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Revenue - Revenue from contracts with customers (Details) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2024 USD ($) contract | Mar. 31, 2023 USD ($) customer | Dec. 31, 2023 USD ($)
Revenue |  |  |
Number of customers | customer |  | 2 |
Revenue | $ 5,678,000 | $ 47,601,000 |
Number of contracts with customers | contract | 2 |  |
Deferred revenue decrease |  |  | $ 856,000
Deferred revenue | $ 178,889,000 |  | $ 178,033,000
Amount of increase in deferred income caused by the change in the exchange rate | $ 1,507,000 |  |
Exchange rate | 1.26 |  | 1.27
Milestone payment met and accrued | $ 7,574,000 |  |
Aggregate amount of the transaction price that is allocated to performance obligations that are unsatisfied or partially satisfied under the agreements | 305,509,000 |  |
Revenue recognized in the period | 5,678,000 |  |
Development revenue |  |  |
Revenue |  |  |
Revenue | $ 5,678,000 | $ 47,601,000 |

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