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Income Taxes - Additional Information (Details) - USD ($) | 12 Months Ended
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Sep. 30, 2020 | Sep. 30, 2019
Income Taxes [Line Items] |  |
Net (decrease) increase in total valuation allowance | $ (200,000) | $ 500,000
Research and development credits carryforwards | 6,264,000 | $ 5,570,000
Unrecognized tax benefits that will impact the company's effective tax rate | 1,800,000 |
Accrued interest or penalties related to uncertain tax positions | 0 |
Federal |  |
Income Taxes [Line Items] |  |
Net operating loss carryforwards | 16,000,000.0 |
Net operating losses that can be carried forward indefinitely | 2,200,000 |
Net operating losses subject to expiration | 13,800,000 |
Federal | Research and development credit |  |
Income Taxes [Line Items] |  |
Research and development credits carryforwards | 3,200,000 |
Federal | Tax Year 2020 |  |
Income Taxes [Line Items] |  |
Net operating loss carryforwards | 0 |
State |  |
Income Taxes [Line Items] |  |
Net operating losses subject to expiration | 28,100,000 |
State | Research and development credit | California |  |
Income Taxes [Line Items] |  |
Research and development credits carryforwards | $ 2,800,000 |

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