Cash Equivalents and Marketable Securities - Schedule of Gross Unrealized Losses and Fair Value by Investment Category and Age (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
U.S. treasury securities
Schedule Of Available For Sale Securities [Line Items]
Less than 12 Months, Fair Value	$ 8,583
Less than 12 Months, Unrealized Loss	(1)
Total, Fair Value	8,583
Total, Unrealized Loss	$ (1)
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)