<?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>1040 - Disclosure - Note Payable</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>D2012</ContextID><EntitySchema>http://www.sec.gov/CIK</EntitySchema><EntityValue>0001436304</EntityValue><PeriodDisplayName /><PeriodType>duration</PeriodType><PeriodStartDate>2012-01-01T00:00:00</PeriodStartDate><PeriodEndDate>2012-12-31T00:00:00</PeriodEndDate><Segments /><Scenarios /></contextRef><UPS /><CurrencyCode /><OriginalCurrencyCode /></MCU><CurrencySymbol /><Labels><Label Key="CalendarSupplement" Id="0" Label="12 Months Ended" /><Label Key="Calendar" Id="1" Label="Dec. 31, 2012" /></Labels></Column></Columns><Rows><Row FlagID="0"><Id>1</Id><IsAbstractGroupTitle>true</IsAbstractGroupTitle><LabelSeparator>

</LabelSeparator><Level>1</Level><ElementName>us-gaap_DebtDisclosureAbstract</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>Note Payable</Label></Row><Row FlagID="0"><Id>2</Id><IsAbstractGroupTitle>false</IsAbstractGroupTitle><LabelSeparator>

</LabelSeparator><Level>2</Level><ElementName>us-gaap_DebtDisclosureTextBlock</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="D2012" UnitID=""><Id>1</Id><IsNumeric>false</IsNumeric><IsRatio>false</IsRatio><DisplayZeroAsNone>false</DisplayZeroAsNone><NumericAmount>0</NumericAmount><RoundedNumericAmount>0</RoundedNumericAmount><NonNumbericText>&lt;div style='font-size:10.0pt;FONT-FAMILY: Times New Roman;'&gt;
&lt;p style="FONT-FAMILY: times"&gt;&lt;font size="2"&gt;&lt;b&gt;4. Note Payable&lt;/b&gt;&lt;/font&gt;&lt;/p&gt;
&lt;p style="FONT-FAMILY: times"&gt;&lt;font size="2"&gt;&amp;#160;&amp;#160;&amp;#160;&amp;#160;&amp;#160;&amp;#160;&amp;#160;&amp;#160;On March&amp;#160;21, 2011, the Company executed a debt financing agreement whereby the Company had access to borrow up to $15,000,000 of senior loan financing through January&amp;#160;1, 2012. On December&amp;#160;30, 2011, the Company amended its credit facility to provide for an extension of its drawdown period through December&amp;#160;1, 2012, provided that it had drawn down at least $5,000,000 as of August&amp;#160;1, 2012. On July&amp;#160;23, 2012, the Company obtained an additional 60&amp;#160;day extension of the initial drawdown date from August&amp;#160;1, 2012 to October&amp;#160;1, 2012. For each draw, the Company shall make six months of interest only payments at a fixed rate of 11.5% followed by 30&amp;#160;months of interest and principal payments at a fixed rate of 8.5% and a final payment of 6% of the amount drawn. As of December&amp;#160;31, 2011, no amounts had been drawn. The debt is secured by all the Company's assets, except for the Company's intellectual property, which is subject to a negative pledge agreement.&lt;/font&gt;&lt;/p&gt;
&lt;p style="FONT-FAMILY: times"&gt;&lt;font size="2"&gt;&amp;#160;&amp;#160;&amp;#160;&amp;#160;&amp;#160;&amp;#160;&amp;#160;&amp;#160;On October&amp;#160;1, 2012 the Company drew $5,000,000 and, in November 2012, obtained an extension allowing for the draw of the remaining $10,000,000 in $5,000,000 increments by January&amp;#160;31, 2013 and February&amp;#160;28, 2013 (see further discussion in Note&amp;#160;12, "Subsequent Events").&lt;/font&gt;&lt;/p&gt;
