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Leases - Summary of Lease Balances in Consolidated Balance Sheets (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Sep. 30, 2021
Leases [Abstract]    
Operating lease right-of-use assets $ 18,562 $ 19,919
Operating lease liabilities - current 2,192 2,261
Operating lease liabilities - long-term 18,127 19,374
Total operating lease liabilities $ 20,319 $ 21,635