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Basis of Presentation and Summary Accounting Policies - Additional Information (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017 | Dec. 31, 2017 | Dec. 31, 2016
Schedule Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Percentage of total annual net sales in the third and fourth quarters |  |  |  |  | 60.00% | 61.00%
Restructuring charges | $ 395 | $ 254 | $ 801 | $ 254 |  |
Employee Severance |  |  |  |  |  |
Schedule Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Restructuring charges | 400 |  | 800 |  |  |
Accrued restructuring change | 400 |  | 400 |  |  |
Receivables Purchase Agreement |  |  |  |  |  |
Schedule Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Sale of receivable | 19,100 | 17,600 | 38,700 | 39,200 |  |
Receivables Purchase Agreement | Selling, General and Administrative Expenses |  |  |  |  |  |
Schedule Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Charge related to sale of receivables | $ 99 | $ 63 | $ 189 | $ 130 |  |

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