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LIABILITY RELATED TO SALE OF FUTURE ROYALTIES (Tables)
 9 Months Ended
Sep. 30, 2023
Other Liabilities Disclosure [Abstract]  
Activity within Liability Related to Sale of Future Royalties, net
The activity within the long-term liability account for the nine months ended September 30, 2023 is as follows (in thousands):
Liability related to sale of future royalties, beginning balance at December 31, 2022$57,484 
MTPC royalties payable(1,423)
Liability related to sale of future royalties, ending balance at September 30, 2023$56,061