v3.25.4

Income Taxes - Additional Information (Details) - USD ($)	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024
Operating Loss Carryforwards [Line Items]
Federal or state income tax expense	$ 0	$ 0
Valuation allowance increased	8,000,000	6,100,000
Federal net operating loss carryforwards	69,000,000
State net operating loss carryforwards	57,500,000
State Operating Loss Carry forwards expiring 2032	47,000,000
State Operating Loss Carry forwards indefinitely	$ 10,500,000
State operating loss carry forwards expiration year	2032
Federal operating loss carry forwards expiration year	2039
Federal research and development credit carryforwards	$ 1,300,000
State research and development credit carryforwards	$ 1,000,000
Ownership change percentage of outstanding stock	50.00%
Unrecognized tax benefits	$ 600,000	400,000
Income tax expense	0	0
Interest and penalties related to income tax matters	0	0
Income tax matters accrued interest or penalties	$ 0	$ 0
Income tax examination, description	Generally, the Company’s federal and state income tax returns since inception in 2018 are subject to examination by tax authorities. The Company is not under examination by any tax jurisdiction.
Maximum
Operating Loss Carryforwards [Line Items]
Federal losses offset percentage on future annual taxable income	80.00%

Federal losses offset percentage on future annual taxable income.

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Ownership change percentage of outstanding stock.

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible domestic operating loss carryforwards. Excludes state and local operating loss carryforwards.

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible state and local operating loss carryforwards.

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Amount of current and deferred federal, state, and local tax expense (benefit) attributable to income (loss) from continuing operations. Includes, but is not limited to, current and deferred national, regional, territorial, and provincial tax expense (benefit) for non-US (United States of America) jurisdiction.

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A brief description of status of the tax examination, significant findings to date, and the entity's position with respect to the findings.

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The amount of estimated penalties and interest accrued as of the balance sheet date arising from income tax examinations.

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The sum of the amounts of estimated penalties and interest recognized in the period arising from income tax examinations.

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CARLSMED, INC. 10-K