Income taxes - Cash paid for income taxes, net of refunds received (Details) $ in Thousands |
12 Months Ended |
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Dec. 31, 2025
USD ($)
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| Income taxes | |
| Subtotal | $ 15 |
| Total | $ 15 |
| Income Tax Paid, after Refund Received, Foreign Jurisdiction [Extensible Enumeration] | Foreign Tax Jurisdiction, Other [Member] |
| Effective Income Tax Rate Reconciliation, State and Local Jurisdiction, Contribution Greater than 50 Percent, Tax Effect [Extensible Enumeration] | Massachusetts |
| Massachusetts | |
| Income taxes | |
| U.S. state and local | $ 13 |
| California | |
| Income taxes | |
| U.S. state and local | 1 |
| Other | |
| Income taxes | |
| U.S. state and local | $ 1 |
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- Definition Indicates name of state or local jurisdiction that makes up greater than 50 percent of effect of state and local income tax. Reference 1: http://www.xbrl.org/2003/role/exampleRef
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- Definition Indicates foreign jurisdiction to which income tax is paid, after refund received. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition Amount, after income tax refund received, of cash paid to state and local tax jurisdictions for tax on income. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition Amount, after refund, of cash paid to foreign, federal, state, and local jurisdictions as income tax. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition Amount, after refund, of cash paid to federal, state, and local jurisdictions as income tax. No definition available.
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