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Recent Accounting Pronouncements - Revenue Recognition (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Sep. 30, 2020
Jan. 01, 2019
Dec. 31, 2018
 [1]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Accumulated deficit $ (52,669) [1] $ (407,961)   $ (218,553)
Accounting Standards Update 2014-09 [Member]        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Revenue, Practical Expedient, Incremental Cost of Obtaining Contract [true false] true      
Accounting Standards Update 2014-09 [Member] | Cumulative Effect, Period of Adoption, Adjustment        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Accumulated deficit     $ 125,464  
Accounting Standards Update 2014-09 [Member] | Cumulative Effect, Period of Adoption, Adjustment, Net Of Tax        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Accumulated deficit     101,489  
ASC Topic 340-40 | Cumulative Effect, Period of Adoption, Adjustment        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Accumulated deficit     7,734  
ASC Topic 340-40 | Cumulative Effect, Period of Adoption, Adjustment, Net Of Tax        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Accumulated deficit     $ 6,333  
[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.