<?xml version='1.0' encoding='utf-8'?>
<FilingSummary>
  <Version>3.22.1</Version>
  <ProcessingTime/>
  <ReportFormat>html</ReportFormat>
  <ContextCount>177</ContextCount>
  <ElementCount>275</ElementCount>
  <EntityCount>1</EntityCount>
  <FootnotesReported>false</FootnotesReported>
  <SegmentCount>59</SegmentCount>
  <ScenarioCount>0</ScenarioCount>
  <TuplesReported>false</TuplesReported>
  <UnitCount>8</UnitCount>
  <MyReports>
    <Report instance="vray-20220331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R1.htm</HtmlFileName>
      <LongName>0001001 - Document - Cover</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://viewray.com/role/Cover</Role>
      <ShortName>Cover</ShortName>
      <MenuCategory>Cover</MenuCategory>
      <Position>1</Position>
    </Report>
    <Report instance="vray-20220331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R2.htm</HtmlFileName>
      <LongName>1001002 - Statement - Condensed Consolidated Balance Sheets</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://viewray.com/role/CondensedConsolidatedBalanceSheets</Role>
      <ShortName>Condensed Consolidated Balance Sheets</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>2</Position>
    </Report>
    <Report instance="vray-20220331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R3.htm</HtmlFileName>
      <LongName>1003003 - Statement - Condensed Consolidated Statements of Operations and Comprehensive Loss (Statement)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://viewray.com/role/CondensedConsolidatedStatementsofOperationsandComprehensiveLossStatement</Role>
      <ShortName>Condensed Consolidated Statements of Operations and Comprehensive Loss (Statement)</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>3</Position>
    </Report>
    <Report instance="vray-20220331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R4.htm</HtmlFileName>
      <LongName>1004004 - Statement - Condensed Consolidated Statements of Stockholders??? Equity</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://viewray.com/role/CondensedConsolidatedStatementsofStockholdersEquity</Role>
      <ShortName>Condensed Consolidated Statements of Stockholders??? Equity</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>4</Position>
    </Report>
    <Report instance="vray-20220331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R5.htm</HtmlFileName>
      <LongName>1006005 - Statement - Condensed Consolidated Statements of Cash Flows (Statement)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://viewray.com/role/CondensedConsolidatedStatementsofCashFlowsStatement</Role>
      <ShortName>Condensed Consolidated Statements of Cash Flows (Statement)</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>5</Position>
    </Report>
    <Report instance="vray-20220331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R6.htm</HtmlFileName>
      <LongName>1402401 - Statement - Condensed Consolidated Balance Sheets (Parenthetical)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://viewray.com/role/CondensedConsolidatedBalanceSheetsParenthetical</Role>
      <ShortName>Condensed Consolidated Balance Sheets (Parenthetical)</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>6</Position>
    </Report>
    <Report instance="vray-20220331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R7.htm</HtmlFileName>
      <LongName>1405402 - Statement - Condensed Consolidated Statements of Stockholders??? Equity (Parenthetical)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://viewray.com/role/CondensedConsolidatedStatementsofStockholdersEquityParenthetical</Role>
      <ShortName>Condensed Consolidated Statements of Stockholders??? Equity (Parenthetical)</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>7</Position>
    </Report>
    <Report instance="vray-20220331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R8.htm</HtmlFileName>
      <LongName>2101101 - Disclosure - BACKGROUND AND ORGANIZATION</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://viewray.com/role/BACKGROUNDANDORGANIZATION</Role>
      <ShortName>BACKGROUND AND ORGANIZATION</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>8</Position>
    </Report>
    <Report instance="vray-20220331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R9.htm</HtmlFileName>
      <LongName>2103102 - Disclosure - SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://viewray.com/role/SUMMARYOFSIGNIFICANTACCOUNTINGPOLICIES</Role>
      <ShortName>SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>9</Position>
    </Report>
    <Report instance="vray-20220331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R10.htm</HtmlFileName>
      <LongName>2105103 - Disclosure - BALANCE SHEET COMPONENTS</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://viewray.com/role/BALANCESHEETCOMPONENTS</Role>
      <ShortName>BALANCE SHEET COMPONENTS</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>10</Position>
    </Report>
    <Report instance="vray-20220331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R11.htm</HtmlFileName>
