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Stockholders' equity - Common Stock (Details) - USD ($)
Jul. 06, 2021
Mar. 05, 2020
Dec. 31, 2021
Dec. 31, 2020
Class of Stock [Line Items]        
Common stock, shares authorized (in shares)     110,000,000 110,000,000
Common stock, shares issued (in shares)     66,850,941 50,878,780
Price per share (in Dollars per share) $ 15.03      
Common stock, shares outstanding (in shares)     66,850,941 50,878,780
Stock options vested, shares (in shares)   2,400,000    
Follow On Public Offering        
Class of Stock [Line Items]        
Sale of stock, number of shares issued in transaction (in shares) 11,600,000      
Follow On Public Offering - Shares From Parent        
Class of Stock [Line Items]        
Sale of stock, number of shares issued in transaction (in shares) 5,500,000      
Sale of stock, consideration received on transaction $ 78,300,000      
Follow On Public Offering - Shares From Selling Shareholders        
Class of Stock [Line Items]        
Sale of stock, number of shares issued in transaction (in shares) 6,100,000      
Sale of stock, consideration received on transaction $ 0      
Initial Offering | ChaSerg | Equity Unit        
Class of Stock [Line Items]        
Sale of stock, number of shares issued in transaction (in shares)   22,000,000    
Common Stock        
Class of Stock [Line Items]        
Common stock, shares authorized (in shares)     110,000,000  
Common stock, shares issued (in shares)   50,800,000    
Common stock, shares outstanding (in shares)     66,900,000