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Income Taxes - Schedule of Deferred Tax Assets (Parenthetical) (Details) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Income Tax Disclosure [Abstract]
Accumulated tax losses related to corporate income taxes	$ 7.4	$ 8.6
Accumulated losses related to trade taxes	$ 6.5	$ 7.5

X

- Definition

Deferred tax asset, accumulated tax losses related to corporate income taxes.

+ References

No definition available.

+ Details

Name:	sln_DeferredTaxAssetAccumulatedTaxLossesRelatedToCorporateIncomeTaxes
Namespace Prefix:	sln_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Deferred tax asset, accumulated tax losses related to trade taxes.

+ References

No definition available.

+ Details

Name:	sln_DeferredTaxAssetAccumulatedTaxLossesRelatedToTradeTaxes
Namespace Prefix:	sln_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- References

No definition available.

+ Details

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