LIABILITY RELATED TO SETTLEMENT ROYALTIES, WORKING CAPITAL FUND LIABILITY AND LIABILITY RELATED TO SALE OF FUTURE ROYALTIES - Narrative (Details) - USD ($) $ / shares in Units, $ in Thousands		1 Months Ended		3 Months Ended		9 Months Ended
	Feb. 25, 2021	Feb. 28, 2022	May 31, 2017	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023	May 31, 2028	May 31, 2027	May 31, 2026	Jul. 01, 2025	Jul. 10, 2024	May 03, 2024	Dec. 31, 2023	Mar. 18, 2022	Feb. 18, 2022
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Common stock, issued (in shares)				211,542,122		211,542,122								194,582,539
Long-term deferred revenue				$ 0		$ 0								$ 43,296
Annual effective interest rate				0.00%		0.00%
Interest expense				$ (6,661)	$ (1,410)	$ (11,308)	$ (4,614)
Refund liability to customer, amortization of discount				1,100	700	2,700	2,400
Refund liability to customer, amortization of deferred gain				900	1,000	2,600	3,000
Working Capital Fund liability				40,203		40,203								40,093
Maximum annual royalty payout capacity	$ 13,000
Percentage of royalty payment to be received once maximum annual royalty payout has been paid	85.00%
Maximum aggregate royalty payout capacity	$ 150,000
Liability related to sale of future royalties, net of current portion	$ 44,800			$ 52,381		$ 52,381								$ 54,013
Private Placement
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Sale of stock, price per share (in dollars per share)		$ 5.00
Number of shares sold in offering (in shares)		4,000,000
Aggregate net proceeds from offering		$ 20,000
Vifor (International) Ltd.
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Annual effective interest rate				41.00%		41.00%
Interest expense				$ 4,400		$ 4,400
Refund liability to customer, gross															$ 40,000
Working Capital Fund liability				40,200		40,200
Vifor (International) Ltd. | License Agreement
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Common stock, issued (in shares)			3,571,429
Sale of stock, price per share (in dollars per share)			$ 14.00
Proceeds from common stock sold			$ 50,000
Vifor (International) Ltd. | License
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Revenue, remaining performance obligation, profit share percentage																66.00%
Deferred revenue																$ 25,000
Long-term deferred revenue		$ 13,600	$ 4,700
Transaction price				47,700		47,700										$ 43,300
Refund liability to customer, interest rate															15.00%
Vifor (International) Ltd. | License | Private Placement
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Long-term deferred revenue				18,300		18,300
CSL Vifor
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Tiered royalty payments as a percentage of net sales												$ 450,000
Refund liability to customer, interest rate													15.00%
CSL Vifor | Forecast
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Royalty payments											$ 40,000
Royalty true-up payments								$ 40,000	$ 20,000	$ 10,000
CSL Vifor | Maximum
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Tiered royalty payments as a percentage of net sales												$ 450,000
Tiered royalty payments, percentage													14.00%
CSL Vifor | Minimum
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Tiered royalty payments, percentage													8.00%
Vifor International Limited, First Investment | License
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Long-term deferred revenue				4,700		4,700
Vifor International Limited, Second Investment | License
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Long-term deferred revenue				13,600		13,600
HealthCare Royalty Partners IV, L.P.
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Payments for royalties				$ 500	$ 500	$ 1,400	$ 1,500