Commitments and Contingencies - Additional Information (Details)	3 Months Ended			6 Months Ended		12 Months Ended
	Jun. 30, 2024 USD ($) m² ft²	Mar. 31, 2024	Jun. 30, 2023 USD ($)	Jun. 30, 2024 USD ($) m² ft²	Jun. 30, 2023 USD ($)	Dec. 31, 2023 USD ($)	May 31, 2023 USD ($) m²	Nov. 30, 2021 USD ($)
Other Commitments [Line Items]
Land subject to leases | m²	1,577			1,577
Right of use assets	$ 5,500,000			$ 5,500,000		$ 6,036,000
Liability	5,516,000			5,516,000
Operating leases, rent expense	400,000		$ 300,000	$ 800,000	$ 600,000
Extension of office lease				In January 2021, the Company entered into an amendment to extend the lease, effective February 2021 with a termination date of January 2030, and increase the office and laboratory space
Wu Xi Agreement
Other Commitments [Line Items]
Minimum commitments	0			$ 0		0
Payments for Royalties				0		0
Gosselies, Belgium
Other Commitments [Line Items]
Operating lease, Hand serving to secure lease obligation	$ 160,000			$ 160,000		131,000
Watertown Massachusetts [Member]
Other Commitments [Line Items]
Land subject to leases | ft²	9,068			9,068
Operating lease, Letter of credit to secure lease obligation								$ 142,000
Office and Laboratory Space | Gosselies, Belgium
Other Commitments [Line Items]
Lease commencement date				May 31, 2016
Lease expiration date				Dec. 31, 2021
Lessee, operating lease, existence of option to extend [true false]		false
Lessee, operating lease, existence of option to terminate [true false]		false
Office and Laboratory Space | Gosselies, Belgium | AmendmentToExtendLeaseMember
Other Commitments [Line Items]
Increase land subject to leases | m²	201			201			453
Area of lease land | m²							2,684
Right of use assets							$ 900,000
Liability							$ 900,000
Office and Laboratory Space | Gosselies, Belgium | Agreement To Extend Lease Member
Other Commitments [Line Items]
Lease commencement date				Feb. 28, 2021
Lease expiration date				Jan. 31, 2030
Increase land subject to leases | ft²	453			453
Office | Cambridge, Massachusetts
Other Commitments [Line Items]
Lease expiration date				Feb. 28, 2027
Office | Watertown Massachusetts [Member]
Other Commitments [Line Items]
Lease commencement date				Nov. 30, 2021
Laboratory space | Gosselies, Belgium
Other Commitments [Line Items]
Land subject to leases | m²	859			859
Contract Termination
Other Commitments [Line Items]
Restructuring charges				$ 0		$ 0
Minimum
Other Commitments [Line Items]
Contractual Agreement Cancelation Notice period				30 days
Average car lease duration	48 months			48 months
Maximum
Other Commitments [Line Items]
Contractual Agreement Cancelation Notice period				60 days
Average car lease duration	60 months			60 months