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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

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- Definition Noncontrolling Interest, Payment On Tax Receivable Agreement + References No definition available. + Details
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- Definition Tax Receivable Agreement, Payments Due + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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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_
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- Details
Name: | dei_LegalEntityAxis=sst_S1HoldcoLLCMember
Namespace Prefix: |
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Balance Type: |
Period Type: |