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LICENSE AND COLLABORATION AGREEMENTS (Details) € in Millions, $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2023 USD ($) | Dec. 31, 2023 EUR (€) | Mar. 31, 2019
Merck Serono | Pegvaliase Agreement |  |  |
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items] |  |  |
Business acquisition, cash paid | $ | $ 125.0 |  |
Maximum | Merck Serono | A&R Kuvan Agreement |  |  |
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items] |  |  |
Business acquisition contingent consideration potential cash payments upon achievement of sales milestone | € |  | € 60.0 |
Disposal Group, Disposed of by Sale, Not Discontinued Operations | FIRDAPSE |  |  |
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items] |  |  |
Royalties on net product sales, minimum |  |  | 7.00%
Royalties on net product sales, maximum |  |  | 10.00%

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