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Income Taxes - Additional Information (Details) - USD ($)	12 Months Ended
	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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