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Redeemable Convertible Preferred Stock (converted to Common Stock) - Additional Information (Details) - shares
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Temporary Equity [Line Items]                
Number of common stock shares issued upon conversion [1]       12,048,671        
Redeemable Convertible Preferred Stock                
Temporary Equity [Line Items]                
Number of common stock shares issued upon conversion 12,048,671              
Number of shares outstanding 0 97,166,921 97,166,921 97,166,921 97,166,921 40,162,506 40,162,506 40,094,850
[1]

Adjusted to reflect the Exchange Ratio.