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Liability Related to Sale of Future Royalties (Tables) | 12 Months Ended
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Dec. 31, 2014
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Summary of Liability Related to Potential Future Royalties | The following table shows the activity within the liability account during the year ended December 31, 2014 and for the period from the inception of the royalty transaction on February 24, 2012 (inception) to December 31, 2014 (in thousands):
|  | Year ended December 31, 2014 |  |  | Period from inception to December 31, 2014 |
Liability related to sale of future royalties — beginning balance |  | $ | 128,520 |  |  | $ | — |
Proceeds from sale of future royalties |  |  | — |  |  |  | 124,000 |
Payments from Nektar to RPI |  |  | (7,000 | ) |  |  | (10,000 | )
Non-cash CIMZIA® and MIRCERA® royalty revenue |  |  | (21,937 | ) |  |  | (54,783 | )
Non-cash interest expense recognized |  |  | 20,888 |  |  |  | 61,254 |
Liability related to sale of future royalties — ending balance |  | $ | 120,471 |  |  | $ | 120,471 |

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- Definition Liability related to sale of potential future royalties. + References No definition available. + Details
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