Related Party Transactions (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023	Dec. 31, 2023
Collaboration and licensing agreements
Accounts due from related parties	$ 435		$ 435		$ 2,765
Revenue from contract with customer	2,556	$ 4,866	5,682	$ 17,964
Accrued professional fees and other	1,418		1,418		3,147
Commercial supply revenue
Collaboration and licensing agreements
Revenue from contract with customer		1,252	640	5,843
Collaborative revenue
Collaboration and licensing agreements
Revenue from contract with customer	$ 1,298	2,471	$ 2,086	10,631
Royalty revenue
Collaboration and licensing agreements
Revenue from contract with customer		167		415
Affiliated Entity [Member] | Vifor International Ltd. [Member]
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 [Member] | CSL Vifor [Member]
Collaboration and licensing agreements
Accounts due from related parties	$ 435		$ 435		$ 2,765
Affiliated Entity [Member] | CSL Vifor [Member] | Commercial supply revenue
Collaboration and licensing agreements
Revenue from related parties		1,252	640	5,843
Affiliated Entity [Member] | CSL Vifor [Member] | Other Non-Cash Revenue [Member]
Collaboration and licensing agreements
Revenue from related parties	435	0	1,084	0
Affiliated Entity [Member] | CSL Vifor [Member] | CSL Vifor Profit Sharing [Member] | Collaborative revenue
Collaboration and licensing agreements
Revenue from contract with customer	1,298	1,932	2,086	10,092
Q2 negative profit share for the Company			1,447
Affiliated Entity [Member] | CSL Vifor [Member] | CSL Vifor Kapruvia [Member] | Royalty revenue
Collaboration and licensing agreements
Revenue from contract with customer	$ 0	$ 167	$ 0	$ 415