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Liability Related to the Sale of Future Royalties and Milestones (Narrative) (Details) - USD ($) |  | 1 Months Ended | 3 Months Ended |
--- | --- | --- | --- | ---
Jan. 19, 2018 | May 31, 2024 | Mar. 31, 2025 | Dec. 31, 2024
Liability Related To Sale Of Future Royalties And Milestones [Line Items] |  |  |  |
Non-cash royalty revenue recognized |  |  | $ 23,556,000 |
Non-cash interest expense |  |  | 12,049,000 |
Fair value of the Purchaser Upsize Option |  |  | 69,000 | $ 69,000
HCR [Member] | GSK Agreements [Member] | Royalty Purchase Agreement [Member] |  |  |  |
Liability Related To Sale Of Future Royalties And Milestones [Line Items] |  |  |  |
Percentage of purchase of worldwide rights to receive royalties | 100.00% |  |  |
Gross proceeds received for royalty rights | $ 190,000,000 |  |  |
Non-cash royalty revenue recognized |  |  | 23,600,000 |
Non-cash interest expense |  |  | $ 7,500,000 |
Effective annual interest rate |  |  | 12.10% |
Prospective effective annual interest rate |  |  | 23.80% |
Ligand Pharmaceuticals Incorporated [Member] | Common Stock [Member] |  |  |  |
Liability Related To Sale Of Future Royalties And Milestones [Line Items] |  |  |  |
Warrants issued to purchase shars of common stock |  | 867,052 |  |
Warrants, exercise price |  | $ 17.3 |  |
Ligand Pharmaceuticals Incorporated [Member] | Purchase Agreement [Member] |  |  |  |
Liability Related To Sale Of Future Royalties And Milestones [Line Items] |  |  |  |
Non-cash interest expense |  |  | $ 4,500,000 |
Effective annual interest rate |  |  | 24.30% |
Liability related to sale of future royalties and milestones |  |  | $ 63,879,000 |
Percentage of synthetic royalty on worldwide net sales of purchased assets |  | 2.625% |  |
Percentage reduction in amounts payable upon overall payments due exceeding specified return hurdle |  | 50.00% |  |
Percentage increase in synthetic royalty based on certain future events |  | 1.00% |  |
Consideration on sale of purchased assets gross |  | $ 75,000,000 |  |
Reimbursable expenses |  | 900,000 |  |
Time-based option to invest, additional amount |  | $ 25,000,000 |  |
Gross proceeds from purchase agreement |  |  | 75,000,000 |
Fair value of the Purchaser Upsize Option |  |  | $ 69,000 |
Ligand Pharmaceuticals Incorporated [Member] | Covered License Agreements [Member] | Purchase Agreement [Member] |  |  |  |
Liability Related To Sale Of Future Royalties And Milestones [Line Items] |  |  |  |
Percentage of sale of development, regulatory and commercial milestone payments eligible to receive |  | 31.875% |  |
Percentage of royalties receipts |  | 18.75% |  |

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