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Leases - Lease Cost (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Mar. 31, 2021
Mar. 31, 2020
Lease, Cost [Abstract]        
Operating lease cost $ 897 $ 815 $ 1,758 $ 1,629
Variable lease cost 251 214 519 237
Short-term Lease, Cost 34 16 66 54
Total lease cost $ 1,182 $ 1,045 $ 2,343 $ 1,920