&lt;p style="FONT-FAMILY: times"&gt;&lt;font size="2"&gt;&amp;#160;&amp;#160;&amp;#160;&amp;#160;&amp;#160;&amp;#160;&amp;#160;&amp;#160;Upon entry into the agreement, the Company issued warrants to purchase 34,000 shares of Series&amp;#160;C redeemable convertible preferred stock ("Series&amp;#160;C Preferred") at an exercise price of $13.3530. The estimated fair value of the warrants at issuance of approximately $345,000 was recorded as a deferred financing cost offsetting the note payable liability and is being amortized to warrant and other interest income (expense), net, over the expected term of the loan.&lt;/font&gt;&lt;/p&gt;
&lt;p style="FONT-FAMILY: times"&gt;&lt;font size="2"&gt;&amp;#160;&amp;#160;&amp;#160;&amp;#160;&amp;#160;&amp;#160;&amp;#160;&amp;#160;Upon extension of the credit facility in July 2012, the Company issued a warrant to purchase up to an additional 86,000 shares of its Series&amp;#160;D redeemable convertible preferred stock ("Series&amp;#160;D Preferred") at an exercise price of $13.9040. The estimated fair value of the warrant at issuance of approximately $1,074,000 was recorded as a deferred financing cost offsetting the note payable liability and is being amortized to warrant and other interest income (expense), net over the expected term of the loan.&lt;/font&gt;&lt;/p&gt;
&lt;p style="FONT-FAMILY: times"&gt;&lt;font size="2"&gt;&amp;#160;&amp;#160;&amp;#160;&amp;#160;&amp;#160;&amp;#160;&amp;#160;&amp;#160;Upon issuance, the Company classified the warrants to purchase convertible preferred stock as a liability and re-measured the liability to estimated fair value using the Black-Scholes option pricing model. Assumptions used to revalue the Series&amp;#160;C Preferred warrants at December&amp;#160;31, 2011 were as follows: contractual life according to the remaining terms of the warrants, no dividend yield, risk-free interest rate of 1.75% and volatility of 80%. Assumptions used to revalue the Series&amp;#160;D Preferred warrants at December&amp;#160;31, 2011 were as follows: contractual life according to the remaining terms of the warrants, no dividend yield, risk-free interest rate of 1.89% and volatility of 81%. Upon IPO in October of 2012, the warrants to purchase convertible preferred stock were converted to warrants to purchase common stock. Upon this conversion, the warrants ceased to be remeasured and the warrant liability was reclassified to equity.&lt;/font&gt;&lt;/p&gt;
