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Stockholders Equity - Schedule of Assumption Used for Stock Options Activity (Details) | 3 Months Ended
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Mar. 31, 2024
Equity [Abstract] |
Dividend Yield | 0.00%
Volatility | 74.72%
Risk-Free Interest Rate | 4.17%
Expected Life | 3 years 6 months

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- Definition Weighted average assumption, Expected life + References No definition available. + Details
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Namespace Prefix: | king_
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Period Type: | duration

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- Definition Weighted average assumption, Risk free intererst rate + References No definition available. + Details
Name: | king_WeightedAverageAssumptionRiskFreeIntererstRate
Namespace Prefix: | king_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Weighted average assumptions, Dividend Yield + References No definition available. + Details
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Namespace Prefix: | king_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Weighted average assumptions, volatility + References No definition available. + Details
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Namespace Prefix: | king_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

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- References No definition available. + Details
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Namespace Prefix: | us-gaap_
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Period Type: | duration