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Entity Wide Disclosures - Summary of Property and Equipment, Net by Geographic Region (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Property and equipment, net:    
Property and equipment, net $ 47,292 $ 52,255
U.S.    
Property and equipment, net:    
Property and equipment, net 25,603 38,609
Europe, Belgium    
Property and equipment, net:    
Property and equipment, net 10,045 6,014
Europe, Other    
Property and equipment, net:    
Property and equipment, net 5,728 5,500
Europe    
Property and equipment, net:    
Property and equipment, net 15,773 11,514
Asia-Pacific    
Property and equipment, net:    
Property and equipment, net 5,671 1,930
Other    
Property and equipment, net:    
Property and equipment, net $ 245 $ 202