Cash Equivalents and Marketable Securities - Schedule of Gross Unrealized Losses and Fair Value by Investment Category and Age (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Schedule Of Available For Sale Securities [Line Items]
Less than 12 Months, Fair Value	$ 29,988
Less than 12 Months, Unrealized Loss	(5)
Total, Fair Value	29,988
Total, Unrealized Loss	(5)
U.S. treasury securities
Schedule Of Available For Sale Securities [Line Items]
Less than 12 Months, Fair Value	24,987
Less than 12 Months, Unrealized Loss	(4)
Total, Fair Value	24,987
Total, Unrealized Loss	(4)
Corporate bonds
Schedule Of Available For Sale Securities [Line Items]
Less than 12 Months, Fair Value	5,001	$ 13,022
Less than 12 Months, Unrealized Loss	(1)	(9)
Total, Fair Value	5,001	13,022
Total, Unrealized Loss	$ (1)	$ (9)