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Description of the Company and Summary of Significant Accounting Policies - Summary of Inventory Reserve Activity (Detail) - Inventory Valuation Reserve [Member] - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2015 | Dec. 31, 2014
Inventory [Line Items] |  |
Balance at beginning of year | $ 1,759 | $ 1,510
Charged to expense | 945 | 679
Write-offs | (364) | (430)
Balance at end of year | $ 2,340 | $ 1,759

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