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Share Based Compensation - Restricted Ordinary Shares (Narratives) (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2016
Share-based Compensation Arrangement by Share-based Payment Award
Share based compensation expense	$ 3,393	$ 6,765	$ 3,153	$ 2,257
Non-employee compensation expense	$ 50	$ 100
Restricted Ordinary Shares
Share-based Compensation Arrangement by Share-based Payment Award
Granted (shares)	0	0
Vested (shares)	106,233
Unrecognized stock based compensation	$ 1,100
Non-employee compensation expense	$ 100	$ 1,000	$ 200
Restricted Ordinary Shares | Service Based
Share-based Compensation Arrangement by Share-based Payment Award
Granted (shares)			439
Restricted Ordinary Shares | Service and Performance Based
Share-based Compensation Arrangement by Share-based Payment Award
Granted (shares)			641,711
Restricted Ordinary Shares | Performance Based
Share-based Compensation Arrangement by Share-based Payment Award
Vested (shares)		159,490	24,896
Share based compensation expense		$ 1,000	$ 800

X

- Definition

Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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- Definition

Unrecognized cost of unvested share-based awards, other than options, awarded to employees as compensation.

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- Definition

Fair value of share-based compensation granted to nonemployees as payment for services rendered or acknowledged claims.

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The number of grants made 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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The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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