Nature of Operations and Summary of Significant Accounting Policies - Summary of Property and Equipment (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Sep. 30, 2018
Property, Plant and Equipment [Line Items]
Property, plant and equipment, at cost	$ 8,230	$ 7,770
Less: accumulated depreciation and amortization	(3,999)	(3,105)
Total property and equipment, net	4,231	4,665
Leasehold improvements
Property, Plant and Equipment [Line Items]
Property, plant and equipment, at cost	3,575	3,825
Equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment, at cost	3,041	2,604
Capitalized internal-use software development costs
Property, Plant and Equipment [Line Items]
Property, plant and equipment, at cost	1,088	916
Furniture and fixtures
Property, Plant and Equipment [Line Items]
Property, plant and equipment, at cost	$ 526	$ 425