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Debt - Schedule of Long-Term Debt (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Sep. 30, 2020
Debt Instrument [Line Items]    
Total loans $ 48,118 $ 63,125
Less unamortized issuance costs (2,319) (2,173)
Long-term Debt, Current Maturities 0 (1,972)
Total long-term debt, net of current portion $ 45,799 58,980
Weighted average interest rate on debt 1.34%  
Revolving loan    
Debt Instrument [Line Items]    
Total loans $ 48,118 15,000
Term loan    
Debt Instrument [Line Items]    
Total loans $ 0 $ 48,125