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Accounts Payable and Accrued Expenses (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Sep. 30, 2020
Payables and Accruals [Abstract]    
Accounts payable $ 12,039 $ 12,471
Accrued compensation and benefits 19,377 28,053
Other accrued expenses 11,805 11,367
Total accounts payable and accrued expenses $ 43,221 $ 51,891