&lt;p style="FONT-FAMILY: times"&gt;&lt;font size="2"&gt;&amp;#160;&amp;#160;&amp;#160;&amp;#160;&amp;#160;&amp;#160;&amp;#160;&amp;#160;The increase in the fair value of the Series&amp;#160;C Preferred warrants from issuance in March 2011 through IPO in October of 2012, totaled $55,000 and has been recorded in warrant and other interest income (expense), net, in the statements of operations and comprehensive loss, and included interest expense of $91,000 and interest income of $36,000 for the years ended December&amp;#160;31, 2012 and 2011, respectively. The decrease in value of the Series&amp;#160;D Preferred warrants from issuance in December 2011 through IPO in October of 2012 totaled $18,000 and has been recorded in warrant and other interest income (expense), net, in the statement of operations and comprehensive loss for the year ended December&amp;#160;31, 2012. There was no change in the fair value of the Series&amp;#160;D Preferred warrants during the year ended December&amp;#160;31, 2011 due to the timing of issuance.&lt;/font&gt;&lt;/p&gt;
&lt;p style="FONT-FAMILY: times"&gt;&lt;font size="2"&gt;&amp;#160;&amp;#160;&amp;#160;&amp;#160;&amp;#160;&amp;#160;&amp;#160;&amp;#160;In December of 2012, the warrants to purchase 120,000 shares of common stock were net exercised on a cashless basis for 49,000 shares of common stock. There were no warrants outstanding as of December&amp;#160;31, 2012.&lt;/font&gt;&lt;/p&gt;
&lt;p style="FONT-FAMILY: times"&gt;&lt;font size="2"&gt;&amp;#160;&amp;#160;&amp;#160;&amp;#160;&amp;#160;&amp;#160;&amp;#160;&amp;#160;Included in warrant and other interest income (expense), net for the year ended December&amp;#160;31, 2012 was amortization of debt issuance costs of $272,000 and interest expense related to the note payable of $169,000. The balance of accrued interest expense at December&amp;#160;31, 2012 was $22,000. The remaining unamortized debt issuance cost at December&amp;#160;31, 2012 was $1,076,000.&lt;/font&gt;&lt;/p&gt;
&lt;p style="FONT-FAMILY: times"&gt;&lt;font size="2"&gt;&amp;#160;&amp;#160;&amp;#160;&amp;#160;&amp;#160;&amp;#160;&amp;#160;&amp;#160;The credit facility includes various covenants. As of December&amp;#160;31, 2011 and 2012, we were in compliance with all covenants associated with the credit facility.&lt;/font&gt;&lt;/p&gt;
&lt;p style="FONT-FAMILY: times"&gt;&lt;font size="2"&gt;&amp;#160;&amp;#160;&amp;#160;&amp;#160;&amp;#160;&amp;#160;&amp;#160;&amp;#160;Future maturities of the Note payable as of December&amp;#160;31, 2012 are as follows:&lt;/font&gt;&lt;/p&gt;
&lt;div style="PADDING-RIGHT: 0pt; PADDING-LEFT: 0pt; PADDING-BOTTOM: 0pt; MARGIN-LEFT: 15%; WIDTH: 70%; PADDING-TOP: 0pt; POSITION: relative"&gt;
&lt;p style="FONT-FAMILY: times"&gt;&lt;font size="2"&gt;&lt;!-- COMMAND=ADD_TABLEWIDTH,"100%" --&gt;&lt;/font&gt;&lt;/p&gt;
&lt;!-- User-specified TAGGED TABLE --&gt;
&lt;div align="center"&gt;
&lt;table style="WIDTH: 552px; HEIGHT: 161px" cellspacing="0" cellpadding="0" width="552" border="0"&gt;
&lt;tr style="HEIGHT: 0px"&gt;&lt;!-- TABLE COLUMN WIDTHS SET --&gt;
&lt;td style="FONT-FAMILY: times" align="left"&gt;&lt;/td&gt;
&lt;td style="FONT-FAMILY: times" width="12"&gt;&lt;/td&gt;
&lt;td style="FONT-FAMILY: times" align="right" width="7"&gt;&lt;/td&gt;
&lt;td style="FONT-FAMILY: times" width="65"&gt;&lt;/td&gt;
&lt;td style="FONT-FAMILY: times" width="12"&gt;&lt;/td&gt;&lt;!-- TABLE COLUMN WIDTHS END --&gt;&lt;/tr&gt;
&lt;tr style="HEIGHT: 0px" valign="bottom" bgcolor="#CCEEFF"&gt;
&lt;td style="FONT-FAMILY: times"&gt;
&lt;p style="MARGIN-LEFT: 10pt; TEXT-INDENT: -10pt; FONT-FAMILY: times"&gt;&lt;font size="2"&gt;2013&lt;/font&gt;&lt;/p&gt;&lt;/td&gt;
&lt;td style="FONT-FAMILY: times"&gt;&lt;font size="2"&gt;&amp;#160;&lt;/font&gt;&lt;/td&gt;
&lt;td style="FONT-FAMILY: times" align="right"&gt;&lt;font size="2"&gt;$&lt;/font&gt;&lt;/td&gt;
&lt;td style="FONT-FAMILY: times" align="right"&gt;&lt;font size="2"&gt;1,500,000&lt;/font&gt;&lt;/td&gt;
&lt;td style="FONT-FAMILY: times"&gt;&lt;font size="2"&gt;&amp;#160;&lt;/font&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr style="HEIGHT: 0px" valign="bottom" bgcolor="white"&gt;
&lt;td style="FONT-FAMILY: times"&gt;
&lt;p style="MARGIN-LEFT: 10pt; TEXT-INDENT: -10pt; FONT-FAMILY: times"&gt;&lt;font size="2"&gt;2014&lt;/font&gt;&lt;/p&gt;&lt;/td&gt;
&lt;td style="FONT-FAMILY: times"&gt;&lt;font size="2"&gt;&amp;#160;&lt;/font&gt;&lt;/td&gt;
&lt;td style="FONT-FAMILY: times"&gt;&lt;font size="2"&gt;&amp;#160;&lt;/font&gt;&lt;/td&gt;
&lt;td style="FONT-FAMILY: times" align="right"&gt;&lt;font size="2"&gt;2,000,000&lt;/font&gt;&lt;/td&gt;
&lt;td style="FONT-FAMILY: times"&gt;&lt;font size="2"&gt;&amp;#160;&lt;/font&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr style="HEIGHT: 0px" valign="bottom" bgcolor="#CCEEFF"&gt;
&lt;td style="FONT-FAMILY: times"&gt;
&lt;p style="MARGIN-LEFT: 10pt; TEXT-INDENT: -10pt; FONT-FAMILY: times"&gt;&lt;font size="2"&gt;2015&lt;/font&gt;&lt;/p&gt;&lt;/td&gt;
&lt;td style="FONT-FAMILY: times"&gt;&lt;font size="2"&gt;&amp;#160;&lt;/font&gt;&lt;/td&gt;
&lt;td style="FONT-FAMILY: times"&gt;&lt;font size="2"&gt;&amp;#160;&lt;/font&gt;&lt;/td&gt;
&lt;td style="FONT-FAMILY: times" align="right"&gt;&lt;font size="2"&gt;1,500,000&lt;/font&gt;&lt;/td&gt;
&lt;td style="FONT-FAMILY: times"&gt;&lt;font size="2"&gt;&amp;#160;&lt;/font&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr style="FONT-SIZE: 1.5pt; HEIGHT: 0px" valign="top"&gt;
&lt;td style="FONT-FAMILY: times" valign="bottom"&gt;&amp;#160;&lt;/td&gt;
&lt;td style="FONT-FAMILY: times" valign="bottom"&gt;&amp;#160;&lt;/td&gt;
&lt;td style="BORDER-BOTTOM: #000000 1pt solid; FONT-FAMILY: times" valign="bottom" align="right" colspan="2"&gt;&amp;#160;&lt;/td&gt;
&lt;td style="FONT-FAMILY: times" valign="bottom"&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;
&lt;tr style="HEIGHT: 0px" valign="bottom" bgcolor="white"&gt;
&lt;td style="FONT-FAMILY: times"&gt;
&lt;p style="MARGIN-LEFT: 10pt; TEXT-INDENT: -10pt; FONT-FAMILY: times"&gt;&amp;#160;&lt;/p&gt;&lt;/td&gt;
&lt;td style="FONT-FAMILY: times"&gt;&lt;font size="2"&gt;&amp;#160;&lt;/font&gt;&lt;/td&gt;
&lt;td style="FONT-FAMILY: times"&gt;&lt;font size="2"&gt;&amp;#160;&lt;/font&gt;&lt;/td&gt;
&lt;td style="FONT-FAMILY: times" align="right"&gt;&lt;font size="2"&gt;5,000,000&lt;/font&gt;&lt;/td&gt;
&lt;td style="FONT-FAMILY: times"&gt;&lt;font size="2"&gt;&amp;#160;&lt;/font&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr style="HEIGHT: 0px" valign="bottom" bgcolor="#CCEEFF"&gt;
