Product Revenues, Net, Accounts Receivable, Net and Reserves for Product Revenues - Summary of Product Revenues (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Product Information [Line Items]
Products, net	$ 359,484	$ 231,495
PMO Products [Member]
Product Information [Line Items]
Products, net	225,548	231,495
PMO Products [Member] | United States [Member]
Product Information [Line Items]
Products, net	189,667	200,451
PMO Products [Member] | Rest Of World [Member]
Product Information [Line Items]
Products, net	35,881	31,044
ELEVIDYS [Member]
Product Information [Line Items]
Products, net	133,936	0
ELEVIDYS [Member] | United States [Member]
Product Information [Line Items]
Products, net	$ 133,936	$ 0