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Prepaid and Other Current Assets - Summary of Prepaid and Other Current Assets (Detail) - USD ($) $ in Thousands | Mar. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Prepaid Expense and Other Assets, Current [Abstract] |  |  |
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
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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