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Liability Related to Sale of Future Royalties (Tables) | 12 Months Ended
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Dec. 31, 2013
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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, 2013 and for the period from the inception of the royalty transaction on February 24, 2012 (inception) to December 31, 2013 (in thousands):
|  | Year ended December 31, 2013 |  |  | Period from inception to December 31, 2013 |
Liability related to sale of future royalties—beginning balance |  | $ | 131,266 |  |  | $ | — |
Proceeds from sale of future royalties |  |  | — |  |  |  | 124,000 |
Non-cash interest expense recognized |  |  | 22,309 |  |  |  | 40,366 |
Non-cash CIMZIA® and MIRCERA® royalty revenue |  |  | (22,055 | ) |  |  | (32,846 | )
Payments from Nektar to RPI |  |  | (3,000 | ) |  |  | (3,000 | )
Total liability related to sale of future royalties as of December 31, 2013 |  |  | 128,520 |  |  |  | 128,520 |
Less: current portion |  |  | (7,000 | ) |  |  | (7,000 | )
Liability related to sale of future royalties, less current portion |  | $ | 121,520 |  |  | $ | 121,520 |

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