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 |