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Fair Value Measurement | 6 Months Ended
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Jun. 30, 2012
Fair Value Measurement [Abstract] |
Fair Value Measurement | Note 3. Fair Value Measurement The following tables present our assets and liabilities that are measured at fair value on a recurring basis and are categorized using the fair value hierarchy. The fair value hierarchy has three levels based on the reliability of the inputs used to determine fair value. Level 1 — Observable inputs that reflect quoted prices (unadjusted) for identical assets or liabilities in active markets. Level 2 — Directly or indirectly observable inputs other than in Level 1, that include quoted prices for similar assets or liabilities in active markets or quoted prices for identical or similar assets or liabilities in markets that are not active. Level 3 — Unobservable inputs which are supported by little or no market activity that reflects the reporting entity’s own assumptions about the assumptions that market participants would use in pricing the asset or liability. The fair value hierarchy also requires us to maximize the use of observable inputs and minimize the use of unobservable inputs when measuring fair value. Our cash equivalents are classified within Level 1 because they are valued primarily using quoted market prices. Our bonds payable, marketable debt securities, and liability for warrants issued in our 2008 and 2009 financing, are classified within Level 2 as they are valued using alternative pricing sources and models utilizing market observable inputs. Our liability for warrants issued in our 2011 financing classified within Level 3 is valued using the Monte Carlo simulation model. Significant Level 3 inputs used to calculate the fair value of warrant liability include our stock price on the valuation date, expected volatility of our common stock as traded on NASDAQ, and risk-free interest rates that are derived from the yield on U.S. Treasury debt securities. In addition to using the afore mentioned observable inputs, the use of the Monte Carlo simulation model requires the input of additional subjective assumptions including management’s assumptions regarding the likelihood of a re-pricing of these warrants pursuant to anti-dilution provisions and the progress of our R&D programs and its affect on potential future financings. The following table presents financial assets and liabilities measured at fair value:
|  | Fair Value Measurement at Report Date Using |  |  |  |  |  |  |
|  | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |  | Significant Other Observable Inputs (Level 2) |  |  | Unobservable Inputs (Level 3) |  |  | As of June 30, 2012 |
Financial assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash equivalents: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Money market funds |  | $ | 470,600 |  |  | $ | — |  |  | $ | — |  |  | $ | 470,600 |
U.S. Treasury debt obligations |  |  | 6,539,986 |  |  |  | — |  |  |  | — |  |  |  | 6,539,986 |
Marketable securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt securities |  |  | — |  |  |  | 1,699,814 |  |  |  | — |  |  |  | 1,699,814 |
Total financial assets |  | $ | 7,010,586 |  |  | $ | 1,699,814 |  |  | $ | — |  |  | $ | 8,710,400 |
Financial liabilities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Bond obligation |  | $ | — |  |  | $ | 430,000 |  |  | $ | — |  |  | $ | 430,000 |
Warrant liabilities |  |  | — |  |  |  | 6,152 |  |  |  | 5,390,018 |  |  |  | 5,396,170 |
Total financial liabilities |  | $ | — |  |  | $ | 436,152 |  |  | $ | 5,390,018 |  |  | $ | 5,826,170 |
Level 2 Reconciliation The following table presents a roll forward for financial assets and liabilities measured at fair value using significant other observable inputs (Level 2) for 2012.
|  | Level 2 Beginning Balance 12/31/11 $ |  |  | Transfers to Level 1 $ |  |  | Change included in earnings $ |  |  | Settled $ |  |  | Level 2 Ending Balance 06/30/12 $ |
Marketable debt securities |  |  | 3,280,591 |  |  |  | (1,580,777 | ) |  |  | — |  |  |  | — |  |  |  | 1,699,814 |
Bond obligation |  |  | 522,500 |  |  |  | — |  |  |  | — |  |  |  | 92,500 |  |  |  | 430,000 |
Warrant liabilities |  |  | 31,195 |  |  |  | — |  |  |  | (25,043 | ) |  |  | — |  |  |  | 6,152 |
Transfers from Level 2 to Level 1 are maturities of short term marketable debt securities into cash and cash equivalents. Level 3 Reconciliation The following table presents a roll forward for liabilities measured at fair value using significant unobservable inputs (Level 3) for 2012.
|  | Warrant Liabilities |
Balance at December 31, 2011 |  | $ | 6,011,120 |
Less fair value of warrants exercised |  |  | (1,095,801 | )
Less fair value of warrants expired |  |  | (3,560,063 | )
Add fair value of warrants issued |  |  | 1,714,436 |
Add change in fair value of warrants |  |  | 2,320,326 |
Balance at June 30, 2012 |  | $ | 5,390,018 |

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- Definition The entire disclosure for the fair value of financial instruments (as defined), including financial assets and financial liabilities (collectively, as defined), and the measurements of those instruments as well as disclosures related to the fair value of non-financial assets and liabilities. Such disclosures about the financial instruments, assets, and liabilities would include: (1) the fair value of the required items together with their carrying amounts (as appropriate); (2) for items for which it is not practicable to estimate fair value, disclosure would include: (a) information pertinent to estimating fair value (including, carrying amount, effective interest rate, and maturity, and (b) the reasons why it is not practicable to estimate fair value; (3) significant concentrations of credit risk including: (a) information about the activity, region, or economic characteristics identifying a concentration, (b) the maximum amount of loss the entity is exposed to based on the gross fair value of the related item, (c) policy for requiring collateral or other security and information as to accessing such collateral or security, and (d) the nature and brief description of such collateral or security; (4) quantitative information about market risks and how such risks are managed; (5) for items measured on both a recurring and nonrecurring basis information regarding the inputs used to develop the fair value measurement; and (6) for items presented in the financial statement for which fair value measurement is elected: (a) information necessary to understand the reasons for the election, (b) discussion of the effect of fair value changes on earnings, (c) a description of [similar groups] items for which the election is made and the relation thereof to the balance sheet, the aggregate carrying value of items included in the balance sheet that are not eligible for the election; (7) all other required (as defined) and desired information. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 16 -URI http://asc.fasb.org/extlink&oid=7491637&loc=d3e13504-108611 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 107 -Paragraph 15C, 15D -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 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 44A, 44B -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 Statement of Financial Accounting Standard (FAS) -Number 107 -Paragraph 15A -Subparagraph a-d -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 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 107 -Paragraph 3, 10, 14, 15 -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 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=7491637&loc=d3e13433-108611 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 159 -Paragraph 17-22, 27, 28 -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. 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