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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, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2018
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Amortization of intangible assets |  |  |  |  |  |  |  |  | $ 4,993 | $ 6,126 | $ 6,594
Gross Carrying Amount | $ 103,446 |  |  |  | $ 113,807 |  |  |  | 103,446 | 113,807 |
Accumulated Amortization | (94,210) |  |  |  | (99,668) |  |  |  | (94,210) | (99,668) |
Total | 9,236 |  |  |  | 14,139 |  |  |  | 9,236 | 14,139 |
Completed technology |  |  |  |  |  |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Amortization of intangible assets | 300 | $ 400 | $ 500 | $ 600 | 500 | $ 500 | $ 500 | $ 500 | 1,766 | 1,974 | 2,380
Gross Carrying Amount | 83,764 |  |  |  | 82,724 |  |  |  | 83,764 | 82,724 |
Accumulated Amortization | (80,136) |  |  |  | (77,331) |  |  |  | (80,136) | (77,331) |
Total | 3,628 |  |  |  | 5,393 |  |  |  | $ 3,628 | $ 5,393 |
Average Life |  |  |  |  |  |  |  |  | 5 years | 5 years |
Customer contracts and relationships |  |  |  |  |  |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Amortization of intangible assets |  |  |  |  |  |  |  |  | $ 2,927 | $ 4,098 | 4,214
Gross Carrying Amount | 19,332 |  |  |  | 30,583 |  |  |  | 19,332 | 30,583 |
Accumulated Amortization | (13,870) |  |  |  | (22,283) |  |  |  | (13,870) | (22,283) |
Total | 5,462 |  |  |  | 8,300 |  |  |  | $ 5,462 | $ 8,300 |
Average Life |  |  |  |  |  |  |  |  | 9 years | 8 years |
Trade names |  |  |  |  |  |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Amortization of intangible assets |  |  |  |  |  |  |  |  | $ 125 | $ 25 | 0
Gross Carrying Amount | 0 |  |  |  | 150 |  |  |  | 0 | 150 |
Accumulated Amortization | 0 |  |  |  | (25) |  |  |  | 0 | (25) |
Total | 0 |  |  |  | 125 |  |  |  | $ 0 | $ 125 |
Average Life |  |  |  |  |  |  |  |  | 0 years | 1 year |
Non-compete agreements |  |  |  |  |  |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Amortization of intangible assets |  |  |  |  |  |  |  |  | $ 175 | $ 29 | $ 0
Gross Carrying Amount | 350 |  |  |  | 350 |  |  |  | 350 | 350 |
Accumulated Amortization | (204) |  |  |  | (29) |  |  |  | (204) | (29) |
Total | $ 146 |  |  |  | $ 321 |  |  |  | $ 146 | $ 321 |
Average Life |  |  |  |  |  |  |  |  | 2 years | 2 years |

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