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Share Based Compensation - Compensation Expense (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
Total share-based compensation	$ 3,393	$ 6,765	$ 3,153	$ 2,257
Unrecognized stock based compensation	$ 42,000
Period for recognition of share based compensation (years)	3 years 9 months 18 days
Research and development
Share-based Compensation Arrangement by Share-based Payment Award
Total share-based compensation	$ 1,906	3,116	1,145	916
General and administrative
Share-based Compensation Arrangement by Share-based Payment Award
Total share-based compensation	$ 1,487	$ 3,649	$ 2,008	$ 1,341

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.

+ References

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- Definition

Unrecognized cost of unvested share-based compensation awards.

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- Definition

Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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- Definition

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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