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Income Taxes (Details) - USD ($) $ in Thousands | 9 Months Ended |  |  |
--- | --- | --- | --- | ---
Sep. 30, 2020 | Dec. 31, 2019 | Dec. 31, 2017 | Jan. 01, 2017
Income Tax Examination [Line Items] |  |  |  |
Income tax benefit | $ 6,600 |  |  |
Reduction in developed technology value for federal income tax purposes | $ 194,273 | $ 213,210 |  |
Reduction of NOL carryforward |  | 2,800 |  |
Increase in deferred tax liability from income tax examination |  | 4,600 |  |
Write off of deferred tax asset related to TRA |  | $ 4,700 |  |
Developed technology |  |  |  |
Income Tax Examination [Line Items] |  |  |  |
Reduction in developed technology value for federal income tax purposes |  |  | $ 188,000 | $ 210,000

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