Revenue Recognition - Disaggregation of Revenue (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Disaggregation of Revenue [Line Items]
Total revenue	$ 2,556	$ 4,866	$ 5,682	$ 17,964
Collaborative revenue
Disaggregation of Revenue [Line Items]
Total revenue	1,298	2,471	2,086	10,631
Collaborative revenue | Maruishi Agreement [Member]
Disaggregation of Revenue [Line Items]
Total revenue		539		539
Collaborative revenue | Affiliated Entity [Member] | CSL Vifor [Member] | CSL Vifor Profit Sharing [Member]
Disaggregation of Revenue [Line Items]
Total revenue	1,298	1,932	2,086	10,092
Commercial supply revenue
Disaggregation of Revenue [Line Items]
Total revenue		1,252	640	5,843
Commercial supply revenue | Affiliated Entity [Member] | CSL Vifor [Member] | CSL Vifor Korsuva [Member]
Disaggregation of Revenue [Line Items]
Total revenue	0	1,252	640	5,843
License and milestone fees
Disaggregation of Revenue [Line Items]
Total revenue		910		910
License and milestone fees | Maruishi Agreement [Member]
Disaggregation of Revenue [Line Items]
Total revenue		910		910
Royalty revenue
Disaggregation of Revenue [Line Items]
Total revenue		167		415
Royalty revenue | Affiliated Entity [Member] | CSL Vifor [Member] | CSL Vifor Kapruvia [Member]
Disaggregation of Revenue [Line Items]
Total revenue	0	167	0	415
Clinical compound revenue
Disaggregation of Revenue [Line Items]
Total revenue		66	84	165
Clinical compound revenue | Maruishi Agreement [Member]
Disaggregation of Revenue [Line Items]
Total revenue	0	66	84	165
Other revenue (non-cash)
Disaggregation of Revenue [Line Items]
Total revenue	1,258	$ 0	2,872	$ 0
Other revenue (non-cash) | Maruishi Agreement [Member]
Disaggregation of Revenue [Line Items]
Total revenue	823		1,788
Other revenue (non-cash) | Affiliated Entity [Member] | CSL Vifor [Member] | CSL Vifor Kapruvia [Member]
Disaggregation of Revenue [Line Items]
Total revenue	$ 435		$ 1,084