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            <endDate>2020-09-30</endDate>
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            <endDate>2020-09-30</endDate>
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    </context>
    <dei:AmendmentFlag
      contextRef="c20200930to20200930"
      id="Fact_3b9dbc92e2f44d62bb8cecafebd76d75">false</dei:AmendmentFlag>
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      contextRef="c20200930to20200930"
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      contextRef="c20200930to20200930"
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      contextRef="c20200930to20200930"
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      contextRef="c20200930to20200930"
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      contextRef="c20200930to20200930"
      id="Fact_bb360fe9415842a3a0e1d4115bfcbf65">DE</dei:EntityIncorporationStateCountryCode>
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      contextRef="c20200930to20200930"
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      contextRef="c20200930to20200930"
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      contextRef="c20200930to20200930"
      id="Fact_d5505abc2ce04c1382170ec95e054c3b">The Woodlands</dei:EntityAddressCityOrTown>
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      contextRef="c20200930to20200930"
      id="Fact_8d9284dcf3404b88b593810cb654fed7">800</dei:CityAreaCode>
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      contextRef="c20200930to20200930"
      id="Fact_019851f44c564890a54fd20f75a15d9e">832-4242</dei:LocalPhoneNumber>
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      contextRef="c20200930to20200930"
      id="Fact_9d279961d4ae4f058ff82f70da0f5351">false</dei:WrittenCommunications>
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      contextRef="c20200930to20200930"
      id="Fact_41e397178d0e4bbfa502394e73cf1803">false</dei:SolicitingMaterial>
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      contextRef="c20200930to20200930"
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      contextRef="c20200930to20200930_StatementClassOfStockAxis_CommonStockMember"
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      contextRef="c20200930to20200930_StatementClassOfStockAxis_CommonStockMember"
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    <dei:SecurityExchangeName
      contextRef="c20200930to20200930_StatementClassOfStockAxis_CommonStockMember"
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      contextRef="c20200930to20200930_StatementClassOfStockAxis_WarrantsToPurchaseCommonStockMember"
      id="Fact_8085000239f94d5bb5ba4b78b5956f13">Warrants to purchase common stock</dei:Security12bTitle>
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      contextRef="c20200930to20200930_StatementClassOfStockAxis_WarrantsToPurchaseCommonStockMember"
      id="Fact_68c0e7adb843485dab452ec0ce918440">THWWW</dei:TradingSymbol>
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