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Revenue (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2023 | Jun. 30, 2022 | Jun. 30, 2023 | Jun. 30, 2022 | Dec. 31, 2022
Revenue |  |  |  |  |
Revenues | $ 268 | $ 163 | $ 1,234 | $ 337 |
Contract assets | 0 |  | 0 |  | $ 0
Contract liability | 48 |  | 48 |  | $ 60
Revenue, contract liabilities |  |  | 100 |  |
Maximum |  |  |  |  |
Revenue |  |  |  |  |
Contract liability | 100 |  | 100 |  |
Contracts and grants |  |  |  |  |
Revenue |  |  |  |  |
Revenues | 252 | 163 | 1,218 | 307 |
Rockefeller University | Contracts and grants |  |  |  |  |
Revenue |  |  |  |  |
Revenues | $ 200 | $ 100 | $ 1,200 | $ 200 |

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