Income taxes - Change in Valuation Allowance (Details) - USD ($) $ in Thousands |
12 Months Ended | |
|---|---|---|
Dec. 31, 2024 |
Dec. 31, 2023 |
|
| Valuation allowance, beginning | $ 294,920 | $ 160,512 |
| Foreign currency translation adjustments | (2,207) | 7,080 |
| Net change in the valuation allowance | 14,568 | 134,408 |
| Valuation allowance, ending | 309,488 | 294,920 |
| Net loss | ||
| Increase in valuation allowance | 14,321 | 21,076 |
| Other Comprehensive Income (Loss) [Member] | ||
| Increase in valuation allowance | $ 2,454 | (8,042) |
| TCR Therapeutics Inc. | ||
| Increase in valuation allowance | $ 114,294 | |
| X | ||||||||||
- Definition Amount of decrease in the valuation allowance for a foreign currency translation adjustments, deferred tax asset. No definition available.
|
| X | ||||||||||
- Definition Amount of increase in the valuation allowance for a specified deferred tax asset. No definition available.
|
| X | ||||||||||
- Definition Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
|
| X | ||||||||||
- Definition Amount of increase (decrease) in the valuation allowance for a specified deferred tax asset. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
|
| X | ||||||||||
- Details
|
| X | ||||||||||
- Details
|
| X | ||||||||||
- Details
|