<?xml version='1.0' encoding='utf-8'?>
<FilingSummary>
  <Version>3.22.2</Version>
  <ProcessingTime/>
  <ReportFormat>html</ReportFormat>
  <ContextCount>173</ContextCount>
  <ElementCount>366</ElementCount>
  <EntityCount>1</EntityCount>
  <FootnotesReported>false</FootnotesReported>
  <SegmentCount>56</SegmentCount>
  <ScenarioCount>0</ScenarioCount>
  <TuplesReported>false</TuplesReported>
  <UnitCount>4</UnitCount>
  <MyReports>
    <Report instance="sien-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R1.htm</HtmlFileName>
      <LongName>100000 - Document - Document and Entity Information</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.sientra.com/20220630/taxonomy/role/Role_DocumentDocumentAndEntityInformation</Role>
      <ShortName>Document and Entity Information</ShortName>
      <MenuCategory>Cover</MenuCategory>
      <Position>1</Position>
    </Report>
    <Report instance="sien-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R2.htm</HtmlFileName>
      <LongName>100010 - Statement - Condensed Consolidated Balance Sheets</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.sientra.com/20220630/taxonomy/role/Role_StatementCondensedConsolidatedBalanceSheets</Role>
      <ShortName>Condensed Consolidated Balance Sheets</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>2</Position>
    </Report>
    <Report instance="sien-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R3.htm</HtmlFileName>
      <LongName>100020 - Statement - Condensed Consolidated Balance Sheets (Parenthetical)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.sientra.com/20220630/taxonomy/role/Role_StatementCondensedConsolidatedBalanceSheetsParenthetical</Role>
      <ShortName>Condensed Consolidated Balance Sheets (Parenthetical)</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>3</Position>
    </Report>
    <Report instance="sien-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R4.htm</HtmlFileName>
      <LongName>100040 - Statement - Condensed Consolidated Statements of Operations</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.sientra.com/20220630/taxonomy/role/Role_StatementCondensedConsolidatedStatementsOfOperations</Role>
      <ShortName>Condensed Consolidated Statements of Operations</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>4</Position>
    </Report>
    <Report instance="sien-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R5.htm</HtmlFileName>
      <LongName>100050 - Statement - Condensed Consolidated Statement of Stockholders' Equity (Deficit)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.sientra.com/20220630/taxonomy/role/Role_StatementCondensedConsolidatedStatementOfStockholdersEquityDeficit</Role>
      <ShortName>Condensed Consolidated Statement of Stockholders' Equity (Deficit)</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>5</Position>
    </Report>
    <Report instance="sien-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R6.htm</HtmlFileName>
      <LongName>100060 - Statement - Condensed Consolidated Statements of Cash Flows</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.sientra.com/20220630/taxonomy/role/Role_StatementCondensedConsolidatedStatementsOfCashFlows</Role>
      <ShortName>Condensed Consolidated Statements of Cash Flows</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>6</Position>
    </Report>
    <Report instance="sien-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R7.htm</HtmlFileName>
      <LongName>100070 - Disclosure - Summary of Significant Accounting Policies</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.sientra.com/20220630/taxonomy/role/Role_DisclosureSummaryOfSignificantAccountingPolicies</Role>
      <ShortName>Summary of Significant Accounting Policies</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>7</Position>
    </Report>
    <Report instance="sien-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R8.htm</HtmlFileName>
      <LongName>100080 - Disclosure - Discontinued Operations</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.sientra.com/20220630/taxonomy/role/Role_DisclosureDiscontinuedOperations</Role>
      <ShortName>Discontinued Operations</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>8</Position>
    </Report>
    <Report instance="sien-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R9.htm</HtmlFileName>
      <LongName>100090 - Disclosure - Revenue</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.sientra.com/20220630/taxonomy/role/Role_DisclosureRevenue</Role>
      <ShortName>Revenue</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>9</Position>
    </Report>
    <Report instance="sien-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R10.htm</HtmlFileName>
      <LongName>100100 - Disclosure - Fair Value of Financial Instruments</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.sientra.com/20220630/taxonomy/role/Role_DisclosureFairValueOfFinancialInstruments</Role>
