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Fair Value Measurements | 6 Months Ended
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Jun. 30, 2016
Fair Value Measurements |
Fair Value Measurements | 11. Fair Value Measurements The Company follows accounting guidance that emphasizes that fair value is a market‑based measurement, not an entity specific measurement. Fair value is defined as “the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date.” Fair value measurements are defined on a three level hierarchy: Level 1 inputs: Unadjusted quoted prices for identical assets or liabilities in active markets; Level 2 inputs: Quoted prices for similar assets and liabilities in active markets, quoted prices in markets that are not active, or inputs which are observable, weather directly or indirectly, for substantially the full term of the asset or liability; Level 3 inputs: Unobservable inputs that reflect the Company’s own assumptions about the assumptions market participants would use in pricing the asset or liability in which there is little, if any, market activity for the asset or liability at the measurement date. As of June 30, 2016 and December 31, 2015, the fair values of cash and cash equivalents, other assets, accounts payable and accrued liabilities approximated their carrying values because of the short‑term nature of these assets or liabilities. The estimated fair value of the Company’s Interim Notes was based on amortized cost which was deemed to approximate fair value. The derivative liability associated with the conversion premium on the Interim Notes was based on cash flow models discounted at current implied market rates evidenced in recent arms‑length transactions representing expected returns by market participants for similar instruments which were based on Level 3 inputs. There were no transfers between fair value hierarchy levels during the three and six months ended June 30, 2016 and 2015. The fair value of financial instruments measured on a recurring basis is as follows (in thousands):
|  | As of June 30, 2016 |
Description |  | Total |  | Level 1 |  | Level 2 |  | Level 3 |
Liabilities: |  |  |  |  |  |  |  |  |  |  |  |  |
Premium conversion derivative |  | $ | 243 |  | $ | — |  | $ | — |  | $ | 243 |
Total liabilities at Fair Value |  | $ | 243 |  | $ | — |  | $ | — |  | $ | 243 |
|  | As of December 31, 2015 |
Description |  | Total |  | Level 1 |  | Level 2 |  | Level 3 |
Liabilities: |  |  |  |  |  |  |  |  |  |  |  |  |
Premium conversion derivative |  | $ | 345 |  | $ | — |  | $ | — |  | $ | 345 |
Total liabilities at Fair Value |  | $ | 345 |  | $ | — |  | $ | — |  | $ | 345 |
The following table provides a roll‑forward of the Company’s premium conversion derivative liabilities measured at fair value on a recurring basis using unobservable level 3 inputs (in thousands):
|  | For the Six Months Ended June 30, |
|  | 2016 |  | 2015 |
Balance as of beginning of period |  | $ | 345 |  | $ | 73 |
Issuance of underlying convertible notes |  |  | 505 |  |  | 232 |
Change in fair value of premium conversion derivative |  |  | (607) |  |  | 380 |
Redemption of underlying convertible notes |  |  | — |  |  | (685) |
Balance as of end of period |  | $ | 243 |  | $ | — |
There were no financial instruments measured on a non‑recurring basis for any of the periods presented.

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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=66048111&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=73719730&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=73719730&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=73719730&loc=d3e13433-108611 + Details
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