Income Tax Expense - Additional information (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2021	Sep. 30, 2020
Income Tax Expense [Line Items]
Operating Loss Carryforwards, Valuation Allowance	$ 500
Net operating loss carryforward - foreign	4,279	$ 3,678
Deferred Tax Assets, Operating Loss Carryforwards, Not Subject to Expiration	13,300
Deferred Tax Assets, Operating Loss Carryforwards, Subject to Expiration	2,100
Deferred Tax Assets, Operating Loss Carryforwards, State and Local	500
Deferred Tax Assets, Tax Credit Carryforwards, Research	2,600
State Research And Other Credit CarryForwards With Expiration Date	1,900
State Research And Other Credit Carry Forwards Without Expiration Date	800
Deferred Tax Assets, Valuation Allowance	2,011	1,932
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount	100	2,600
Tax Credit Carryforward, Amount	200
Foreign Valuation Allowance
Income Tax Expense [Line Items]
Operating Loss Carryforwards, Valuation Allowance	900	$ 800
State and Local Jurisdiction
Income Tax Expense [Line Items]
Operating Loss Carryforwards, Valuation Allowance	600
Net operating loss carryforward - foreign	$ 15,500