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Stockholders’ deficit and stock-based compensation - Restricted stock units, narrative (Details) - $ / shares
1 Months Ended 3 Months Ended 12 Months Ended
Nov. 15, 2021
Aug. 31, 2021
Mar. 31, 2022
Dec. 31, 2021
Dec. 31, 2021
Executive Officers          
Class of Stock [Line Items]          
Percent of aggregate proceeds received     2.00%    
Mr. Mercer          
Class of Stock [Line Items]          
Shares withheld for tax withholding obligation (in shares)     2,579,585    
Mr. Mercer | Class A Common Stock          
Class of Stock [Line Items]          
Grants in period (in shares)     2,670,415    
Mr. Wendel          
Class of Stock [Line Items]          
Shares withheld for tax withholding obligation (in shares)     2,577,541    
Mr. Wendel | Class A Common Stock          
Class of Stock [Line Items]          
Grants in period (in shares)     2,672,459    
Restricted Stock Units          
Class of Stock [Line Items]          
Grants in period (in shares)     9,172,637   29,763,009
Vesting period     3 years    
RSUs granted (in dollars per share)     $ 3.69   $ 10.70
Restricted Stock Units | Executive Officers          
Class of Stock [Line Items]          
Grants in period (in shares)   10,500,000      
Restricted Stock Units | Mr. Mercer          
Class of Stock [Line Items]          
Grants in period (in shares)     923,695 4,000,000  
Restricted Stock Units | Mr. Wendel          
Class of Stock [Line Items]          
Grants in period (in shares)     742,972 2,750,000  
Market-based RSUs          
Class of Stock [Line Items]          
Grants in period (in shares)     111,168    
Market-based RSUs | Mr. Mercer          
Class of Stock [Line Items]          
Grants in period (in shares) 5,250,000        
Market-based RSUs | Mr. Wendel          
Class of Stock [Line Items]          
Grants in period (in shares) 4,500,000        
Service-based RSUs          
Class of Stock [Line Items]          
Grants in period (in shares)     1,055,773   1,340,974
Restricted Stock          
Class of Stock [Line Items]          
Grants in period (in shares)     0