Quarterly report [Sections 13 or 15(d)]

Leases (Additional Information) (Details)

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Leases (Additional Information) (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2025
Dec. 31, 2024
Mar. 31, 2024
Lessee, Lease, Description [Line Items]      
ROU asset $ 5,434 $ 6,315  
Additional in fixed undiscounted lease payments $ 459    
Weighted average discount rate - operating leases 11.00%   10.50%
Wuxi Agreement Member      
Lessee, Lease, Description [Line Items]      
Work orders terms The terms of the August 2023 work orders included both fixed costs and contingent variable costs. The lease commenced October 1, 2023. In 2024, the Company remeasured the lease following the resolution of the contingency related to variable costs and an amendment to the 2023 work order, which extended the term of the agreement by an additional 18 months through August 2026. The Company may terminate the Dedicated Suite lease for convenience with six months’ prior written notice and up to a $1,080 termination fee if both the rese-cel and MuSK-CAART work orders are terminated.    
Termination fees $ 1,080    
Increase in the lease liability   $ 14,930