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Revenue Recognition - Contract Balances (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Sep. 30, 2021
Revenue from Contract with Customer [Abstract]          
Contract assets, current $ 5,125   $ 5,125   $ 4,080
Contract assets, non-current 4,922   4,922   4,409
Contract liabilities (deferred revenue), current 13,220   13,220   10,381
Contract liabilities (deferred revenue), non-current 1,409   1,409   $ 955
Revenue recognized included in contract liability balance at the beginning of the period $ 1,100 $ 600 $ 11,100 $ 8,500