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Segment Information - Additional Information (Detail) | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Segment Reporting Information [Line Items] |  |  |
Number of customers | 1 | 1 | 1
Sales Revenue, Net [Member] | Customer Concentration Risk [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Percentage of total net revenues | 13.40% | 13.00% | 16.40%
Sales Revenue, Net [Member] | Customer Concentration Risk [Member] | China [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Percentage of total net revenues | 37.40% | 35.80% | 32.10%

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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