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Fair Value Measurements - Summary of Assets Measured at Fair Value (Detail) | Jun. 30, 2020 USD ($)
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Level 1 |
Assets: |
Cash held in Trust Account | $ 230,000,000

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- Definition Cash held in trust account, fair value disclosure. + References No definition available. + Details
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Namespace Prefix: | kcac_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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

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- Details
Name: | us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel1Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |