Related Party Transactions (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023	Dec. 31, 2023
Collaboration and licensing agreements
Accounts due from related parties	$ 359		$ 359		$ 2,765
Revenue from contract with customer	991	$ 6,933	3,126	$ 13,098
Accrued professional fees and other	$ 4,754		4,754		3,147
Commercial supply revenue
Collaboration and licensing agreements
Revenue from contract with customer		1,400	640	4,591
Collaborative revenue
Collaboration and licensing agreements
Revenue from contract with customer		5,410	$ 788	8,160
Royalty revenue
Collaboration and licensing agreements
Revenue from contract with customer		123		248
Affiliated Entity | Vifor International Ltd.
Collaboration and licensing agreements
Shares owned as a result of upfront and milestone payments	7,396,770		7,396,770
Related party ownership percentage	13.50%		13.50%
Affiliated Entity | CSL Vifor
Collaboration and licensing agreements
Accounts due from related parties	$ 359		$ 359		$ 2,765
Affiliated Entity | CSL Vifor | Commercial supply revenue
Collaboration and licensing agreements
Revenue from related parties		1,400	640	4,591
Affiliated Entity | CSL Vifor | Other Non-Cash Revenue
Collaboration and licensing agreements
Revenue from related parties	359	0	649	0
Affiliated Entity | CSL Vifor | CSL Vifor Profit Sharing | Collaborative revenue
Collaboration and licensing agreements
Revenue from contract with customer		5,410	788	8,160
Accrued professional fees and other	1,447		1,447
Affiliated Entity | CSL Vifor | CSL Vifor Kapruvia | Royalty revenue
Collaboration and licensing agreements
Revenue from contract with customer	$ 0	$ 123	$ 0	$ 248