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Income Taxes - Narrative (Details) - USD ($) | 12 Months Ended
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Sep. 30, 2022 | Sep. 30, 2021
Income Taxes [Line Items] |  |
Net increase (decrease) in total valuation allowance | $ 2,100,000 | $ 0
Unrecognized tax benefits that will impact the company's effective tax rate | 2,700,000 |
Accrued interest or penalties related to uncertain tax positions | 0 |
Federal |  |
Income Taxes [Line Items] |  |
Net operating loss carryforwards | 2,600,000 |
Federal | Research and development tax credit |  |
Income Taxes [Line Items] |  |
Tax credit carryforwards | 4,100,000 |
State |  |
Income Taxes [Line Items] |  |
Net operating losses subject to expiration | 28,800,000 |
State | Research and development tax credit | California |  |
Income Taxes [Line Items] |  |
Tax credit carryforwards | 3,800,000 |
Foreign Tax Authority | Research and development tax credit |  |
Income Taxes [Line Items] |  |
Tax credit carryforwards | $ 600,000 |

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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible operating loss carryforwards that are subject to expiration dates. + References No definition available. + Details
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- Definition Amount of operating loss carryforward, before tax effects, available to reduce future taxable income under enacted tax laws. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=121826272&loc=d3e32559-109319 + Details
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- Definition The amount of the tax credit carryforward, before tax effects, available to reduce future taxable income under enacted tax laws. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=121826272&loc=d3e32559-109319 + Details
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- Definition Amount accrued for interest on an underpayment of income taxes and penalties related to a tax position claimed or expected to be claimed in the tax return. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (c) -URI https://asc.fasb.org/extlink&oid=121826272&loc=d3e32718-109319 + Details
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- Definition The total amount of unrecognized tax benefits that, if recognized, would affect the effective tax rate. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=121826272&loc=SL6600010-109319 + Details
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