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Goodwill and Intangible Assets (Narrative) (Details) - USD ($) | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Dec. 31, 2014 | Sep. 30, 2016 | Sep. 30, 2015 | Sep. 30, 2014 | Dec. 31, 2013
Finite Lived Intangible Assets [Line Items] |  |  |  |  |
Impairment of goodwill |  | $ 0 | $ 0 | $ 0 |
Amortization of intangible assets |  | 352,000 | 435,000 | 779,000 |
Cash received from amended supply agreement |  | 2,333,000 | 2,333,000 | 10,000,000 |
Other current assets |  | $ 2,457,000 | 3,916,000 |  |
Deferred credit amortization period |  | 4 years |  |  |
Gains in other income |  | $ 2,029,000 | 2,402,000 | $ 1,522,000 |
General Electric Company |  |  |  |  |
Finite Lived Intangible Assets [Line Items] |  |  |  |  |
Cash received from amended supply agreement | $ 10,000,000 |  |  |  |
Additional amount paid on execution of agreement |  | $ 7,000,000 |  |  |
Acquired finite-lived intangible assets, period |  | 3 years |  |  |
Other current assets |  | $ 2,300,000 |  |  |
Deferred credit |  |  |  |  | $ 8,100,000
Other Income | General Electric Company |  |  |  |  |
Finite Lived Intangible Assets [Line Items] |  |  |  |  |
Gains in other income |  | $ 2,000,000 | $ 2,000,000 |  |
Purchased Technology | Minimum |  |  |  |  |
Finite Lived Intangible Assets [Line Items] |  |  |  |  |
Useful life of intangible asset |  | 6 years |  |  |
Purchased Technology | Maximum |  |  |  |  |
Finite Lived Intangible Assets [Line Items] |  |  |  |  |
Useful life of intangible asset |  | 7 years |  |  |
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://www.xbrl.org/2003/role/presentationRef -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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