XML 43 R33.htm IDEA: XBRL DOCUMENT
v3.25.3

NATURE OF BUSINESS AND BASIS OF PRESENTATION (Details) $ in Millions | Sep. 30, 2025 USD ($)
--- | ---
Organization, Consolidation and Presentation of Financial Statements [Abstract] |
Excess capital determined to return to shareholders | $ 375.0

X
- Definition Excess Capital to Return to Shareholders + References No definition available. + Details
Name: | kros_ExcessCapitalToReturnToShareholders
Namespace Prefix: | kros_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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