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Investments in marketable securities - Marketable Securities (Details) - USD ($) $ in Thousands | Sep. 30, 2025 | Dec. 31, 2024
--- | --- | ---
Cash and Cash Equivalents [Abstract] |  |
Cash Equivalents, at Carrying Value | $ 7,838 | $ 29,533
Cash Equivalents, Fair Value Disclosure | 7,838 | 29,533
Debt Securities, Available-for-Sale [Abstract] |  |
Amortized Cost | 71,237 | 86,243
Gross Unrealized Gain | 61 | 56
Gross Unrealized Loss | (4) | (6)
Fair Value | 71,294 | 86,293
Short Term Marketable Securities |  |
Debt Securities, Available-for-Sale [Abstract] |  |
Fair Value | 71,300 | 86,300
Money market funds |  |
Cash and Cash Equivalents [Abstract] |  |
Money Market Funds, at Carrying Value | 7,838 | 29,533
US corporate bonds |  |
Debt Securities, Available-for-Sale [Abstract] |  |
Amortized Cost | 3,059 | 30,776
Gross Unrealized Gain | 3 | 27
Gross Unrealized Loss | 0 | (6)
Fair Value | 3,062 | 30,797
US treasury bills |  |
Debt Securities, Available-for-Sale [Abstract] |  |
Amortized Cost | 37,981 | 55,467
Gross Unrealized Gain | 31 | 29
Gross Unrealized Loss | (1) | 0
Fair Value | 38,011 | $ 55,496
US government bonds | Short Term Marketable Securities |  |
Debt Securities, Available-for-Sale [Abstract] |  |
Amortized Cost | 30,197 |
Gross Unrealized Gain | 27 |
Gross Unrealized Loss | (3) |
Fair Value | $ 30,221 |

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- Definition Amount of short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 944 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(2)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478777/944-210-S99-1 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(1)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 + Details
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