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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.