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Balance Sheet Components - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Property, Plant and Equipment [Abstract]
Depreciation and amortization expense related to property and equipment	$ 9.6	$ 5.5	$ 18.8	$ 10.3

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- Definition

Depreciation and amortization of property and equipment.

+ References

No definition available.

+ Details

Name:	qs_DepreciationAndAmortizationOfPropertyAndEquipment
Namespace Prefix:	qs_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

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- References

No definition available.

+ Details

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