Leases - Summer Street Lease (Details) ft² in Thousands, $ in Thousands	1 Months Ended	3 Months Ended		9 Months Ended
	Jun. 30, 2019 ft²	Sep. 30, 2022 USD ($)	Sep. 30, 2021 USD ($)	Sep. 30, 2022 USD ($)	Sep. 30, 2021 USD ($)	Dec. 31, 2021 USD ($)
Operating leases
Weighted-average discount rate of operating leases (as a percent)		5.80%	5.80%	5.80%	5.80%
Operating lease right-of-use assets		$ 14,365		$ 14,365		$ 15,350
Operating lease liability		20,137		20,137
Operating lease cost		$ 627	$ 630	$ 1,883	$ 1,891
Summer Street Lease
Operating leases
Rentable area leased (in square feet) | ft²	39
Annual rent escalation (as a percent)	2.00%
Option to extend the term of the lease	true
Operating lease, renewal term	5 years
Weighted-average discount rate of operating leases (as a percent)		5.80%		5.80%
Operating lease right-of-use assets		$ 14,400		$ 14,400		15,300
Operating lease liability		20,100		20,100		$ 21,500
Operating lease cost		$ 600	$ 600	$ 1,900	$ 1,900