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v3.22.2.2

Balance Sheet Components - Additional Information (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2022 | Sep. 30, 2021 | Sep. 30, 2022 | Sep. 30, 2021
Property, Plant and Equipment [Abstract] |  |  |  |
Depreciation and amortization expense related to property and equipment | $ 8.0 | $ 2.9 | $ 18.3 | $ 8.1

X
- 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