<?xml version='1.0' encoding='utf-8'?>
<FilingSummary>
  <Version>3.19.3</Version>
  <ProcessingTime/>
  <ReportFormat>html</ReportFormat>
  <ContextCount>179</ContextCount>
  <ElementCount>345</ElementCount>
  <EntityCount>1</EntityCount>
  <FootnotesReported>false</FootnotesReported>
  <SegmentCount>47</SegmentCount>
  <ScenarioCount>0</ScenarioCount>
  <TuplesReported>false</TuplesReported>
  <UnitCount>7</UnitCount>
  <MyReports>
    <Report instance="kids-20190930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R1.htm</HtmlFileName>
      <LongName>0401401 - Document - Cover</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.orthopediatrics.com/role/Cover</Role>
      <ShortName>Cover</ShortName>
      <MenuCategory>Cover</MenuCategory>
      <Position>1</Position>
    </Report>
    <Report instance="kids-20190930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R2.htm</HtmlFileName>
      <LongName>1001001 - Statement - CONDENSED CONSOLIDATED BALANCE SHEETS</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.orthopediatrics.com/role/CONDENSEDCONSOLIDATEDBALANCESHEETS</Role>
      <ShortName>CONDENSED CONSOLIDATED BALANCE SHEETS</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>2</Position>
    </Report>
    <Report instance="kids-20190930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R3.htm</HtmlFileName>
      <LongName>1002002 - Statement - CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.orthopediatrics.com/role/CONDENSEDCONSOLIDATEDBALANCESHEETSParenthetical</Role>
      <ShortName>CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical)</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>3</Position>
    </Report>
    <Report instance="kids-20190930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R4.htm</HtmlFileName>
      <LongName>1003003 - Statement - CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.orthopediatrics.com/role/CONDENSEDCONSOLIDATEDSTATEMENTSOFOPERATIONS</Role>
      <ShortName>CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>4</Position>
    </Report>
    <Report instance="kids-20190930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R5.htm</HtmlFileName>
      <LongName>1004004 - Statement - CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.orthopediatrics.com/role/CONDENSEDCONSOLIDATEDSTATEMENTSOFCOMPREHENSIVELOSS</Role>
      <ShortName>CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>5</Position>
    </Report>
    <Report instance="kids-20190930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R6.htm</HtmlFileName>
      <LongName>1005005 - Statement - CONDENSED CONSOLIDATED STATEMENT OF STOCKHOLDERS??? EQUITY</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.orthopediatrics.com/role/CONDENSEDCONSOLIDATEDSTATEMENTOFSTOCKHOLDERSEQUITY</Role>
      <ShortName>CONDENSED CONSOLIDATED STATEMENT OF STOCKHOLDERS??? EQUITY</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>6</Position>
    </Report>
    <Report instance="kids-20190930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R7.htm</HtmlFileName>
      <LongName>1006006 - Statement - CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.orthopediatrics.com/role/CONDENSEDCONSOLIDATEDSTATEMENTSOFCASHFLOWS</Role>
      <ShortName>CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>7</Position>
    </Report>
    <Report instance="kids-20190930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R8.htm</HtmlFileName>
      <LongName>2101101 - Disclosure - BUSINESS</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.orthopediatrics.com/role/BUSINESS</Role>
      <ShortName>BUSINESS</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>8</Position>
    </Report>
    <Report instance="kids-20190930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R9.htm</HtmlFileName>
      <LongName>2103102 - Disclosure - SIGNIFICANT ACCOUNTING POLICIES</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.orthopediatrics.com/role/SIGNIFICANTACCOUNTINGPOLICIES</Role>
      <ShortName>SIGNIFICANT ACCOUNTING POLICIES</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>9</Position>
    </Report>
    <Report instance="kids-20190930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R10.htm</HtmlFileName>
      <LongName>2110103 - Disclosure - BUSINESS COMBINATION</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.orthopediatrics.com/role/BUSINESSCOMBINATION</Role>
      <ShortName>BUSINESS COMBINATION</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>10</Position>
    </Report>
    <Report instance="kids-20190930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R11.htm</HtmlFileName>
      <LongName>2113104 - Disclosure - DISCONTINUED OPERATIONS</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.orthopediatrics.com/role/DISCONTINUEDOPERATIONS</Role>
      <ShortName>DISCONTINUED OPERATIONS</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>11</Position>
    </Report>
    <Report instance="kids-20190930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R12.htm</HtmlFileName>
      <LongName>2116105 - Disclosure - DEBT AND CREDIT ARRANGEMENTS</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.orthopediatrics.com/role/DEBTANDCREDITARRANGEMENTS</Role>
      <ShortName>DEBT AND CREDIT ARRANGEMENTS</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>12</Position>
    </Report>
    <Report instance="kids-20190930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R13.htm</HtmlFileName>
      <LongName>2120106 - Disclosure - STRATEGIC ARRANGEMENTS</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.orthopediatrics.com/role/STRATEGICARRANGEMENTS</Role>
      <ShortName>STRATEGIC ARRANGEMENTS</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>13</Position>
    </Report>
    <Report instance="kids-20190930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R14.htm</HtmlFileName>
      <LongName>2122107 - Disclosure - INCOME TAXES</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.orthopediatrics.com/role/INCOMETAXES</Role>
      <ShortName>INCOME TAXES</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>14</Position>
    </Report>
    <Report instance="kids-20190930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R15.htm</HtmlFileName>
      <LongName>2124108 - Disclosure - STOCKHOLDERS' EQUITY</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.orthopediatrics.com/role/STOCKHOLDERSEQUITY</Role>
      <ShortName>STOCKHOLDERS' EQUITY</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>15</Position>
    </Report>
    <Report instance="kids-20190930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R16.htm</HtmlFileName>
      <LongName>2129109 - Disclosure - NET LOSS PER SHARE</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.orthopediatrics.com/role/NETLOSSPERSHARE</Role>
      <ShortName>NET LOSS PER SHARE</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>16</Position>
    </Report>
    <Report instance="kids-20190930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R17.htm</HtmlFileName>
      <LongName>2133110 - Disclosure - BUSINESS SEGMENT</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.orthopediatrics.com/role/BUSINESSSEGMENT</Role>
      <ShortName>BUSINESS SEGMENT</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>17</Position>
    </Report>
    <Report instance="kids-20190930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R18.htm</HtmlFileName>
      <LongName>2138111 - Disclosure - RELATED PARTY TRANSACTIONS</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.orthopediatrics.com/role/RELATEDPARTYTRANSACTIONS</Role>
      <ShortName>RELATED PARTY TRANSACTIONS</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>18</Position>
    </Report>
    <Report instance="kids-20190930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R19.htm</HtmlFileName>
      <LongName>2140112 - Disclosure - EMPLOYEE BENEFIT PLAN</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.orthopediatrics.com/role/EMPLOYEEBENEFITPLAN</Role>
      <ShortName>EMPLOYEE BENEFIT PLAN</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>19</Position>
    </Report>
    <Report instance="kids-20190930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R20.htm</HtmlFileName>
      <LongName>2142113 - Disclosure - COMMITMENTS AND CONTINGENCIES</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.orthopediatrics.com/role/COMMITMENTSANDCONTINGENCIES</Role>
      <ShortName>COMMITMENTS AND CONTINGENCIES</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>20</Position>
    </Report>
    <Report instance="kids-20190930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R21.htm</HtmlFileName>
      <LongName>2204201 - Disclosure - SIGNIFICANT ACCOUNTING POLICIES (Policies)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.orthopediatrics.com/role/SIGNIFICANTACCOUNTINGPOLICIESPolicies</Role>
      <ShortName>SIGNIFICANT ACCOUNTING POLICIES (Policies)</ShortName>
      <MenuCategory>Policies</MenuCategory>
      <Position>21</Position>
    </Report>
    <Report instance="kids-20190930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R22.htm</HtmlFileName>
      <LongName>2305301 - Disclosure - SIGNIFICANT ACCOUNTING POLICIES (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.orthopediatrics.com/role/SIGNIFICANTACCOUNTINGPOLICIESTables</Role>
      <ShortName>SIGNIFICANT ACCOUNTING POLICIES (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.orthopediatrics.com/role/SIGNIFICANTACCOUNTINGPOLICIES</ParentRole>
      <Position>22</Position>
    </Report>
    <Report instance="kids-20190930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R23.htm</HtmlFileName>
      <LongName>2311302 - Disclosure - BUSINESS COMBINATION (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.orthopediatrics.com/role/BUSINESSCOMBINATIONTables</Role>
      <ShortName>BUSINESS COMBINATION (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.orthopediatrics.com/role/BUSINESSCOMBINATION</ParentRole>
      <Position>23</Position>
    </Report>
    <Report instance="kids-20190930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R24.htm</HtmlFileName>
      <LongName>2314303 - Disclosure - DISCONTINUED OPERATIONS (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.orthopediatrics.com/role/DISCONTINUEDOPERATIONSTables</Role>
      <ShortName>DISCONTINUED OPERATIONS (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.orthopediatrics.com/role/DISCONTINUEDOPERATIONS</ParentRole>
      <Position>24</Position>
    </Report>
    <Report instance="kids-20190930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R25.htm</HtmlFileName>
      <LongName>2317304 - Disclosure - DEBT AND CREDIT ARRANGEMENTS (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.orthopediatrics.com/role/DEBTANDCREDITARRANGEMENTSTables</Role>
      <ShortName>DEBT AND CREDIT ARRANGEMENTS (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.orthopediatrics.com/role/DEBTANDCREDITARRANGEMENTS</ParentRole>
      <Position>25</Position>
    </Report>
    <Report instance="kids-20190930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R26.htm</HtmlFileName>
      <LongName>2325305 - Disclosure - STOCKHOLDERS' EQUITY (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.orthopediatrics.com/role/STOCKHOLDERSEQUITYTables</Role>
      <ShortName>STOCKHOLDERS' EQUITY (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.orthopediatrics.com/role/STOCKHOLDERSEQUITY</ParentRole>
      <Position>26</Position>
    </Report>
    <Report instance="kids-20190930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R27.htm</HtmlFileName>
      <LongName>2330306 - Disclosure - NET LOSS PER SHARE (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.orthopediatrics.com/role/NETLOSSPERSHARETables</Role>
      <ShortName>NET LOSS PER SHARE (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.orthopediatrics.com/role/NETLOSSPERSHARE</ParentRole>
      <Position>27</Position>
    </Report>
    <Report instance="kids-20190930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R28.htm</HtmlFileName>
      <LongName>2334307 - Disclosure - BUSINESS SEGMENT (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.orthopediatrics.com/role/BUSINESSSEGMENTTables</Role>
      <ShortName>BUSINESS SEGMENT (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.orthopediatrics.com/role/BUSINESSSEGMENT</ParentRole>
      <Position>28</Position>
    </Report>
    <Report instance="kids-20190930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R29.htm</HtmlFileName>
      <LongName>2402402 - Disclosure - BUSINESS (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.orthopediatrics.com/role/BUSINESSDetails</Role>
      <ShortName>BUSINESS (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.orthopediatrics.com/role/BUSINESSCOMBINATIONTables</ParentRole>
      <Position>29</Position>
    </Report>
    <Report instance="kids-20190930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R30.htm</HtmlFileName>
      <LongName>2406403 - Disclosure - SIGNIFICANT ACCOUNTING POLICIES - Narrative (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.orthopediatrics.com/role/SIGNIFICANTACCOUNTINGPOLICIESNarrativeDetails</Role>
      <ShortName>SIGNIFICANT ACCOUNTING POLICIES - Narrative (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>30</Position>
    </Report>
    <Report instance="kids-20190930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R31.htm</HtmlFileName>
      <LongName>2407404 - Disclosure - SIGNIFICANT ACCOUNTING POLICIES - Borrowings (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.orthopediatrics.com/role/SIGNIFICANTACCOUNTINGPOLICIESBorrowingsDetails</Role>
      <ShortName>SIGNIFICANT ACCOUNTING POLICIES - Borrowings (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>31</Position>
    </Report>
    <Report instance="kids-20190930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R32.htm</HtmlFileName>
      <LongName>2408405 - Disclosure - SIGNIFICANT ACCOUNTING POLICIES - Assets Useful Lives (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.orthopediatrics.com/role/SIGNIFICANTACCOUNTINGPOLICIESAssetsUsefulLivesDetails</Role>
      <ShortName>SIGNIFICANT ACCOUNTING POLICIES - Assets Useful Lives (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>32</Position>
    </Report>
    <Report instance="kids-20190930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R33.htm</HtmlFileName>
      <LongName>2409406 - Disclosure - SIGNIFICANT ACCOUNTING POLICIES - Stock-Based Compensation (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.orthopediatrics.com/role/SIGNIFICANTACCOUNTINGPOLICIESStockBasedCompensationDetails</Role>
      <ShortName>SIGNIFICANT ACCOUNTING POLICIES - Stock-Based Compensation (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>33</Position>
    </Report>
    <Report instance="kids-20190930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R34.htm</HtmlFileName>
      <LongName>2412407 - Disclosure - BUSINESS COMBINATION (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.orthopediatrics.com/role/BUSINESSCOMBINATIONDetails</Role>
      <ShortName>BUSINESS COMBINATION (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.orthopediatrics.com/role/BUSINESSCOMBINATIONTables</ParentRole>
      <Position>34</Position>
    </Report>
    <Report instance="kids-20190930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R35.htm</HtmlFileName>
      <LongName>2415408 - Disclosure - DISCONTINUED OPERATIONS (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.orthopediatrics.com/role/DISCONTINUEDOPERATIONSDetails</Role>
      <ShortName>DISCONTINUED OPERATIONS (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.orthopediatrics.com/role/DISCONTINUEDOPERATIONSTables</ParentRole>
      <Position>35</Position>
    </Report>
    <Report instance="kids-20190930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R36.htm</HtmlFileName>
      <LongName>2418409 - Disclosure - DEBT AND CREDIT ARRANGEMENTS - Schedule of Long-term Debt (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.orthopediatrics.com/role/DEBTANDCREDITARRANGEMENTSScheduleofLongtermDebtDetails</Role>
      <ShortName>DEBT AND CREDIT ARRANGEMENTS - Schedule of Long-term Debt (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>36</Position>
    </Report>
    <Report instance="kids-20190930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R37.htm</HtmlFileName>
      <LongName>2419410 - Disclosure - DEBT AND CREDIT ARRANGEMENTS - Narrative (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.orthopediatrics.com/role/DEBTANDCREDITARRANGEMENTSNarrativeDetails</Role>
      <ShortName>DEBT AND CREDIT ARRANGEMENTS - Narrative (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>37</Position>
    </Report>
    <Report instance="kids-20190930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R38.htm</HtmlFileName>
      <LongName>2421411 - Disclosure - STRATEGIC ARRANGEMENTS (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.orthopediatrics.com/role/STRATEGICARRANGEMENTSDetails</Role>
      <ShortName>STRATEGIC ARRANGEMENTS (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.orthopediatrics.com/role/STRATEGICARRANGEMENTS</ParentRole>
      <Position>38</Position>
    </Report>
    <Report instance="kids-20190930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R39.htm</HtmlFileName>
      <LongName>2423412 - Disclosure - INCOME TAXES (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.orthopediatrics.com/role/INCOMETAXESDetails</Role>
      <ShortName>INCOME TAXES (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.orthopediatrics.com/role/INCOMETAXES</ParentRole>
      <Position>39</Position>
    </Report>
    <Report instance="kids-20190930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R40.htm</HtmlFileName>
      <LongName>2426413 - Disclosure - STOCKHOLDERS' EQUITY - Stock Options (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.orthopediatrics.com/role/STOCKHOLDERSEQUITYStockOptionsDetails</Role>
      <ShortName>STOCKHOLDERS' EQUITY - Stock Options (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>40</Position>
    </Report>
    <Report instance="kids-20190930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R41.htm</HtmlFileName>
      <LongName>2427414 - Disclosure - STOCKHOLDERS' EQUITY - Restricted Stock (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.orthopediatrics.com/role/STOCKHOLDERSEQUITYRestrictedStockDetails</Role>
      <ShortName>STOCKHOLDERS' EQUITY - Restricted Stock (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>41</Position>
    </Report>
    <Report instance="kids-20190930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R42.htm</HtmlFileName>
      <LongName>2428415 - Disclosure - STOCKHOLDERS' EQUITY - Warrants (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.orthopediatrics.com/role/STOCKHOLDERSEQUITYWarrantsDetails</Role>
      <ShortName>STOCKHOLDERS' EQUITY - Warrants (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>42</Position>
    </Report>
    <Report instance="kids-20190930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R43.htm</HtmlFileName>
