<?xml version="1.0" encoding="us-ascii"?><InstanceReport xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"><Version>2.4.0.8</Version><ReportLongName>0011 - Disclosure - 4. Property and Equipment, net</ReportLongName><DisplayLabelColumn>true</DisplayLabelColumn><ShowElementNames>false</ShowElementNames><RoundingOption /><HasEmbeddedReports>false</HasEmbeddedReports><Columns><Column FlagID="0"><Id>1</Id><IsAbstractGroupTitle>false</IsAbstractGroupTitle><LabelSeparator>

</LabelSeparator><CurrencyCode /><FootnoteIndexer /><hasSegments>false</hasSegments><hasScenarios>false</hasScenarios><MCU><KeyName /><CurrencySymbol /><contextRef><ContextID>From2013-01-01to2013-06-30</ContextID><EntitySchema>http://www.sec.gov/CIK</EntitySchema><EntityValue>0000225211</EntityValue><PeriodDisplayName /><PeriodType>duration</PeriodType><PeriodStartDate>2013-01-01T00:00:00</PeriodStartDate><PeriodEndDate>2013-06-30T00:00:00</PeriodEndDate><Segments /><Scenarios /></contextRef><UPS /><CurrencyCode /><OriginalCurrencyCode /></MCU><CurrencySymbol /><Labels><Label Key="CalendarSupplement" Id="0" Label="6 Months Ended" /><Label Key="Calendar" Id="1" Label="Jun. 30, 2013" /></Labels></Column></Columns><Rows><Row FlagID="0"><Id>1</Id><IsAbstractGroupTitle>true</IsAbstractGroupTitle><LabelSeparator>

</LabelSeparator><Level>1</Level><ElementName>us-gaap_PropertyPlantAndEquipmentAbstract</ElementName><ElementPrefix>us-gaap_</ElementPrefix><IsBaseElement>true</IsBaseElement><BalanceType>na</BalanceType><PeriodType>duration</PeriodType><IsReportTitle>false</IsReportTitle><IsSegmentTitle>false</IsSegmentTitle><IsCalendarTitle>false</IsCalendarTitle><IsEquityPrevioslyReportedAsRow>false</IsEquityPrevioslyReportedAsRow><IsEquityAdjustmentRow>false</IsEquityAdjustmentRow><IsBeginningBalance>false</IsBeginningBalance><IsEndingBalance>false</IsEndingBalance><IsReverseSign>false</IsReverseSign><FootnoteIndexer /><Cells><Cell FlagID="0" ContextID="" UnitID=""><Id>1</Id><IsNumeric>false</IsNumeric><IsRatio>false</IsRatio><DisplayZeroAsNone>false</DisplayZeroAsNone><NumericAmount>0</NumericAmount><RoundedNumericAmount>0</RoundedNumericAmount><NonNumbericText /><FootnoteIndexer /><CurrencyCode /><CurrencySymbol /><IsIndependantCurrency>false</IsIndependantCurrency><ShowCurrencySymbol>false</ShowCurrencySymbol><DisplayDateInUSFormat>false</DisplayDateInUSFormat></Cell></Cells><ElementDataType>xbrli:stringItemType</ElementDataType><SimpleDataType>string</SimpleDataType><IsTotalLabel>false</IsTotalLabel><UnitID>0</UnitID><Label>Property, Plant and Equipment [Abstract]</Label></Row><Row FlagID="0"><Id>2</Id><IsAbstractGroupTitle>false</IsAbstractGroupTitle><LabelSeparator>

</LabelSeparator><Level>2</Level><ElementName>us-gaap_PropertyPlantAndEquipmentDisclosureTextBlock</ElementName><ElementPrefix>us-gaap_</ElementPrefix><IsBaseElement>true</IsBaseElement><BalanceType>na</BalanceType><PeriodType>duration</PeriodType><IsReportTitle>false</IsReportTitle><IsSegmentTitle>false</IsSegmentTitle><IsCalendarTitle>false</IsCalendarTitle><IsEquityPrevioslyReportedAsRow>false</IsEquityPrevioslyReportedAsRow><IsEquityAdjustmentRow>false</IsEquityAdjustmentRow><IsBeginningBalance>false</IsBeginningBalance><IsEndingBalance>false</IsEndingBalance><IsReverseSign>false</IsReverseSign><FootnoteIndexer /><Cells><Cell FlagID="0" ContextID="From2013-01-01to2013-06-30" UnitID=""><Id>1</Id><IsNumeric>false</IsNumeric><IsRatio>false</IsRatio><DisplayZeroAsNone>false</DisplayZeroAsNone><NumericAmount>0</NumericAmount><RoundedNumericAmount>0</RoundedNumericAmount><NonNumbericText>&lt;p style="font: 8pt/normal Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;font style="font: 8pt Times New Roman, Times, Serif"&gt;Property
and equipment consist of the following: &lt;i&gt;(in thousands)&lt;/i&gt;&lt;/font&gt;&lt;/p&gt;

&lt;p style="font: 8pt/normal Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;font style="font: 8pt Times New Roman, Times, Serif"&gt;&amp;#160;&lt;/font&gt;&lt;/p&gt;

&lt;table cellpadding="0" cellspacing="0" style="border-collapse: collapse; width: 100%; font: 8pt Times New Roman, Times, Serif"&gt;
&lt;tr style="vertical-align: bottom; font: 8pt Times New Roman, Times, Serif"&gt;
    &lt;td style="font: 8pt Times New Roman, Times, Serif"&gt;&lt;font style="font: 8pt Times New Roman, Times, Serif"&gt;&amp;#160;&lt;/font&gt;&lt;/td&gt;&lt;td style="font: bold 8pt Times New Roman, Times, Serif"&gt;&lt;font style="font: 8pt Times New Roman, Times, Serif"&gt;&amp;#160;&lt;/font&gt;&lt;/td&gt;
    &lt;td colspan="3" style="font: bold 8pt Times New Roman, Times, Serif; text-align: right"&gt;&lt;font style="font: 8pt Times New Roman, Times, Serif"&gt;June
    30&lt;/font&gt;&lt;/td&gt;&lt;td style="font: bold 8pt Times New Roman, Times, Serif"&gt;&lt;font style="font: 8pt Times New Roman, Times, Serif"&gt;&amp;#160;&lt;/font&gt;&lt;/td&gt;
    &lt;td colspan="3" style="font: bold 8pt Times New Roman, Times, Serif; text-align: right"&gt;&lt;font style="font: 8pt Times New Roman, Times, Serif"&gt;December
    31&lt;/font&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr style="vertical-align: bottom; font: 8pt Times New Roman, Times, Serif"&gt;
    &lt;td style="font: 8pt Times New Roman, Times, Serif"&gt;&lt;font style="font: 8pt Times New Roman, Times, Serif"&gt;&amp;#160;&lt;/font&gt;&lt;/td&gt;&lt;td style="font: bold 8pt Times New Roman, Times, Serif; padding-bottom: 1pt"&gt;&lt;font style="font: 8pt Times New Roman, Times, Serif"&gt;&amp;#160;&lt;/font&gt;&lt;/td&gt;
    &lt;td colspan="3" style="font: bold 8pt Times New Roman, Times, Serif; text-align: right; border-bottom: Black 1pt solid"&gt;&lt;font style="font: 8pt Times New Roman, Times, Serif"&gt;2013&lt;/font&gt;&lt;/td&gt;&lt;td style="font: bold 8pt Times New Roman, Times, Serif; padding-bottom: 1pt"&gt;&lt;font style="font: 8pt Times New Roman, Times, Serif"&gt;&amp;#160;&lt;/font&gt;&lt;/td&gt;
    &lt;td colspan="3" style="font: bold 8pt Times New Roman, Times, Serif; text-align: right; border-bottom: Black 1pt solid"&gt;&lt;font style="font: 8pt Times New Roman, Times, Serif"&gt;2012&lt;/font&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr style="vertical-align: bottom; font: 8pt Times New Roman, Times, Serif"&gt;
    &lt;td style="font: 8pt Times New Roman, Times, Serif"&gt;&lt;font style="font: 8pt Times New Roman, Times, Serif"&gt;&amp;#160;&lt;/font&gt;&lt;/td&gt;&lt;td style="font: 8pt Times New Roman, Times, Serif"&gt;&lt;font style="font: 8pt Times New Roman, Times, Serif"&gt;&amp;#160;&lt;/font&gt;&lt;/td&gt;
    &lt;td style="text-align: left; font: 8pt Times New Roman, Times, Serif"&gt;&lt;font style="font: 8pt Times New Roman, Times, Serif"&gt;&amp;#160;&lt;/font&gt;&lt;/td&gt;&lt;td style="text-align: right; font: 8pt Times New Roman, Times, Serif"&gt;&lt;font style="font: 8pt Times New Roman, Times, Serif"&gt;&amp;#160;&lt;/font&gt;&lt;/td&gt;&lt;td style="text-align: left; font: 8pt Times New Roman, Times, Serif"&gt;&lt;font style="font: 8pt Times New Roman, Times, Serif"&gt;&amp;#160;&lt;/font&gt;&lt;/td&gt;&lt;td style="font: 8pt Times New Roman, Times, Serif"&gt;&lt;font style="font: 8pt Times New Roman, Times, Serif"&gt;&amp;#160;&lt;/font&gt;&lt;/td&gt;
