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Stockholders' Equity (Deficit) - Additional Information (Details) - USD ($)
$ / shares in Units, $ in Millions
1 Months Ended 9 Months Ended 12 Months Ended
Aug. 05, 2020
May 31, 2020
Sep. 30, 2020
Dec. 31, 2019
Aug. 04, 2020
Class Of Stock [Line Items]          
Stock options granted     1,352,000    
Weighted average exercise price of stock options granted     $ 14.44    
Fair value assumptions, expected term     6 years    
Fair value assumptions, expected volatility rate     50.00%    
Fair value assumptions, risk-free interest rate     0.71%    
Fair value assumptions, expected dividend yield     0.00%    
Unamortized stock-based compensation cost related to unvested stock options     $ 10.9    
Weighted-average period for recognition of unamortized stock-based compensation cost     2 years 9 months 18 days    
Preferred stock issued     0    
Preferred stock outstanding     0    
Series 1 Common Stock          
Class Of Stock [Line Items]          
Conversion of stock, converted into aggregate shares       29,390,733  
Series 1 Common Stock | Initial Public Offering          
Class Of Stock [Line Items]          
Stock issued price per share       $ 24 $ 24.00
Series 2 Common Stock          
Class Of Stock [Line Items]          
Conversion of stock, converted into aggregate shares       5,050,555  
Series F Preferred Stock          
Class Of Stock [Line Items]          
Dividend rate     10.00% 10.00%  
Adjusted dividend rate       8.00%  
Cumulative dividends       $ 12.8  
Restricted Stock Units (RSUs)          
Class Of Stock [Line Items]          
Unamortized stock-based compensation costs     $ 13.6    
Unamortized stock-based compensation costs, weighted-average period     3 years 8 months 12 days    
Restricted Stock Units (RSUs) | 2013 Stock Option Plan          
Class Of Stock [Line Items]          
Awards granted to officers and employees   1,216,000      
Awards granted to officers and employees, fair value per share   $ 15.51      
Service condition for awards satisfied period   4 years      
Vesting period 4 years        
Restricted Stock Units (RSUs) | 2020 Equity Incentive Plan          
Class Of Stock [Line Items]          
Awards granted to officers and employees     147,000    
Awards granted to officers and employees, fair value per share     $ 87.79    
Vesting period     4 years