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Information by Geographic Area (Detail) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Revenues from External Customers and Long-Lived Assets [Line Items]          
Long-lived Assets $ 24,706   $ 24,706   $ 23,227
Net Sales 105,781 $ 119,565 198,785 $ 214,070  
China          
Revenues from External Customers and Long-Lived Assets [Line Items]          
Long-lived Assets 19,157   19,157   17,194
United States          
Revenues from External Customers and Long-Lived Assets [Line Items]          
Long-lived Assets 5,366   5,366   5,755
Net Sales 79,673 99,070 151,046 168,630  
Hong Kong          
Revenues from External Customers and Long-Lived Assets [Line Items]          
Long-lived Assets 183   183   $ 278
Net Sales 300 168 527 387  
Europe          
Revenues from External Customers and Long-Lived Assets [Line Items]          
Net Sales 15,307 10,337 23,936 22,897  
Canada          
Revenues from External Customers and Long-Lived Assets [Line Items]          
Net Sales 3,811 2,580 7,572 7,024  
Other          
Revenues from External Customers and Long-Lived Assets [Line Items]          
Net Sales $ 6,690 $ 7,410 $ 15,704 $ 15,132