      <LongName>2112104 - Disclosure - FAIR VALUE OF FINANCIAL INSTRUMENTS</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://viewray.com/role/FAIRVALUEOFFINANCIALINSTRUMENTS</Role>
      <ShortName>FAIR VALUE OF FINANCIAL INSTRUMENTS</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>11</Position>
    </Report>
    <Report instance="vray-20220331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R12.htm</HtmlFileName>
      <LongName>2117105 - Disclosure - DEBT</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://viewray.com/role/DEBT</Role>
      <ShortName>DEBT</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>12</Position>
    </Report>
    <Report instance="vray-20220331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R13.htm</HtmlFileName>
      <LongName>2121106 - Disclosure - COMMITMENTS AND CONTINGENCIES</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://viewray.com/role/COMMITMENTSANDCONTINGENCIES</Role>
      <ShortName>COMMITMENTS AND CONTINGENCIES</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>13</Position>
    </Report>
    <Report instance="vray-20220331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R14.htm</HtmlFileName>
      <LongName>2123107 - Disclosure - REVENUE</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://viewray.com/role/REVENUE</Role>
      <ShortName>REVENUE</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>14</Position>
    </Report>
    <Report instance="vray-20220331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R15.htm</HtmlFileName>
      <LongName>2127108 - Disclosure - EQUITY FINANCING</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://viewray.com/role/EQUITYFINANCING</Role>
      <ShortName>EQUITY FINANCING</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>15</Position>
    </Report>
    <Report instance="vray-20220331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R16.htm</HtmlFileName>
      <LongName>2129109 - Disclosure - WARRANTS</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://viewray.com/role/WARRANTS</Role>
      <ShortName>WARRANTS</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>16</Position>
    </Report>
    <Report instance="vray-20220331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R17.htm</HtmlFileName>
      <LongName>2134110 - Disclosure - STOCK-BASED COMPENSATION</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://viewray.com/role/STOCKBASEDCOMPENSATION</Role>
      <ShortName>STOCK-BASED COMPENSATION</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>17</Position>
    </Report>
    <Report instance="vray-20220331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R18.htm</HtmlFileName>
      <LongName>2140111 - Disclosure - INCOME TAX</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://viewray.com/role/INCOMETAX</Role>
      <ShortName>INCOME TAX</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>18</Position>
    </Report>
    <Report instance="vray-20220331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R19.htm</HtmlFileName>
      <LongName>2142112 - Disclosure - NET LOSS PER SHARE</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://viewray.com/role/NETLOSSPERSHARE</Role>
      <ShortName>NET LOSS PER SHARE</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>19</Position>
    </Report>
    <Report instance="vray-20220331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R20.htm</HtmlFileName>
      <LongName>2145113 - Disclosure - RELATED PARTY TRANSACTIONS</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://viewray.com/role/RELATEDPARTYTRANSACTIONS</Role>
      <ShortName>RELATED PARTY TRANSACTIONS</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>20</Position>
    </Report>
    <Report instance="vray-20220331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R21.htm</HtmlFileName>
      <LongName>2204201 - Disclosure - SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Policies)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://viewray.com/role/SUMMARYOFSIGNIFICANTACCOUNTINGPOLICIESPolicies</Role>
      <ShortName>SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Policies)</ShortName>
      <MenuCategory>Policies</MenuCategory>
      <Position>21</Position>
    </Report>
    <Report instance="vray-20220331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R22.htm</HtmlFileName>
      <LongName>2306301 - Disclosure - BALANCE SHEET COMPONENTS (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://viewray.com/role/BALANCESHEETCOMPONENTSTables</Role>
      <ShortName>BALANCE SHEET COMPONENTS (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://viewray.com/role/BALANCESHEETCOMPONENTS</ParentRole>
      <Position>22</Position>
    </Report>
    <Report instance="vray-20220331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R23.htm</HtmlFileName>
      <LongName>2313302 - Disclosure - FAIR VALUE OF FINANCIAL INSTRUMENTS (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://viewray.com/role/FAIRVALUEOFFINANCIALINSTRUMENTSTables</Role>
      <ShortName>FAIR VALUE OF FINANCIAL INSTRUMENTS (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://viewray.com/role/FAIRVALUEOFFINANCIALINSTRUMENTS</ParentRole>
      <Position>23</Position>
    </Report>
