Cash Equivalents and Marketable Securities - Schedule of Gross Unrealized Losses and Fair Value by Investment Category and Age (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Schedule Of Available For Sale Securities [Line Items]
Less than 12 Months, Fair Value		$ 110,076
Less than 12 Months, Unrealized Loss		(10)
Total, Fair Value		110,076
Total, Unrealized Loss		(10)
U.S. treasury securities
Schedule Of Available For Sale Securities [Line Items]
Less than 12 Months, Fair Value		43,183
Less than 12 Months, Unrealized Loss		(8)
Total, Fair Value		43,183
Total, Unrealized Loss		(8)
U.S. government agency securities
Schedule Of Available For Sale Securities [Line Items]
Less than 12 Months, Fair Value		66,893
Less than 12 Months, Unrealized Loss		(2)
Total, Fair Value		66,893
Total, Unrealized Loss		$ (2)
U.S. treasury securities
Schedule Of Available For Sale Securities [Line Items]
Less than 12 Months, Fair Value	$ 4,031
Less than 12 Months, Unrealized Loss	(1)
Total, Fair Value	4,031
Total, Unrealized Loss	$ (1)