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Severance (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Jul. 31, 2023
Severance          
Percentage of reduction in headcount         26.00%
Accrued expenses and other current liabilities | Employee Severance [Member]          
Severance          
Unpaid severance and termination-related expenses recognized $ 0.4   $ 0.4    
General and administrative | Employee Severance [Member]          
Severance          
Severance and termination-related expenses 1.0 $ 0.0 1.0 $ 1.8  
Research and development | Employee Severance [Member]          
Severance          
Severance and termination-related expenses $ 1.4   $ 1.4 $ 0.9