&lt;td style="FONT-FAMILY: times"&gt;
&lt;p style="MARGIN-LEFT: 10pt; TEXT-INDENT: -10pt; FONT-FAMILY: times"&gt;&lt;font size="2"&gt;Unamortized debt issuance cost&lt;/font&gt;&lt;/p&gt;&lt;/td&gt;
&lt;td style="FONT-FAMILY: times"&gt;&lt;font size="2"&gt;&amp;#160;&lt;/font&gt;&lt;/td&gt;
&lt;td style="FONT-FAMILY: times"&gt;&lt;font size="2"&gt;&amp;#160;&lt;/font&gt;&lt;/td&gt;
&lt;td style="FONT-FAMILY: times" align="right"&gt;&lt;font size="2"&gt;(1,076,000&lt;/font&gt;&lt;/td&gt;
&lt;td style="FONT-FAMILY: times"&gt;&lt;font size="2"&gt;)&lt;/font&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr style="FONT-SIZE: 1.5pt; HEIGHT: 0px" valign="top"&gt;
&lt;td style="FONT-FAMILY: times" valign="bottom"&gt;&amp;#160;&lt;/td&gt;
&lt;td style="FONT-FAMILY: times" valign="bottom"&gt;&amp;#160;&lt;/td&gt;
&lt;td style="BORDER-BOTTOM: #000000 1pt solid; FONT-FAMILY: times" valign="bottom" align="right" colspan="2"&gt;&amp;#160;&lt;/td&gt;
&lt;td style="FONT-FAMILY: times" valign="bottom"&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;
&lt;tr style="HEIGHT: 0px" valign="bottom" bgcolor="white"&gt;
&lt;td style="FONT-FAMILY: times"&gt;
&lt;p style="MARGIN-LEFT: 10pt; TEXT-INDENT: -10pt; FONT-FAMILY: times"&gt;&amp;#160;&lt;/p&gt;&lt;/td&gt;
&lt;td style="FONT-FAMILY: times"&gt;&lt;font size="2"&gt;&amp;#160;&lt;/font&gt;&lt;/td&gt;
&lt;td style="FONT-FAMILY: times"&gt;&lt;font size="2"&gt;&amp;#160;&lt;/font&gt;&lt;/td&gt;
&lt;td style="FONT-FAMILY: times" align="right"&gt;&lt;font size="2"&gt;3,924,000&lt;/font&gt;&lt;/td&gt;
&lt;td style="FONT-FAMILY: times"&gt;&lt;font size="2"&gt;&amp;#160;&lt;/font&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr style="HEIGHT: 0px" valign="bottom" bgcolor="#CCEEFF"&gt;
&lt;td style="FONT-FAMILY: times"&gt;
&lt;p style="MARGIN-LEFT: 10pt; TEXT-INDENT: -10pt; FONT-FAMILY: times"&gt;&lt;font size="2"&gt;Current portion&lt;/font&gt;&lt;/p&gt;&lt;/td&gt;
&lt;td style="FONT-FAMILY: times"&gt;&lt;font size="2"&gt;&amp;#160;&lt;/font&gt;&lt;/td&gt;
&lt;td style="FONT-FAMILY: times"&gt;&lt;font size="2"&gt;&amp;#160;&lt;/font&gt;&lt;/td&gt;
&lt;td style="FONT-FAMILY: times" align="right"&gt;&lt;font size="2"&gt;(1,160,000&lt;/font&gt;&lt;/td&gt;
&lt;td style="FONT-FAMILY: times"&gt;&lt;font size="2"&gt;)&lt;/font&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr style="FONT-SIZE: 1.5pt; HEIGHT: 0px" valign="top"&gt;
&lt;td style="FONT-FAMILY: times" valign="bottom"&gt;&amp;#160;&lt;/td&gt;
&lt;td style="FONT-FAMILY: times" valign="bottom"&gt;&amp;#160;&lt;/td&gt;
&lt;td style="BORDER-BOTTOM: #000000 1pt solid; FONT-FAMILY: times" valign="bottom" align="right" colspan="2"&gt;&amp;#160;&lt;/td&gt;
&lt;td style="FONT-FAMILY: times" valign="bottom"&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;
&lt;tr style="HEIGHT: 0px" valign="bottom" bgcolor="white"&gt;
&lt;td style="FONT-FAMILY: times"&gt;
