Stockholders' Equity - Summary of Common Stock Warrant Activity (Details) - Warrants - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended	12 Months Ended
	Sep. 30, 2021	Jun. 30, 2020
Class Of Stock [Line Items]
Number of Shares Underlying Warrants, Outstanding June 30, 2021	2,393,000
Number of Shares Underlying Warrants, Outstanding September 30, 2021	2,393,000
Weighted Average Exercise Price, Outstanding June 30, 2021	$ 2.40
Weighted Average Exercise Price, Outstanding September 30, 2021	$ 2.40
Aggregate Fair Market Value at Issuance, Outstanding June 30, 2021	$ 3,747
Aggregate Fair Market Value at Issuance, Outstanding September 30, 2020	$ 3,747
Weighted Average Remaining Contractual Term (Years), Outstanding	4 years 4 months 6 days	4 years 7 months 17 days