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Short-term Investments - Summary of Short-term Investments (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Schedule Of Available For Sale Securities [Line Items]
Available-for-sale securities, amortized cost	$ 219,161	$ 318,989
Available-for-sale securities, gross unrealized gains	953	85
Available-for-sale securities	220,114	319,074
U.S. Treasury Bills and Government Agency Obligations
Schedule Of Available For Sale Securities [Line Items]
Available-for-sale securities, amortized cost	100,309	140,567
Available-for-sale securities, gross unrealized gains	560	59
Available-for-sale securities	100,869	140,626
U.S. Corporate Debt Securities
Schedule Of Available For Sale Securities [Line Items]
Available-for-sale securities, amortized cost	44,861	80,159
Available-for-sale securities, gross unrealized gains	231	11
Available-for-sale securities	45,092	80,170
Foreign Corporate Debt Securities
Schedule Of Available For Sale Securities [Line Items]
Available-for-sale securities, amortized cost	23,574	23,188
Available-for-sale securities, gross unrealized gains	162	15
Available-for-sale securities	23,736	23,203
U.S. Commercial Paper
Schedule Of Available For Sale Securities [Line Items]
Available-for-sale securities, amortized cost	18,968	32,801
Available-for-sale securities	18,968	32,801
Foreign Commercial Paper
Schedule Of Available For Sale Securities [Line Items]
Available-for-sale securities, amortized cost	31,449	42,274
Available-for-sale securities	$ 31,449	$ 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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