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Related party transactions (Details)
3 Months Ended 9 Months Ended
Sep. 30, 2022
USD ($)
individual
Sep. 30, 2021
USD ($)
Sep. 30, 2022
USD ($)
individual
Sep. 30, 2021
USD ($)
Dec. 31, 2021
USD ($)
Related party transactions          
Related party collaboration receivable $ 225,000   $ 225,000   $ 732,000
Dr. Sah | Board and scientific advisory services          
Related party transactions          
Number of individuals providing services | individual 1   1    
Total amount of services received $ 93,600 $ 30,000 $ 185,925 $ 120,000  
Dr. Sandrock | Consulting and advisor services          
Related party transactions          
Total amount of services received     60,000    
Neurocrine | Collaboration arrangement          
Related party transactions          
Related party collaboration receivable $ 200,000   $ 200,000