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Gain on Sale of Non-Financial Asset - Additional Information (Details) - USD ($) $ in Thousands	12 Months Ended
	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

X

- 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

X

- 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

X

- References

No definition available.

+ Details

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