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Employee Benefit Plans	3 Months Ended
	Dec. 31, 2018
Retirement Benefits [Abstract]
Employee Benefit Plans	Employee Benefit Plans In the United Kingdom, the Company makes contributions to private defined benefit pension schemes on behalf of its employees. The Company expensed $0.2 million, $0.5 million, $0.3 million and $0.1 million in contributions for the three months ended December 31, 2018 and years ended September 30, 2018, 2017 and 2016, respectively. In the United States, the Company established a defined contribution savings plan under Section 401(k) of the Internal Revenue Code in October 2018. The plan covers substantially all U.S. employees who meet minimum age and service requirements and allows participants to defer a portion of their annual compensation on a pre-tax basis. The Company matches employee contributions up to four percent of the employee’s annual salary. For the three months ended December 31, 2018, the Company incurred $18,000 in matching expenses. The Company pays all administrative fees related to the 401(k) plan.

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- References

No definition available.

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- Definition

The entire disclosure for pension and other postretirement benefits.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-URI http://asc.fasb.org/topic&trid=2235017

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