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Summary of Significant Accounting Policies (Details) - USD ($)
$ in Thousands
9 Months Ended
Jan. 21, 2021
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Finite-Lived Intangible Assets [Line Items]        
Earnout shares (up to) (in shares) 6,945,732      
Restricted cash   $ 214   $ 605
Advertising expense   $ 13,674 $ 1,406  
Computer Software, Intangible Asset        
Finite-Lived Intangible Assets [Line Items]        
Useful life   3 years    
Common Stock        
Finite-Lived Intangible Assets [Line Items]        
Earnout shares (up to) (in shares) 7,500,000