      <ShortName>Fair Value of Financial Instruments</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>10</Position>
    </Report>
    <Report instance="sien-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R11.htm</HtmlFileName>
      <LongName>100110 - Disclosure - Balance Sheet Components</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.sientra.com/20220630/taxonomy/role/Role_DisclosureBalanceSheetComponents</Role>
      <ShortName>Balance Sheet Components</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>11</Position>
    </Report>
    <Report instance="sien-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R12.htm</HtmlFileName>
      <LongName>100120 - Disclosure - Leases</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.sientra.com/20220630/taxonomy/role/Role_DisclosureLeases</Role>
      <ShortName>Leases</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>12</Position>
    </Report>
    <Report instance="sien-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R13.htm</HtmlFileName>
      <LongName>100130 - Disclosure - Debt</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.sientra.com/20220630/taxonomy/role/Role_DisclosureDebt</Role>
      <ShortName>Debt</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>13</Position>
    </Report>
    <Report instance="sien-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R14.htm</HtmlFileName>
      <LongName>100140 - Disclosure - Stockholders' Equity</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.sientra.com/20220630/taxonomy/role/Role_DisclosureStockholdersEquity</Role>
      <ShortName>Stockholders' Equity</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>14</Position>
    </Report>
    <Report instance="sien-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R15.htm</HtmlFileName>
      <LongName>100150 - Disclosure - Net Loss Per Share</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.sientra.com/20220630/taxonomy/role/DisclosureNetLossPerShare</Role>
      <ShortName>Net Loss Per Share</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>15</Position>
    </Report>
    <Report instance="sien-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R16.htm</HtmlFileName>
      <LongName>100160 - Disclosure - Income Taxes</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.sientra.com/20220630/taxonomy/role/Role_DisclosureIncomeTaxes</Role>
      <ShortName>Income Taxes</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>16</Position>
    </Report>
    <Report instance="sien-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R17.htm</HtmlFileName>
      <LongName>100180 - Disclosure - Commitments and Contingencies</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.sientra.com/20220630/taxonomy/role/Role_DisclosureCommitmentsAndContingencies</Role>
      <ShortName>Commitments and Contingencies</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>17</Position>
    </Report>
    <Report instance="sien-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R18.htm</HtmlFileName>
      <LongName>100200 - Disclosure - Summary of Significant Accounting Policies (Policies)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.sientra.com/20220630/taxonomy/role/Role_DisclosureSummaryOfSignificantAccountingPoliciesPolicies</Role>
      <ShortName>Summary of Significant Accounting Policies (Policies)</ShortName>
      <MenuCategory>Policies</MenuCategory>
      <ParentRole>http://www.sientra.com/20220630/taxonomy/role/Role_DisclosureSummaryOfSignificantAccountingPolicies</ParentRole>
      <Position>18</Position>
    </Report>
    <Report instance="sien-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R19.htm</HtmlFileName>
      <LongName>100210 - Disclosure - Discontinued Operations (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.sientra.com/20220630/taxonomy/role/Role_DisclosureDiscontinuedOperationsTables</Role>
      <ShortName>Discontinued Operations (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.sientra.com/20220630/taxonomy/role/Role_DisclosureDiscontinuedOperations</ParentRole>
      <Position>19</Position>
    </Report>
    <Report instance="sien-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R20.htm</HtmlFileName>
      <LongName>100220 - Disclosure - Revenue (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.sientra.com/20220630/taxonomy/role/Role_DisclosureRevenueTables</Role>
      <ShortName>Revenue (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.sientra.com/20220630/taxonomy/role/Role_DisclosureRevenue</ParentRole>
      <Position>20</Position>
    </Report>
    <Report instance="sien-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R21.htm</HtmlFileName>
      <LongName>100230 - Disclosure - Fair Value of Financial Instruments (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.sientra.com/20220630/taxonomy/role/Role_DisclosureFairValueOfFinancialInstrumentsTables</Role>
