Revenue - Additional Information (Details) - USD ($) $ in Thousands	1 Months Ended	3 Months Ended			9 Months Ended
	Feb. 28, 2018	Sep. 30, 2021	Sep. 30, 2020	Mar. 31, 2020	Sep. 30, 2021	Sep. 30, 2020
Disaggregation of Revenue [Line Items]
Revenue		$ 335	$ 0		$ 10,673	$ 320
Sublicense revenue
Disaggregation of Revenue [Line Items]
Revenue		335	0		10,673	0
SBIR Grants
Disaggregation of Revenue [Line Items]
Revenue		$ 0	$ 0		$ 0	$ 300
Grants from the National Institutes of Health	$ 2,800			$ 2,800