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Business Combinations - Preliminary Allocation of the Purchase Price to the Estimated Fair Value of the Assets Acquired (Detail) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 19, 2018
Mar. 31, 2018
Liabilities    
Gain on bargain purchase of a business, net of tax   $ (11,322)
Total purchase price   7,806
Sumitomo Electric Lightwave Corp.'s North American EPON Business [Member]    
Assets    
Other receivables $ 104  
Inventory 510  
Property, plant and equipment 392  
Intangible assets 22,100  
Total assets acquired 23,106  
Liabilities    
Deferred income taxes (3,978)  
Total liabilities assumed (3,978)  
Total net assets 19,128  
Gain on bargain purchase of a business, net of tax (11,322) $ (11,300)
Total purchase price $ 7,806