      <ShortName>Fair Value of Financial Instruments (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.sientra.com/20220630/taxonomy/role/Role_DisclosureFairValueOfFinancialInstruments</ParentRole>
      <Position>21</Position>
    </Report>
    <Report instance="sien-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R22.htm</HtmlFileName>
      <LongName>100240 - Disclosure - Balance Sheet Components (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.sientra.com/20220630/taxonomy/role/Role_DisclosureBalanceSheetComponentsTables</Role>
      <ShortName>Balance Sheet Components (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.sientra.com/20220630/taxonomy/role/Role_DisclosureBalanceSheetComponents</ParentRole>
      <Position>22</Position>
    </Report>
    <Report instance="sien-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R23.htm</HtmlFileName>
      <LongName>100250 - Disclosure - Leases (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.sientra.com/20220630/taxonomy/role/Role_DisclosureLeasesTables</Role>
      <ShortName>Leases (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.sientra.com/20220630/taxonomy/role/Role_DisclosureLeases</ParentRole>
      <Position>23</Position>
    </Report>
    <Report instance="sien-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R24.htm</HtmlFileName>
      <LongName>100260 - Disclosure - Debt (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.sientra.com/20220630/taxonomy/role/Role_DisclosureDebtTables</Role>
      <ShortName>Debt (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.sientra.com/20220630/taxonomy/role/Role_DisclosureDebt</ParentRole>
      <Position>24</Position>
    </Report>
    <Report instance="sien-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R25.htm</HtmlFileName>
      <LongName>100270 - Disclosure - Stockholders' Equity (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.sientra.com/20220630/taxonomy/role/Role_DisclosureStockholdersEquityTables</Role>
      <ShortName>Stockholders' Equity (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.sientra.com/20220630/taxonomy/role/Role_DisclosureStockholdersEquity</ParentRole>
      <Position>25</Position>
    </Report>
    <Report instance="sien-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R26.htm</HtmlFileName>
      <LongName>100280 - Disclosure - Net Loss Per Share (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.sientra.com/20220630/taxonomy/role/DisclosureNetLossPerShareTables</Role>
      <ShortName>Net Loss Per Share (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.sientra.com/20220630/taxonomy/role/DisclosureNetLossPerShare</ParentRole>
      <Position>26</Position>
    </Report>
    <Report instance="sien-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R27.htm</HtmlFileName>
      <LongName>100290 - Disclosure - Summary of Significant Accounting Policies (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.sientra.com/20220630/taxonomy/role/Role_DisclosureSummaryOfSignificantAccountingPoliciesDetails</Role>
      <ShortName>Summary of Significant Accounting Policies (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.sientra.com/20220630/taxonomy/role/Role_DisclosureSummaryOfSignificantAccountingPoliciesPolicies</ParentRole>
      <Position>27</Position>
    </Report>
    <Report instance="sien-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R28.htm</HtmlFileName>
      <LongName>100300 - Disclosure - Discontinued Operations (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.sientra.com/20220630/taxonomy/role/Role_DisclosureDiscontinuedOperationsDetails</Role>
      <ShortName>Discontinued Operations (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.sientra.com/20220630/taxonomy/role/Role_DisclosureDiscontinuedOperationsTables</ParentRole>
      <Position>28</Position>
    </Report>
    <Report instance="sien-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R29.htm</HtmlFileName>
      <LongName>100310 - Disclosure - Discontinued Operations - Summary of Aggregate Carrying Amounts of Major Classes of Assets and Liabilities of Discontinued Operations (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.sientra.com/20220630/taxonomy/role/Role_DisclosureDiscontinuedOperationsSummaryOfAggregateCarryingAmountsOfMajorClassesOfAssetsAndLiabilitiesOfDiscontinuedOperationsDetails</Role>
      <ShortName>Discontinued Operations - Summary of Aggregate Carrying Amounts of Major Classes of Assets and Liabilities of Discontinued Operations (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>29</Position>
    </Report>
    <Report instance="sien-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R30.htm</HtmlFileName>
      <LongName>100320 - Disclosure - Discontinued Operations - Summary of Information Regarding the Results of Discontinued Operations (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.sientra.com/20220630/taxonomy/role/Role_DisclosureDiscontinuedOperationsSummaryOfInformationRegardingResultsOfDiscontinuedOperationsDetails</Role>
