Revenue Recognition - Schedule of net revenue from collaboration arrangement (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Revenue Recognition and Collaboration Arrangements
Total net royalty revenue	$ 77,499	$ 76,372
Royalty revenue
Revenue Recognition and Collaboration Arrangements
Total net royalty revenue	58,415	56,858
GSK
Revenue Recognition and Collaboration Arrangements
Total net royalty revenue	58,415	56,858
GSK | Royalty revenue
Revenue Recognition and Collaboration Arrangements
Royalties	61,871	60,314
Less: amortization of capitalized fees paid to a related party	(3,456)	(3,456)
GSK | RELVAR/BREO
Revenue Recognition and Collaboration Arrangements
Royalties	52,138	50,883
GSK | ANORO
Revenue Recognition and Collaboration Arrangements
Royalties	$ 9,733	$ 9,431