Fair Value Measurements - Schedule of Assets Measured at Fair Value on Recurring Basis (Details) - Fair Value Measurements Recurring - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Assets, Fair Value	$ 278,141	$ 293,600
Money Market Funds
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Assets, Fair Value	104,208	78,446
U.S. Treasury Securities
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Assets, Fair Value	173,933	215,154
Level 1
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Assets, Fair Value	278,141	293,600
Level 1 | Money Market Funds
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Assets, Fair Value	104,208	78,446
Level 1 | U.S. Treasury Securities
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Assets, Fair Value	173,933	215,154
Fair Value
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Assets, Fair Value	278,141	293,600
Fair Value | Money Market Funds
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Assets, Fair Value	104,208	78,446
Fair Value | U.S. Treasury Securities
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Assets, Fair Value	$ 173,933	$ 215,154