      <ShortName>Discontinued Operations - Summary of Information Regarding the Results of Discontinued Operations (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>30</Position>
    </Report>
    <Report instance="sien-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R31.htm</HtmlFileName>
      <LongName>100330 - Disclosure - Revenue (Details 1)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.sientra.com/20220630/taxonomy/role/DisclosureRevenueDetails1</Role>
      <ShortName>Revenue (Details 1)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.sientra.com/20220630/taxonomy/role/Role_DisclosureRevenueTables</ParentRole>
      <Position>31</Position>
    </Report>
    <Report instance="sien-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R32.htm</HtmlFileName>
      <LongName>100340 - Disclosure - Revenue (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.sientra.com/20220630/taxonomy/role/DisclosureRevenueDetails2</Role>
      <ShortName>Revenue (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.sientra.com/20220630/taxonomy/role/Role_DisclosureRevenueTables</ParentRole>
      <Position>32</Position>
    </Report>
    <Report instance="sien-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R33.htm</HtmlFileName>
      <LongName>100350 - Disclosure - Revenue - Schedule of Liability for Unsatisfied Performance Obligations Under Service Warranty and Deliverables Under Certain Marketing Programs (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.sientra.com/20220630/taxonomy/role/Role_DisclosureRevenueScheduleOfLiabilityForUnsatisfiedPerformanceObligationsUnderServiceWarrantyAndDeliverablesUnderCertainMarketingProgramsDetails</Role>
      <ShortName>Revenue - Schedule of Liability for Unsatisfied Performance Obligations Under Service Warranty and Deliverables Under Certain Marketing Programs (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>33</Position>
    </Report>
    <Report instance="sien-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R34.htm</HtmlFileName>
      <LongName>100360 - Disclosure - Revenue - Schedule of Rollforward of Sales Return Liability (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.sientra.com/20220630/taxonomy/role/Role_DisclosureRevenueScheduleOfRollforwardOfSalesReturnLiabilityDetails</Role>
      <ShortName>Revenue - Schedule of Rollforward of Sales Return Liability (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>34</Position>
    </Report>
    <Report instance="sien-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R35.htm</HtmlFileName>
      <LongName>100370 - Disclosure - Fair Value of Financial Instruments - Schedule of Carrying Value and Fair Value of Convertible Note (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.sientra.com/20220630/taxonomy/role/Role_DisclosureFairValueOfFinancialInstrumentsScheduleOfCarryingValueAndFairValueOfConvertibleNoteDetails</Role>
      <ShortName>Fair Value of Financial Instruments - Schedule of Carrying Value and Fair Value of Convertible Note (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>35</Position>
    </Report>
    <Report instance="sien-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R36.htm</HtmlFileName>
      <LongName>100380 - Disclosure - Balance Sheet Components (Inventories) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.sientra.com/20220630/taxonomy/role/Role_DisclosureBalanceSheetComponentsInventoriesDetails</Role>
      <ShortName>Balance Sheet Components (Inventories) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.sientra.com/20220630/taxonomy/role/Role_DisclosureBalanceSheetComponentsTables</ParentRole>
      <Position>36</Position>
    </Report>
    <Report instance="sien-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R37.htm</HtmlFileName>
      <LongName>100390 - Disclosure - Balance Sheet Components (PPE) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.sientra.com/20220630/taxonomy/role/Role_DisclosureBalanceSheetComponentsPPEDetails</Role>
      <ShortName>Balance Sheet Components (PPE) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.sientra.com/20220630/taxonomy/role/Role_DisclosureBalanceSheetComponentsTables</ParentRole>
      <Position>37</Position>
    </Report>
    <Report instance="sien-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R38.htm</HtmlFileName>
      <LongName>100400 - Disclosure - Balance Sheet Components - Schedule of Carrying Amount of Goodwill (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.sientra.com/20220630/taxonomy/role/Role_DisclosureBalanceSheetComponentsScheduleOfCarryingAmountOfGoodwillDetails</Role>
      <ShortName>Balance Sheet Components - Schedule of Carrying Amount of Goodwill (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>38</Position>
    </Report>
