REVENUE RECOGNITION - Schedule of Net Product 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 net product sales	$ 114,449	$ 54,116	$ 196,180	$ 95,490
Net product sales
Disaggregation of Revenue [Line Items]
Total net product sales	94,842	52,176	170,702	92,160
FILSPARI
Disaggregation of Revenue [Line Items]
Total net product sales	71,887	27,125	127,768	46,959
Tiopronin products
Disaggregation of Revenue [Line Items]
Total net product sales	$ 22,955	$ 25,051	$ 42,934	$ 45,201

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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+ Details

- Definition

Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

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+ Details