Collaboration and Licensing Agreements - Additional Information (Detail) - USD ($) $ in Thousands	1 Months Ended
	Oct. 31, 2020	May 31, 2018	May 17, 2018
Vifor Fresenius Medical Care Renal Pharma Ltd Agreement No 1 [Member]
Collaboration and Licensing Agreements:
Percentage of net profit sharing	60.00%
Vifor Fresenius Medical Care Renal Pharma Ltd Agreement No 2 [Member]
Collaboration and Licensing Agreements:
Percentage of net profit sharing		50.00%
CSL Vifor Maximum [Member] | Vifor Fresenius Medical Care Renal Pharma Ltd Agreement No 1 [Member]
Collaboration and Licensing Agreements:
Potential sales-based milestone payments	$ 240,000
Affiliated Entity | CSL Vifor | Vifor Fresenius Medical Care Renal Pharma Ltd Agreement No 1 [Member]
Collaboration and Licensing Agreements:
Percentage of net profit sharing	40.00%
Affiliated Entity | Vifor Fresenius Medical Care Renal Pharma Ltd | Maximum [Member] | Vifor Fresenius Medical Care Renal Pharma Ltd Agreement No 2 [Member]
Collaboration and Licensing Agreements:
Potential milestone payments			$ 440,000