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Revenue Recognition - Contract Balances (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Sep. 30, 2021
Revenue from Contract with Customer [Abstract]    
Contract assets, current $ 4,406 $ 4,080
Contract assets, non-current 4,234 4,409
Contract liabilities (deferred revenue), current 8,168 10,381
Contract liabilities (deferred revenue), non-current $ 644 $ 955