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Balance Sheet Details - Summary of Short -Term Investments (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Schedule Of Available For Sale Securities [Line Items]
Available-for-sale securities, amortized cost	$ 103,096	$ 318,989
Available-for-sale securities, gross unrealized gains	257	85
Available-for-sale securities	103,353	319,074
U.S. Treasury Bills and Government Agency Obligations
Schedule Of Available For Sale Securities [Line Items]
Available-for-sale securities, amortized cost	20,110	140,567
Available-for-sale securities, gross unrealized gains	166	59
Available-for-sale securities	20,276	140,626
U.S. Corporate Debt Securities
Schedule Of Available For Sale Securities [Line Items]
Available-for-sale securities, amortized cost	11,505	80,159
Available-for-sale securities, gross unrealized gains	42	11
Available-for-sale securities	11,547	80,170
Foreign Corporate Debt Securities
Schedule Of Available For Sale Securities [Line Items]
Available-for-sale securities, amortized cost	15,508	23,188
Available-for-sale securities, gross unrealized gains	49	15
Available-for-sale securities	15,557	23,203
U.S. Commercial Paper
Schedule Of Available For Sale Securities [Line Items]
Available-for-sale securities, amortized cost	13,997	32,801
Available-for-sale securities	13,997	32,801
Foreign Commercial Paper
Schedule Of Available For Sale Securities [Line Items]
Available-for-sale securities, amortized cost	41,976	42,274
Available-for-sale securities	$ 41,976	$ 42,274

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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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