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Balance Sheet Details - Summary of Short -Term Investments (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Schedule Of Available For Sale Securities [Line Items]
Available-for-sale securities, amortized cost	$ 318,989	$ 300,622
Available-for-sale securities, gross unrealized gains	85	5
Available-for-sale securities, gross unrealized losses		(92)
Available-for-sale securities	319,074	300,535
U.S. Treasury Bills and Government Agency Obligations
Schedule Of Available For Sale Securities [Line Items]
Available-for-sale securities, amortized cost	140,567	59,747
Available-for-sale securities, gross unrealized gains	59
Available-for-sale securities, gross unrealized losses		(6)
Available-for-sale securities	140,626	59,741
U.S. Corporate Debt Securities
Schedule Of Available For Sale Securities [Line Items]
Available-for-sale securities, amortized cost	80,159	59,164
Available-for-sale securities, gross unrealized gains	11
Available-for-sale securities, gross unrealized losses		(77)
Available-for-sale securities	80,170	59,087
Foreign Corporate Debt Securities
Schedule Of Available For Sale Securities [Line Items]
Available-for-sale securities, amortized cost	23,188	5,041
Available-for-sale securities, gross unrealized gains	15	5
Available-for-sale securities	23,203	5,046
U.S. Commercial Paper
Schedule Of Available For Sale Securities [Line Items]
Available-for-sale securities, amortized cost	32,801	52,800
Available-for-sale securities	32,801	52,800
Foreign Commercial Paper
Schedule Of Available For Sale Securities [Line Items]
Available-for-sale securities, amortized cost	42,274	123,870
Available-for-sale securities, gross unrealized losses		(9)
Available-for-sale securities	$ 42,274	$ 123,861

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Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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