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Liability Related to the Sale of Future Royalties (Tables)
12 Months Ended
Dec. 31, 2021
Deferred Revenue Disclosure [Abstract]  
Schedule of Activity Within Liability Related to Sale of Future Royalties

The following table shows the activity within the liability account (in thousands):

 

Liability related to the sale
of future royalties

 

December 31, 2019

$

315,369

 

Non-cash collaboration royalty revenue

 

(12,995

)

Non-cash interest expense

 

33,291

 

December 31, 2020

 

335,665

 

Non-cash collaboration royalty revenue

 

(17,951

)

Non-cash interest expense

 

34,072

 

December 31, 2021

$

351,786