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Capital Commitments and Contingent Liabilities - Additional Information (Details) - USD ($) $ in Thousands | Mar. 31, 2025 | Mar. 31, 2024
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Commitments and Contingencies Disclosure [Abstract] |  |
Capital commitments | $ 0 | $ 0

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- Definition Capital commitments. + References No definition available. + Details
Name: | sln_CapitalCommitments
Namespace Prefix: | sln_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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