<?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>014 - Disclosure - NET LOSS PER COMMON SHARE DATA</ReportLongName><DisplayLabelColumn>true</DisplayLabelColumn><ShowElementNames>false</ShowElementNames><RoundingOption /><HasEmbeddedReports>false</HasEmbeddedReports><Columns><Column FlagID="0"><Id>1</Id><IsAbstractGroupTitle>false</IsAbstractGroupTitle><LabelSeparator>

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</LabelSeparator><Level>2</Level><ElementName>us-gaap_EarningsPerShareTextBlock</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><PreferredLabelRole>terseLabel</PreferredLabelRole><FootnoteIndexer /><Cells><Cell FlagID="0" ContextID="Context_6ME__30-Jun-2013" UnitID=""><Id>1</Id><IsNumeric>false</IsNumeric><IsRatio>false</IsRatio><DisplayZeroAsNone>false</DisplayZeroAsNone><NumericAmount>0</NumericAmount><RoundedNumericAmount>0</RoundedNumericAmount><NonNumbericText>&lt;table style="font: 10pt/normal times new roman, times, serif; width: 100%; margin-top: 0pt; margin-bottom: 0px; font-size-adjust: none; font-stretch: normal;" cellspacing="0" cellpadding="0"&gt;
&lt;tr style="vertical-align: top;"&gt;
&lt;td style="width: 0%;"&gt;&lt;/td&gt;
&lt;td style="width: 4%; text-align: left;"&gt;&lt;font style="font-size: 10pt;"&gt;&lt;b&gt;&lt;a name="lucida026_v1"&gt;&lt;/a&gt;9.&lt;/b&gt;&lt;/font&gt;&lt;/td&gt;
&lt;td&gt;&lt;font style="font-size: 10pt;"&gt;&lt;b&gt;NET LOSS PER COMMON SHARE DATA&lt;/b&gt;&lt;/font&gt;&lt;/td&gt;
&lt;/tr&gt;
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&lt;p style="font: 10pt/normal times new roman, times, serif; margin: 10px 0px 0px; font-size-adjust: none; font-stretch: normal;"&gt;&lt;font style="font-size: 10pt;"&gt;The following table sets forth the computation of basic and diluted net loss attributable to common stockholders per common share, as well as a reconciliation of the numerator and denominator used in the computation:&lt;/font&gt;&lt;/p&gt;
&lt;p style="font: 10pt/normal times new roman, times, serif; margin: 0px; font-size-adjust: none; font-stretch: normal;"&gt;&lt;font style="font-size: 10pt;"&gt;&amp;#160;&lt;/font&gt;&lt;/p&gt;
&lt;table align="center" style="font: 10pt/normal times new roman, times, serif; width: 90%; border-collapse: collapse; font-size-adjust: none; font-stretch: normal;" cellspacing="0" cellpadding="0"&gt;
&lt;tr style="vertical-align: bottom;"&gt;
&lt;td nowrap="nowrap" style="text-align: center; text-indent: -8px; padding-left: 8px;"&gt;&amp;#160;&lt;/td&gt;
&lt;td nowrap="nowrap" style="padding-bottom: 1pt; font-weight: bold;"&gt;&amp;#160;&lt;/td&gt;
&lt;td nowrap="nowrap" style="text-align: center; font-weight: bold; border-bottom-color: black; border-bottom-width: 1pt; border-bottom-style: solid;" colspan="6"&gt;Three Months Ended June 30,&lt;/td&gt;
&lt;td nowrap="nowrap" style="padding-bottom: 1pt; font-weight: bold;"&gt;&amp;#160;&lt;/td&gt;
&lt;td nowrap="nowrap" style="padding-bottom: 1pt; font-weight: bold;"&gt;&amp;#160;&lt;/td&gt;
