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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, 2016
Dec. 31, 2015
Jul. 04, 2014
Business Acquisition [Line Items]      
Goodwill $ 46,612 $ 46,612  
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