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Prepaid and Other Current Assets | 12 Months Ended
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Dec. 31, 2024
Prepaid Expense and Other Assets, Current [Abstract] |
Prepaid and Other Current Assets | 5. Prepaid and Other Current Assets Prepaid as sets and other current assets consisted of the following as of December 31, 2024, and 2023 (in thousands):
|  | December 31, |
|  | 2024 |  |  | 2023 |
Down payments for inventory |  | $ | 1,080 |  |  | $ | 16,296 |
Prepaid research and development |  |  | 7,780 |  |  |  | 13,931 |
Other prepaid assets |  |  | 9,508 |  |  |  | 8,593 |
Total prepaid assets |  | $ | 18,368 |  |  | $ | 38,820 |
|  | December 31, |
|  | 2024 |  |  | 2023 |
Royalties receivable |  | $ | 4,525 |  |  | $ | 3,054 |
Receivable from collaboration agreement (1) |  |  | 2,272 |  |  |  | 15,000 |
Deposits and other current assets |  |  | 4,847 |  |  |  | 4,354 |
Total other current assets |  | $ | 11,644 |  |  | $ | 22,408 |
(1) In January 2024 the Company waived the remaining reimbursement payment of $15.0 million in connection with the decision to discontinue the cold agglutinin disease (“CAD”) program. As the reimbursement was related to development costs under the Sobi collaboration agreement, this amount was recorded to research and development expense in the consolidated statements of operations for the period ended December 31, 2024.

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