Short-term Investments - Summary of Amortized Cost, Gross Unrealized Gains and Losses, and Fair Value of Short-term Investments (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 85,265	$ 9,253
Gross Unrealized Gains	93	7
Gross Unrealized Losses	0	0
Aggregate Fair Value	85,358	9,260
U.S. government debt securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	85,001	8,989
Gross Unrealized Gains	93	7
Gross Unrealized Losses	0	0
Aggregate Fair Value	85,094	8,996
Certificates of deposit
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	264	264
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Aggregate Fair Value	$ 264	$ 264

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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Amount, before tax, of unrealized loss 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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Amortized cost of 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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Amount of 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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