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Condensed Consolidated Statements of Operations and Comprehensive Income (Loss) (Unaudited) (Parenthetical) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Income Statement [Abstract]
Net income (loss) attributable to non-controlling interest, tax	$ 0	$ 0	$ 0	$ 0

X

- Definition

Net income loss tax portion attributable to noncontrolling interest.

+ References

No definition available.

+ Details

Name:	qs_NetIncomeLossTaxPortionAttributableToNoncontrollingInterest
Namespace Prefix:	qs_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- References

No definition available.

+ Details

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