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Goodwill and Intangible Assets - Narrative (Details) - USD ($) |  |  | 1 Months Ended | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | ---
Dec. 30, 2013 | Aug. 07, 2006 | Apr. 30, 2017 | Dec. 31, 2012 | Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2016 | Dec. 31, 2013
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |  |  |
Goodwill |  |  |  |  | $ 1,000,000 |  |  |  |
Impairment of goodwill |  |  |  |  | 0 | $ 0 | $ 0 |  |
Amortization of intangible assets |  |  |  |  | 177,000 | 205,000 | 355,000 |  |
Cash received from amended supply agreement | $ 10,000,000 |  | $ 2,300,000 |  | 0 | 0 | 2,333,000 |  |
Additional amount paid on execution of agreement | $ 7,000,000 |  |  |  |  |  |  |  |
Acquired finite-lived intangible assets, period | 3 years |  |  |  |  |  |  |  |
Deferred credit |  |  |  |  |  |  |  |  | $ 8,100,000
Deferred credit amortization period |  |  |  | 4 years |  |  |  |  |
Gains in other income |  |  |  |  | 0 | 747,000 | 2,029,000 |  |
Other Income |  |  |  |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |  |  |
Gains in other income |  |  |  |  |  | 500,000 | $ 2,000,000 | $ 2,000,000 |
Purchased Technology |  |  |  |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |  |  |
Purchased technology |  |  |  |  | $ 334,000 | $ 510,000 |  |  |
Supply Agreement |  |  |  |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |  |  |
Useful life of intangible asset |  | 15 years |  |  |  |  |  |  |

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- Definition Weighted average amortization period of finite-lived intangible assets acquired either individually or as part of a group of assets, 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 350 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16265-109275 + Details
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