&lt;p style="MARGIN-LEFT: 10pt; TEXT-INDENT: -10pt; FONT-FAMILY: times"&gt;&lt;font size="2"&gt;Note payable&amp;#8212;net of current portion&lt;/font&gt;&lt;/p&gt;&lt;/td&gt;
&lt;td style="FONT-FAMILY: times"&gt;&lt;font size="2"&gt;&amp;#160;&lt;/font&gt;&lt;/td&gt;
&lt;td style="FONT-FAMILY: times" align="right"&gt;&lt;font size="2"&gt;$&lt;/font&gt;&lt;/td&gt;
&lt;td style="FONT-FAMILY: times" align="right"&gt;&lt;font size="2"&gt;2,764,000&lt;/font&gt;&lt;/td&gt;
&lt;td style="FONT-FAMILY: times"&gt;&lt;font size="2"&gt;&amp;#160;&lt;/font&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr style="FONT-SIZE: 1.5pt; HEIGHT: 0px" valign="top"&gt;
&lt;td style="FONT-FAMILY: times" valign="bottom"&gt;&amp;#160;&lt;/td&gt;
&lt;td style="FONT-FAMILY: times" valign="bottom"&gt;&amp;#160;&lt;/td&gt;
&lt;td style="BORDER-BOTTOM: #000000 2.25pt double; FONT-FAMILY: times" valign="bottom" align="right" colspan="2"&gt;&amp;#160;&lt;/td&gt;
&lt;td style="FONT-FAMILY: times" valign="bottom"&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;&lt;/table&gt;&lt;/div&gt;
&lt;!-- end of user-specified TAGGED TABLE --&gt;&lt;/div&gt;&lt;/div&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 information about short-term and long-term debt arrangements, which includes amounts of borrowings under each line of credit, note payable, commercial paper issue, bonds indenture, debenture issue, own-share lending arrangements and any other contractual agreement to repay funds, and about the underlying arrangements, rationale for a classification as long-term, including repayment terms, interest rates, collateral provided, restrictions on use of assets and activities, whether or not in compliance with debt covenants, and other matters important to users of the financial statements, such as the effects of refinancing and noncompliance with debt covenants.</ElementDefenition><ElementReferences>Reference 1: http://www.xbrl.org/2003/role/presentationRef

 -Publisher FASB

 -Name Accounting Standards Codification

 -Topic 505

 -SubTopic 10

 -Section 50

 -Paragraph 3

 -URI http://asc.fasb.org/extlink&amp;oid=6928386&amp;loc=d3e21475-112644



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

 -Publisher SEC

 -Name Regulation S-X (SX)

 -Number 210

 -Section 02

 -Paragraph 19, 20, 22

 -Article 5



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

 -Publisher FASB

 -Name Statement of Financial Accounting Standard (FAS)

 -Number 129

 -Paragraph 2, 4

 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.  This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.



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 210.5-02.19,20,22)

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



</ElementReferences><IsTotalLabel>false</IsTotalLabel><UnitID>0</UnitID><Label>Note Payable</Label></Row></Rows><Footnotes /><IsEquityReport>false</IsEquityReport><ReportName>Note Payable</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://www.kytherabiopharma.com/role/DisclosureNotePayable</RoleURI><NumberOfCols>1</NumberOfCols><NumberOfRows>2</NumberOfRows></InstanceReport>
