Segment data - Schedule of Company's reportable segment net revenues and loss (Details) - USD ($) $ in Thousands |
3 Months Ended | 9 Months Ended | 12 Months Ended | ||||||
|---|---|---|---|---|---|---|---|---|---|
Sep. 30, 2026 |
Jun. 30, 2026 |
Mar. 31, 2026 |
Sep. 30, 2025 |
Jun. 30, 2025 |
Mar. 31, 2025 |
Sep. 30, 2026 |
Sep. 30, 2025 |
Dec. 31, 2025 |
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| Revenue: | |||||||||
| Collaboration Revenue | $ 54,366 | $ 12,768 | $ 67,544 | $ 120,891 | |||||
| External research and development expenses: | |||||||||
| Other development and discovery programs | 12,405 | 6,288 | 35,113 | 17,216 | |||||
| Research and development personnel expense | 13,827 | 10,889 | 41,221 | 33,999 | |||||
| Overhead and administrative expense | 10,563 | 8,574 | 31,125 | 24,653 | |||||
| General and administrative expenses: | |||||||||
| General and administrative expenses personnel expense | 6,947 | 5,696 | 20,016 | 16,854 | |||||
| Professional services | 2,513 | 1,619 | 6,358 | 4,147 | |||||
| Facility costs and other expense | 1,482 | 1,750 | 4,877 | 4,862 | |||||
| Other income (expense): | |||||||||
| Interest and other income, net | 5,718 | 2,717 | 17,242 | 10,846 | |||||
| Income tax (provision) benefit | (716) | 3,177 | (976) | 1,156 | |||||
| Net income (loss) | 3,063 | $ (43,397) | $ (44,503) | (27,081) | $ (12,295) | $ 46,885 | (84,837) | 7,509 | $ (38,600) |
| MRT-2359 | |||||||||
| External research and development expenses: | |||||||||
| External research and development expenses | 2,633 | 2,176 | 8,534 | 6,363 | |||||
| MRT-6160 | |||||||||
| External research and development expenses: | |||||||||
| External research and development expenses | 299 | 1,444 | 326 | 6,902 | |||||
| MRT-8102 | |||||||||
| External research and development expenses: | |||||||||
| External research and development expenses | $ 5,636 | $ 7,307 | $ 21,077 | $ 10,388 | |||||
| X | ||||||||||
- Definition External Research and Development Expense No definition available.
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- Definition External Research and Development Expenses [Abstract] No definition available.
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- Definition Facility Costs and Other Expenses No definition available.
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- Definition General and Administrative Expenses Personnel Expense No definition available.
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- Definition Research and Development Personnel Expense No definition available.
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- Definition Amount of expense for administrative fee from service provided, including, but not limited to, salary, rent, or overhead cost. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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- References No definition available.
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- Definition Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition The portion of profit or loss for the period, net of income taxes, which is attributable to the parent. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition The aggregate amount of income or expense from ancillary business-related activities (that is to say, excluding major activities considered part of the normal operations of the business). Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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- References No definition available.
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- Definition Amount of other research and development expense. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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- Definition Amount of expense for professional and contracted services. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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- Definition Amount, including tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value-added and excise. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- References No definition available.
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