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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