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Goodwill and Other Intangible Assets - Schedule of Goodwill and Other Intangible Assets (Details) - USD ($) | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Sep. 30, 2018 | Jul. 31, 2018 | Sep. 30, 2017 | Sep. 30, 2016
Goodwill And Other Intangible Assets [Line Items] |  |  |  |
Goodwill | $ 4,343,000 |  |  |
Total other intangible assets |  |  | $ 0 | $ 0
Other intangible assets, net | 8,006,000 |  |  |
Quantum |  |  |  |
Goodwill And Other Intangible Assets [Line Items] |  |  |  |
Goodwill | 4,343,000 | $ 4,300,000 |  |
Total other intangible assets | 8,200,000 | $ 8,200,000 |  |
Accumulated amortization | (194,000) |  |  |
Other intangible assets, net | $ 8,006,000 |  |  |
Weighted-Average Remaining Useful Lives (in years) | 11 years 3 months 18 days |  |  |
Quantum | Developed Technology |  |  |  |
Goodwill And Other Intangible Assets [Line Items] |  |  |  |
Total other intangible assets | $ 4,200,000 |  |  |
Weighted-Average Remaining Useful Lives (in years) | 17 years 9 months 18 days |  |  |
Quantum | Customer Relationships |  |  |  |
Goodwill And Other Intangible Assets [Line Items] |  |  |  |
Total other intangible assets | $ 2,500,000 |  |  |
Weighted-Average Remaining Useful Lives (in years) | 4 years 9 months 18 days |  |  |
Quantum | Trade Names |  |  |  |
Goodwill And Other Intangible Assets [Line Items] |  |  |  |
Total other intangible assets | $ 1,400,000 |  |  |
Weighted-Average Remaining Useful Lives (in years) | 3 years 9 months 18 days |  |  |
Quantum | Non-compete Agreements |  |  |  |
Goodwill And Other Intangible Assets [Line Items] |  |  |  |
Total other intangible assets | $ 100,000 |  |  |
Weighted-Average Remaining Useful Lives (in years) | 3 years 9 months 18 days |  |  |

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- Definition Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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