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Balance Sheet Components - Summary of Contractual Maturities Available-for-Sale Investments at Fair Value(Detail) - USD ($) $ in Thousands | Dec. 31, 2015 | Dec. 31, 2014
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Investments Schedule [Abstract] |  |
Within one year | $ 12,797 |
After one year through four years | 121,521 |
Total debt investments | 134,318 |
Bond and mutual funds | 25,052 |
Equity investments | 197 |
Total investments | $ 159,567 | $ 158,633

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