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Accrued Expenses - Narrative (Details) - USD ($)
$ in Thousands
Jun. 30, 2023
Dec. 31, 2022
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]    
Accrued milestone expense $ 6,937 $ 0
Ionis    
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]    
Accrued milestone expense $ 6,900