    &lt;td style="text-align: left; font: 8pt Times New Roman, Times, Serif"&gt;&lt;font style="font: 8pt Times New Roman, Times, Serif"&gt;&amp;#160;&lt;/font&gt;&lt;/td&gt;&lt;td style="text-align: right; font: 8pt Times New Roman, Times, Serif"&gt;&lt;font style="font: 8pt Times New Roman, Times, Serif"&gt;&amp;#160;&lt;/font&gt;&lt;/td&gt;&lt;td style="text-align: left; font: 8pt Times New Roman, Times, Serif"&gt;&lt;font style="font: 8pt Times New Roman, Times, Serif"&gt;&amp;#160;&lt;/font&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr style="vertical-align: bottom; font: 8pt Times New Roman, Times, Serif"&gt;
    &lt;td style="font: 8pt Times New Roman, Times, Serif"&gt;&lt;font style="font: 8pt Times New Roman, Times, Serif"&gt;&amp;#160;&lt;/font&gt;&lt;/td&gt;&lt;td style="font: 8pt Times New Roman, Times, Serif"&gt;&lt;font style="font: 8pt Times New Roman, Times, Serif"&gt;&amp;#160;&lt;/font&gt;&lt;/td&gt;
    &lt;td style="text-align: left; font: 8pt Times New Roman, Times, Serif"&gt;&lt;font style="font: 8pt Times New Roman, Times, Serif"&gt;&amp;#160;&lt;/font&gt;&lt;/td&gt;&lt;td style="text-align: right; font: 8pt Times New Roman, Times, Serif"&gt;&lt;font style="font: 8pt Times New Roman, Times, Serif"&gt;&amp;#160;&lt;/font&gt;&lt;/td&gt;&lt;td style="text-align: left; font: 8pt Times New Roman, Times, Serif"&gt;&lt;font style="font: 8pt Times New Roman, Times, Serif"&gt;&amp;#160;&lt;/font&gt;&lt;/td&gt;&lt;td style="font: 8pt Times New Roman, Times, Serif"&gt;&lt;font style="font: 8pt Times New Roman, Times, Serif"&gt;&amp;#160;&lt;/font&gt;&lt;/td&gt;
    &lt;td style="text-align: left; font: 8pt Times New Roman, Times, Serif"&gt;&lt;font style="font: 8pt Times New Roman, Times, Serif"&gt;&amp;#160;&lt;/font&gt;&lt;/td&gt;&lt;td style="text-align: right; font: 8pt Times New Roman, Times, Serif"&gt;&lt;font style="font: 8pt Times New Roman, Times, Serif"&gt;&amp;#160;&lt;/font&gt;&lt;/td&gt;&lt;td style="text-align: left; font: 8pt Times New Roman, Times, Serif"&gt;&lt;font style="font: 8pt Times New Roman, Times, Serif"&gt;&amp;#160;&lt;/font&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr style="vertical-align: bottom; font: 8pt Times New Roman, Times, Serif"&gt;
    &lt;td style="width: 56%; font: 8pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;font style="font: 8pt Times New Roman, Times, Serif"&gt;Leasehold
    improvements&lt;/font&gt;&lt;/td&gt;&lt;td style="width: 8%; font: 8pt Times New Roman, Times, Serif"&gt;&lt;font style="font: 8pt Times New Roman, Times, Serif"&gt;&amp;#160;&lt;/font&gt;&lt;/td&gt;
    &lt;td style="width: 1%; font: 8pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;font style="font: 8pt Times New Roman, Times, Serif"&gt;$&lt;/font&gt;&lt;/td&gt;&lt;td style="width: 12%; font: 8pt Times New Roman, Times, Serif; text-align: right"&gt;&lt;font style="font: 8pt Times New Roman, Times, Serif"&gt;265&lt;/font&gt;&lt;/td&gt;&lt;td style="width: 1%; font: 8pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;font style="font: 8pt Times New Roman, Times, Serif"&gt;&amp;#160;&lt;/font&gt;&lt;/td&gt;&lt;td style="width: 8%; font: 8pt Times New Roman, Times, Serif"&gt;&lt;font style="font: 8pt Times New Roman, Times, Serif"&gt;&amp;#160;&lt;/font&gt;&lt;/td&gt;
    &lt;td style="width: 1%; font: 8pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;font style="font: 8pt Times New Roman, Times, Serif"&gt;$&lt;/font&gt;&lt;/td&gt;&lt;td style="width: 12%; font: 8pt Times New Roman, Times, Serif; text-align: right"&gt;&lt;font style="font: 8pt Times New Roman, Times, Serif"&gt;265&lt;/font&gt;&lt;/td&gt;&lt;td style="width: 1%; font: 8pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;font style="font: 8pt Times New Roman, Times, Serif"&gt;&amp;#160;&lt;/font&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr style="vertical-align: bottom; font: 8pt Times New Roman, Times, Serif"&gt;