&lt;td nowrap="nowrap" style="text-align: center; font-weight: bold; border-bottom-color: black; border-bottom-width: 1pt; border-bottom-style: solid;" colspan="6"&gt;Six Months Ended June 30,&lt;/td&gt;
&lt;td nowrap="nowrap" style="padding-bottom: 1pt; font-weight: bold;"&gt;&amp;#160;&lt;/td&gt;
&lt;/tr&gt;
&lt;tr style="vertical-align: bottom;"&gt;
&lt;td style="text-align: center; text-indent: -8px; padding-left: 8px;"&gt;&amp;#160;&lt;/td&gt;
&lt;td style="padding-bottom: 1pt; font-weight: bold;"&gt;&amp;#160;&lt;/td&gt;
&lt;td style="text-align: center; font-weight: bold; border-bottom-color: black; border-bottom-width: 1pt; border-bottom-style: solid;" colspan="2"&gt;2013&lt;/td&gt;
&lt;td style="padding-bottom: 1pt; font-weight: bold;"&gt;&amp;#160;&lt;/td&gt;
&lt;td style="padding-bottom: 1pt; font-weight: bold;"&gt;&amp;#160;&lt;/td&gt;
&lt;td style="text-align: center; font-weight: bold; border-bottom-color: black; border-bottom-width: 1pt; border-bottom-style: solid;" colspan="2"&gt;2012&lt;/td&gt;
&lt;td style="padding-bottom: 1pt; font-weight: bold;"&gt;&amp;#160;&lt;/td&gt;
&lt;td style="padding-bottom: 1pt; font-weight: bold;"&gt;&amp;#160;&lt;/td&gt;
&lt;td style="text-align: center; font-weight: bold; border-bottom-color: black; border-bottom-width: 1pt; border-bottom-style: solid;" colspan="2"&gt;2013&lt;/td&gt;
&lt;td style="padding-bottom: 1pt; font-weight: bold;"&gt;&amp;#160;&lt;/td&gt;
&lt;td style="padding-bottom: 1pt; font-weight: bold;"&gt;&amp;#160;&lt;/td&gt;
&lt;td style="text-align: center; font-weight: bold; border-bottom-color: black; border-bottom-width: 1pt; border-bottom-style: solid;" colspan="2"&gt;2012&lt;/td&gt;
&lt;td style="padding-bottom: 1pt; font-weight: bold;"&gt;&amp;#160;&lt;/td&gt;
&lt;/tr&gt;
&lt;tr style="vertical-align: bottom; background-color: #cceecc;"&gt;
&lt;td style="width: 34%; text-align: left; text-indent: -8px; padding-left: 8px;"&gt;Net loss&lt;/td&gt;
&lt;td style="width: 3%;"&gt;&amp;#160;&lt;/td&gt;
&lt;td style="width: 1%; text-align: left;"&gt;$&lt;/td&gt;
&lt;td style="width: 9%; text-align: right;"&gt;(1,272,027&lt;/td&gt;
&lt;td style="width: 1%; text-align: left;"&gt;)&lt;/td&gt;
&lt;td style="width: 3%;"&gt;&amp;#160;&lt;/td&gt;
&lt;td style="width: 1%; text-align: left;"&gt;$&lt;/td&gt;
&lt;td style="width: 9%; text-align: right;"&gt;(2,338,538&lt;/td&gt;
&lt;td style="width: 1%; text-align: left;"&gt;)&lt;/td&gt;
&lt;td style="width: 3%;"&gt;&amp;#160;&lt;/td&gt;
&lt;td style="width: 1%; text-align: left;"&gt;$&lt;/td&gt;
&lt;td style="width: 9%; text-align: right;"&gt;(2,324,822&lt;/td&gt;
&lt;td style="width: 1%; text-align: left;"&gt;)&lt;/td&gt;
&lt;td style="width: 3%;"&gt;&amp;#160;&lt;/td&gt;
&lt;td style="width: 1%; text-align: left;"&gt;$&lt;/td&gt;
&lt;td style="width: 9%; text-align: right;"&gt;(5,719,182&lt;/td&gt;
&lt;td style="width: 1%; text-align: left;"&gt;)&lt;/td&gt;
&lt;/tr&gt;
&lt;tr style="vertical-align: bottom;"&gt;
&lt;td style="text-indent: -8px; padding-left: 8px;"&gt;&amp;#160;&lt;/td&gt;
&lt;td&gt;&amp;#160;&lt;/td&gt;
&lt;td style="text-align: left;"&gt;&amp;#160;&lt;/td&gt;
&lt;td style="text-align: right;"&gt;&amp;#160;&lt;/td&gt;
&lt;td style="text-align: left;"&gt;&amp;#160;&lt;/td&gt;
&lt;td&gt;&amp;#160;&lt;/td&gt;
&lt;td style="text-align: left;"&gt;&amp;#160;&lt;/td&gt;
&lt;td style="text-align: right;"&gt;&amp;#160;&lt;/td&gt;
&lt;td style="text-align: left;"&gt;&amp;#160;&lt;/td&gt;
&lt;td&gt;&amp;#160;&lt;/td&gt;
&lt;td style="text-align: left;"&gt;&amp;#160;&lt;/td&gt;
&lt;td style="text-align: right;"&gt;&amp;#160;&lt;/td&gt;
&lt;td style="text-align: left;"&gt;&amp;#160;&lt;/td&gt;
&lt;td&gt;&amp;#160;&lt;/td&gt;
&lt;td style="text-align: left;"&gt;&amp;#160;&lt;/td&gt;
&lt;td style="text-align: right;"&gt;&amp;#160;&lt;/td&gt;
&lt;td style="text-align: left;"&gt;&amp;#160;&lt;/td&gt;
&lt;/tr&gt;
&lt;tr style="vertical-align: bottom; background-color: white;"&gt;
&lt;td style="text-indent: -8px; padding-left: 8px;"&gt;Denominator:&lt;/td&gt;
&lt;td&gt;&amp;#160;&lt;/td&gt;
&lt;td style="text-align: left;"&gt;&amp;#160;&lt;/td&gt;
&lt;td style="text-align: right;"&gt;&amp;#160;&lt;/td&gt;
&lt;td style="text-align: left;"&gt;&amp;#160;&lt;/td&gt;
&lt;td&gt;&amp;#160;&lt;/td&gt;
&lt;td style="text-align: left;"&gt;&amp;#160;&lt;/td&gt;
&lt;td style="text-align: right;"&gt;&amp;#160;&lt;/td&gt;
&lt;td style="text-align: left;"&gt;&amp;#160;&lt;/td&gt;
&lt;td&gt;&amp;#160;&lt;/td&gt;
&lt;td style="text-align: left;"&gt;&amp;#160;&lt;/td&gt;
&lt;td style="text-align: right;"&gt;&amp;#160;&lt;/td&gt;
&lt;td style="text-align: left;"&gt;&amp;#160;&lt;/td&gt;
&lt;td&gt;&amp;#160;&lt;/td&gt;
&lt;td style="text-align: left;"&gt;&amp;#160;&lt;/td&gt;
&lt;td style="text-align: right;"&gt;&amp;#160;&lt;/td&gt;
&lt;td style="text-align: left;"&gt;&amp;#160;&lt;/td&gt;
&lt;/tr&gt;
&lt;tr style="vertical-align: bottom; background-color: #cceecc;"&gt;
&lt;td style="text-indent: -8px; padding-left: 8px;"&gt;Weighted-average common shares outstanding&lt;/td&gt;
&lt;td&gt;&amp;#160;&lt;/td&gt;
&lt;td style="text-align: left;"&gt;&amp;#160;&lt;/td&gt;
&lt;td style="text-align: right;"&gt;8,384,708&lt;/td&gt;
&lt;td style="text-align: left;"&gt;&amp;#160;&lt;/td&gt;
&lt;td&gt;&amp;#160;&lt;/td&gt;
&lt;td style="text-align: left;"&gt;&amp;#160;&lt;/td&gt;
&lt;td style="text-align: right;"&gt;7,821,058&lt;/td&gt;
&lt;td style="text-align: left;"&gt;&amp;#160;&lt;/td&gt;
&lt;td&gt;&amp;#160;&lt;/td&gt;
&lt;td style="text-align: left;"&gt;&amp;#160;&lt;/td&gt;
&lt;td style="text-align: right;"&gt;8,384,708&lt;/td&gt;
&lt;td style="text-align: left;"&gt;&amp;#160;&lt;/td&gt;
&lt;td&gt;&amp;#160;&lt;/td&gt;
&lt;td style="text-align: left;"&gt;&amp;#160;&lt;/td&gt;
&lt;td style="text-align: right;"&gt;7,806,241&lt;/td&gt;
&lt;td style="text-align: left;"&gt;&amp;#160;&lt;/td&gt;
&lt;/tr&gt;
&lt;tr style="vertical-align: bottom; background-color: white;"&gt;
&lt;td style="text-align: left; text-indent: -8px; padding-left: 8px;"&gt;Basic and diluted net loss per common share&lt;/td&gt;
&lt;td style="padding-bottom: 2.5pt;"&gt;&amp;#160;&lt;/td&gt;
&lt;td style="text-align: left; border-bottom-color: black; border-bottom-width: 2.5pt; border-bottom-style: double;"&gt;$&lt;/td&gt;
&lt;td style="text-align: right; border-bottom-color: black; border-bottom-width: 2.5pt; border-bottom-style: double;"&gt;(0.15&lt;/td&gt;
&lt;td style="text-align: left; padding-bottom: 2.5pt;"&gt;)&lt;/td&gt;
&lt;td style="padding-bottom: 2.5pt;"&gt;&amp;#160;&lt;/td&gt;
&lt;td style="text-align: left; border-bottom-color: black; border-bottom-width: 2.5pt; border-bottom-style: double;"&gt;$&lt;/td&gt;
&lt;td style="text-align: right; border-bottom-color: black; border-bottom-width: 2.5pt; border-bottom-style: double;"&gt;(0.30&lt;/td&gt;
&lt;td style="text-align: left; padding-bottom: 2.5pt;"&gt;)&lt;/td&gt;
&lt;td style="padding-bottom: 2.5pt;"&gt;&amp;#160;&lt;/td&gt;
&lt;td style="text-align: left; border-bottom-color: black; border-bottom-width: 2.5pt; border-bottom-style: double;"&gt;$&lt;/td&gt;
&lt;td style="text-align: right; border-bottom-color: black; border-bottom-width: 2.5pt; border-bottom-style: double;"&gt;(0.28&lt;/td&gt;
&lt;td style="text-align: left; padding-bottom: 2.5pt;"&gt;)&lt;/td&gt;
&lt;td style="padding-bottom: 2.5pt;"&gt;&amp;#160;&lt;/td&gt;
&lt;td style="text-align: left; border-bottom-color: black; border-bottom-width: 2.5pt; border-bottom-style: double;"&gt;$&lt;/td&gt;
&lt;td style="text-align: right; border-bottom-color: black; border-bottom-width: 2.5pt; border-bottom-style: double;"&gt;(0.73&lt;/td&gt;
&lt;td style="text-align: left; padding-bottom: 2.5pt;"&gt;)&lt;/td&gt;
&lt;/tr&gt;
&lt;/table&gt;
&lt;p style="font: 10pt/normal times new roman, times, serif; margin: 0px; font-size-adjust: none; font-stretch: normal;"&gt;&lt;font style="font-size: 10pt;"&gt;&amp;#160;&lt;/font&gt;&lt;/p&gt;
&lt;p style="font: 10pt/normal times new roman, times, serif; margin: 0px; font-size-adjust: none; font-stretch: normal;"&gt;&lt;font style="font-size: 10pt;"&gt;The following equivalent shares were excluded from the calculation of diluted loss per share as their impact would have been anti-dilutive:&lt;/font&gt;&lt;/p&gt;
&lt;p style="font: 10pt/normal times new roman, times, serif; margin: 0px; font-size-adjust: none; font-stretch: normal;"&gt;&lt;font style="font-size: 10pt;"&gt;&amp;#160;&lt;/font&gt;&lt;/p&gt;
&lt;table align="center" style="font: 10pt/normal times new roman, times, serif; width: 80%; border-collapse: collapse; font-size-adjust: none; font-stretch: normal;" cellspacing="0" cellpadding="0"&gt;
&lt;tr style="vertical-align: bottom;"&gt;
&lt;td nowrap="nowrap" style="text-align: center; font-weight: bold;"&gt;&amp;#160;&lt;/td&gt;
&lt;td nowrap="nowrap" style="padding-bottom: 1pt; font-weight: bold;"&gt;&amp;#160;&lt;/td&gt;
&lt;td nowrap="nowrap" style="text-align: center; font-weight: bold; border-bottom-color: black; border-bottom-width: 1pt; border-bottom-style: solid;" colspan="6"&gt;Six months ended June&amp;#160;30,&lt;/td&gt;
&lt;td nowrap="nowrap" style="padding-bottom: 1pt; font-weight: bold;"&gt;&amp;#160;&lt;/td&gt;
&lt;/tr&gt;
&lt;tr style="vertical-align: bottom;"&gt;
&lt;td style="text-align: center; font-weight: bold;"&gt;&amp;#160;&lt;/td&gt;
&lt;td style="padding-bottom: 1pt; font-weight: bold;"&gt;&amp;#160;&lt;/td&gt;
&lt;td style="text-align: center; font-weight: bold; border-bottom-color: black; border-bottom-width: 1pt; border-bottom-style: solid;" colspan="2"&gt;2013&lt;/td&gt;
&lt;td style="padding-bottom: 1pt; font-weight: bold;"&gt;&amp;#160;&lt;/td&gt;
&lt;td style="padding-bottom: 1pt; font-weight: bold;"&gt;&amp;#160;&lt;/td&gt;
&lt;td style="text-align: center; font-weight: bold; border-bottom-color: black; border-bottom-width: 1pt; border-bottom-style: solid;" colspan="2"&gt;2012&lt;/td&gt;
&lt;td style="padding-bottom: 1pt; font-weight: bold;"&gt;&amp;#160;&lt;/td&gt;
&lt;/tr&gt;
&lt;tr style="vertical-align: bottom;"&gt;
&lt;td style="text-align: left;"&gt;&amp;#160;&lt;/td&gt;
&lt;td&gt;&amp;#160;&lt;/td&gt;
&lt;td style="text-align: left;"&gt;&amp;#160;&lt;/td&gt;
&lt;td style="text-align: right;"&gt;&amp;#160;&lt;/td&gt;
&lt;td style="text-align: left;"&gt;&amp;#160;&lt;/td&gt;
&lt;td&gt;&amp;#160;&lt;/td&gt;
&lt;td style="text-align: left;"&gt;&amp;#160;&lt;/td&gt;
&lt;td style="text-align: right;"&gt;&amp;#160;&lt;/td&gt;
&lt;td style="text-align: left;"&gt;&amp;#160;&lt;/td&gt;
&lt;/tr&gt;
&lt;tr style="vertical-align: bottom; background-color: #cceecc;"&gt;
&lt;td style="width: 52%; text-align: left;"&gt;Options to purchase common stock&lt;/td&gt;
&lt;td style="width: 3%;"&gt;&amp;#160;&lt;/td&gt;
&lt;td style="width: 1%; text-align: left;"&gt;&amp;#160;&lt;/td&gt;
&lt;td style="width: 9%; text-align: right;"&gt;685,000&lt;/td&gt;
&lt;td style="width: 1%; text-align: left;"&gt;&amp;#160;&lt;/td&gt;
&lt;td style="width: 3%;"&gt;&amp;#160;&lt;/td&gt;
&lt;td style="width: 1%; text-align: left;"&gt;&amp;#160;&lt;/td&gt;
&lt;td style="width: 9%; text-align: right;"&gt;1,811,941&lt;/td&gt;
&lt;td style="width: 1%; text-align: left;"&gt;&amp;#160;&lt;/td&gt;
&lt;/tr&gt;
&lt;tr style="vertical-align: bottom; background-color: white;"&gt;
&lt;td style="text-indent: -11pt; padding-left: 11pt;"&gt;Warrants&lt;/td&gt;
&lt;td&gt;&amp;#160;&lt;/td&gt;
&lt;td style="text-align: left;"&gt;&amp;#160;&lt;/td&gt;
&lt;td style="text-align: right;"&gt;1,981,661&lt;/td&gt;
&lt;td style="text-align: left;"&gt;&amp;#160;&lt;/td&gt;
&lt;td&gt;&amp;#160;&lt;/td&gt;
&lt;td style="text-align: left;"&gt;&amp;#160;&lt;/td&gt;
&lt;td style="text-align: right;"&gt;2,215,680&lt;/td&gt;
&lt;td style="text-align: left;"&gt;&amp;#160;&lt;/td&gt;
&lt;/tr&gt;
&lt;tr style="vertical-align: bottom; background-color: #cceecc;"&gt;
&lt;td style="text-align: left; text-indent: -11pt; padding-left: 11pt;"&gt;Restricted stock&lt;/td&gt;
&lt;td&gt;&amp;#160;&lt;/td&gt;
&lt;td style="text-align: left;"&gt;&amp;#160;&lt;/td&gt;
&lt;td style="text-align: right;"&gt;122,667&lt;/td&gt;
&lt;td style="text-align: left;"&gt;&amp;#160;&lt;/td&gt;
&lt;td&gt;&amp;#160;&lt;/td&gt;
&lt;td style="text-align: left;"&gt;&amp;#160;&lt;/td&gt;
&lt;td style="text-align: right;"&gt;122,167&lt;/td&gt;
&lt;td style="text-align: left;"&gt;&amp;#160;&lt;/td&gt;
&lt;/tr&gt;
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