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Fair Value Measurement | 12 Months Ended
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Dec. 31, 2015
Fair Value Disclosures [Abstract] |
Fair Value Measurement | Note 3. Fair Value Measurement Fair value is defined as an exit price, representing the amount that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants. As such, fair value is a market-based measurement that should be determined based on assumptions that market participants would use in pricing an asset or a liability. As a basis for considering such assumptions, we are required to apply a three-tier value hierarchy, which prioritizes the inputs used in the valuation methodologies in measuring fair value. The three levels of the fair value hierarchy are: 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 an entity to maximize the use of observable inputs and minimize the use of unobservable inputs when measuring fair value. Assets measured at fair value as of December 31, 2015 and 2014 are classified below based on the three fair value hierarchy tiers described above. Our cash equivalents are classified as Level 1 because they are valued primarily using quoted market prices. We estimated the fair value of our loan payable using the net present value of the payments discounted at an effective interest rate. We believe the estimates used to measure the fair value of our loan payable constitute Level 3 inputs. Our liability for warrants issued in our 2011 financing is classified as Level 3 as the liability is valued using a Monte Carlo simulation model. Some of the significant 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, all of which are observable from active markets. However, the use of a 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 our financial assets and liabilities measured at fair value as of December 31, 2015:
|  | Fair Value Measurement at Reporting Date Using |  |  |  |
|  | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |  | Unobservable Inputs (Level 3) |  |  | As of December 31, 2015 |
Financial assets |  |  |  |  |  |  |  |  |  |  |  |
Cash equivalents: |  |  |  |  |  |  |  |  |  |  |  |
Money market funds |  | $ | 2,544,475 |  |  | $ | — |  |  | $ | 2,544,475 |
U.S. Treasury debt obligations |  |  | 11,158,400 |  |  |  | — |  |  |  | 11,158,400 |
Total financial assets |  | $ | 13,702,875 |  |  | $ | — |  |  | $ | 13,702,875 |
Financial liabilities |  |  |  |  |  |  |  |  |  |  |  |
Loan payable net of discounts |  | $ | — |  |  | $ | 10,334,029 |  |  | $ | 10,334,029 |
Warrant liabilities |  |  | — |  |  |  | 770,964 |  |  |  | 770,964 |
Total financial liabilities |  | $ | — |  |  | $ | 11,104,993 |  |  | $ | 11,104,993 |
Level 3 Reconciliation The following table presents a roll forward for liabilities measured at fair value using significant unobservable inputs (Level 3) for 2015.
|  | Warrant Liabilities |
Balance at December 31, 2014 |  | $ | 1,684,551 |
Add change in fair value of warrants |  |  | (913,587 | )
Balance at December 31, 2015 |  | $ | 770,964 |
|  | Loan Payable |
Balance at December 31, 2014 |  | $ | 15,020,417 |
Less repayments of principal |  |  | (4,778,485 | )
Add accretion of discount |  |  | 92,097 |
Balance at December 31, 2015 |  | $ | 10,334,029 |
Current portion |  | $ | 1,417,388 |
Non-current portion |  |  | 8,916,641 |
Balance at December 31, 2015 |  | $ | 10,334,029 |

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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 820 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 30 -URI http://asc.fasb.org/extlink&oid=6957238&loc=d3e14172-108612 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=6957238&loc=d3e14064-108612 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 21 -URI http://asc.fasb.org/extlink&oid=49121117&loc=d3e13537-108611 Reference 5: 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=49121117&loc=d3e13504-108611 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=49121117&loc=d3e13433-108611 + Details
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