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Intangible Assets - Schedule of Intangible Assets (Details) - USD ($) | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Mar. 31, 2024 | Mar. 31, 2023 | Mar. 31, 2024 | Mar. 31, 2023 | Sep. 30, 2023
Finite Lived Intangible Assets [Line Items] |  |  |  |  |
Net Carrying Amount | $ 9,412,000 |  | $ 9,412,000 |  | $ 10,262,000
Amortization expense | 400,000 | $ 400,000 | 900,000 | $ 900,000 |
Novartis |  |  |  |  |
Finite Lived Intangible Assets [Line Items] |  |  |  |  |
Gross Carrying Amount | 24,857,000 |  | 24,857,000 |  | 24,857,000
Accumulated Amortization | 15,445,000 |  | 15,445,000 |  | 14,595,000
Impairment | 0 |  | 0 |  | 0
Net Carrying Amount | 9,412,000 |  | 9,412,000 |  | 10,262,000
Novartis | Patents |  |  |  |  |
Finite Lived Intangible Assets [Line Items] |  |  |  |  |
Gross Carrying Amount | 21,728,000 |  | 21,728,000 |  | 21,728,000
Accumulated Amortization | 14,097,000 |  | 14,097,000 |  | 13,321,000
Impairment | 0 |  | 0 |  | 0
Net Carrying Amount | $ 7,631,000 |  | $ 7,631,000 |  | $ 8,407,000
Useful Lives | 14 years |  | 14 years |  | 14 years
Novartis | License |  |  |  |  |
Finite Lived Intangible Assets [Line Items] |  |  |  |  |
Gross Carrying Amount | $ 3,129,000 |  | $ 3,129,000 |  | $ 3,129,000
Accumulated Amortization | 1,348,000 |  | 1,348,000 |  | 1,274,000
Impairment | 0 |  | 0 |  | 0
Net Carrying Amount | $ 1,781,000 |  | $ 1,781,000 |  | $ 1,855,000
Useful Lives | 21 years |  | 21 years |  | 21 years

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- Definition The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 45 -Paragraph 28 -Subparagraph (b) -SubTopic 10 -Topic 230 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482740/230-10-45-28 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482686/350-30-45-2 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482665/350-30-50-2 + Details
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