Leases - Additional Information (Details)							12 Months Ended
	Dec. 15, 2020 USD ($)	Sep. 01, 2020 USD ($)	Jun. 01, 2020 USD ($)	Apr. 13, 2020 USD ($)	Oct. 15, 2019 USD ($) ft²	Mar. 12, 2019 USD ($) ft²	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Jan. 01, 2019 USD ($)	Jan. 30, 2018 USD ($) ft²
Land Subject to Ground Leases | ft²						1,038
Operating Lease Monthly Rental Payment			$ 10,000			$ 2,000
Operating Lease, Payments							$ 1,000,000.0
Operating Lease, Right-of-Use Asset							4,650,000	$ 2,272,000
Operating Lease, Liability							4,814,000
Recognisition in exchange of Operating Lease Liabilities							3,200,000
Adjustments for New Accounting Pronouncement [Member]
Operating Lease, Right-of-Use Asset									$ 1,600,000
Operating Lease, Liability									$ 1,600,000
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					210
Operating Leases Future Minimum Monthly Payment Due Through Year 2021	$ 37,000			$ 12,000	$ 17,000.0					$ 1,000
Annual Base Rent	3.00%			3.00%	3.00%
Lessee Operating Lease Monthly Rental Payment		$ 15,000