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v3.23.1

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Share-Based Compensation (Details) | Dec. 31, 2022 $ / shares
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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

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- 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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Balance Type: | na
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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Balance Type: | na
Period Type: | duration

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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