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Public Offering - Additional Information (Details) - USD ($)
 9 Months Ended 12 Months Ended
Feb. 05, 2019
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
Dec. 31, 2020
Dec. 31, 2018
Class Of Stock [Line Items]            
Unit price (in dollars per Unit)   $ 64.96   $ 64.96    
Class A Common Stock            
Class Of Stock [Line Items]            
Common stock, par value   $ 0.00001   $ 0.00001 $ 0.00001 $ 0.00001
Gores Metropoulos, Inc.            
Class Of Stock [Line Items]            
Proceeds from sale of Units in initial public offering $ 400,000,000 $ 400,000,000 $ 400,000,000 $ 400,000,000    
Percentage of deferred underwriting discount   3.50%   3.50%    
Gores Metropoulos, Inc. | IPO            
Class Of Stock [Line Items]            
Units sold 40,000,000          
Sale of common stock (in shares) 40,000,000          
Unit price (in dollars per Unit) $ 10.00          
Proceeds from sale of Units in initial public offering $ 400,000,000          
Upfront underwriting discount (as a percent) 2.00%          
Upfront underwriting discount $ (8,000,000)          
Percentage of deferred underwriting discount 3.50%     3.50%    
Deferred underwriting discount $ (14,000,000)          
Gores Metropoulos, Inc. | Over-Allotment Option            
Class Of Stock [Line Items]            
Units sold 2,500,000          
Gores Metropoulos, Inc. | Warrant            
Class Of Stock [Line Items]            
Warrant exercisable term if business combination is completed   30 days   30 days    
Warrant exercisable term from closing of public offer   12 months   12 months    
Warrant expiration term   5 years   5 years    
Number of months to complete business combination   24 months   24 months    
Gores Metropoulos, Inc. | Class A Common Stock            
Class Of Stock [Line Items]            
Sale of common stock (in shares)     40,000,000 40,000,000    
Unit price (in dollars per Unit)     $ 10.00 $ 10.00    
Common stock, par value   $ 0.0001   $ 0.0001   $ 0.0001
Gores Metropoulos, Inc. | Class A Common Stock | IPO            
Class Of Stock [Line Items]            
Sale of common stock (in shares) 40,000,000     40,000,000    
Gores Metropoulos, Inc. | Class A Stock            
Class Of Stock [Line Items]            
Sale of common stock (in shares) 40,000,000          
Number of shares that contribute each unit 1 1        
Common stock, par value   $ 0.0001   $ 0.0001    
Number of shares warrant may be converted   1        
Gores Metropoulos, Inc. | Class A Stock | Warrant            
Class Of Stock [Line Items]            
Number of shares warrant may be converted       1    
Warrants exercise price (in dollars per share)   $ 11.50   $ 11.50