Astellas Agreements - Summary of Allocation for Transaction Price to the Three Performance Obligations (Details) - Astellas - USD ($) $ in Thousands	1 Months Ended	3 Months Ended
	Oct. 31, 2022	Mar. 31, 2024
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items]
Transaction Price Allocation	$ 36,100	$ 36,059
Option to obtain license for Rett
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items]
Transaction Price Allocation		5,485
Option to obtain license for GAN
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items]
Transaction Price Allocation		2,317
Rett research and development activities
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items]
Transaction Price Allocation		$ 28,257