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Prepaid and Other Current Assets - Summary of Prepaid and Other Current Assets (Detail) - USD ($)
$ in Thousands
Jun. 30, 2024
Dec. 31, 2023
Prepaid Expense and Other Assets, Current [Abstract]    
Down payments for inventory $ 9,411 $ 16,296
Prepaid research and development 7,787 13,931
Other prepaid expenses 11,773 8,593
Total prepaid expenses 28,971 38,820
Royalties receivable 4,418 3,054
Receivable from collaboration agreement [1]   15,000
Deposits and other current assets 7,954 4,354
Total other current assets $ 12,372 $ 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.