Short-term and Long-term Investments - Summary of Amortized Cost, Gross Unrealized Gains and Losses, and Fair Value of Short-term and Long-term Investments (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 139,640	$ 48,312
Gross Unrealized Gains	5	14
Gross Unrealized Losses	(35)	(1)
Aggregate Fair Value	139,610	48,325
U.S. government debt securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	139,375	48,048
Gross Unrealized Gains	5	14
Gross Unrealized Losses	(35)	(1)
Aggregate Fair Value	139,345	48,061
Certificates of deposit
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	265	264
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Aggregate Fair Value	$ 265	$ 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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