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Balance Sheet Components - Summary of Contractual Maturities Available-for-Sale Investments and Term Deposit (Detail) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Available For Sale Securities Debt Maturities [Abstract]
Within one year	$ 407,491
After one year through four years	50,047
Total debt investments	457,538
Bond and mutual funds	10,816
Equity investments	255
Total investments	$ 468,609	$ 587,964

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

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Fair value of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), maturing in next fiscal year following latest fiscal year. Excludes interim and annual periods when interim period is reported on rolling approach, from latest statement of financial position date.

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