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DEFINED CONTRIBUTION PENSION - Additional Information (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
DEFINED CONTRIBUTION PENSION
Amounts owed to the pension scheme	$ 5	$ 1

X

- Definition

Amount of obligations due under defined contribution plan.

+ References

No definition available.

+ Details

Name:	smtk_DefinedContributionPlanDueToPensionFund
Namespace Prefix:	smtk_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- References

No definition available.

+ Details

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