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Income Taxes - Additional Information (Details) - USD ($) | 12 Months Ended
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Sep. 30, 2019 | Sep. 30, 2018
Income Taxes [Line Items] |  |
Net increase in total valuation allowance | $ 500,000 | $ 400,000
Research and development credits carryforwards | 5,570,000 | $ 3,890,000
Unrecognized tax benefits that will impact the company's effective tax rate | 1,600,000 |
Accrued interest or penalties related to uncertain tax positions | 0 |
Federal |  |
Income Taxes [Line Items] |  |
Available net operating loss carryforwards | 29,500,000 |
Net operating losses that can be carried forward indefinitely | 2,100,000 |
Net operating losses subject to expiration | $ 27,400,000 |
Operating loss carryforwards, expiration start year | 2032 |
Research and development credits carryforwards, expiration start year | 2027 |
Federal | Research and development credit |  |
Income Taxes [Line Items] |  |
Research and development credits carryforwards | $ 2,800,000 |
State |  |
Income Taxes [Line Items] |  |
Available net operating loss carryforwards | $ 29,400,000 |
Operating loss carryforwards, expiration start year | 2028 |
State | Research and development credit | California |  |
Income Taxes [Line Items] |  |
Research and development credits carryforwards | $ 2,400,000 |

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