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Nature of Operations and Summary of Significant Accounting Policies - Summary of Property and Equipment (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Sep. 30, 2020
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, at cost $ 8,417 $ 9,165
Less: accumulated depreciation and amortization (4,746) (5,555)
Total property and equipment, net 3,671 3,610
Leasehold improvements    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, at cost 2,623 3,639
Equipment    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, at cost 2,947 3,545
Capitalized internal-use software development costs    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, at cost 2,147 1,363
Furniture and fixtures    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, at cost $ 700 $ 618