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Capital Commitments and Contingent Liabilities - Additional Information (Details) - USD ($) $ in Thousands	Sep. 30, 2025	Sep. 30, 2024
Commitments and Contingencies Disclosure [Abstract]
Capital commitments	$ 0	$ 0

X

- Definition

Capital commitments.

+ References

No definition available.

+ Details

Name:	sln_CapitalCommitments
Namespace Prefix:	sln_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- References

No definition available.

+ Details

Name:	us-gaap_CommitmentsAndContingenciesDisclosureAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration