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Commitments and Contingencies (Details) - USD ($) $ in Millions	Sep. 30, 2024	Jun. 30, 2023
Commitments and Contingencies Disclosure [Abstract]
Obligated to pay, year one		$ 5.0
Obligated to pay, year two		$ 5.0
Remaining contractual obligated to be pay	$ 8.0

X

- Definition

Remaining Contractual Obligation, To Be Paid

+ References

No definition available.

+ Details

Name:	sst_RemainingContractualObligationToBePaid
Namespace Prefix:	sst_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- References

No definition available.

+ Details

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

X

- Definition

Amount of contractual obligation to be paid in next fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

+ References

No definition available.

+ Details

Name:	us-gaap_ContractualObligationDueInNextTwelveMonths
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Amount of contractual obligation to be paid in second fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

+ References

No definition available.

+ Details

Name:	us-gaap_ContractualObligationDueInSecondYear
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant