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Liabilities Related to the Sales of Future Royalties (Tables) | 12 Months Ended
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Dec. 31, 2021
Liability Related To Sale Of Potential Future Royalties [Abstract] |
Schedule of Liability Related to Potential Future Royalties | The following table shows the activity within the liability account of each arrangement (in thousands):
| Year-Ended December 31, 2021 |  | Period from inception to December 31, 2021
| 2012 Purchase and Sale Agreement |  | 2020 Purchase and Sale Agreement |  | Total |  | 2012 Purchase and Sale Agreement |  | 2020 Purchase and Sale Agreement |  | Total
Liabilities related to the sales of future royalties—beginning balance | $ | 65,880 |  |  | $ | 139,375 |  |  | $ | 205,255 |  |  | $ | — |  |  | $ | — |  |  | $ | — |
Royalty monetization proceeds | — |  |  | — |  |  | — |  |  | 124,000 |  |  | 150,000 |  |  | 274,000 |
Non-cash royalty revenue | (37,578) |  |  | (40,168) |  |  | (77,746) |  |  | (282,658) |  |  | (50,793) |  |  | (333,451) |
Non-cash interest expense | 26,458 |  |  | 20,855 |  |  | 47,313 |  |  | 223,418 |  |  | 20,855 |  |  | 244,273 |
Payments to RPI | — |  |  | — |  |  | — |  |  | (10,000) |  |  | — |  |  | (10,000) |
Loss on revaluation of liability related to the sale of future royalties | 23,522 |  |  |  |  | 23,522 |  |  | 23,522 |  |  | — |  |  | 23,522 |
Liabilities related to the sales of future royalties – ending balance | 78,282 |  |  | 120,062 |  |  | 198,344 |  |  | 78,282 |  |  | 120,062 |  |  | 198,344 |
Less: unamortized transaction costs | — |  |  | (2,917) |  |  | (2,917) |  |  | — |  |  | (2,917) |  |  | (2,917) |
Liabilities related to the sales of future royalties, net | $ | 78,282 |  |  | $ | 117,145 |  |  | $ | 195,427 |  |  | $ | 78,282 |  |  | $ | 117,145 |  |  | $ | 195,427 |

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- Definition Schedule Of Liability Related To Sale Of Potential Future Royalties + References No definition available. + Details
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