Cash Equivalents and Marketable Securities - Schedule of Gross Unrealized Losses and Fair Value by Investment Category and Age (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
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)
Corporate bonds
Schedule Of Available For Sale Securities [Line Items]
Less than 12 Months, Fair Value		$ 13,022
Less than 12 Months, Unrealized Loss		(9)
Total, Fair Value		13,022
Total, Unrealized Loss		$ (9)
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)