Nature of Operations and Summary of Significant Accounting Policies - Summary of Property and Equipment (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Sep. 30, 2019
Property, Plant and Equipment [Line Items]
Property, plant and equipment, at cost	$ 9,165	$ 8,230
Less: accumulated depreciation and amortization	(5,555)	(3,999)
Total property and equipment, net	3,610	4,231
Leasehold improvements
Property, Plant and Equipment [Line Items]
Property, plant and equipment, at cost	3,639	3,575
Equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment, at cost	3,545	3,041
Capitalized internal-use software development costs
Property, Plant and Equipment [Line Items]
Property, plant and equipment, at cost	1,363	1,088
Furniture and fixtures
Property, Plant and Equipment [Line Items]
Property, plant and equipment, at cost	$ 618	$ 526