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AbbVie Collaboration - Additional Information (Detail) - AbbVie [Member]
$ in Thousands
6 Months Ended
Mar. 31, 2026
USD ($)
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]  
Cash consideration received under collaboration from milestone payments and royalties $ 1,365,000
Collaboration agreement tiered royalty description from ten percent up to twenty percent, or on a blended basis from ten percent up to the high teens, on the portion of AbbVie’s calendar year net sales