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Other Income/(Expense), Net - Schedule of Other Income/Expense, Net (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Other Income and Expenses [Abstract] |  |  |
Bank interest receivable | $ 704 | $ 83 | $ 29
Accretion on U.S Treasury Bills | 3,768 | 1,720 | 251
Total other income | $ 4,472 | $ 1,803 | $ 280

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- Definition Accretion of securities. + References No definition available. + Details
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Namespace Prefix: | sln_
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Balance Type: | credit
Period Type: | duration

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- Definition Bank interest receivable. + References No definition available. + Details
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Namespace Prefix: | sln_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Amount of income related to nonoperating activities, classified as other. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 220 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(7)(d)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147483621/220-10-S99-2 + Details
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