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Leases - Summary of Lease Balances in Consolidated Balance Sheets (Details) - USD ($)
$ in Thousands
Mar. 31, 2022
Sep. 30, 2021
Leases [Abstract]    
Operating lease right-of-use assets $ 17,999 $ 19,919
Operating lease liabilities - current 2,216 2,261
Operating lease liabilities - long-term 17,582 19,374
Total operating lease liabilities $ 19,798 $ 21,635