DEFERRED REVENUE, REFUND LIABILITY AND LIABILITY RELATED TO SALE OF FUTURE ROYALTIES - Narrative (Details) $ / shares in Units, $ in Thousands		1 Months Ended		3 Months Ended		6 Months Ended
	Feb. 25, 2021 USD ($)	Feb. 28, 2022 USD ($) $ / shares shares	May 31, 2017 USD ($) $ / shares shares	Jun. 30, 2024 USD ($) shares	Jun. 30, 2023 USD ($)	Jun. 30, 2024 USD ($) performance_obligation shares	Jun. 30, 2023 USD ($)	May 31, 2028 USD ($)	May 31, 2027 USD ($)	May 31, 2026 USD ($)	Jul. 01, 2025 USD ($)	May 03, 2024 USD ($)	Dec. 31, 2023 USD ($) shares	Mar. 18, 2022 USD ($)	Feb. 18, 2022 USD ($)
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Deferred revenue				$ 43,296		$ 43,296
Common stock, issued (in shares) | shares				209,929,145		209,929,145							194,582,539
Deferred revenue, net of current portion				$ 0		$ 0							$ 43,296
Refund liability to customer, amortization of discount				900	$ 900	1,600	$ 1,700
Refund liability to customer, amortization of deferred gain				800	1,000	1,700	2,000
Refund liability to customer				40,018		40,018							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			$ 53,101		$ 53,101							$ 54,013
Annual effective interest rate				0.00%		0.00%
Private Placement
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Sale of stock, price per share (in dollars per share) | $ / shares		$ 5.00
Number of shares sold in offering (in shares) | shares		4,000,000
Aggregate net proceeds from offering		$ 20,000
Vifor (International) Ltd.
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Deferred revenue				$ 43,296		$ 43,296
Deferred revenue, net of current portion				0		0
Refund liability to customer, gross														$ 40,000
Refund liability to customer				40,000		40,000
Vifor (International) Ltd. | License Agreement
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Common stock, issued (in shares) | shares			3,571,429
Sale of stock, price per share (in dollars per share) | $ / shares			$ 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
Deferred revenue, net of current portion		$ 13,600	$ 4,700	43,300		$ 43,300
Number of performance obligations | performance_obligation						1
Transaction price															$ 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]
Deferred revenue, net of current portion				18,300		$ 18,300
Vifor International Limited, First Investment | License
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Deferred revenue, net of current portion				4,700		4,700
Vifor International Limited, Second Investment | License
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Deferred revenue, net of current portion				13,600		13,600
CSL Vifor
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Refund liability to customer, interest rate												15.00%
Royalty payments												$ 40,000
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 | Minimum
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Tiered royalty payments, percentage												8.00%
CSL Vifor | Maximum
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Tiered royalty payments, percentage												14.00%
HealthCare Royalty Partners IV, L.P.
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Payments for royalties				$ 400	$ 400	$ 900	$ 1,000