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Stockholder's Equity - Additional Information (Details) - $ / shares
9 Months Ended
Sep. 01, 2021
Sep. 30, 2021
Dec. 31, 2020
Feb. 29, 2020
Feb. 28, 2019
Class Of Stock [Line Items]          
Common stock, shares authorized   2,370,000,000      
Preferred stock, shares authorized   100,000,000      
Preferred stock, par value per share   $ 0.0001      
Preferred stock, shares issued   0   3,764,606,000 3,764,606,000
Preferred stock, shares outstanding   0      
Class A Common Stock          
Class Of Stock [Line Items]          
Common stock, shares authorized   2,000,000,000 256,694,000    
Common stock, par value   $ 0.0001 $ 0.00001    
Common stock, shares issued   223,529,000 57,865,000    
Common stock, shares outstanding   223,529,000 57,865,000    
Class B Common Stock          
Class Of Stock [Line Items]          
Common stock, shares authorized   20,000,000 0    
Common stock, par value   $ 0.0001 $ 0    
Common stock, shares issued   14,816,000 0    
Common stock, shares outstanding   14,816,000 0    
Class C Common Stock          
Class Of Stock [Line Items]          
Common stock, shares authorized   250,000,000      
Common stock, par value   $ 0.0001      
Common stock, shares issued   0      
Common stock, shares outstanding   0      
Founder | Class B Common Stock          
Class Of Stock [Line Items]          
Common stock voting rights   10 votes per share      
Percentage of common stock transferred   75.00%      
Old Offerpad and Supernova          
Class Of Stock [Line Items]          
Common stock voting rights 10 votes per share        
Old Offerpad and Supernova | Minimum | Class B Common Stock          
Class Of Stock [Line Items]          
Percentage of common stock transferred 75.00%