    &lt;td style="font: 8pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;font style="font: 8pt Times New Roman, Times, Serif"&gt;Motor
    vehicle&lt;/font&gt;&lt;/td&gt;&lt;td style="font: 8pt Times New Roman, Times, Serif"&gt;&lt;font style="font: 8pt Times New Roman, Times, Serif"&gt;&amp;#160;&lt;/font&gt;&lt;/td&gt;
    &lt;td style="font: 8pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;font style="font: 8pt Times New Roman, Times, Serif"&gt;&amp;#160;&lt;/font&gt;&lt;/td&gt;&lt;td style="font: 8pt Times New Roman, Times, Serif; text-align: right"&gt;&lt;font style="font: 8pt Times New Roman, Times, Serif"&gt;120&lt;/font&gt;&lt;/td&gt;&lt;td style="font: 8pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;font style="font: 8pt Times New Roman, Times, Serif"&gt;&amp;#160;&lt;/font&gt;&lt;/td&gt;&lt;td style="font: 8pt Times New Roman, Times, Serif"&gt;&lt;font style="font: 8pt Times New Roman, Times, Serif"&gt;&amp;#160;&lt;/font&gt;&lt;/td&gt;
    &lt;td style="font: 8pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;font style="font: 8pt Times New Roman, Times, Serif"&gt;&amp;#160;&lt;/font&gt;&lt;/td&gt;&lt;td style="font: 8pt Times New Roman, Times, Serif; text-align: right"&gt;&lt;font style="font: 8pt Times New Roman, Times, Serif"&gt;120&lt;/font&gt;&lt;/td&gt;&lt;td style="font: 8pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;font style="font: 8pt Times New Roman, Times, Serif"&gt;&amp;#160;&lt;/font&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr style="vertical-align: bottom; font: 8pt Times New Roman, Times, Serif"&gt;
    &lt;td style="font: 8pt Times New Roman, Times, Serif; padding-bottom: 1pt"&gt;&lt;font style="font: 8pt Times New Roman, Times, Serif"&gt;Equipment&lt;/font&gt;&lt;/td&gt;&lt;td style="font: 8pt Times New Roman, Times, Serif; padding-bottom: 1pt"&gt;&lt;font style="font: 8pt Times New Roman, Times, Serif"&gt;&amp;#160;&lt;/font&gt;&lt;/td&gt;
    &lt;td style="border-bottom: Black 1pt solid; font: 8pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;font style="font: 8pt Times New Roman, Times, Serif"&gt;&amp;#160;&lt;/font&gt;&lt;/td&gt;&lt;td style="border-bottom: Black 1pt solid; font: 8pt Times New Roman, Times, Serif; text-align: right"&gt;&lt;font style="font: 8pt Times New Roman, Times, Serif"&gt;278&lt;/font&gt;&lt;/td&gt;&lt;td style="padding-bottom: 1pt; font: 8pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;font style="font: 8pt Times New Roman, Times, Serif"&gt;&amp;#160;&lt;/font&gt;&lt;/td&gt;&lt;td style="font: 8pt Times New Roman, Times, Serif; padding-bottom: 1pt"&gt;&lt;font style="font: 8pt Times New Roman, Times, Serif"&gt;&amp;#160;&lt;/font&gt;&lt;/td&gt;
    &lt;td style="border-bottom: Black 1pt solid; font: 8pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;font style="font: 8pt Times New Roman, Times, Serif"&gt;&amp;#160;&lt;/font&gt;&lt;/td&gt;&lt;td style="border-bottom: Black 1pt solid; font: 8pt Times New Roman, Times, Serif; text-align: right"&gt;&lt;font style="font: 8pt Times New Roman, Times, Serif"&gt;177&lt;/font&gt;&lt;/td&gt;&lt;td style="padding-bottom: 1pt; font: 8pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;font style="font: 8pt Times New Roman, Times, Serif"&gt;&amp;#160;&lt;/font&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr style="vertical-align: bottom; font: 8pt Times New Roman, Times, Serif"&gt;
