Leases - Additional Information (Details)		3 Months Ended
	Mar. 12, 2019 USD ($) ft²	Sep. 30, 2020	Mar. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Oct. 15, 2019 USD ($) ft²	Jan. 30, 2018 USD ($) ft²
Land Subject to Ground Leases | ft²	1,038
Lessee Operating Lease Monthly Average Rental Payment | $	$ 2,000.0
Boston, MA
Security Deposit | $			$ 100,000	$ 100,000
Sublease term amendment			Aug. 31, 2021
Operating lease expiration month and year			2016-08
Houston, TX
Land Subject to Ground Leases | ft²					8,443
Operating Lease Area | ft²						210
Operating Leases Future Minimum Monthly Payment Due Through Year 2021 | $					$ 17,000.0	$ 1,000
Annual Base Rent		3.00%