    <Report instance="vray-20220331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R24.htm</HtmlFileName>
      <LongName>2318303 - Disclosure - DEBT (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://viewray.com/role/DEBTTables</Role>
      <ShortName>DEBT (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://viewray.com/role/DEBT</ParentRole>
      <Position>24</Position>
    </Report>
    <Report instance="vray-20220331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R25.htm</HtmlFileName>
      <LongName>2324304 - Disclosure - REVENUE (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://viewray.com/role/REVENUETables</Role>
      <ShortName>REVENUE (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://viewray.com/role/REVENUE</ParentRole>
      <Position>25</Position>
    </Report>
    <Report instance="vray-20220331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R26.htm</HtmlFileName>
      <LongName>2330305 - Disclosure - WARRANTS (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://viewray.com/role/WARRANTSTables</Role>
      <ShortName>WARRANTS (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://viewray.com/role/WARRANTS</ParentRole>
      <Position>26</Position>
    </Report>
    <Report instance="vray-20220331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R27.htm</HtmlFileName>
      <LongName>2335306 - Disclosure - STOCK-BASED COMPENSATION (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://viewray.com/role/STOCKBASEDCOMPENSATIONTables</Role>
      <ShortName>STOCK-BASED COMPENSATION (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://viewray.com/role/STOCKBASEDCOMPENSATION</ParentRole>
      <Position>27</Position>
    </Report>
    <Report instance="vray-20220331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R28.htm</HtmlFileName>
      <LongName>2343307 - Disclosure - NET LOSS PER SHARE (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://viewray.com/role/NETLOSSPERSHARETables</Role>
      <ShortName>NET LOSS PER SHARE (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://viewray.com/role/NETLOSSPERSHARE</ParentRole>
      <Position>28</Position>
    </Report>
    <Report instance="vray-20220331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R29.htm</HtmlFileName>
      <LongName>2402403 - Disclosure - BACKGROUND AND ORGANIZATION (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://viewray.com/role/BACKGROUNDANDORGANIZATIONDetails</Role>
      <ShortName>BACKGROUND AND ORGANIZATION (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://viewray.com/role/BACKGROUNDANDORGANIZATION</ParentRole>
      <Position>29</Position>
    </Report>
    <Report instance="vray-20220331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R30.htm</HtmlFileName>
      <LongName>2407404 - Disclosure - BALANCE SHEET COMPONENTS - Schedule of Property and Equipment, Net (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://viewray.com/role/BALANCESHEETCOMPONENTSScheduleofPropertyandEquipmentNetDetails</Role>
      <ShortName>BALANCE SHEET COMPONENTS - Schedule of Property and Equipment, Net (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>30</Position>
    </Report>
    <Report instance="vray-20220331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R31.htm</HtmlFileName>
      <LongName>2408405 - Disclosure - BALANCE SHEET COMPONENTS - Narrative (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://viewray.com/role/BALANCESHEETCOMPONENTSNarrativeDetails</Role>
      <ShortName>BALANCE SHEET COMPONENTS - Narrative (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>31</Position>
    </Report>
    <Report instance="vray-20220331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R32.htm</HtmlFileName>
      <LongName>2409406 - Disclosure - BALANCE SHEET COMPONENTS - Schedule of Accrued Liabilities (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://viewray.com/role/BALANCESHEETCOMPONENTSScheduleofAccruedLiabilitiesDetails</Role>
      <ShortName>BALANCE SHEET COMPONENTS - Schedule of Accrued Liabilities (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>32</Position>
    </Report>
    <Report instance="vray-20220331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R33.htm</HtmlFileName>
      <LongName>2410407 - Disclosure - BALANCE SHEET COMPONENTS - Schedule of Deferred Revenue (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://viewray.com/role/BALANCESHEETCOMPONENTSScheduleofDeferredRevenueDetails</Role>
      <ShortName>BALANCE SHEET COMPONENTS - Schedule of Deferred Revenue (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>33</Position>
    </Report>
    <Report instance="vray-20220331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R34.htm</HtmlFileName>
      <LongName>2411408 - Disclosure - BALANCE SHEET COMPONENTS - Schedule of Other Long-Term Liabilities (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://viewray.com/role/BALANCESHEETCOMPONENTSScheduleofOtherLongTermLiabilitiesDetails</Role>
      <ShortName>BALANCE SHEET COMPONENTS - Schedule of Other Long-Term Liabilities (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>34</Position>
    </Report>
