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Condensed Consolidated Statements of Convertible Preferred Stock and Stockholders' Equity (unaudited) (Parenthetical) $ in Thousands | 3 Months Ended
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Jun. 30, 2024 USD ($)
Unrealized Gain On Investments Net Of Tax | $ 0

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- Definition Unrealized Gain On Investments Net Of Tax + References No definition available. + Details
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Namespace Prefix: | krro_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration