Significant Accounting Policies - Summary of Grant Income in the Accompanying Statements of Operations (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Jun. 30, 2021	Jun. 30, 2021	Jun. 30, 2020
Basis Of Presentation And Significant Accounting Policies [Line Items]
Grant income	$ 2,589	$ 4,420	$ 22
Alzheimer's Association Part the Cloud Research Grant
Basis Of Presentation And Significant Accounting Policies [Line Items]
Grant income			$ 22
National Institutes of Health Grant
Basis Of Presentation And Significant Accounting Policies [Line Items]
Grant income	$ 2,589	$ 4,420