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Goodwill and Intangible Assets (Tables) | 12 Months Ended
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Sep. 30, 2016
Goodwill And Intangible Assets Disclosure [Abstract] |
Schedule of Intangible Assets Subject to Amortization | Intangible assets balances, subject to amortization, at September 30, 2016 and 2015 consisted of the following (in thousands):
| September 30, 2016 |  |  | September 30, 2015 |
| Gross |  |  |  |  |  |  | Net |  |  | Gross |  |  |  |  |  |  | Net |
| Carrying |  |  | Accumulated |  |  | Carrying |  |  | Carrying |  |  | Accumulated |  |  | Carrying |
| Value |  |  | Amortization |  |  | Value |  |  | Value |  |  | Amortization |  |  | Value |
Purchased technology | $ | 11,749 |  |  | $ | (10,693 | ) |  | $ | 1,056 |  |  | $ | 11,749 |  |  | $ | (10,359 | ) |  | $ | 1,390 |
Schedule of Estimated Amortization Expense | Estimated amortization expense for each of the five subsequent fiscal years is expected to be (in thousands):
Years Ending September 30, |  | Total |
2017 |  | $ | 352 |
2018 |  |  | 352 |
2019 |  |  | 352 |
2020 |  |  | ― |
2021 |  |  | ― |

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- Definition Tabular disclosure of assets, excluding financial assets and goodwill, lacking physical substance with a finite life, by either major class or business segment. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16265-109275 + Details
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- Definition Tabular disclosure of the amount of amortization expense expected to be recorded in succeeding fiscal years for finite-lived intangible assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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