Income Tax Expense - Additional information (Details) - USD ($)	1 Months Ended	12 Months Ended
	Dec. 22, 2017	Sep. 30, 2020	Sep. 30, 2019
Income Tax Expense [Line Items]
Operating Loss Carryforwards, Valuation Allowance		$ 500,000	$ 600,000
Net operating loss carryforward - foreign		3,678,000	3,766,000
Deferred Tax Assets, Operating Loss Carryforwards, Not Subject to Expiration		13,800,000
Deferred Tax Assets, Operating Loss Carryforwards, Subject to Expiration		200,000
Deferred Tax Assets, Operating Loss Carryforwards, State and Local		600,000
Deferred Tax Assets, Tax Credit Carryforwards, Research		2,400,000
State Research And Other Credit Carryforwards, With Expiration Date		1,700,000
State Research And Other Credit Carry Forwards Without Expiration Date		700,000
Deferred Tax Assets, Valuation Allowance		1,932,000	4,504,000
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount		2,600,000	2,600,000
Foreign Valuation Allowance
Income Tax Expense [Line Items]
Operating Loss Carryforwards, Valuation Allowance		800,000	3,600,000
State and Local Jurisdiction
Income Tax Expense [Line Items]
Operating Loss Carryforwards, Valuation Allowance		600,000	$ 400,000
Net operating loss carryforward - foreign		$ 14,000,000.0
Tax Cuts And Jobs Act
Income Tax Expense [Line Items]
Effective Income Taxes Foreign Withholding Taxes	$ 0