Revenue Recognition - Disaggregation of Revenue (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Disaggregation of Revenue [Line Items]
Total revenue	$ 991	$ 6,933	$ 3,126	$ 13,098
Other revenue (non-cash)
Disaggregation of Revenue [Line Items]
Total revenue	991	0	1,614	0
Other revenue (non-cash) | Maruishi Agreement [Member]
Disaggregation of Revenue [Line Items]
Total revenue	632		965
Other revenue (non-cash) | Affiliated Entity [Member] | CSL Vifor | CSL Vifor Kapruvia [Member]
Disaggregation of Revenue [Line Items]
Total revenue	359		649
Collaborative revenue
Disaggregation of Revenue [Line Items]
Total revenue		5,410	788	8,160
Collaborative revenue | Affiliated Entity [Member] | CSL Vifor | CSL Vifor Profit Sharing
Disaggregation of Revenue [Line Items]
Total revenue		5,410	788	8,160
Commercial supply revenue
Disaggregation of Revenue [Line Items]
Total revenue		1,400	640	4,591
Commercial supply revenue | Affiliated Entity [Member] | CSL Vifor | CSL Vifor Korsuva [Member]
Disaggregation of Revenue [Line Items]
Total revenue	0	1,400	640	4,591
Clinical compound revenue
Disaggregation of Revenue [Line Items]
Total revenue			84	99
Clinical compound revenue | Maruishi Agreement [Member]
Disaggregation of Revenue [Line Items]
Total revenue	0	0	84	99
Royalty revenue
Disaggregation of Revenue [Line Items]
Total revenue		123		248
Royalty revenue | Affiliated Entity [Member] | CSL Vifor | CSL Vifor Kapruvia [Member]
Disaggregation of Revenue [Line Items]
Total revenue	$ 0	$ 123	$ 0	$ 248