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Stockholders' Equity - Stock Option Activity (Details) - $ / shares	12 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2018
Number of Shares
Outstanding, beginning balance (in shares)	1,162,505	1,686,902	2,806,364
Granted (in shares)	0	92,610	409,368
Exercised (in shares)	(329,878)	(580,861)	(1,384,647)
Canceled (in shares)	(15,910)	(36,146)	(144,183)
Outstanding, ending balance (in shares)	816,717	1,162,505	1,686,902	2,806,364
Weighted- Average Exercise Price Per Share
Outstanding, beginning balance (in dollars per share)	$ 7.51	$ 7.00	$ 4.75
Granted (in dollars per share)	0	9.49	9.59
Exercised (in dollars per share)	7.63	6.15	3.25
Canceled (in dollars per share)	9.41	10.76	6.62
Outstanding, ending balance (in dollars per share)	$ 7.42	$ 7.51	$ 7.00	$ 4.75
Weighted- Average Remaining Contractual Term (in Years)
Outstanding	5 years 9 months 18 days	6 years 1 month 6 days	5 years 4 months 24 days	4 years 7 months 6 days
Vested and Expected to Vest at September 30, 2021
Outstanding (in shares)	816,717
Exercisable (in shares)	628,763
Outstanding, weighted average exercise price (in dollars per share)	$ 7.42
Exercisable, weighted average exercise price (in dollars per share)	$ 6.79
Outstanding, weighted average remaining contractual term (in years)	5 years 9 months 18 days
Exercisable, weighted average remaining contractual term (in years)	5 years 3 months 18 days

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Number of fully vested and expected to vest exercisable options that may be converted into shares under option plan. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

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Weighted average price at which option holders acquired shares when converting their stock options into shares.

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