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Related-Party Transactions (Details)	Oct. 28, 2024
Related Party Transactions [Abstract]
Former related party, fully diluted voting interest (as a percent)	5.00%

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- Definition

Former Related Party, Fully Diluted Voting Interest Percentage

+ References

No definition available.

+ Details

Name:	ses_FormerRelatedPartyFullyDilutedVotingInterestPercentage
Namespace Prefix:	ses_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

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- References

No definition available.

+ Details

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