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Organization and Significant Accounting Policies (Tables)

12 Months Ended

Sep. 30, 2024

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 2b			Arrowhead
			olpasiran			Phase 3			Amgen
Pulmonary			ARO-RAGE			Phase 1/2a			Arrowhead
			ARO-MUC5AC			Phase 1/2a			Arrowhead
			ARO-MMP7			Phase 1/2a			Arrowhead
Liver			GSK-4532990			Phase 2b			GSK
			fazirsiran			Phase 3			Takeda and Arrowhead
			daplusiran/tomligisiran			Phase 2			GSK
			ARO-PNPLA3			Phase 1			Arrowhead
			ARO-C3			Phase 1/2a			Arrowhead
			ARO-CFB			Phase 1/2a			Arrowhead
			ARO-INHBE			Phase 1/2a			Arrowhead
Muscle			ARO-DUX4			Phase 1/2a			Arrowhead
			ARO-DM1			Phase 1/2a			Arrowhead
Central Nervous System (CNS)			ARO-ATXN2			Phase 1/2a			Arrowhead

Schedule of Useful Lives of Property Plant and Equipment

The estimated useful lives of property, plant and equipment are as follows (in years):

			Estimated Useful Lives
Building			39
Research equipment			5 to 10
Furniture			7
Computers and software			3 to 5
Leasehold improvements			3 to 15

The following table summarizes the Company’s major classes of property, plant and equipment:

			September 30,
			2024						2023
			(in thousands)
Land			$	2,996					$	2,996
Building			75,988						—
Research equipment			65,353						56,509
Furniture			5,594						1,540
Computers and software			981						700
Leasehold improvements			104,410						103,813
Construction in progress			188,731						166,655
			444,053						332,213
Less: Accumulated depreciation and amortization			(58,021)						(41,951)
Property, plant and equipment, net			$	386,032					$	290,262

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Schedule of Current Products

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Tabular disclosure of physical assets used in the normal conduct of business and not intended for resale. Includes, but is not limited to, balances by class of assets, depreciation and depletion expense and method used, including composite depreciation, and accumulated deprecation.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-SubTopic 10
-Topic 360
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482099/360-10-50-1

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