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Stockholders' Equity - RSU Activity (Details) - RSUs	6 Months Ended
	Mar. 31, 2021 $ / shares shares
Number of Shares
Outstanding at September 30, 2020 (in shares) | shares	2,661,943
Granted (in shares) | shares	706,412
Settled (in shares) | shares	(845,420)
Canceled (in shares) | shares	(77,635)
Outstanding at March 31, 2021 (in shares) | shares	2,445,300
Weighted-Average Fair Market Value Per Share
Outstanding at September 30, 2020 (in dollars per share) | $ / shares	$ 7.95
Granted (in dollars per share) | $ / shares	12.27
Settled (in dollars per share) | $ / shares	7.39
Canceled (in dollars per share) | $ / shares	9.20
Outstanding at March 31, 2021 (in dollars per share) | $ / shares	$ 9.35

X

- Definition

Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event.

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The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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Per share or unit weighted-average fair value of nonvested award under share-based payment arrangement. Excludes share and unit options.

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Number of non-option equity instruments exercised by participants.

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Number of equity instruments other than options outstanding, including both vested and non-vested instruments.

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