Cash Equivalents And Marketable Securities - Summary of Marketable Securities (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Schedule Of Available For Sale Securities [Line Items]
Cash equivalents, Amortized Cost	$ 65,473	$ 57,052
Cash equivalents, Fair Value	65,473	57,052
Marketable securities, Amortized Cost	174,959	55,864
Marketable securities, Gross Unrealized Gains	3	2
Marketable securities, Gross Unrealized Losses	(90)	(4)
Marketable securities, Fair Value	174,872	55,862
Total cash equivalents and marketable securities, Amortized Cost	240,432	112,916
Total cash equivalents and marketable securities, Gross Unrealized Gains	3	2
Total cash equivalents and marketable securities, Gross Unrealized Losses	(90)	(4)
Total cash equivalents and marketable securities, Fair Value	240,345	112,914
Money Market Funds
Schedule Of Available For Sale Securities [Line Items]
Cash equivalents, Amortized Cost	60,070	57,052
Cash equivalents, Fair Value	60,070	57,052
Commercial Paper
Schedule Of Available For Sale Securities [Line Items]
Cash equivalents, Amortized Cost	4,400
Cash equivalents, Fair Value	4,400
Marketable securities, Amortized Cost	86,941	32,523
Marketable securities, Gross Unrealized Gains	1
Marketable securities, Gross Unrealized Losses	(21)
Marketable securities, Fair Value	86,921	32,523
Corporate Bonds
Schedule Of Available For Sale Securities [Line Items]
Cash equivalents, Amortized Cost	1,003
Cash equivalents, Fair Value	1,003
Marketable securities, Amortized Cost	88,018	23,341
Marketable securities, Gross Unrealized Gains	2	2
Marketable securities, Gross Unrealized Losses	(69)	(4)
Marketable securities, Fair Value	$ 87,951	$ 23,339