    &lt;td style="font: 8pt Times New Roman, Times, Serif"&gt;&lt;font style="font: 8pt Times New Roman, Times, Serif"&gt;&amp;#160;&lt;/font&gt;&lt;/td&gt;&lt;td style="font: 8pt Times New Roman, Times, Serif"&gt;&lt;font style="font: 8pt Times New Roman, Times, Serif"&gt;&amp;#160;&lt;/font&gt;&lt;/td&gt;
    &lt;td style="font: 8pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;font style="font: 8pt Times New Roman, Times, Serif"&gt;&amp;#160;&lt;/font&gt;&lt;/td&gt;&lt;td style="font: 8pt Times New Roman, Times, Serif; text-align: right"&gt;&lt;font style="font: 8pt Times New Roman, Times, Serif"&gt;663&lt;/font&gt;&lt;/td&gt;&lt;td style="font: 8pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;font style="font: 8pt Times New Roman, Times, Serif"&gt;&amp;#160;&lt;/font&gt;&lt;/td&gt;&lt;td style="font: 8pt Times New Roman, Times, Serif"&gt;&lt;font style="font: 8pt Times New Roman, Times, Serif"&gt;&amp;#160;&lt;/font&gt;&lt;/td&gt;
    &lt;td style="font: 8pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;font style="font: 8pt Times New Roman, Times, Serif"&gt;&amp;#160;&lt;/font&gt;&lt;/td&gt;&lt;td style="font: 8pt Times New Roman, Times, Serif; text-align: right"&gt;&lt;font style="font: 8pt Times New Roman, Times, Serif"&gt;562&lt;/font&gt;&lt;/td&gt;&lt;td style="font: 8pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;font style="font: 8pt Times New Roman, Times, Serif"&gt;&amp;#160;&lt;/font&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr style="vertical-align: bottom; font: 8pt Times New Roman, Times, Serif"&gt;
    &lt;td style="font: 8pt Times New Roman, Times, Serif; text-align: left; padding-bottom: 1pt"&gt;&lt;font style="font: 8pt Times New Roman, Times, Serif"&gt;Less
    accumulated depreciation&lt;/font&gt;&lt;/td&gt;&lt;td style="font: 8pt Times New Roman, Times, Serif; padding-bottom: 1pt"&gt;&lt;font style="font: 8pt Times New Roman, Times, Serif"&gt;&amp;#160;&lt;/font&gt;&lt;/td&gt;
    &lt;td style="border-bottom: Black 1pt solid; font: 8pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;font style="font: 8pt Times New Roman, Times, Serif"&gt;&amp;#160;&lt;/font&gt;&lt;/td&gt;&lt;td style="border-bottom: Black 1pt solid; font: 8pt Times New Roman, Times, Serif; text-align: right"&gt;&lt;font style="font: 8pt Times New Roman, Times, Serif"&gt;(285&lt;/font&gt;&lt;/td&gt;&lt;td style="padding-bottom: 1pt; font: 8pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;font style="font: 8pt Times New Roman, Times, Serif"&gt;)&lt;/font&gt;&lt;/td&gt;&lt;td style="font: 8pt Times New Roman, Times, Serif; padding-bottom: 1pt"&gt;&lt;font style="font: 8pt Times New Roman, Times, Serif"&gt;&amp;#160;&lt;/font&gt;&lt;/td&gt;
    &lt;td style="border-bottom: Black 1pt solid; font: 8pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;font style="font: 8pt Times New Roman, Times, Serif"&gt;&amp;#160;&lt;/font&gt;&lt;/td&gt;&lt;td style="border-bottom: Black 1pt solid; font: 8pt Times New Roman, Times, Serif; text-align: right"&gt;&lt;font style="font: 8pt Times New Roman, Times, Serif"&gt;(212&lt;/font&gt;&lt;/td&gt;&lt;td style="padding-bottom: 1pt; font: 8pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;font style="font: 8pt Times New Roman, Times, Serif"&gt;)&lt;/font&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr style="vertical-align: bottom; font: 8pt Times New Roman, Times, Serif"&gt;
