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Related party transactions (Details) - USD ($)	3 Months Ended		9 Months Ended
Related party transactions (Details) - USD ($)	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023	Dec. 31, 2023	Jun. 30, 2023
Related party transactions
Related party collaboration receivable	$ 3,714,000		$ 3,714,000		$ 3,341,000
Dr. Sah \| Related Party
Related party transactions
Total amount of services received	150,000	$ 157,500	450,000	$ 541,300
Advisory fee amount per month						$ 50,000
Neurocrine Collaborative Agreement 2019
Related party transactions
Related party collaboration receivable	400,000		400,000
Neurocrine Collaborative Agreement 2023
Related party transactions
Related party collaboration receivable	$ 3,300,000		$ 3,300,000