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INCOME TAXES - Narrative (Details) - S1 Holdco, LLC - USD ($) $ in Thousands	1 Months Ended	2 Months Ended	3 Months Ended
	Jan. 26, 2022	Mar. 31, 2022	Mar. 31, 2023	Dec. 31, 2022
Income Tax Examination [Line Items]
TRA payment including interest amount	$ 0	$ 0	$ 0
TRA payments due			$ 1,477,000	$ 1,036,000

X

- Definition

Noncontrolling Interest, Payment On Tax Receivable Agreement

+ References

No definition available.

+ Details

Name:	sst_NoncontrollingInterestPaymentOnTaxReceivableAgreement
Namespace Prefix:	sst_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Tax Receivable Agreement, Payments Due

+ References

No definition available.

+ Details

Name:	sst_TaxReceivableAgreementPaymentsDue
Namespace Prefix:	sst_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
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_IncomeTaxExaminationLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	dei_LegalEntityAxis=sst_S1HoldcoLLCMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: