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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Share-Based Compensation (Details)	Dec. 31, 2022 $ / shares
Restricted Stock Units (RSUs) | Business Combination Agreement
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Business acquisition, share price (in dollars per share)	$ 10.00

X

- Definition

Price of a single share of a number of saleable stocks paid or offered to be paid in a business combination.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	dtr-types:perShareItemType
Balance Type:	na
Period Type:	instant

X

- 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

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

X

- Details

Name:	us-gaap_AwardTypeAxis=us-gaap_RestrictedStockUnitsRSUMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_BusinessAcquisitionAxis=sst_BusinessCombinationAgreementMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: