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Assumed Common Stock Warrants - Additional Information (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Class Of Warrant Or Right [Line Items]
Non-cash change in fair value of assumed common stock warrant liabilities	$ 68,934		$ 168,674
Public Warrants
Class Of Warrant Or Right [Line Items]
Warrants sold		11,499,989
Warrants exercise price per share		$ 11.50
Warrant exercisable number of shares		1
Private Placement Warrants
Class Of Warrant Or Right [Line Items]
Warrants sold		6,650,000
Warrant issued in connection with the closing of business combination		75,000

X

- Definition

Change in fair value of assumed common stock warrant liabilities.

+ References

No definition available.

+ Details

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X

- Definition

Class of warrant or right issued in connection with the closing of business combination.

+ References

No definition available.

+ Details

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Namespace Prefix:	qs_
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Period Type:	duration

X

- Definition

Warrants sold.

+ References

No definition available.

+ Details

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Namespace Prefix:	qs_
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Balance Type:	na
Period Type:	duration

X

- Definition

Exercise price per share or per unit of warrants or rights outstanding.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 3
-URI https://asc.fasb.org/extlink&oid=126973232&loc=d3e21475-112644

+ Details

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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- Definition

Number of securities into which each warrant or right may be converted. For example, but not limited to, each warrant may be converted into two shares.

+ References

No definition available.

+ Details

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- Details

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X

- Details

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