Accrued Expenses and Other Current Liabilities - Schedule of Product Warranty Accruals (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2019
Movement in Standard Product Warranty Accrual [Roll Forward]
Balance at beginning of period	$ 803	$ 654	$ 642
Provision for product warranty expense	505	626	186
Warranty liability assumed in acquisition liability	0	0	80
Adjustments and utilization of warranty accrual	(183)	(477)	(254)
Balance at end of period	$ 1,125	$ 803	$ 654