Leases - Schedule of Financial Statement Classification of Lease Expenses Reported in Consolidated Statements of Operations (Detail) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2021	Sep. 30, 2020
Lessee Lease Description [Line Items]
Total lease cost	$ 1,005	$ 480
Cost of sales
Lessee Lease Description [Line Items]
Operating lease cost	536	208
Finance lease cost	5	16
Short-term lease cost	191	164
Selling, general and administrative expenses
Lessee Lease Description [Line Items]
Operating lease cost	256	84
Finance lease cost	$ 17	$ 8