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Revenue from Contracts with Customers (Details) - USD ($) $ in Thousands | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2019 | Sep. 30, 2020 | Jan. 01, 2019 | Dec. 31, 2018 | [1]
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |  |
Accumulated deficit | $ (52,669) | [1] | $ (407,961) |  | $ (218,553)
Deferred revenues | $ 213,145 |  | 179,900 | $ 212,529 |
Perpetual licenses |  |  |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |  |
Perpetual licenses revenue , recognition term | 3 years |  |  |  |
Portfolio Balancing |  |  |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |  |
Deferred revenues | $ 18,060 |  | $ 18,231 |  |
Accounting Standards Update 2014-09 [Member] | Cumulative Effect, Period of Adoption, Adjustment |  |  |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |  |
Accumulated deficit |  |  |  | 125,464 |
Accounting Standards Update 2014-09 [Member] | Cumulative Effect, Period of Adoption, Adjustment, Net Of Tax |  |  |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |  |
Accumulated deficit |  |  |  | $ 101,489 |
[1] | Included in Accumulated deficit on the opening balance of January 1, 2019 is $107,822, net of tax, for the cumulative effect adjustment of adopting Topics 606 and 34040.

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