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Liability Related to the Sale of Future Royalties (Tables) | 12 Months Ended
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Dec. 31, 2019
Liability Related To Sale Of Potential Future Royalties [Abstract] |
Summary of Liability Related to Potential Future Royalties | The following table shows the activity within the liability account during the year ended December 31, 2019 and for the period from the inception of the royalty transaction on February 24, 2012 (inception) to December 31, 2019 (in thousands):
| Year ended December 31, 2019 |  | Period from inception to December 31, 2019
Liability related to the sale of future royalties—beginning balance | $ | 84,810 |  |  | $ | — |
Proceeds from sale of future royalties | — |  |  | 124,000 |
Payments from Nektar to RPI | — |  |  | (10,000 | )
Non-cash CIMZIA® and MIRCERA® royalty revenue | (36,303 | ) |  | (207,142 | )
Non-cash interest expense recognized | 25,044 |  |  | 166,693 |
Liability related to the sale of future royalties – ending balance | 73,551 |  |  | 73,551 |
Less: unamortized transaction costs | (1,531 | ) |  | (1,531 | )
Liability related to the sale of future royalties, net | $ | 72,020 |  |  | $ | 72,020 |

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