    <Report instance="vray-20220331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R35.htm</HtmlFileName>
      <LongName>2414409 - Disclosure - FAIR VALUE OF FINANCIAL INSTRUMENTS - Narrative (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://viewray.com/role/FAIRVALUEOFFINANCIALINSTRUMENTSNarrativeDetails</Role>
      <ShortName>FAIR VALUE OF FINANCIAL INSTRUMENTS - Narrative (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>35</Position>
    </Report>
    <Report instance="vray-20220331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R36.htm</HtmlFileName>
      <LongName>2415410 - Disclosure - FAIR VALUE OF FINANCIAL INSTRUMENTS - Schedule of Fair Value of Financial Liabilities (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://viewray.com/role/FAIRVALUEOFFINANCIALINSTRUMENTSScheduleofFairValueofFinancialLiabilitiesDetails</Role>
      <ShortName>FAIR VALUE OF FINANCIAL INSTRUMENTS - Schedule of Fair Value of Financial Liabilities (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>36</Position>
    </Report>
    <Report instance="vray-20220331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R37.htm</HtmlFileName>
      <LongName>2416411 - Disclosure - FAIR VALUE OF FINANCIAL INSTRUMENTS - Summary of Changes in Fair Value of Level 3 Financial Liabilities (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://viewray.com/role/FAIRVALUEOFFINANCIALINSTRUMENTSSummaryofChangesinFairValueofLevel3FinancialLiabilitiesDetails</Role>
      <ShortName>FAIR VALUE OF FINANCIAL INSTRUMENTS - Summary of Changes in Fair Value of Level 3 Financial Liabilities (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>37</Position>
    </Report>
    <Report instance="vray-20220331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R38.htm</HtmlFileName>
      <LongName>2419412 - Disclosure - DEBT - Narrative (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://viewray.com/role/DEBTNarrativeDetails</Role>
      <ShortName>DEBT - Narrative (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>38</Position>
    </Report>
    <Report instance="vray-20220331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R39.htm</HtmlFileName>
      <LongName>2420413 - Disclosure - DEBT - Scheduled Future Payments on Term Loan (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://viewray.com/role/DEBTScheduledFuturePaymentsonTermLoanDetails</Role>
      <ShortName>DEBT - Scheduled Future Payments on Term Loan (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>39</Position>
    </Report>
    <Report instance="vray-20220331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R40.htm</HtmlFileName>
      <LongName>2422414 - Disclosure - COMMITMENTS AND CONTINGENCIES - Additional Information (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://viewray.com/role/COMMITMENTSANDCONTINGENCIESAdditionalInformationDetail</Role>
      <ShortName>COMMITMENTS AND CONTINGENCIES - Additional Information (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>40</Position>
    </Report>
    <Report instance="vray-20220331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R41.htm</HtmlFileName>
      <LongName>2425415 - Disclosure - REVENUE - Summary of Revenue Disaggregated by Types and Geography (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://viewray.com/role/REVENUESummaryofRevenueDisaggregatedbyTypesandGeographyDetail</Role>
      <ShortName>REVENUE - Summary of Revenue Disaggregated by Types and Geography (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>41</Position>
    </Report>
    <Report instance="vray-20220331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R42.htm</HtmlFileName>
      <LongName>2426416 - Disclosure - REVENUE - Additional Information (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://viewray.com/role/REVENUEAdditionalInformationDetail</Role>
      <ShortName>REVENUE - Additional Information (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>42</Position>
    </Report>
    <Report instance="vray-20220331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R43.htm</HtmlFileName>
      <LongName>2428417 - Disclosure - EQUITY FINANCING - Additional Information (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://viewray.com/role/EQUITYFINANCINGAdditionalInformationDetail</Role>
      <ShortName>EQUITY FINANCING - Additional Information (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>43</Position>
    </Report>
    <Report instance="vray-20220331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R44.htm</HtmlFileName>
      <LongName>2431418 - Disclosure - WARRANTS - Additional Information (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://viewray.com/role/WARRANTSAdditionalInformationDetail</Role>
      <ShortName>WARRANTS - Additional Information (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>44</Position>
    </Report>
    <Report instance="vray-20220331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R45.htm</HtmlFileName>
      <LongName>2432419 - Disclosure - WARRANTS - Summary of Assumptions to Use Option Pricing Model (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://viewray.com/role/WARRANTSSummaryofAssumptionstoUseOptionPricingModelDetail</Role>
