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Liability Related to Sale of Future Royalties (Tables)
 6 Months Ended
Jun. 30, 2020
Debt Disclosure [Abstract]  
Schedule of liability for sale of future royalties
The following table shows the activity within the liability account for the six months ended June 30, 2020 and 2019, respectively, related to the 2018 RPI Funding Agreement.
Six Months Ended June 30,
20202019
Liability related to sale of future royalties - beginning balance
$144,111  $117,515  
Royalty revenues payable to RPI(228) —  
Non-cash interest expense on liability related to sale of future royalties19,995  11,972  
Liability related to sale of future royalties - ending balance
$163,878  $129,487