REVENUE - Schedule of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Disaggregation of Revenue [Line Items]
Total revenues	$ 97,662	$ 73,222	$ 171,776	$ 119,245
Product sales, net
Disaggregation of Revenue [Line Items]
Total revenues	$ 90,077	$ 72,591	$ 157,891	$ 116,103
Product sales, net | Gross product revenue | Product Concentration Risk
Disaggregation of Revenue [Line Items]
Product sales, net as a percentage of total revenues	92.20%	99.10%	91.90%	97.40%
IBSRELA
Disaggregation of Revenue [Line Items]
Total revenues	$ 65,045	$ 35,445	$ 109,448	$ 63,806
XPHOZAH
Disaggregation of Revenue [Line Items]
Total revenues	25,032	37,146	48,443	52,297
Product supply revenue
Disaggregation of Revenue [Line Items]
Total revenues	6,185	13	6,439	2,139
Licensing revenue
Disaggregation of Revenue [Line Items]
Total revenues	20	19	5,040	36
Non-cash royalty revenue related to the sale of future royalties
Disaggregation of Revenue [Line Items]
Total revenues	$ 1,380	$ 599	$ 2,406	$ 967