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Balance Sheet Components - Summary of Contractual Maturities Available-for-Sale Investments and Term Deposit (Detail) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Investments Schedule [Abstract]
Within one year	$ 532,144
After one year through four years	45,102
Total debt investments	577,246
Bond and mutual funds	10,484
Equity investments	234
Total investments	$ 587,964	$ 72,566

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