      <ShortName>WARRANTS - Summary of Assumptions to Use Option Pricing Model (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>45</Position>
    </Report>
    <Report instance="vray-20220331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R46.htm</HtmlFileName>
      <LongName>2433420 - Disclosure - WARRANTS - Schedule of Key Terms of Placement Warrants (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://viewray.com/role/WARRANTSScheduleofKeyTermsofPlacementWarrantsDetail</Role>
      <ShortName>WARRANTS - Schedule of Key Terms of Placement Warrants (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>46</Position>
    </Report>
    <Report instance="vray-20220331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R47.htm</HtmlFileName>
      <LongName>2436421 - Disclosure - STOCK-BASED COMPENSATION - Additional Information (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://viewray.com/role/STOCKBASEDCOMPENSATIONAdditionalInformationDetails</Role>
      <ShortName>STOCK-BASED COMPENSATION - Additional Information (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>47</Position>
    </Report>
    <Report instance="vray-20220331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R48.htm</HtmlFileName>
      <LongName>2437422 - Disclosure - STOCK-BASED COMPENSATION - Summary of Stock-Based Compensation Expense (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://viewray.com/role/STOCKBASEDCOMPENSATIONSummaryofStockBasedCompensationExpenseDetails</Role>
      <ShortName>STOCK-BASED COMPENSATION - Summary of Stock-Based Compensation Expense (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>48</Position>
    </Report>
    <Report instance="vray-20220331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R49.htm</HtmlFileName>
      <LongName>2438423 - Disclosure - STOCK-BASED COMPENSATION - Summary of Incentive Stock Units (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://viewray.com/role/STOCKBASEDCOMPENSATIONSummaryofIncentiveStockUnitsDetails</Role>
      <ShortName>STOCK-BASED COMPENSATION - Summary of Incentive Stock Units (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>49</Position>
    </Report>
    <Report instance="vray-20220331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R50.htm</HtmlFileName>
      <LongName>2439424 - Disclosure - STOCK-BASED COMPENSATION - Summary of Company's Stock Option Activity and Related Information (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://viewray.com/role/STOCKBASEDCOMPENSATIONSummaryofCompanysStockOptionActivityandRelatedInformationDetails</Role>
      <ShortName>STOCK-BASED COMPENSATION - Summary of Company's Stock Option Activity and Related Information (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>50</Position>
    </Report>
    <Report instance="vray-20220331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R51.htm</HtmlFileName>
      <LongName>2441425 - Disclosure - INCOME TAX - Additional Information (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://viewray.com/role/INCOMETAXAdditionalInformationDetail</Role>
      <ShortName>INCOME TAX - Additional Information (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>51</Position>
    </Report>
    <Report instance="vray-20220331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R52.htm</HtmlFileName>
      <LongName>2444426 - Disclosure - NET LOSS PER SHARE - Dilutive Securities Excluded from Calculation of Diluted Earnings Per Share (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://viewray.com/role/NETLOSSPERSHAREDilutiveSecuritiesExcludedfromCalculationofDilutedEarningsPerShareDetail</Role>
      <ShortName>NET LOSS PER SHARE - Dilutive Securities Excluded from Calculation of Diluted Earnings Per Share (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>52</Position>
    </Report>
    <Report instance="vray-20220331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R53.htm</HtmlFileName>
      <LongName>2446427 - Disclosure - RELATED PARTY TRANSACTIONS - Additional Information (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://viewray.com/role/RELATEDPARTYTRANSACTIONSAdditionalInformationDetail</Role>
      <ShortName>RELATED PARTY TRANSACTIONS - Additional Information (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>53</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="vray-20220331.htm">vray-20220331.htm</File>
    <File>exhibit103.htm</File>
    <File>exhibit311q12022.htm</File>
    <File>exhibit312q12022.htm</File>
    <File>exhibit321q12022.htm</File>
    <File>vray-20220331.xsd</File>
    <File>vray-20220331_cal.xml</File>
    <File>vray-20220331_def.xml</File>
    <File>vray-20220331_lab.xml</File>
    <File>vray-20220331_pre.xml</File>
  </InputFiles>
  <SupplementalFiles>
    <File>vray-20220331_g1.jpg</File>
  </SupplementalFiles>
  <BaseTaxonomies>
    <BaseTaxonomy items="554">http://fasb.org/us-gaap/2021-01-31</BaseTaxonomy>
    <BaseTaxonomy items="29">http://xbrl.sec.gov/dei/2021q4</BaseTaxonomy>
  </BaseTaxonomies>
  <HasPresentationLinkbase>true</HasPresentationLinkbase>
  <HasCalculationLinkbase>true</HasCalculationLinkbase>
</FilingSummary>
