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Liability Related to the Revenue Participation Right
 6 Months Ended
Jun. 30, 2026
Commitments and Contingencies Disclosure [Abstract]  
Liability Related to the Revenue Participation Right Liability Related to the Revenue Participation Right
In December 2025, the Company entered into a synthetic royalty funding agreement (the “Royalty Agreement”) with Royalty Pharma. Pursuant to the Royalty Agreement, Royalty Pharma agreed to provide up to $275.0 million in funding to the Company in exchange for a 9.25% royalty on worldwide net sales of AVLAYAH ("Revenue Participation Right").
The Company received $200.0 million in gross proceeds in March 2026 triggered by the U.S. Food and Drug Administration’s accelerated approval of AVLAYAH. The Company is entitled to receive an additional $75.0 million upon approval of AVLAYAH by the European Medicines Agency ("EMA") on or before December 31, 2029. The Company retains all worldwide development and commercialization rights to AVLAYAH.
The royalty obligation to Royalty Pharma will cease upon cumulative royalty payments reaching a cap of 3.0 times the total funding received, or 2.5 times the funding received if such cap is reached in respect of sales that occur on or before the end of the first quarter of 2039.
The $200.0 million, net of transaction costs of approximately $0.4 million, is recorded as a non-current liability on the Company's Condensed Consolidated Balance Sheet as of June 30, 2026 based on the estimated timing of future royalty payments. The royalty payments to Royalty Pharma will be recorded as a reduction of the liability. The additional $75.0 million contingent upon EMA approval of AVLAYAH has not been recognized as a liability as of June 30, 2026, as the receipt is contingent upon a future regulatory event. Upon receipt, the additional proceeds will be recorded as an increase to the liability, net of any incremental transaction costs, and the effective interest rate will be adjusted prospectively.
As of June 30, 2026, the Company's estimate of total future royalty payments resulted in an effective annual interest rate of approximately 12% and recorded $5.9 million of non-cash interest expense during the three months ended June 30, 2026. No payments were made during the three and six months ended June 30, 2026.
As of June 30, 2026, the carrying value of the liability approximates its estimated fair value. The Company’s projections of future royalty payments are subject to estimation uncertainty and are based on various assumptions underlying projected net product sales over the term of the agreement. These inputs are considered to be Level 3 inputs in the fair value hierarchy, as they involve unobservable inputs and judgment. Changes in these assumptions could have a material impact on the effective interest rate.