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Business Combinations - Preliminary Allocation of the Purchase Price to the Estimated Fair Value of the Assets Acquired and Liabilities Assumed(Detail) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Mar. 19, 2018
Mar. 31, 2018
Jun. 30, 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