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Prepaid and Other Current Assets - Summary of Prepaid and Other Current Assets (Detail) - USD ($)
$ in Thousands
Sep. 30, 2024
Dec. 31, 2023
Prepaid Expense and Other Assets, Current [Abstract]    
Down payments for inventory $ 8,251 $ 16,296
Prepaid research and development 6,582 13,931
Other prepaid expenses 8,976 8,593
Total prepaid assets 23,809 38,820
Royalties receivable 4,958 3,054
Receivable from collaboration agreement [1]   15,000
Deposits and other current assets 6,824 4,354
Total other current assets $ 11,782 $ 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.