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Sale of Future Revenue (Tables) | 6 Months Ended
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Jun. 30, 2021
Revenue from Contract with Customer [Abstract] |
Royalty Obligation Activity | The following table shows the activity of the liability related to the sale of future for the six months ended June 30, 2021:
Liability related to the sale of future revenue, net at December 31, 2020 | $ | 48,974 |
Royalties related to the sale of future revenue | (1,034) |
Amortization of issuance costs | 71 |
Interest expense related to the sale of future revenue | 6,729 |
Liability related to the sale of future revenue, net (includes current portion of $1,737) | $ | 54,740 |

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