Significant Accounting Policies - Additional Information (Details) $ in Thousands	9 Months Ended	12 Months Ended
	Jun. 30, 2021 USD ($) Customer	Sep. 30, 2020 USD ($) Customer
Significant Accounting Policies [Line Items]
Estimated fair value of cash and cash equivalents	$ 69,230	$ 101,437
ASU 2016-13
Significant Accounting Policies [Line Items]
Change In Accounting Principle Accounting Standards Update Adopted	true
Change In Accounting Principle Accounting Standards Update Adoption Date	Oct. 01, 2020
Change in Accounting Principle, Accounting Standards Update, Immaterial Effect	true
Concentration of Credit Risk | Accounts Receivable, Net
Significant Accounting Policies [Line Items]
Number of major customers | Customer	3	2
Concentration of Credit Risk | Accounts Receivable, Net | Customer One
Significant Accounting Policies [Line Items]
Concentration risk, percentage	19.30%	14.80%
Concentration of Credit Risk | Accounts Receivable, Net | Customer Two
Significant Accounting Policies [Line Items]
Concentration risk, percentage	11.60%	10.90%
Concentration of Credit Risk | Accounts Receivable, Net | Customer Three
Significant Accounting Policies [Line Items]
Concentration risk, percentage	10.30%
Money-Market Funds | Level 1
Significant Accounting Policies [Line Items]
Estimated fair value of cash and cash equivalents	$ 56,200