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Breakdown of Revenue and Non-Current Assets by Geographical Areas - Other Information (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Revenues from External Customers and Long-Lived Assets [Line Items]    
Non-current assets $ 280,625 $ 257,961
Americas    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Non-current assets 100,435 113,272
United States    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Non-current assets 100,073 112,685
EMEA    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Non-current assets 29,423 18,850
Asia-Pacific    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Non-current assets 21,841 25,020
Japan    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Non-current assets 12,317 10,141
Singapore    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Non-current assets 4,871 10,085
Holding    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Non-current assets $ 128,926 $ 100,819