Short-Term Investments - Summary of Short-Term Investments (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost	$ 44,697	$ 71,782
Unrealized Gains	5	5
Unrealized Losses	(3)	(4)
Estimated Fair Value	44,699	71,783
Commercial Paper
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost	27,985	27,136
Unrealized Gains	3
Unrealized Losses	(1)
Estimated Fair Value	27,987	27,136
Corporate Debt Securities
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost	1,405	26,510
Unrealized Losses	(1)	(4)
Estimated Fair Value	1,404	26,506
U.S. Government and Agency Securities
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost	15,307	18,136
Unrealized Gains	2	5
Unrealized Losses	(1)
Estimated Fair Value	$ 15,308	$ 18,141

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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