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Segment Information and Information about Geographic Areas - Property and Equipment, Net By Geographic Area (Detail) - USD ($)
$ in Thousands
Sep. 30, 2016
Dec. 31, 2015
Revenues from External Customers and Long-Lived Assets [Line Items]    
Property and equipment, net $ 8,009 $ 7,532
United States [Member]    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Property and equipment, net 6,946 6,633
Other [Member]    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Property and equipment, net $ 1,063 $ 899