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Stock-Based Compensation - Restricted stock units activity (Details) - Unvested restricted stock units - $ / shares
 6 Months Ended
Jun. 30, 2023
Dec. 31, 2022
Number of Shares    
Outstanding, beginning balance (in shares) 7,501,945  
Granted (in shares) 7,742,983  
Vested (in shares) (2,447,672)  
Cancelled (in shares) (345,516)  
Outstanding, ending balance (in shares) 12,451,740  
Grant Date Fair Value    
Outstanding, beginning balance (in dollars per share) $ 3.38 $ 3.54
Granted (in dollars per share) 3.25  
Vested (in dollars per share) 3.40  
Cancelled (in dollars per share) 3.75  
Outstanding, ending balance (in dollars per share) $ 3.38 $ 3.54