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Share Based Compensation - Share Options Rollforward (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Sep. 30, 2018	Sep. 30, 2017
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding
Beginning balance (shares)	570,309	0
Granted (shares)	1,513,218	570,537
Exercised (shares)	0	0
Canceled or forfeited (shares)	(18,046)	(228)
Ending balance (shares)	2,065,481	570,309
Shares Exercisable (shares)		166,262
Vested and expected to vest (shares)		2,065,481
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price
Beginning balance (weighted average exercise price)	$ 0.51	$ 0.00
Granted (weighted average exercise price)	13.33	0.51
Exercised (weighted average exercise price)	0.00	0.00
Canceled or forfeited (weighted average exercise price)	4.99	0.00
Ending balance (weighted average exercise price)	$ 9.87	0.51
Exercisable (weighted average exercise price)		0.52
Vested or expected to vest (weighted average exercise price)		$ 9.87
Options outstanding (weighted- average remaining contractual term years)	9 years 4 months 6 days	9 years 8 months 23 days
Options exercisable (weighted- average remaining contractual term years)		8 years 8 months 23 days
Vested and expected to vest (weighted- average remaining contractual term years)		9 years 4 months 6 days
Options outstanding (aggregate intrinsic value)	$ 43,146	$ 2,024
Options exercisable (aggregate intrinsic value)		5,022
Options vested and expected to vest (aggregate intrinsic value)		$ 43,146

X

- Definition

The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

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The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.

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For presentations that combine terminations, the number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan or that expired.

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Weighted average price of options that were either forfeited or expired.

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Gross number of share options (or share units) granted during the period.

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Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding.

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Number of options outstanding, including both vested and non-vested options.

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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Amount by which current fair value of underlying stock exceeds exercise price of fully vested and expected to vest options outstanding. 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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Number of fully vested and expected to vest options outstanding that can 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 exercise price, at which grantee can acquire shares reserved for issuance, for fully vested and expected to vest options outstanding. 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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Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.

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Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options outstanding and currently exercisable.

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Weighted average remaining contractual term for vested portions of options outstanding and currently exercisable or convertible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Number of share options (or share units) exercised during the current period.

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