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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 |

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- Definition Change in fair value of assumed common stock warrant liabilities. + References No definition available. + Details
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Namespace Prefix: | qs_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- 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_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

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- Definition Warrants sold. + References No definition available. + Details
Name: | qs_WarrantsSold
Namespace Prefix: | qs_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

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- 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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Namespace Prefix: | us-gaap_
Data Type: | dtr-types:perShareItemType
Balance Type: | na
Period Type: | instant

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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. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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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
Name: | us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByEachWarrantOrRight
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |