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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES -Estimated Useful Lives of Property and Equipment (Details)	12 Months Ended
	Dec. 31, 2022
Computer equipment
Property, Plant and Equipment [Line Items]
Estimated useful life	3 years
Office equipment
Property, Plant and Equipment [Line Items]
Estimated useful life	3 years
Furniture, fixtures and equipment | Minimum
Property, Plant and Equipment [Line Items]
Estimated useful life	3 years
Furniture, fixtures and equipment | Maximum
Property, Plant and Equipment [Line Items]
Estimated useful life	7 years
Motor vehicles
Property, Plant and Equipment [Line Items]
Estimated useful life	4 years
Internal-use software development
Property, Plant and Equipment [Line Items]
Estimated useful life	3 years

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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

X

- Definition

Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

+ References

No definition available.

+ Details

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X

- Details

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Namespace Prefix:
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X

- Details

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Data Type:	na
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Period Type:

X

- Details

Name:	us-gaap_PropertyPlantAndEquipmentByTypeAxis=sst_FurnitureFixturesAndEquipmentMember
Namespace Prefix:
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X

- Details

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- Details

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X

- Details

Name:	us-gaap_PropertyPlantAndEquipmentByTypeAxis=us-gaap_VehiclesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_PropertyPlantAndEquipmentByTypeAxis=us-gaap_SoftwareAndSoftwareDevelopmentCostsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: