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Common stock and common stock warrants (Details)
$ / shares in Units, $ in Millions
 9 Months Ended 12 Months Ended
Sep. 30, 2021
USD ($)
Vote
$ / shares
shares
Dec. 31, 2020
USD ($)
$ / shares
shares
Jul. 19, 2021
shares
Common stock and common stock warrants      
Cash dividends | $ $ 0.0 $ 0.0  
Shares reserved 9,991,141 32,574,029  
Common Class A      
Common stock and common stock warrants      
Common stock, authorized (in shares) 210,000,000 35,000,000 210,000,000
Common stock, issued (in shares) 34,449,154 612,850  
Common stock, outstanding (in shares) 34,449,154 612,850  
Common stock, par value (in dollars per share) | $ / shares $ 0.01 $ 0.01  
Number of votes | Vote 1    
Common Class B      
Common stock and common stock warrants      
Common stock, authorized (in shares) 10,000,000 0 10,000,000
Common stock, issued (in shares) 6,903,379 0  
Common stock, outstanding (in shares) 6,903,379 0  
Common stock, par value (in dollars per share) | $ / shares $ 0.01 $ 0.01