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Royalty Financing Obligation (Tables)
 9 Months Ended
Sep. 30, 2023
Debt Disclosure [Abstract]  
Schedule of Royalty Financing Obligation
Long-term debt is summarized as follows:
Exchangeable Senior Notes:September 30, 2023December 31, 2022
Principal amount of 4.50% exchangeable senior notes due October 2023
$21,187 $117,375 
Principal amount of 4.50% exchangeable senior notes due February 2023
— 17,500 
Less: unamortized debt discount and issuance costs, net — (5,593)
Net carrying amount of debt21,187 129,282 
Less: current maturities, net of $0 and $1,019 unamortized debt discount and issuance costs, respectively
(21,187)(37,668)
     Long-term debt$— $91,614 
The following table shows the activity within the royalty financing obligation account for the period ended September 30, 2023.

Royalty Financing Obligation:September 30, 2023
Royalty financing obligation – beginning balance$— 
Receipt of the first tranche of the royalty financing obligation30,000 
Accretion of imputed interest expense on royalty financing obligation1,404 
Royalty financing obligation – ending balance31,404 
Less: royalty payable to RTW classified within accrued expenses253 
Royalty financing obligation, non-current$31,151