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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

X

- 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

X

- Details

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