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Gain on Sale of Non-Financial Asset - Additional Information (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2025 | Dec. 31, 2024
Receivables [Abstract] |  |
Gain on sale of non-financial asset | $ 12,500 | $ 0
Received cash on sale of non-financial asset | $ 12,500 | $ 22,625

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- Definition Gain on sale of non-financial asset. + References No definition available. + Details
Name: | sepn_GainOnSaleOfNonFinancialAsset
Namespace Prefix: | sepn_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Proceeds from sale of non-financial asset + References No definition available. + Details
Name: | sepn_ProceedsFromSaleOfNonFinancialAsset
Namespace Prefix: | sepn_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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