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Schedule of Purchase Price Allocation to Net Tangible and Intangible Assets Based on their Estimated Fair Values (Detail) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Jul. 04, 2014
Dec. 31, 2013
Business Acquisition [Line Items]        
Goodwill $ 46,612 $ 46,612   $ 36,498
RivieraWaves        
Business Acquisition [Line Items]        
Cash and cash equivalents     $ 1,189  
Bank deposits     1,384  
Other assets     2,898  
Intangible assets     6,161  
Goodwill     10,114  
Total assets     21,746  
Current liabilities     (2,201)  
Deferred tax liabilities, net     (1,433)  
Total liabilities     (3,634)  
Total     $ 18,112