Government Assistance, Liability, Excluding Accrued Interest, Noncurrent

No definition available.

Name:	ses_GovernmentAssistanceLiabilityExcludingAccruedInterestNoncurrent
Namespace Prefix:	ses_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 832
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483507/832-10-50-3

+ Details

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

- Definition

Duration of government assistance transaction, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 832
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 4
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483507/832-10-50-4

+ Details

Name:	us-gaap_GovernmentAssistanceTransactionDuration
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Details

Name:	srt_RangeAxis=srt_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Government Grant (Details) $ in Millions, ₩ in Billions	1 Months Ended
Government Grant (Details) $ in Millions, ₩ in Billions	Dec. 31, 2022	Sep. 30, 2025 KRW (₩)	Sep. 30, 2025 USD ($)	Dec. 31, 2024 KRW (₩)	Dec. 31, 2024 USD ($)
Government Grant
Government assistance, transaction duration	5 years
Unearned government grant, excluding accrued interest		₩ 12.0	$ 8.6	₩ 12.0	$ 8.1
Maximum
Government Grant
Government assistance, transaction duration	10 years