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Stock-based compensation - Preferred Stock Warrants (Details) - Preferred stock warrants - $ / shares
Jun. 30, 2022
Nov. 30, 2020
Class of Warrant or Right [Line Items]    
Number of warrants outstanding (in shares) 3,247,637  
Weighted average exercise price (in usd per share)   $ 1.92
Number exercisable (in shares) 1,299,055  
Weighted average    
Class of Warrant or Right [Line Items]    
Weighted average exercise price (in usd per share) $ 1.92