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Long-Lived Assets by Geographic Location (Detail) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Segment Reporting Information [Line Items]    
Property and equipment, net $ 2,669 $ 2,624
Operating lease ROU assets 5,970  
Americas    
Segment Reporting Information [Line Items]    
Property and equipment, net 1,178 1,060
Operating lease ROU assets 5,177  
Europe and the Middle East    
Segment Reporting Information [Line Items]    
Property and equipment, net 35 43
Operating lease ROU assets 130  
Asia-Pacific    
Segment Reporting Information [Line Items]    
Property and equipment, net 1,456 $ 1,521
Operating lease ROU assets $ 663