    &lt;td style="text-align: justify; text-indent: -13.5pt; padding-left: 13.5pt; font: 8pt Times New Roman, Times, Serif"&gt;&lt;font style="font: 8pt Times New Roman, Times, Serif"&gt;&amp;#160;&lt;/font&gt;&lt;/td&gt;&lt;td style="font: 8pt Times New Roman, Times, Serif"&gt;&lt;font style="font: 8pt Times New Roman, Times, Serif"&gt;&amp;#160;&lt;/font&gt;&lt;/td&gt;
    &lt;td style="text-align: left; font: 8pt Times New Roman, Times, Serif"&gt;&lt;font style="font: 8pt Times New Roman, Times, Serif"&gt;&amp;#160;&lt;/font&gt;&lt;/td&gt;&lt;td style="text-align: right; font: 8pt Times New Roman, Times, Serif"&gt;&lt;font style="font: 8pt Times New Roman, Times, Serif"&gt;&amp;#160;&lt;/font&gt;&lt;/td&gt;&lt;td style="text-align: left; font: 8pt Times New Roman, Times, Serif"&gt;&lt;font style="font: 8pt Times New Roman, Times, Serif"&gt;&amp;#160;&lt;/font&gt;&lt;/td&gt;&lt;td style="font: 8pt Times New Roman, Times, Serif"&gt;&lt;font style="font: 8pt Times New Roman, Times, Serif"&gt;&amp;#160;&lt;/font&gt;&lt;/td&gt;
    &lt;td style="text-align: left; font: 8pt Times New Roman, Times, Serif"&gt;&lt;font style="font: 8pt Times New Roman, Times, Serif"&gt;&amp;#160;&lt;/font&gt;&lt;/td&gt;&lt;td style="text-align: right; font: 8pt Times New Roman, Times, Serif"&gt;&lt;font style="font: 8pt Times New Roman, Times, Serif"&gt;&amp;#160;&lt;/font&gt;&lt;/td&gt;&lt;td style="text-align: left; font: 8pt Times New Roman, Times, Serif"&gt;&lt;font style="font: 8pt Times New Roman, Times, Serif"&gt;&amp;#160;&lt;/font&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr style="vertical-align: bottom; font: 8pt Times New Roman, Times, Serif"&gt;
    &lt;td style="font: 8pt Times New Roman, Times, Serif; text-align: justify; padding-bottom: 1pt; text-indent: -13.5pt; padding-left: 13.5pt"&gt;&lt;font style="font: 8pt Times New Roman, Times, Serif"&gt;Property
    and equipment, net&lt;/font&gt;&lt;/td&gt;&lt;td style="font: 8pt Times New Roman, Times, Serif; padding-bottom: 1pt"&gt;&lt;font style="font: 8pt Times New Roman, Times, Serif"&gt;&amp;#160;&lt;/font&gt;&lt;/td&gt;
    &lt;td style="border-bottom: Black 1pt solid; font: 8pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;font style="font: 8pt Times New Roman, Times, Serif"&gt;$&lt;/font&gt;&lt;/td&gt;&lt;td style="border-bottom: Black 1pt solid; font: 8pt Times New Roman, Times, Serif; text-align: right"&gt;&lt;font style="font: 8pt Times New Roman, Times, Serif"&gt;378&lt;/font&gt;&lt;/td&gt;&lt;td style="padding-bottom: 1pt; font: 8pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;font style="font: 8pt Times New Roman, Times, Serif"&gt;&amp;#160;&lt;/font&gt;&lt;/td&gt;&lt;td style="font: 8pt Times New Roman, Times, Serif; padding-bottom: 1pt"&gt;&lt;font style="font: 8pt Times New Roman, Times, Serif"&gt;&amp;#160;&lt;/font&gt;&lt;/td&gt;
    &lt;td style="border-bottom: Black 1pt solid; font: 8pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;font style="font: 8pt Times New Roman, Times, Serif"&gt;$&lt;/font&gt;&lt;/td&gt;&lt;td style="border-bottom: Black 1pt solid; font: 8pt Times New Roman, Times, Serif; text-align: right"&gt;&lt;font style="font: 8pt Times New Roman, Times, Serif"&gt;350&lt;/font&gt;&lt;/td&gt;&lt;td style="padding-bottom: 1pt; font: 8pt Times New Roman, Times, Serif; text-align: left"&gt;&lt;font style="font: 8pt Times New Roman, Times, Serif"&gt;&amp;#160;&lt;/font&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;/table&gt;