    <Report instance="sien-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R39.htm</HtmlFileName>
      <LongName>100410 - Disclosure - Balance Sheet Components - Components of Other Intangible Assets (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.sientra.com/20220630/taxonomy/role/Role_DisclosureBalanceSheetComponentsComponentsOfOtherIntangibleAssetsDetails</Role>
      <ShortName>Balance Sheet Components - Components of Other Intangible Assets (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>39</Position>
    </Report>
    <Report instance="sien-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R40.htm</HtmlFileName>
      <LongName>100420 - Disclosure - Balance Sheet Components (Goodwill and Other Intangible Assets) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.sientra.com/20220630/taxonomy/role/Role_DisclosureBalanceSheetComponentsGoodwillAndOtherIntangibleAssetsDetails</Role>
      <ShortName>Balance Sheet Components (Goodwill and Other Intangible Assets) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.sientra.com/20220630/taxonomy/role/Role_DisclosureBalanceSheetComponentsTables</ParentRole>
      <Position>40</Position>
    </Report>
    <Report instance="sien-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R41.htm</HtmlFileName>
      <LongName>100430 - Disclosure - Balance Sheet Components - Schedule of Future Estimated Amortization Expense (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.sientra.com/20220630/taxonomy/role/Role_DisclosureBalanceSheetComponentsScheduleOfFutureEstimatedAmortizationExpenseDetails</Role>
      <ShortName>Balance Sheet Components - Schedule of Future Estimated Amortization Expense (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>41</Position>
    </Report>
    <Report instance="sien-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R42.htm</HtmlFileName>
      <LongName>100440 - Disclosure - Balance Sheet Components (Accrued liabilities) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.sientra.com/20220630/taxonomy/role/Role_DisclosureBalanceSheetComponentsAccruedLiabilitiesDetails</Role>
      <ShortName>Balance Sheet Components (Accrued liabilities) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.sientra.com/20220630/taxonomy/role/Role_DisclosureBalanceSheetComponentsTables</ParentRole>
      <Position>42</Position>
    </Report>
    <Report instance="sien-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R43.htm</HtmlFileName>
      <LongName>100450 - Disclosure - Balance Sheet Components - Schedule of rollforward of the accrued assurance-type warranties (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.sientra.com/20220630/taxonomy/role/Role_DisclosureBalanceSheetComponentsScheduleOfRollforwardOfAccruedAssuranceTypeWarrantiesDetails</Role>
      <ShortName>Balance Sheet Components - Schedule of rollforward of the accrued assurance-type warranties (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>43</Position>
    </Report>
    <Report instance="sien-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R44.htm</HtmlFileName>
      <LongName>100460 - Disclosure - Balance Sheet Components (Liabilities measured at fair value) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.sientra.com/20220630/taxonomy/role/Role_DisclosureBalanceSheetComponentsLiabilitiesMeasuredAtFairValueDetails</Role>
      <ShortName>Balance Sheet Components (Liabilities measured at fair value) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.sientra.com/20220630/taxonomy/role/Role_DisclosureBalanceSheetComponentsTables</ParentRole>
      <Position>44</Position>
    </Report>
    <Report instance="sien-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R45.htm</HtmlFileName>
      <LongName>100470 - Disclosure - Balance Sheet Components - Schedule of Company's Liabilities that are Measured at Fair Value on a Recurring Basis (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.sientra.com/20220630/taxonomy/role/Role_DisclosureBalanceSheetComponentsScheduleOfCompanySLiabilitiesThatAreMeasuredAtFairValueOnRecurringBasisDetails</Role>
      <ShortName>Balance Sheet Components - Schedule of Company's Liabilities that are Measured at Fair Value on a Recurring Basis (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>45</Position>
    </Report>
    <Report instance="sien-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R46.htm</HtmlFileName>
      <LongName>100480 - Disclosure - Balance Sheet Components - Schedule of Aggregate Fair Values of Company's Liabilities for which Fair Value is Determined by Level 3 Inputs (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.sientra.com/20220630/taxonomy/role/Role_DisclosureBalanceSheetComponentsScheduleOfAggregateFairValuesOfCompanySLiabilitiesForWhichFairValueIsDeterminedByLevel3InputsDetails</Role>
      <ShortName>Balance Sheet Components - Schedule of Aggregate Fair Values of Company's Liabilities for which Fair Value is Determined by Level 3 Inputs (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>46</Position>
