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Segment Information - Property and Equipment by Geographic Region (Details) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Revenues from External Customers and Long-Lived Assets [Line Items]      
Property and equipment, net $ 17,149 $ 20,144 $ 17,473
United States      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Property and equipment, net 15,362 17,852 14,969
China      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Property and equipment, net $ 1,787 $ 2,292 $ 2,504