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Revenue - Unearned Revenue (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Mar. 31, 2021
Mar. 31, 2020
Unearned Revenue [Roll Forward]        
Unearned revenue, beginning of period $ 13,066 $ 6,802 $ 9,341 $ 5,025
Billings 13,746 9,706 28,013 19,553
Revenue recognized (10,376) (7,806) (20,918) (15,876)
Unearned revenue, end of period $ 16,436 $ 8,702 $ 16,436 $ 8,702