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COMMITMENTS (Details)	Dec. 14, 2020 item	Mar. 31, 2021 USD ($) $ / shares	Dec. 31, 2020 USD ($)	Dec. 17, 2020 USD ($)
COMMITMENTS
Minimum percentage of founder share holders entitled to make demands	30.00%
Maximum number of demands for registration of securities | item	3
Deferred fee per unit | $ / shares		$ 0.35
Deferred underwriting fee payable | $		$ 9,660,000	$ 9,660,000	$ 9,660,000

X

- Definition

Represents the deferred fee per unit.

+ References

No definition available.

+ Details

Name:	kinsu_DeferredFeePerUnit
Namespace Prefix:	kinsu_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	instant

X

- Definition

The carrying value as of balance sheet date of underwriting fees payable or deferred, classified as noncurrent.

+ References

No definition available.

+ Details

Name:	kinsu_DeferredOfferingCostsNoncurrent
Namespace Prefix:	kinsu_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Represents the maximum number of demands for registration of securities.

+ References

No definition available.

+ Details

Name:	kinsu_MaximumNumberOfDemandsForRegistrationOfSecurities
Namespace Prefix:	kinsu_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Minimum Percentage of Founder Share Holders Entitled To Make Demands.

+ References

No definition available.

+ Details

Name:	kinsu_MinimumPercentageOfFounderShareHoldersEntitledToMakeDemands
Namespace Prefix:	kinsu_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- References

No definition available.

+ Details

Name:	us-gaap_CommitmentsAndContingenciesDisclosureAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration