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Stock-based compensation - Restricted Stock (Details) - USD ($)
$ / shares in Units, $ in Thousands
1 Months Ended 6 Months Ended
Feb. 28, 2021
Jun. 30, 2022
Jun. 30, 2021
Dec. 31, 2021
Share-based compensation        
Proceeds from issuance of restricted Class A stock award     $ 523  
Restricted Stock        
Share-based compensation        
Vesting Period 4 years      
Proceeds from issuance of restricted Class A stock award $ 500      
Number of shares        
Unvested as of December 31, 2021 (in shares)   248,903    
Granted (in shares) 248,903      
Vested (in shares)   (82,967)    
Unvested as of June 30, 2022 (in shares)   165,936    
Weighted average fair value        
Unvested as of December 31, 2021 (in dollars per share)   $ 2.10    
Granted (in dollars per share) $ 2.10      
Vested (in dollars per share)   2.10    
Unvested as of June 30, 2022 (in dollars per share)   $ 2.10    
Restricted Stock | Other long-term liabilities        
Share-based compensation        
Amount of restricted common stock liability   $ 300   $ 500