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Stock-based compensation - Schedule of Stock-Based Compensation Expense as Reflected in the Company's Condensed Consolidated Statements of Operations and Comprehensive Loss (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Stock options        
Share-based compensation expense $ 5,375 $ 4,928 $ 16,208 $ 13,549
Research and development        
Stock options        
Share-based compensation expense 2,890 2,607 8,569 7,410
General and administrative        
Stock options        
Share-based compensation expense $ 2,485 $ 2,321 $ 7,639 $ 6,139