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v3.25.0.1

Other Assets - Additional Information (Details) - USD ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Research and Development |  |
Other Assets [Line Items] |  |
Prepayments assets | $ 11.0 | $ 8.7

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- Definition Other assets. + References No definition available. + Details
Name: | sln_OtherAssetsLineItems
Namespace Prefix: | sln_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Prepayments assets. + References No definition available. + Details
Name: | sln_PrepaymentsAssets
Namespace Prefix: | sln_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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