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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

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- Definition Net income loss tax portion attributable to noncontrolling interest. + References No definition available. + Details
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Namespace Prefix: | qs_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- References No definition available. + Details
Name: | us-gaap_IncomeStatementAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration