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Short-term Investments - Summary of Short-term Investments (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Schedule Of Available For Sale Securities [Line Items]
Available-for-sale securities, amortized cost	$ 162,465	$ 318,989
Available-for-sale securities, gross unrealized gains	540	85
Available-for-sale securities	163,005	319,074
U.S. Treasury Bills and Government Agency Obligations
Schedule Of Available For Sale Securities [Line Items]
Available-for-sale securities, amortized cost	70,175	140,567
Available-for-sale securities, gross unrealized gains	316	59
Available-for-sale securities	70,491	140,626
U.S. Corporate Debt Securities
Schedule Of Available For Sale Securities [Line Items]
Available-for-sale securities, amortized cost	25,624	80,159
Available-for-sale securities, gross unrealized gains	110	11
Available-for-sale securities	25,734	80,170
Foreign Corporate Debt Securities
Schedule Of Available For Sale Securities [Line Items]
Available-for-sale securities, amortized cost	23,534	23,188
Available-for-sale securities, gross unrealized gains	114	15
Available-for-sale securities	23,648	23,203
U.S. Commercial Paper
Schedule Of Available For Sale Securities [Line Items]
Available-for-sale securities, amortized cost	14,995	32,801
Available-for-sale securities	14,995	32,801
Foreign Commercial Paper
Schedule Of Available For Sale Securities [Line Items]
Available-for-sale securities, amortized cost	28,137	42,274
Available-for-sale securities	$ 28,137	$ 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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