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Balance Sheet Components - Summary of Contractual Maturities Available-for-Sale Investments at Fair Value(Detail) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Investments Schedule [Abstract]
Within one year	$ 67,075
After one year through four years	60,645
Total debt investments	127,720
Bond and mutual funds	22,462
Equity investments	225
Total investments	$ 150,407	$ 159,567

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Available for sale securities bond and mutual funds.

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Available for sale securities debt maturities after one through four years fair value.

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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
-Name Accounting Standards Codification
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Fair value of available-for-sale debt securities maturing in the next fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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