428 | 672
Slow-Moving and Obsolete Inventory Reserve [Member] |  |  |
Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |
Balance at beginning of period | 9,183 | 8,075 | 6,773
Additions charged to costs and expenses | 2,477 | 2,244 | 2,672
Deductions | (1,509) | (701) | (1,006)
Other additions or deductions | 79 | (435) | (364)
Balance at end of period | 10,230 | 9,183 | 8,075
Accrued Product Warranty [Member] |  |  |
Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |
Balance at beginning of period | 892 | 1,140 | 1,229
Additions charged to costs and expenses | 74 | (45) | 443
Deductions | (158) | (133) | (475)
Other additions or deductions | (94) | (70) | (57)
Balance at end of period | 714 | 892 | 1,140
U.S.Tax Capital Loss [Member] |  |  |
Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |
Balance at beginning of period |  | 0 | 2,034
Additions charged to costs and expenses |  |  | 0
Deductions |  |  | (49)
Other additions or deductions |  |  | (1,985)
Balance at end of period |  |  | 0
Foreign Net Operating Loss Tax Carryforwards [Member] |  |  |
Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |
Balance at beginning of period | 3,614 | 1,420 | 295
Additions charged to costs and expenses | 2,105 | 2,553 | 1,310
Deductions | (287) | (232) | (115)
Other additions or deductions | (223) | (127) | (70)
Balance at end of period | $ 5,209 | $ 3,614 | $ 1,420

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- Definition Total of the deductions in a given period to allowances and reserves, the valuation and qualifying accounts that are either netted against the cost of an asset (in order to value it at its carrying value) or that reflect a liability established to represent expected future costs, representing receivables written off as uncollectible and portions of the reserves utilized, respectively. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24092-122690 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 09 -Article 12 + Details
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