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Business Combinations - Final Allocation of the Purchase Price to the Estimated Fair Value of the Assets Acquired and Liabilities Assumed (Detail) - USD ($)
$ in Thousands
 3 Months Ended
Nov. 30, 2018
Mar. 19, 2018
Mar. 31, 2018
Mar. 31, 2019
Dec. 31, 2018
Assets          
Goodwill       $ 6,982 $ 7,106
Liabilities          
Gain on bargain purchase of a business, net of tax     $ (11,322)    
SmartRG Inc [Member]          
Assets          
Tangible assets acquired $ 8,594        
Intangible assets 9,960        
Goodwill 3,489        
Total assets acquired 22,043        
Liabilities          
Liabilities assumed (6,001)        
Total liabilities assumed (6,001)        
Total net assets 16,042        
Total purchase price $ 16,042        
Sumitomo [Member]          
Assets          
Tangible assets acquired   $ 1,006      
Intangible assets   22,100      
Total assets acquired   23,106      
Liabilities          
Liabilities assumed   (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