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Leases, Operating Lease Right-of-use Assets and Liabilities (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Operating Lease, Asset [Abstract]    
Operating lease ROU assets, Beginning $ 1,030  
Recognition of ROU asset for Somerville Sublease 34,410  
Adjustment to ROU asset for remeasurement of Somvervile Sublease liability (1,620)  
Amortization of operating lease ROU assets (1,039) $ (336)
Operating lease ROU assets, Ending 32,781 1,030
Operating Lease, Liability [Abstract]    
Operating lease liabilities, Beginning 1,182  
Recognition of lease liability for Somerville Sublease 34,169  
Accretion of interest for Somerville Sublease 1,858  
Adjustment to lease liability due to remeasurement of Somerville Sublease (1,620)  
Principal payments on operating lease liabilities (519)  
Operating lease liabilities, Ending 35,070 1,182
Less non-current portion 32,854 887
Current portion $ 2,216 $ 295