      <LongName>2431416 - Disclosure - NET LOSS PER SHARE - Reconciliation of basic and diluted net loss per share (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.orthopediatrics.com/role/NETLOSSPERSHAREReconciliationofbasicanddilutednetlosspershareDetails</Role>
      <ShortName>NET LOSS PER SHARE - Reconciliation of basic and diluted net loss per share (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>43</Position>
    </Report>
    <Report instance="kids-20190930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R44.htm</HtmlFileName>
      <LongName>2432417 - Disclosure - NET LOSS PER SHARE - Antidilutive Securities (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.orthopediatrics.com/role/NETLOSSPERSHAREAntidilutiveSecuritiesDetails</Role>
      <ShortName>NET LOSS PER SHARE - Antidilutive Securities (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>44</Position>
    </Report>
    <Report instance="kids-20190930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R45.htm</HtmlFileName>
      <LongName>2435418 - Disclosure - BUSINESS SEGMENT - Narrative (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.orthopediatrics.com/role/BUSINESSSEGMENTNarrativeDetails</Role>
      <ShortName>BUSINESS SEGMENT - Narrative (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>45</Position>
    </Report>
    <Report instance="kids-20190930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R46.htm</HtmlFileName>
      <LongName>2436419 - Disclosure - BUSINESS SEGMENT - Schedule of Revenue by Geographical Location (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.orthopediatrics.com/role/BUSINESSSEGMENTScheduleofRevenuebyGeographicalLocationDetails</Role>
      <ShortName>BUSINESS SEGMENT - Schedule of Revenue by Geographical Location (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>46</Position>
    </Report>
    <Report instance="kids-20190930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R47.htm</HtmlFileName>
      <LongName>2437420 - Disclosure - BUSINESS SEGMENT - Schedule of Revenue by Category (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.orthopediatrics.com/role/BUSINESSSEGMENTScheduleofRevenuebyCategoryDetails</Role>
      <ShortName>BUSINESS SEGMENT - Schedule of Revenue by Category (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>47</Position>
    </Report>
    <Report instance="kids-20190930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R48.htm</HtmlFileName>
      <LongName>2439421 - Disclosure - RELATED PARTY TRANSACTIONS (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.orthopediatrics.com/role/RELATEDPARTYTRANSACTIONSDetails</Role>
      <ShortName>RELATED PARTY TRANSACTIONS (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.orthopediatrics.com/role/RELATEDPARTYTRANSACTIONS</ParentRole>
      <Position>48</Position>
    </Report>
    <Report instance="kids-20190930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R49.htm</HtmlFileName>
      <LongName>2441422 - Disclosure - EMPLOYEE BENEFIT PLAN - Narrative (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.orthopediatrics.com/role/EMPLOYEEBENEFITPLANNarrativeDetails</Role>
      <ShortName>EMPLOYEE BENEFIT PLAN - Narrative (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>49</Position>
    </Report>
    <Report instance="kids-20190930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R50.htm</HtmlFileName>
      <LongName>2443423 - Disclosure - COMMITMENTS AND CONTINGENCIES (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.orthopediatrics.com/role/COMMITMENTSANDCONTINGENCIESDetails</Role>
      <ShortName>COMMITMENTS AND CONTINGENCIES (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.orthopediatrics.com/role/COMMITMENTSANDCONTINGENCIES</ParentRole>
      <Position>50</Position>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <LongName>All Reports</LongName>
      <ReportType>Book</ReportType>
      <ShortName>All Reports</ShortName>
    </Report>
  </MyReports>
  <InputFiles>
    <File doctype="10-Q" original="kids-20190930.htm">kids-20190930.htm</File>
    <File>exhibit311-ceocertific.htm</File>
    <File>exhibit312-cfocertific.htm</File>
    <File>exhibit321-ceocertific.htm</File>
    <File>exhibit322-cfocertific.htm</File>
    <File>kids-20190930.xsd</File>
    <File>kids-20190930_cal.xml</File>
    <File>kids-20190930_def.xml</File>
    <File>kids-20190930_lab.xml</File>
    <File>kids-20190930_pre.xml</File>
  </InputFiles>
  <SupplementalFiles/>
  <BaseTaxonomies>
    <BaseTaxonomy>http://xbrl.sec.gov/dei/2019-01-31</BaseTaxonomy>
    <BaseTaxonomy>http://fasb.org/srt/2019-01-31</BaseTaxonomy>
    <BaseTaxonomy>http://fasb.org/us-gaap/2019-01-31</BaseTaxonomy>
    <BaseTaxonomy>http://xbrl.sec.gov/country/2017-01-31</BaseTaxonomy>
  </BaseTaxonomies>
  <HasPresentationLinkbase>true</HasPresentationLinkbase>
  <HasCalculationLinkbase>true</HasCalculationLinkbase>
</FilingSummary>