    </Report>
    <Report instance="sien-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R47.htm</HtmlFileName>
      <LongName>100490 - Disclosure - Leases - Components of Lease Expense (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.sientra.com/20220630/taxonomy/role/Role_DisclosureLeasesComponentsOfLeaseExpenseDetails</Role>
      <ShortName>Leases - Components of Lease Expense (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>47</Position>
    </Report>
    <Report instance="sien-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R48.htm</HtmlFileName>
      <LongName>100500 - Disclosure - Leases (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.sientra.com/20220630/taxonomy/role/Role_DisclosureLeasesDetails</Role>
      <ShortName>Leases (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.sientra.com/20220630/taxonomy/role/Role_DisclosureLeasesTables</ParentRole>
      <Position>48</Position>
    </Report>
    <Report instance="sien-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R49.htm</HtmlFileName>
      <LongName>100510 - Disclosure - Leases - Supplemental Cash Flow Information Related to Operating and Finance Leases (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.sientra.com/20220630/taxonomy/role/Role_DisclosureLeasesSupplementalCashFlowInformationRelatedToOperatingAndFinanceLeasesDetails</Role>
      <ShortName>Leases - Supplemental Cash Flow Information Related to Operating and Finance Leases (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>49</Position>
    </Report>
    <Report instance="sien-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R50.htm</HtmlFileName>
      <LongName>100520 - Disclosure - Leases - Supplemental Cash Flow Information Related to Operating and Finance Leases (Parenthetical) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.sientra.com/20220630/taxonomy/role/DisclosureLeasesSupplementalCashFlowInformationRelatedToOperatingAndFinanceLeasesParentheticalDetails</Role>
      <ShortName>Leases - Supplemental Cash Flow Information Related to Operating and Finance Leases (Parenthetical) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>50</Position>
    </Report>
    <Report instance="sien-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R51.htm</HtmlFileName>
      <LongName>100530 - Disclosure - Leases - Supplemental Balance Sheet Information Related to Operating and Finance Leases (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.sientra.com/20220630/taxonomy/role/Role_DisclosureLeasesSupplementalBalanceSheetInformationRelatedToOperatingAndFinanceLeasesDetails</Role>
      <ShortName>Leases - Supplemental Balance Sheet Information Related to Operating and Finance Leases (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>51</Position>
    </Report>
    <Report instance="sien-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R52.htm</HtmlFileName>
      <LongName>100540 - Disclosure - Leases - Maturities of Operating and Finance Lease Liabilities (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.sientra.com/20220630/taxonomy/role/Role_DisclosureLeasesMaturitiesOfOperatingAndFinanceLeaseLiabilitiesDetails</Role>
      <ShortName>Leases - Maturities of Operating and Finance Lease Liabilities (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>52</Position>
    </Report>
    <Report instance="sien-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R53.htm</HtmlFileName>
      <LongName>100550 - Disclosure - Debt (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.sientra.com/20220630/taxonomy/role/Role_DisclosureDebtDetails</Role>
      <ShortName>Debt (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.sientra.com/20220630/taxonomy/role/Role_DisclosureDebtTables</ParentRole>
      <Position>53</Position>
    </Report>
    <Report instance="sien-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R54.htm</HtmlFileName>
      <LongName>100570 - Disclosure - Debt (Schedule of Future Principal Payments of Outstanding Debt) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.sientra.com/20220630/taxonomy/role/Role_DisclosureDebtScheduleOfFuturePrincipalPaymentsOfOutstandingDebtDetails</Role>
      <ShortName>Debt (Schedule of Future Principal Payments of Outstanding Debt) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.sientra.com/20220630/taxonomy/role/Role_DisclosureDebtTables</ParentRole>
      <Position>54</Position>
    </Report>
    <Report instance="sien-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R55.htm</HtmlFileName>
      <LongName>100580 - Disclosure - Stockholders' Equity (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.sientra.com/20220630/taxonomy/role/Role_DisclosureStockholdersEquityDetails</Role>
      <ShortName>Stockholders' Equity (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.sientra.com/20220630/taxonomy/role/Role_DisclosureStockholdersEquityTables</ParentRole>
