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LIABILITY RELATED TO THE SALE OF FUTURE ROYALTIES (Tables)
 9 Months Ended
Sep. 30, 2020
Related Party Transactions [Abstract]  
Schedule of Royalty Liability
The following table shows the activity with respect to the liability related to the sale of future royalties, in thousands:
Liability related to the sale of future royalties as of April 10, 2020$1,000,000 
Capitalized closing costs(12,955)
Interest expense recognized55,979 
Carrying value of liability related to sale of future royalties as of September 30, 2020
$1,043,024