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Net Sales and Long-Lived Assets by Major Geographic Locations (Detail) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Revenues from External Customers and Long-Lived Assets [Line Items]    
Long-lived assets $ 50,188 $ 48,793
United States    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Long-lived assets 47,812 45,285
United Kingdom    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Long-lived assets 1,896 2,779
Rest of World    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Long-lived assets $ 480 $ 729