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Share Based Compensation - 2018 Equity Incentive Plan (Narratives) (Details) - shares | 12 Months Ended |
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Sep. 30, 2018 | Jun. 30, 2018
Stock options |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |
Share based compensation term (years) | 10 years |
Vesting Group One |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |
Vesting period (years) | 4 years |
Award vesting percentage | 25.00% |
Vesting Group One | Performance Based |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |
Vesting period (years) | 4 years |
Award vesting percentage | 25.00% |
Vesting Group Two |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |
Vesting period (years) | 3 years |
Vesting Group Two | Performance Based |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |
Vesting period (years) | 3 years |
2018 Equity Incentive Plan |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |
Shares authorized for distribution (shares) | 14,000,000 |
Increase in reserved shares term | 10 years |
Periodical increase in authorized shares (percentage) |  | 4.00%
2018 Equity Incentive Plan | Ordinary shares |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |
Shares authorized for distribution (shares) |  | 3,281,622
2018 Equity Incentive Plan - New | Ordinary shares |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |
Shares authorized for distribution (shares) |  | 3,025,548
2018 Equity Incentive Plan - Shares Available Under 2017 Plan | Ordinary shares |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |
Shares authorized for distribution (shares) |  | 256,074

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- Definition Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition Percentage of vesting of share-based compensation awards. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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