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Business Combinations - Preliminary and 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 12 Months Ended
Nov. 30, 2018
Mar. 19, 2018
Mar. 31, 2018
Dec. 31, 2018
Dec. 31, 2016
Dec. 31, 2017
Assets            
Goodwill       $ 7,106   $ 3,492
Liabilities            
Gain on bargain purchase of a business, net of tax       $ (11,322) $ (3,542)  
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        
SmartRG Inc [Member]            
Assets            
Tangible assets acquired $ 8,594          
Intangible assets 9,960          
Goodwill 3,614          
Total assets acquired 22,168          
Liabilities            
Liabilities assumed (6,126)          
Total liabilities assumed (6,126)          
Total net assets 16,042          
Total purchase price $ 16,042