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Sponsor Earn-Out Liability - Transfers (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2022	Sep. 30, 2022
Contingent Liability [Abstract]
Transfers between fair value hierarchy levels	$ 0	$ 0

X

- References

No definition available.

+ Details

Name:	ses_ContingentLiabilityAbstract
Namespace Prefix:	ses_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Fair Value Disclosures, Transfers Between Fair Value Hierarchy Levels

+ References

No definition available.

+ Details

Name:	ses_FairValueDisclosuresTransfersBetweenFairValueHierarchyLevels
Namespace Prefix:	ses_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration