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Business combinations (Details) - USD ($) | Jun. 01, 2023 | May 31, 2023 | Mar. 31, 2024 | Dec. 31, 2023
--- | --- | --- | --- | ---
Assets acquired |  |  |  |
Operating lease right-of-use assets |  |  | $ 19,434,000 | $ 20,762,000
Liabilities assumed |  |  |  |
Operating lease liabilities, current |  |  | (5,250,000) | (5,384,000)
Operating lease liabilities, non-current |  |  | $ (18,442,000) | $ (19,851,000)
TCR2 Therapeutics |  |  |  |
Merger with TCR2 Therapeutics Inc. |  |  |  |
Percentage held following the transaction | 25.00% |  |  |
Adaptimmune |  |  |  |
Merger with TCR2 Therapeutics Inc. |  |  |  |
Percentage held following the transaction | 75.00% |  |  |
TCR2 Therapeutics |  |  |  |
Merger with TCR2 Therapeutics Inc. |  |  |  |
Shares issued | 357,429,306 | 357,429,306 |  |
Percentage of ownership | 100.00% |  |  |
Market price |  | $ 1.02 |  |
Ordinary share price per share |  | $ 0.17 |  |
Intangible assets relation to lease contracts acquired | $ 0 |  |  |
Consideration transferred: |  |  |  |
Fair value of shares issued | 60,763,000 | $ 60,763,000 |  |
Fair value of replacement share options issued | 963,000 |  |  |
Purchase consideration | 61,726,000 |  |  |
Assets acquired |  |  |  |
Cash and cash equivalents | 43,610,000 |  |  |
Restricted cash | 1,654,000 |  |  |
Marketable securities - available-for-sale debt securities | 39,532,000 |  |  |
Other current assets and prepaid expenses | 6,029,000 |  |  |
Property, plant and equipment | 2,712,000 |  |  |
Operating lease right-of-use assets | 5,145,000 |  |  |
Intangible assets | 58,000 |  |  |
Total assets acquired | 98,740,000 |  |  |
Liabilities assumed |  |  |  |
Accounts payable | (6,210,000) |  |  |
Accrued expenses and other current liabilities | (4,537,000) |  |  |
Operating lease liabilities, current | (1,974,000) |  |  |
Operating lease liabilities, non-current | (2,244,000) |  |  |
Total liabilities assumed | (14,965,000) |  |  |
Net assets acquired and liabilities assumed | $ 83,775,000 |  |  |

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