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Stockholders' Equity (Deficit) (Details)
$ in Thousands
12 Months Ended
Dec. 02, 2020
USD ($)
vote
shares
Dec. 31, 2020
USD ($)
vote
shares
Dec. 31, 2019
USD ($)
shares
Dec. 03, 2020
shares
Dec. 31, 2018
shares
Dec. 31, 2015
shares
Class of Stock [Line Items]            
Common stock, shares issued (in shares)       323,936,240    
Common stock, shares outstanding (in shares)       323,936,240    
Compensation expense | $   $ 8,711 $ 2,702      
Treasury stock, shares outstanding (in shares)   0 4,958,471      
Founders Preferred Stock            
Class of Stock [Line Items]            
Preferred stock, shares issued (in shares)   0 26,206,837     26,206,837
Conversion ratio           1
Chief Executive Officer | Gores Metropoulos            
Class of Stock [Line Items]            
Compensation expense | $ $ 3,000          
Chief Executive Officer | Gores Metropoulos | Founders Preferred Stock            
Class of Stock [Line Items]            
Shares converted (in shares) 22,935,412          
Class A Common Stock            
Class of Stock [Line Items]            
Common stock, shares authorized (in shares)   715,000,000 283,523,459      
Common stock, shares issued (in shares)   218,818,037 139,635,890 218,818,037    
Common stock, shares outstanding (in shares)   218,818,037 134,677,419 218,818,037    
Common stock, votes per share | vote   1        
Class A Common Stock | Common Stock            
Class of Stock [Line Items]            
Common stock, shares outstanding (in shares)   218,818,037 139,635,890   134,337,450  
Class A Common Stock | Chief Executive Officer | Gores Metropoulos            
Class of Stock [Line Items]            
Common stock, votes per share | vote 1          
Class A Common Stock | Chief Executive Officer | Gores Metropoulos | Common Stock            
Class of Stock [Line Items]            
Shares converted (in shares) 82,182,791          
Class B Common Stock            
Class of Stock [Line Items]            
Common stock, shares authorized (in shares)   121,000,000 0      
Common stock, shares issued (in shares)   105,118,203 0 105,118,203    
Common stock, shares outstanding (in shares)   105,118,203 0 105,118,203    
Common stock, votes per share | vote   10        
Class B Common Stock | Common Stock            
Class of Stock [Line Items]            
Common stock, shares outstanding (in shares)   105,118,203 0   0  
Class B Common Stock | Chief Executive Officer | Gores Metropoulos            
Class of Stock [Line Items]            
Common stock, votes per share | vote 10