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Stock-based compensation - Restricted Stock (Details) - USD ($)
$ / shares in Units, $ in Thousands
1 Months Ended 9 Months Ended
Feb. 28, 2021
Sep. 30, 2021
Dec. 31, 2020
Share-based compensation      
Proceeds from issuance of restricted stock award   $ 523  
Restricted Stock      
Share-based compensation      
Vesting Period 4 years    
Proceeds from issuance of restricted stock award $ 500    
Number of shares      
Granted (in shares) 248,903 248,903  
Unvested as of September 30, 2021 (in shares)   248,903  
Weighted average fair value      
Granted (in dollars per share) $ 2.10 $ 2.10  
Unvested as of September 30, 2021 (in dollars per share)   $ 2.10  
Restricted Stock | Other long-term liabilities      
Share-based compensation      
Amount of restricted common stock liability   $ 700 $ 0