Share-Based Compensation - Summary of information about stock options 2009 plan (Details) - Stock Based Incentive Compensation Plan 2009 - Exercise Price Range from Dollars 0.00 to Dollars 5.00 - Employee and Non Employee Stock Option	12 Months Ended
	Sep. 30, 2021 $ / shares
Information about stock options, by exercise price range
Exercise price, low end of range (in dollars per share)	$ 0.00
Exercise price, high end of range (in dollars per share)	$ 5.00
Options Outstanding - Weighted-Average Remaining Contractual Life	0 years