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Summary of Significant Accounting Policies - Summary of Sponsorship Funding Payments (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023
Accounting Policies [Abstract] |  |
Balance at Beginning | $ 3,493 | $ 0
Amounts incurred | 1,210 | 3,527
Recorded sponsor funding reduction | (844) | (34)
Balance at Ending | $ 3,859 | $ 3,493

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- Definition Amounts incurred in sponsorship funding. + References No definition available. + Details
Name: | stsff_AmountsIncurredInSponsorshipFunding
Namespace Prefix: | stsff_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Recorded sponsor funding reductions. + References No definition available. + Details
Name: | stsff_RecordedSponsorFundingReductions
Namespace Prefix: | stsff_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Sponsorship funding payments balance. + References No definition available. + Details
Name: | stsff_SponsorshipFundingPaymentsBalance
Namespace Prefix: | stsff_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- References No definition available. + Details
Name: | us-gaap_AccountingPoliciesAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration