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Commitments and Contingencies - Contingent Acquisition Obligations (Details) - USD ($) $ in Thousands |  | 3 Months Ended
--- | --- | ---
Dec. 31, 2017 | Sep. 30, 2019 | Sep. 30, 2018
Contingent Acquisition Obligations |  |  |
Beginning fair value |  | $ 16,577 |
Foreign currency translation adjustment |  | (147) |
Changes in fair value for contingent earnout obligations |  | 148 |
Ending fair value |  | 16,578 |
Mr. Chopra, Chief Executive Officer | Deferred bonus |  |  |
Indemnifications and Certain Employment-Related Contingencies |  |  |
Bonus payment on or within 45 days of January 1, 2024 contingent upon continued employment through that date | $ 13,500 |  |
Maximum number of days after January 1, 2024, bonus payment due | 45 days |  |
CXR Limited |  |  |
Contingent Acquisition Obligations |  |  |
Remaining maximum amount of contingent consideration |  | 26,800 |
Payments for contingent consideration |  | $ 100 | $ 200

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- Definition Maximum period the entity is required to make the payment after a date under the deferred compensation arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition Amount of increase (decrease) in the value of a contingent consideration liability, including, but not limited to, differences arising upon settlement. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 4 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e7008-128479 + Details
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