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Significant Accounting Policies - Additional Information (Detail) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 USD ($) Segment shares | Dec. 31, 2016 USD ($) shares | Dec. 31, 2015 USD ($) shares | Jan. 01, 2017 USD ($)
Significant Accounting Policies [Line Items] |  |  |  |
Number of operating segments | Segment | 1 |  |  |
Goodwill impairment losses | $ 0 | $ 0 | $ 0 |
Provision for estimated sales returns, rebates, stock rotations, and other customer rights | 8,978,000 | 16,104,000 |  |
Severance expenses | $ 10,180,000 | 8,165,000 | 7,140,000 |
Maximum percentage of annual compensation contributed by employees towards employee benefit plan | 50.00% |  |  |
Maximum amount contributed by employees toward employee benefit plan | $ 18,000 |  |  |
Additional amount contributed by employees aged 50 and over towards employee benefit plan | $ 6,000 |  |  |
Percentage of employee contributions contributed by employer towards employee benefit plan | 50.00% |  |  |
Maximum percentage of employee's eligible compensation | 6.00% |  |  |
Contributions by employer | $ 3,613,000 | 2,290,000 | 1,397,000 |
Minimum percentage of tax benefit realized upon settlement | 50.00% |  |  |
Advertising expenses | $ 1,764,000 | 3,127,000 | 2,311,000 |
Allowance for doubtful accounts | 1,911,000 | 2,255,000 |  |
Bad debt expense (income) | (344,000) | 154,000 | (1,834,000) |
Write off of bad debts | $ 29,000 | $ 0 | $ 123,000 |
Anti-dilutive shares excluded from computation of earnings per share amount | shares | 1,640,329 | 4,232,063 | 1,594,082 |
Manufacturing partner and supplier liabilities |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Significant costs associated with exposure | $ 0 | $ 0 |  |
Accounting Standards Update 2016-09 | Retained earnings | Forfeitures |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Cumulative-effect net of tax adjustment to increase (decrease) retained earnings |  |  |  | $ (2,149,000)
Accounting Standards Update 2016-09 | Retained earnings | Income Tax Accounting |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Cumulative-effect net of tax adjustment to increase (decrease) retained earnings |  |  |  | $ 86,132,000
Foreign Exchange Forward Contracts | Not Designated as Hedging Instrument |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Derivative, notional amount | 338,053,000 | 153,318,000 |  |
Gains (losses) from derivatives not designated as hedge | 107,000 | 10,000 |  |
Foreign Exchange Forward Contracts | Designated as Hedging Instrument | Cash Flow Hedging |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Derivative, notional amount | 7,354,000 | 51,970,000 |  |
Other comprehensive income, gain (loss) on outstanding forward contracts | 267,000 | 53,000 |  |
Foreign Exchange Forward Contracts | Financial Income | Not Designated as Hedging Instrument |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Derivative, net gain (loss) | 25,086,000 | 1,822,000 | $ 378,000 |
Foreign Exchange Forward Contracts | Operating Expenses | Designated as Hedging Instrument | Cash Flow Hedging |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Derivative, net gain (loss) | $ 4,655,000 | $ 120,000 | $ (1,585,000) |
Minimum |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Estimated useful lives of intangible assets | 8 years |  |  |
Maximum |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Estimated useful lives of intangible assets | 20 years |  |  |

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