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Commitments and Contingencies (Details) - USD ($) $ in Thousands		1 Months Ended		3 Months Ended	6 Months Ended
	Oct. 05, 2020	Nov. 30, 2019	Feb. 28, 2018	Jun. 30, 2023	Jun. 30, 2023	Mar. 31, 2015
Leased assets
Sublease income				$ 800	$ 1,500
Lease Cost:
Operating lease cost				2,169	4,337
Variable lease cost				669	1,159
Total lease cost				$ 2,838	5,496
Operating cash flows used for operating leases					$ 4,823
Weighted average remaining lease term				2 years 1 month 6 days	2 years 1 month 6 days
Weighted average incremental borrowing rate				7.60%	7.60%
620 Memorial Drive, Cambridge MA
Leased assets
Term of lease						5 years
Option to extend the term			true
Sublease annual base rent	$ 1,900
620 Memorial Drive, Cambridge MA | Minimum
Leased assets
Rent for facility lease			$ 1,400
620 Memorial Drive, Cambridge MA | Maximum
Leased assets
Rent for facility lease			$ 1,700
301 Binney St, Cambridge MA
Leased assets
Option to extend the term		true
Renewal term		2 years
Base rent		$ 6,900
Annual upward adjustment (as a percent)		3.50%
Incentive to lease		$ 14,100
Letter of credit		$ 2,300

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