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Prepaid and Other Current Assets | 3 Months Ended
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Mar. 31, 2024
Prepaid Expense and Other Assets, Current [Abstract] |
Prepaid and Other Current Assets | 5. Prepaid and Other Current Assets Prepaid and other current assets consisted of the following as of March 31, 2024 and December 31, 2023 (in thousands):
|  | March 31, |  |  | December 31, |
|  | 2024 |  |  | 2023 |
Down payments for inventory |  |  | 13,828 |  |  |  | 16,296 |
Prepaid research and development |  |  | 12,626 |  |  |  | 13,931 |
Other prepaid expenses |  |  | 16,709 |  |  |  | 8,593 |
Total prepaid expenses |  | $ | 43,163 |  |  | $ | 38,820 |
|  | March 31, |  |  | December 31, |
|  | 2024 |  |  | 2023 |
Royalties receivable |  | $ | 4,499 |  |  | $ | 3,054 |
Receivable from collaboration agreement(1) |  |  | — |  |  |  | 15,000 |
Deposits and other current assets |  |  | 7,620 |  |  |  | 4,354 |
Total other current assets |  | $ | 12,119 |  |  | $ | 22,408 |
(1) In January 2024 the Company waived the remaining reimbursement payment of $15.0 million from Sobi in connection with the decision to discontinue the cold agglutinin disease (CAD) program.

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