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Goodwill and Intangible Assets - Intangible Assets Subject to Amortization (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2017
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Amortization of intangible assets | $ 500 | $ 500 | $ 500 | $ 500 | $ 500 | $ 600 | $ 600 | $ 700 | $ 6,126 | $ 6,594 | $ 12,709
Gross Carrying Amount | 113,807 |  |  |  | 110,987 |  |  |  | 113,807 | 110,987 |
Accumulated Amortization | (99,668) |  |  |  | (96,451) |  |  |  | (99,668) | (96,451) |
Total | 14,139 |  |  |  | 14,536 |  |  |  | 14,139 | 14,536 |
Completed technology |  |  |  |  |  |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Amortization of intangible assets |  |  |  |  |  |  |  |  | 1,974 | 2,380 | 6,511
Gross Carrying Amount | 82,724 |  |  |  | 82,295 |  |  |  | 82,724 | 82,295 |
Accumulated Amortization | (77,331) |  |  |  | (77,400) |  |  |  | (77,331) | (77,400) |
Total | 5,393 |  |  |  | 4,895 |  |  |  | $ 5,393 | $ 4,895 |
Average Life |  |  |  |  |  |  |  |  | 5 years | 5 years |
Customer contracts and relationships |  |  |  |  |  |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Amortization of intangible assets |  |  |  |  |  |  |  |  | $ 4,098 | $ 4,214 | 6,009
Gross Carrying Amount | 30,583 |  |  |  | 28,692 |  |  |  | 30,583 | 28,692 |
Accumulated Amortization | (22,283) |  |  |  | (19,051) |  |  |  | (22,283) | (19,051) |
Total | 8,300 |  |  |  | 9,641 |  |  |  | $ 8,300 | $ 9,641 |
Average Life |  |  |  |  |  |  |  |  | 8 years | 8 years |
Trade names |  |  |  |  |  |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Amortization of intangible assets |  |  |  |  |  |  |  |  | $ 25 | $ 0 | 189
Gross Carrying Amount | 150 |  |  |  | 0 |  |  |  | 150 | 0 |
Accumulated Amortization | (25) |  |  |  | 0 |  |  |  | (25) | 0 |
Total | 125 |  |  |  | 0 |  |  |  | $ 125 | $ 0 |
Average Life |  |  |  |  |  |  |  |  | 1 year | 0 years |
Non-compete agreements |  |  |  |  |  |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Amortization of intangible assets |  |  |  |  |  |  |  |  | $ 29 | $ 0 | $ 0
Gross Carrying Amount | 350 |  |  |  | 0 |  |  |  | 350 | 0 |
Accumulated Amortization | (29) |  |  |  | 0 |  |  |  | (29) | 0 |
Total | $ 321 |  |  |  | $ 0 |  |  |  | $ 321 | $ 0 |
Average Life |  |  |  |  |  |  |  |  | 2 years | 0 years |

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- Definition The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3602-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274 + Details
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