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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

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