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Liability Related to Sale of Future Royalties (Tables)
 3 Months Ended
Mar. 31, 2020
Debt Disclosure [Abstract]  
Schedule of liability for sale of future royalties
The following table shows the activity within the liability account for the three months ended March 31, 2020 and 2019, respectively, related to the Funding Agreement.
Three Months Ended March 31,
20202019
Liability related to sale of future royalties - beginning balance
$144,111  $117,515  
Royalty revenues payable to RPI(24) —  
Non-cash interest expense on liability related to sale of future royalties8,425  6,817  
Liability related to sale of future royalties - ending balance
$152,512  $124,332