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Employee Benefit Plans (Details) - USD ($) | 6 Months Ended | 12 Months Ended
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Jun. 30, 2025 | Dec. 31, 2024
Dutch plan |  |
Employee Benefit Plans |  |
Contributions expensed | $ 45,000 | $ 77,000
United States 401K plan |  |
Employee Benefit Plans |  |
Contributions expensed | $ 25,000 | $ 36,000

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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. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 70 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480794/715-70-50-1 + Details
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