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Income Taxes - Unrecognized Tax Benefits (Details) $ in Millions	6 Months Ended
	Jun. 30, 2023 USD ($)
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Unrecognized tax benefits, period increase (decrease), transfer pricing adjustments	$ 0.9

X

- Definition

Unrecognized Tax Benefits, Period Increase (Decrease), Transfer Pricing Adjustments

+ References

No definition available.

+ Details

Name:	ses_UnrecognizedTaxBenefitsPeriodIncreaseDecreaseTransferPricingAdjustments
Namespace Prefix:	ses_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

+ References

No definition available.

+ Details

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