Nature of the Business - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended				6 Months Ended
	Jun. 30, 2025	Mar. 31, 2025	Jun. 30, 2024	Mar. 31, 2024	Jun. 30, 2025	Jun. 30, 2024	Dec. 31, 2024
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Net loss	$ (11,350)	$ (10,196)	$ (5,650)	$ (3,407)	$ (21,546)	$ (9,057)
Cash flows from operating activities					(19,980)	(8,492)
Accumulated deficit	(138,107)				(138,107)		$ (116,561)
Cash and cash equivalents	$ 88,426		$ 6,239		$ 88,426	$ 6,239	$ 1,639

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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+ Details

- Definition

Amount of accumulated undistributed earnings (deficit).

+ References + Details

Kalaris Therapeutics, Inc. 10-Q