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Research and Development Funding Expense (Tables)
3 Months Ended
Mar. 31, 2026
Research and Development [Abstract]  
Schedule of Research and Development Funding Expense
Below summarizes our ongoing R&D funding arrangements as of March 31, 2026 (in thousands):

Product Candidates
CounterpartiesTotal Commitments
Funding Timing
Unfunded Commitments
JNJ‑4804
Johnson & Johnson$500,000 
Eight fixed quarterly payments commencing in the second quarter of 2026
$500,000 
TEV-’408(1)
Teva Pharmaceuticals
75,000 
Variable quarterly payments commencing in second quarter of 2026
75,000 
Litifilimab
Biogen250,000 
Six fixed quarterly payments commencing in first quarter of 2025
25,000 
Total$825,000 $600,000 
(1)In the first quarter of 2026, we entered into an R&D funding arrangement with Teva Pharmaceuticals, a U.S. affiliate of Teva Pharmaceutical Industries Ltd, for TEV-’408 for up to $500 million. Under the agreement, we agreed to co-fund a Phase 2b study for vitiligo for up to $75 million and have the option to provide up to an additional $425 million to co-fund the Phase 3 development program based on the results of the Phase 2b study. In the first quarter of 2026, we accrued $14.3 million of R&D funding expense for our portion of estimated costs incurred for the Phase 2b study, which is recorded within Other current liabilities on the condensed consolidated balance sheet and is expected to be paid in the second quarter of 2026.