<?xml version="1.0" encoding="utf-8"?>
<xbrl
  xmlns="http://www.xbrl.org/2003/instance"
  xmlns:dei="http://xbrl.sec.gov/dei/2025"
  xmlns:ecd="http://xbrl.sec.gov/ecd/2025"
  xmlns:link="http://www.xbrl.org/2003/linkbase"
  xmlns:xlink="http://www.w3.org/1999/xlink">
    <link:schemaRef xlink:href="carl-20260420.xsd" xlink:type="simple"/>
    <context id="C_2d5c1d42-4bed-4d4b-99e1-3a27935ca2dc">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0001794546</identifier>
        </entity>
        <period>
            <startDate>2025-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <dei:AmendmentFlag
      contextRef="C_2d5c1d42-4bed-4d4b-99e1-3a27935ca2dc"
      id="F_92087c5a-d77e-48d3-9cb7-554ac276ec10">false</dei:AmendmentFlag>
    <dei:EntityCentralIndexKey
      contextRef="C_2d5c1d42-4bed-4d4b-99e1-3a27935ca2dc"
      id="F_b62791fb-957e-4f93-9a6c-dafc83fed429">0001794546</dei:EntityCentralIndexKey>
    <dei:DocumentType
      contextRef="C_2d5c1d42-4bed-4d4b-99e1-3a27935ca2dc"
      id="F_0301c021-bdef-42f2-93d4-492920439afd">DEF 14A</dei:DocumentType>
    <dei:EntityRegistrantName
      contextRef="C_2d5c1d42-4bed-4d4b-99e1-3a27935ca2dc"
      id="F_5f351904-1249-44fa-adf9-c4aec0e7d831">Carlsmed, Inc.</dei:EntityRegistrantName>
    <ecd:InsiderTrdPoliciesProcAdoptedFlag
      contextRef="C_2d5c1d42-4bed-4d4b-99e1-3a27935ca2dc"
      id="F_4ae3f4e4-070b-4bdd-a743-abc6fdcf604c">true</ecd:InsiderTrdPoliciesProcAdoptedFlag>
    <ecd:AwardTmgMnpiDiscTextBlock
      contextRef="C_2d5c1d42-4bed-4d4b-99e1-3a27935ca2dc"
      id="F_f1d7788a-7eaa-4635-a5f4-f73d8b589d14">&lt;p style="font-size:10pt;margin-top:18pt;font-family:Times New Roman;margin-bottom:0;text-align:left;"&gt;&lt;span style="color:#000000;white-space:pre-wrap;font-weight:bold;font-size:10pt;font-family:Times New Roman;font-kerning:none;min-width:fit-content;"&gt;Policies and Practices Related to the Grant of Certain Equity Awards&lt;/span&gt;&lt;/p&gt;&lt;p style="text-indent:4.533%;font-size:10pt;margin-top:6pt;font-family:Times New Roman;margin-bottom:0;text-align:left;"&gt;&lt;span style="font-size:10pt;font-family:Times New Roman;"&gt;&lt;span style="color:#000000;white-space:pre-wrap;font-size:10pt;font-family:Times New Roman;font-kerning:none;min-width:fit-content;"&gt;The compensation committee generally approves annual grants to executive officers at a meeting that occurs following performance review by the compensation committee. In addition to the annual grants, stock awards may be granted at other times during the year in special circumstances.&lt;/span&gt;&lt;/span&gt;&lt;span style="color:#000000;white-space:pre-wrap;font-size:10pt;font-family:Times New Roman;font-kerning:none;min-width:fit-content;"&gt; &lt;/span&gt;&lt;span style="font-size:10pt;font-family:Times New Roman;"&gt;&lt;span style="font-size:10pt;font-family:Times New Roman;"&gt;&lt;span style="color:#000000;white-space:pre-wrap;font-size:10pt;font-family:Times New Roman;font-kerning:none;min-width:fit-content;"&gt;We do not grant equity awards in anticipation of the release of material nonpublic information or time the release of material nonpublic information based on equity award grant dates, vesting events or sales events&lt;/span&gt;&lt;/span&gt;&lt;span style="color:#000000;white-space:pre-wrap;font-size:10pt;font-family:Times New Roman;font-kerning:none;min-width:fit-content;"&gt;.&lt;/span&gt;&lt;/span&gt;&lt;span style="color:#000000;white-space:pre-wrap;font-size:10pt;font-family:Times New Roman;font-kerning:none;min-width:fit-content;"&gt; &lt;/span&gt;&lt;span style="font-size:10pt;font-family:Times New Roman;"&gt;&lt;span style="color:#000000;white-space:pre-wrap;font-size:10pt;font-family:Times New Roman;font-kerning:none;min-width:fit-content;"&gt;We have not timed the disclosure of material nonpublic information for the purpose of affecting the value of executive compensation for our named executive officers&lt;/span&gt;&lt;/span&gt;&lt;span style="color:#000000;white-space:pre-wrap;font-size:10pt;font-family:Times New Roman;font-kerning:none;min-width:fit-content;"&gt;. We did not grant any stock options to our named executive officers in the last completed fiscal year during the period from four business days to one business day after the filing of any of our Quarterly Reports on Form 10-Q or Current Reports on Form 8-K that disclosed material nonpublic information.&lt;/span&gt;&lt;/p&gt;</ecd:AwardTmgMnpiDiscTextBlock>
    <ecd:AwardTmgMethodTextBlock
      contextRef="C_2d5c1d42-4bed-4d4b-99e1-3a27935ca2dc"
      id="F_ca45390a-af5d-4af5-abce-d69d3dab0f76">&lt;span style="color:#000000;white-space:pre-wrap;font-size:10pt;font-family:Times New Roman;font-kerning:none;min-width:fit-content;"&gt;The compensation committee generally approves annual grants to executive officers at a meeting that occurs following performance review by the compensation committee. In addition to the annual grants, stock awards may be granted at other times during the year in special circumstances.&lt;/span&gt;</ecd:AwardTmgMethodTextBlock>
    <ecd:AwardTmgMnpiCnsdrdFlag
      contextRef="C_2d5c1d42-4bed-4d4b-99e1-3a27935ca2dc"
      id="F_5a67856d-2f61-40e9-91c0-212e4c9acd12">true</ecd:AwardTmgMnpiCnsdrdFlag>
    <ecd:AwardTmgHowMnpiCnsdrdTextBlock
      contextRef="C_2d5c1d42-4bed-4d4b-99e1-3a27935ca2dc"
      id="F_e16d1a88-8784-4421-adb1-1d0938f415aa">&lt;span style="color:#000000;white-space:pre-wrap;font-size:10pt;font-family:Times New Roman;font-kerning:none;min-width:fit-content;"&gt;We do not grant equity awards in anticipation of the release of material nonpublic information or time the release of material nonpublic information based on equity award grant dates, vesting events or sales events&lt;/span&gt;</ecd:AwardTmgHowMnpiCnsdrdTextBlock>
    <ecd:AwardTmgPredtrmndFlag
      contextRef="C_2d5c1d42-4bed-4d4b-99e1-3a27935ca2dc"
      id="F_fa979fc7-0abd-43df-8b4b-51783622f616">false</ecd:AwardTmgPredtrmndFlag>
</xbrl>