      <Position>55</Position>
    </Report>
    <Report instance="sien-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R56.htm</HtmlFileName>
      <LongName>100600 - Disclosure - Stockholders' Equity (Options) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.sientra.com/20220630/taxonomy/role/Role_DisclosureStockholdersEquityOptionsDetails</Role>
      <ShortName>Stockholders' Equity (Options) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.sientra.com/20220630/taxonomy/role/Role_DisclosureStockholdersEquityTables</ParentRole>
      <Position>56</Position>
    </Report>
    <Report instance="sien-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R57.htm</HtmlFileName>
      <LongName>100610 - Disclosure - Stockholders' Equity (Restricted Stock) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.sientra.com/20220630/taxonomy/role/Role_DisclosureStockholdersEquityRestrictedStockDetails</Role>
      <ShortName>Stockholders' Equity (Restricted Stock) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.sientra.com/20220630/taxonomy/role/Role_DisclosureStockholdersEquityTables</ParentRole>
      <Position>57</Position>
    </Report>
    <Report instance="sien-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R58.htm</HtmlFileName>
      <LongName>100620 - Disclosure - Stockholders' Equity (Stock Purchase) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.sientra.com/20220630/taxonomy/role/Role_DisclosureStockholdersEquityStockPurchaseDetails</Role>
      <ShortName>Stockholders' Equity (Stock Purchase) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.sientra.com/20220630/taxonomy/role/Role_DisclosureStockholdersEquityTables</ParentRole>
      <Position>58</Position>
    </Report>
    <Report instance="sien-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R59.htm</HtmlFileName>
      <LongName>100630 - Disclosure - Net Loss Per Share - Schedule of Net Loss Per Share, Basic and Diluted (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.sientra.com/20220630/taxonomy/role/DisclosureNetLossPerShareScheduleOfNetLossPerShareBasicAndDilutedDetails</Role>
      <ShortName>Net Loss Per Share - Schedule of Net Loss Per Share, Basic and Diluted (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>59</Position>
    </Report>
    <Report instance="sien-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R60.htm</HtmlFileName>
      <LongName>100640 - Disclosure - Net Loss Per Share - Schedule of Weighted Average Potentially Dilutive Securities Excluded from Computation of Diluted Net Loss Per Share Attributable to Common Stockholders (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.sientra.com/20220630/taxonomy/role/DisclosureNetLossPerShareScheduleOfWeightedAveragePotentiallyDilutiveSecuritiesExcludedFromComputationOfDilutedNetLossPerShareAttributabl</Role>
      <ShortName>Net Loss Per Share - Schedule of Weighted Average Potentially Dilutive Securities Excluded from Computation of Diluted Net Loss Per Share Attributable to Common Stockholders (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>60</Position>
    </Report>
    <Report instance="sien-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R61.htm</HtmlFileName>
      <LongName>100650 - Disclosure - Income Taxes (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.sientra.com/20220630/taxonomy/role/Role_DisclosureIncomeTaxesDetails</Role>
      <ShortName>Income Taxes (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.sientra.com/20220630/taxonomy/role/Role_DisclosureIncomeTaxes</ParentRole>
      <Position>61</Position>
    </Report>
    <Report instance="sien-20220630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R62.htm</HtmlFileName>
      <LongName>100660 - Disclosure - Commitments and Contingencies (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.sientra.com/20220630/taxonomy/role/DisclosureCommitmentsAndContingenciesDetails</Role>
      <ShortName>Commitments and Contingencies (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.sientra.com/20220630/taxonomy/role/Role_DisclosureCommitmentsAndContingencies</ParentRole>
      <Position>62</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="sien-20220630.htm">sien-20220630.htm</File>
    <File>sien-20220630.xsd</File>
    <File>sien-20220630_cal.xml</File>
    <File>sien-20220630_def.xml</File>
    <File>sien-20220630_lab.xml</File>
    <File>sien-20220630_pre.xml</File>
    <File>sien-ex31_1.htm</File>
    <File>sien-ex31_2.htm</File>
    <File>sien-ex32_1.htm</File>
    <File>sien-ex32_2.htm</File>
  </InputFiles>
  <SupplementalFiles/>
  <BaseTaxonomies>
    <BaseTaxonomy items="809">http://fasb.org/us-gaap/2022</BaseTaxonomy>
    <BaseTaxonomy items="30">http://xbrl.sec.gov/dei/2022</BaseTaxonomy>
  </BaseTaxonomies>
  <HasPresentationLinkbase>true</HasPresentationLinkbase>
  <HasCalculationLinkbase>true</HasCalculationLinkbase>
</FilingSummary>
