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Basis of Presentation and Significant Accounting Policies - Effect of New Accounting Pronouncement (Details) - USD ($) $ in Thousands | 6 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2019 | Mar. 31, 2018 | Sep. 30, 2018 | Sep. 30, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Net cash used in operating activities |  | $ (3,067) | $ (17,515) |  |
Effect of Exchange Rate Changes on Cash, Cash Equivalents and Restricted Cash |  | (903) | 1,372 |  |
Net Decrease in Cash, Cash Equivalents and Restricted Cash |  | (4,357) | (15,604) |  |
Cash, Cash Equivalents and Restricted Cash, Beginning of Period | [1] | 58,139 | 60,157 | $ 62,496 | $ 75,761
Cash, Cash Equivalents and Restricted Cash, End of Period | [1] | $ 58,139 | 60,157 | $ 62,496 | 75,761
As reported |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Net cash used in operating activities |  |  | (1,805) |  |
Effect of Exchange Rate Changes on Cash, Cash Equivalents and Restricted Cash |  |  | 640 |  |
Net Decrease in Cash, Cash Equivalents and Restricted Cash |  |  | (626) |  |
Cash, Cash Equivalents and Restricted Cash, Beginning of Period |  |  | 50,495 |  | 51,121
Cash, Cash Equivalents and Restricted Cash, End of Period |  |  | $ 50,495 |  | $ 51,121
[1] | Includes Cash, Cash Equivalents and Restricted Cash that are included in Held-For-Sale Assets on the Condensed Consolidated Balance Sheets.

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- Definition Amount of cash and cash equivalents, and cash and cash equivalents restricted to withdrawal or usage. Excludes amount for disposal group and discontinued operations. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits. Cash equivalents include, but are not limited to, short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 24 -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3521-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3044-108585 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=98513485&loc=SL98516268-108586 + Details
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