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Related party transactions (Details) - USD ($)	3 Months Ended		6 Months Ended
Related party transactions (Details) - USD ($)	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023	Dec. 31, 2023
Related party transactions
Related party collaboration receivable	$ 1,549,000		$ 1,549,000		$ 3,341,000
Dr. Sah \| Related Party
Related party transactions
Total amount of services received	150,000	$ 184,000	300,000	$ 383,800
Advisory fee amount per month		$ 50,000		$ 50,000
Neurocrine Collaborative Agreement 2019
Related party transactions
Related party collaboration receivable	700,000		700,000
Neurocrine Collaborative Agreement 2023
Related party transactions
Related party collaboration receivable	$ 900,000		$ 900,000