Commitments and Contingencies - Additional Information (Details) - USD ($)	1 Months Ended		3 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Mar. 31, 2021	Mar. 31, 2020
Lessee Lease Description [Line Items]
Lease expense			$ 100,000	$ 700,000
Operating lease, cash payments			$ 50,000	$ 1,600,000
Operating lease weighted-average remaining lease term			2 years 7 months 6 days
Operating lease weighted-average discount rate			4.00%
Waltham Sublease
Lessee Lease Description [Line Items]
Expiration date	Nov. 30, 2023
Sublease rent per month	$ 15,000
San Diego Sublease
Lessee Lease Description [Line Items]
Sublease rent per month		$ 12,000
Sublease term		7 years
Sublease cancellable written notice period		30 days
Payments of sublease			$ 36,000,000