General form of registration statement for all companies including face-amount certificate companies

Temporary Equity and Stockholders' Equity - Additional Information (Detail)

v3.21.2
Temporary Equity and Stockholders' Equity - Additional Information (Detail) - USD ($)
 9 Months Ended 12 Months Ended
Sep. 30, 2021
Dec. 31, 2020
Dec. 31, 2019
Class of Stock [Line Items]      
Common stock shares authorized 315,000,000 55,659,643 55,659,643
Common stock shares issued 71,810,419 30,281,520 30,309,350
Common stock shares outstanding 71,810,419 30,281,520 30,309,350
Preferred stock, redemption price per share   $ 1,000  
unpaid dividends for the preferred shares   $ 0  
Series A Preferred Stock [Member]      
Class of Stock [Line Items]      
Preferred stock shares authorized 7,765,229 7,765,229 7,765,229
Preferred stock shares issued 0 7,756,158 6,836,003
Preferred stock shares outstanding 0 7,756,158 6,836,003
Preference share discount rate 2.00% 2.00%  
Preferred stock, dividend rate, percentage 13.00% 13.00%  
Preferred stock, redemption amount $ 85,200,000    
Preferred stock redemption premium rate   1.00%  
Series A-1 Preferred Stock      
Class of Stock [Line Items]      
Preferred stock shares authorized 10,480,538 10,480,538 10,480,538
Preferred stock shares issued 0 7,862,107 6,949,524
Preferred stock shares outstanding 0 7,862,107 6,949,524
Preference share discount rate 2.00% 2.00%  
Preferred stock, dividend rate, percentage 13.75% 13.75%  
Preferred stock, redemption amount $ 86,900,000    
Preferred stock redemption premium rate 1.00% 1.00%  
Series C Convertible Preferred Stock [Member]      
Class of Stock [Line Items]      
Preferred stock shares authorized 6,872,894 6,872,894 6,872,894
Preferred stock shares issued 0 2,566,186 2,566,186
Preferred stock shares outstanding 0 2,566,186 2,566,186
Preferred stock, convertible, terms 1.5X    
Convertible preferred stock, shares issued upon conversion 16,802 0.15  
unpaid dividends for the preferred shares   $ 0  
Series B Preferred Stock [Member]      
Class of Stock [Line Items]      
Preferred stock shares authorized 9,090,975 9,090,975 9,090,975
Preferred stock shares issued 0 9,090,975 8,233,774
Preferred stock shares outstanding 0 9,090,975 8,233,774
Preferred stock, dividend rate, percentage 10.00% 10.00%  
Preferred stock, redemption amount $ 97,800,000    
Capital Stock [Member]      
Class of Stock [Line Items]      
Capital units, authorized 350,000,000    
Common stock shares issued 71,810,419    
Common stock shares outstanding 71,810,419    
Preferred stock shares authorized 35,000,000    
Preferred stock shares issued 0    
Preferred stock shares outstanding 0    
Common Stock [Member]      
Class of Stock [Line Items]      
Convertible preferred stock, shares issued upon conversion 2,520,368