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Consolidated Statements of Stockholders’ Equity (Parenthetical) $ in Thousands	12 Months Ended
	Dec. 31, 2025 USD ($) $ / shares
Common stock, par value (in USD per share) | $ / shares	$ 0.0001
Repurchase of treasury stock | $	$ 9,558

X

- Definition

Repurchase of Treasury Stock, Excise Tax, Direct Fees and Expenses

+ References

No definition available.

+ Details

Name:	kros_RepurchaseOfTreasuryStockExciseTaxDirectFeesAndExpenses
Namespace Prefix:	kros_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Face amount or stated value per share of common stock.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 210
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(29))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1

+ Details

Name:	us-gaap_CommonStockParOrStatedValuePerShare
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:perShareItemType
Balance Type:	na
Period Type:	instant