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Fair Value Measurements - Summary of Assets Measured at Fair Value (Detail)	Jun. 30, 2020 USD ($)
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

Name:	kcac_CashHeldInTrustAccountFairValueDisclosure
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: