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Segment and Geographic Information - Schedule of Long Lived Assets by Geographic Area (Detail) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Revenues From External Customers And Long Lived Assets [Line Items]    
Property and equipment, net $ 129,476 $ 123,657
United States [Member]    
Revenues From External Customers And Long Lived Assets [Line Items]    
Property and equipment, net 107,228 109,886
China [Member]    
Revenues From External Customers And Long Lived Assets [Line Items]    
Property and equipment, net $ 22,248 $ 13,771