Revenue Recognition - Additional Information (Detail) - USD ($) $ in Thousands	1 Months Ended		3 Months Ended		9 Months Ended
	Apr. 30, 2022	Jan. 31, 2022	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022	Dec. 31, 2022
Collaboration Arrangement [Line Items]
Accounts receivable, net - related party			$ 3,351		$ 3,351		$ 3,260
Total revenue			4,866	$ 10,813	17,964	$ 38,606
Other receivables			1,682		1,682		496
Commercial supply revenue
Collaboration Arrangement [Line Items]
Total revenue			1,252	3,370	5,843	8,160
License and milestone fees
Collaboration Arrangement [Line Items]
Total revenue			910		910	15,000
Royalty revenue
Collaboration Arrangement [Line Items]
Total revenue			167		415
Collaborative revenue
Collaboration Arrangement [Line Items]
Total revenue			2,471	7,443	10,631	15,446
Clinical compound revenue
Collaboration Arrangement [Line Items]
Total revenue			66		165
CSL Vifor, Maruishi and CKDP Agreements [Member]
Collaboration Arrangement [Line Items]
Other contract Assets			0		0		0
Other contract liabilities			0		0		$ 0
Maruishi Agreement [Member]
Collaboration Arrangement [Line Items]
Total revenue			1,449		1,449
Other receivables			1,449		1,449
Maruishi Agreement [Member] | License and milestone fees
Collaboration Arrangement [Line Items]
Total revenue			910	0	910	0
Maruishi Agreement [Member] | Collaborative revenue
Collaboration Arrangement [Line Items]
Total revenue			539	0	539	0
Maruishi Agreement [Member] | Clinical compound revenue
Collaboration Arrangement [Line Items]
Total revenue			66	0	165	0
Affiliated Entity [Member] | CSL Vifor Profit Sharing [Member] | Collaborative revenue
Collaboration Arrangement [Line Items]
Total revenue			1,932	7,443	10,092	15,446
Affiliated Entity [Member] | CSL Vifor Korsuva [Member] | Commercial supply revenue
Collaboration Arrangement [Line Items]
Total revenue			1,252	3,370	5,843	8,160
Affiliated Entity [Member] | CSL Vifor Korsuva [Member] | Commercial Supply Revenue With No Associated Costs Of Goods Sold [Member]
Collaboration Arrangement [Line Items]
Total revenue		$ 2,295
Cost of goods sold		$ 0
Affiliated Entity [Member] | CSL Vifor Korsuva [Member] | Commercial Supply Revenue With Associated Costs Of Goods Sold [Member]
Collaboration Arrangement [Line Items]
Revenue						5,865
Cost of goods sold			1,558	3,055	5,566	5,136
Affiliated Entity [Member] | Vifor Fresenius Medical Care Renal Pharma Ltd Agreement No 2 [Member] | License and milestone fees | Regulatory Milestones [Member]
Collaboration Arrangement [Line Items]
Proceeds from milestone payments	$ 15,000
Affiliated Entity [Member] | Vifor Fresenius Medical Care Renal Pharma Ltd Agreement [Member] | License and milestone fees
Collaboration Arrangement [Line Items]
Total revenue						15,000
Affiliated Entity [Member] | CSL Vifor Kapruvia [Member] | Royalty revenue
Collaboration Arrangement [Line Items]
Total revenue			$ 167	$ 0	$ 415	$ 0