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Balance Sheet Components - Summary of Contractual Maturities Available-for-Sale Investments at Fair Value(Detail) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Investments Schedule [Abstract]
Within one year	$ 53,943
After one year through four years	0
Total debt investments	53,943
Bond and mutual funds	18,402
Equity investments	221
Total investments	$ 72,566	$ 150,407

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Available for sale securities bond and mutual funds.

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Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

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-Publisher FASB
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