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Trade and Other Payables - Additional Information (Details) - USD ($) $ in Thousands | Dec. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Trade And Other Payables [Line Items] |  |
Accruals and other payables | $ 8,361 | $ 7,847
Research and Development |  |
Trade And Other Payables [Line Items] |  |
Accruals and other payables | $ 5,900 | $ 5,600

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- Definition Trade and other payables. + References No definition available. + Details
Name: | sln_TradeAndOtherPayablesLineItems
Namespace Prefix: | sln_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Amount of expenses incurred but not yet paid nor invoiced, and liabilities classified as other. + References No definition available. + Details
Name: | us-gaap_AccruedLiabilitiesAndOtherLiabilities
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Details
Name: | us-gaap_IncomeStatementLocationAxis=us-gaap_ResearchAndDevelopmentExpenseMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |