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Revenue (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2020 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Revenue |  |  |  |
Revenues |  | $ 2,357 | $ 4,651 | $ 7,418
Contract assets |  | 0 | 0 |
Contract liability |  | 60 | 433 |
Revenue, contract liabilities |  | 400 |  |
Contracts and grants |  |  |  |
Revenue |  |  |  |
Revenues |  | 2,301 | 4,620 | 5,117
Product development and licensing agreements |  |  |  |
Revenue |  |  |  |
Revenues |  | 56 | 31 | 2,301
Rockefeller | Contracts and grants |  |  |  |
Revenue |  |  |  |
Revenues |  | 1,800 | 4,100 | 4,500
Rockefeller | Product development and licensing agreements |  |  |  |
Revenue |  |  |  |
Revenues | $ 1,800 |  |  |
National Institute of Health | Contracts and grants |  |  |  |
Revenue |  |  |  |
Revenues |  | $ 500 | $ 400 | $ 400

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