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Geographic, Customer and Supplier Information - Additional Information (Detail) | 12 Months Ended
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Dec. 31, 2016 Country Customer Vendor | Dec. 31, 2015 | Dec. 31, 2014
Revenue, Major Customer [Line Items] |  |  |
Geographic regions | Country | 4 |  |
Number of independent vendors | Vendor | 4 |  |
Top ten customers contribution of total worldwide revenue | 36.00% | 50.00% | 46.00%
Number of customers contributed | Customer | 10 |  |
Sales Revenue, Net [Member] | Customer Concentration Risk [Member] | Customer One [Member] |  |  |
Revenue, Major Customer [Line Items] |  |  |
Percentage of revenue contributed by customer |  | 30.00% | 12.00%
Sales Revenue, Net [Member] | Customer Concentration Risk [Member] | Customer Two [Member] |  |  |
Revenue, Major Customer [Line Items] |  |  |
Percentage of revenue contributed by customer |  |  | 11.00%

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