Organization and Significant Accounting Policies (Tables)

9 Months Ended

Jun. 30, 2025

Accounting Policies [Abstract]

Schedule of Company's Current Pipeline

The following table presents the Company’s current pipeline:

Therapeutic Area	Name	Stage	Product Rights
Cardiometabolic	plozasiran	Phase 3	Arrowhead
	zodasiran	Phase 3	Arrowhead
	olpasiran	Phase 3	Amgen
	ARO-PNPLA3	Phase 1	Arrowhead
	GSK-4532990	Phase 2b	GSK
	ARO-INHBE	Phase 1/2a	Arrowhead
	ARO-ALK7	Phase 1/2a	Arrowhead
Pulmonary	ARO-RAGE	Phase 1/2a	Arrowhead
	SRP-1002 (ARO-MMP7)	Phase 1/2a	Sarepta
Liver	fazirsiran	Phase 3	Takeda and Arrowhead
	GSK5637608	Phase 2	GSK
Neuromuscular	SRP-1001 (ARO-DUX4)	Phase 1/2a	Sarepta
	SRP-1003 (ARO-DM1)	Phase 1/2a	Sarepta
Central Nervous System (CNS)	SRP-1004 (ARO-ATXN2)	Phase 1/2a	Sarepta
Other	ARO-C3	Phase 1/2a	Arrowhead
	ARO-CFB	Phase 1/2a	Arrowhead