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LICENSE AND COLLABORATION AGREEMENTS	12 Months Ended
LICENSE AND COLLABORATION AGREEMENTS	Dec. 31, 2024
Organization, Consolidation and Presentation of Financial Statements [Abstract]
LICENSE AND COLLABORATION AGREEMENTS	LICENSE AND COLLABORATION AGREEMENTS In October 2012, the Company licensed to Catalyst Pharmaceutical Partners, Inc. (Catalyst) the North American rights to develop and market FIRDAPSE, the Company's former commercial product for the treatment of Lambert-Eaton myasthenic syndrome. In exchange for the North American rights to FIRDAPSE, commencing in the first quarter of 2019 the Company receives royalties of 7% to 10% on net product sales of FIRDAPSE in North America. On October 1, 2015, the Company entered into an agreement with Ares Trading S.A. (Merck Serono) under which the Company acquired all global rights to KUVAN and PALYNZIQ from Merck Serono, with the exception of KUVAN in Japan. Previously, the Company had exclusive rights to KUVAN in the U.S. and Canada and PALYNZIQ in the U.S. and Japan. Pursuant to the agreement, if future sales milestones were met, the Company was obligated to pay Merck Serono up to a maximum of €60.0 million, all of which were met and paid as of December 31, 2023. Pursuant to the agreement, the Company also paid Merck Serono €125.0 million in cash when the PALYNZIQ development milestones were achieved. The Company is engaged in R&D collaborations with various other entities. These provide for sponsorship of R&D by the Company and may also provide for exclusive royalty-bearing intellectual property licenses or rights of first negotiation regarding licenses to intellectual property development under the collaborations. Typically, these agreements can be terminated for cause by either party upon written notice.