Leases - Additional Information (Details) - Watertown Lease - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Dec. 31, 2020
Lessee Lease Description [Line Items]
Lessee operating lease, description	In July 2017, the Company entered into a lease of office and laboratory space for its headquarters at 490 Arsenal Way, Suite 200 in Watertown, Massachusetts (the “Watertown Lease”). The Watertown Lease commenced in April 2018 with rent commencing in May 2018.
Lease commencement date	2018-04
Rent commencing date	2018-05
Lease non-cancelable term	10 years
Restricted Cash
Lessee Lease Description [Line Items]
Lease collateral amount	$ 2.6	$ 2.6