Significant Accounting Policies - Summary of Grant Income in the Accompanying Statements of Operations (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Basis Of Presentation And Significant Accounting Policies [Line Items]
Grant income	$ 1,831	$ 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	$ 1,831