&lt;p style="font: 8pt/normal Times New Roman, Times, Serif; margin: 0; text-align: justify"&gt;&lt;font style="font: 8pt Times New Roman, Times, Serif"&gt;&lt;b&gt;&amp;#160;&lt;/b&gt;&lt;/font&gt;&lt;/p&gt;</NonNumbericText><FootnoteIndexer /><CurrencyCode /><CurrencySymbol /><IsIndependantCurrency>false</IsIndependantCurrency><ShowCurrencySymbol>false</ShowCurrencySymbol><DisplayDateInUSFormat>false</DisplayDateInUSFormat></Cell></Cells><ElementDataType>nonnum:textBlockItemType</ElementDataType><SimpleDataType>na</SimpleDataType><ElementDefenition>The entire disclosure for long-lived, physical assets used in the normal conduct of business and not intended for resale. Includes, but is not limited to, accounting policies and methodology, roll forwards, depreciation, depletion and amortization expense, including composite depreciation, accumulated depreciation, depletion and amortization expense, useful lives and method used, income statement disclosures, assets held for sale and public utility disclosures.</ElementDefenition><ElementReferences>Reference 1: http://www.xbrl.org/2003/role/presentationRef

 -Publisher FASB

 -Name Accounting Standards Codification

 -Topic 360

 -SubTopic 10

 -Section 50

 -Paragraph 1

 -URI http://asc.fasb.org/extlink&amp;oid=6391035&amp;loc=d3e2868-110229



Reference 2: http://www.xbrl.org/2003/role/presentationRef

 -Publisher FASB

 -Name Accounting Standards Codification

 -Topic 360

 -SubTopic 10

 -Section 50

 -Paragraph 2

 -URI http://asc.fasb.org/extlink&amp;oid=6391110&amp;loc=d3e2921-110230



Reference 3: http://www.xbrl.org/2003/role/presentationRef

 -Publisher FASB

 -Name Accounting Standards Codification

 -Topic 205

 -SubTopic 20

 -Section 50

 -Paragraph 1

 -URI http://asc.fasb.org/extlink&amp;oid=6360339&amp;loc=d3e1361-107760



Reference 4: http://www.xbrl.org/2003/role/presentationRef

 -Publisher FASB

 -Name Accounting Standards Codification

 -Topic 210

 -SubTopic 10

 -Section S99

 -Paragraph 1

 -Subparagraph (SX 210.5-02.13-14)

 -URI http://asc.fasb.org/extlink&amp;oid=6877327&amp;loc=d3e13212-122682



</ElementReferences><IsTotalLabel>false</IsTotalLabel><UnitID>0</UnitID><Label>4. Property and Equipment, net</Label></Row></Rows><Footnotes /><IsEquityReport>false</IsEquityReport><ReportName>4. Property and Equipment, net</ReportName><MonetaryRoundingLevel>UnKnown</MonetaryRoundingLevel><SharesRoundingLevel>UnKnown</SharesRoundingLevel><PerShareRoundingLevel>UnKnown</PerShareRoundingLevel><ExchangeRateRoundingLevel>UnKnown</ExchangeRateRoundingLevel><HasCustomUnits>true</HasCustomUnits><IsEmbedReport>false</IsEmbedReport><IsMultiCurrency>false</IsMultiCurrency><ReportType>Sheet</ReportType><RoleURI>http://onehorizongroup.com/role/PropertyAndEquipmentNet</RoleURI><NumberOfCols>1</NumberOfCols><NumberOfRows>2</NumberOfRows></InstanceReport>
