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Income taxes - Provision for income taxes (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2019
Current
State	$ (29)		$ 108
Foreign	108	$ 382	184
Total Current	79	382	292
Deferred
Federal	(2,268)
State	259
Total Deferred	(2,009)
Income Tax Expense (Benefit), Total	$ (1,930)	$ 382	$ 292

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