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BALANCE SHEET COMPONENTS - Schedule of activity in reserve for obsolescence (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Inventory, Valuation Reserves [Roll Forward]
Balance as of beginning of period	$ 0	$ 5	$ 0	$ 5
Increase in reserve	0	0	0	0
Amounts relieved	0	(5)	0	(5)
Balance as of end of period	$ 0	$ 0	$ 0	$ 0

X

- Definition

Inventory Valuation Reserves, Additions

+ References

No definition available.

+ Details

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Namespace Prefix:	snes_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Inventory, Valuation Reserves, Amount Relieved

+ References

No definition available.

+ Details

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Namespace Prefix:	snes_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Inventory, Valuation Reserves

+ References

No definition available.

+ Details

Name:	snes_InventoryValuationReservesRollForward
Namespace Prefix:	snes_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Amount of valuation reserve for inventory.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 330
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 2
-Subparagraph (SAB Topic 5.BB)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480581/330-10-S99-2

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 210
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(6))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1

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Balance Type:	credit
Period Type:	instant