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Trade Receivables (Tables) | 6 Months Ended
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Jun. 30, 2022
Receivables [Abstract] |
Summary of Receivables | Receivables from collaborations were as follows (in thousands):
| June 30, 2022
| Billed |  | Unbilled |  | Total
U.S. Department of Health and Human Services | $ | — |  |  | $ | 1,303 |  |  | $ | 1,303 |
Royalty receivables from partners | 540 |  |  | — |  |  | 540 |
Total receivables | $ | 540 |  |  | $ | 1,303 |  |  | $ | 1,843 |
| December 31, 2021
| Billed |  | Unbilled |  | Total
U.S. Department of Health and Human Services | $ | 5 |  |  | $ | 1,670 |  |  | $ | 1,675 |
Royalty receivables from partners | 305 |  |  | — |  |  | 305 |
Total receivables | $ | 310 |  |  | $ | 1,670 |  |  | $ | 1,980 |

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- References No definition available. + Details
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