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Royalty Financing Obligation - Activity (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended 12 Months Ended
Aug. 31, 2024
Aug. 01, 2023
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Dec. 31, 2023
Debt Instrument, Increase (Decrease), Net [Roll Forward]              
Receipt of the first tranche of the royalty financing obligation         $ 0 $ 30,000  
Accretion of imputed interest expense on royalty financing obligation     $ 2,820 $ 1,978 8,128 7,532  
Less: one-time payment for expiration of second tranche $ (2)       (2,000)   $ 0
Royalty Financing              
Debt Instrument, Increase (Decrease), Net [Roll Forward]              
Royalty financing obligation – beginning balance         33,490 0 0
Receipt of the first tranche of the royalty financing obligation   $ 30,000     0   30,000
Accretion of imputed interest expense on royalty financing obligation     2,820 $ 1,404 8,128 $ 1,404 3,743
Less: royalty payments made to RTW         (3,305)   (253)
Royalty financing obligation – ending balance     36,313   36,313   33,490
Less: royalty payable to RTW classified within accrued expenses     (1,876)   (1,876)   (730)
Royalty financing obligation, non-current     $ 34,437   $ 34,437   $ 32,760