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Segment Reporting, Geographic Information, and Significant Customers - Summary of Geographic Revenue as Percentage of Total Revenues by Country (Parenthetical) (Detail) (Maximum [Member], Net Revenues [Member])
12 Months Ended
Dec. 31, 2014
Maximum [Member] | Net Revenues [Member]
 
Concentration Risk [Line Items]  
Revenue by countries, in percentage 10.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueNetMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember