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Fair Value of Financial Instruments | 6 Months Ended
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Jun. 30, 2016
Fair Value of Financial Instruments | 8. Fair Value of Financial Instruments The Company applies various valuation approaches in determining the fair value of its financial assets and liabilities within a hierarchy that maximizes the use of observable inputs and minimizes the use of unobservable inputs by requiring that observable inputs be used when available. Observable inputs are inputs that market participants would use in pricing the asset or liability based on market data obtained from sources independent of the Company. Unobservable inputs are inputs that reflect the Company’s assumptions about the inputs that market participants would use in pricing the asset or liability and are developed based on the best information available in the circumstances. The fair value hierarchy is broken down into three levels based on the source of inputs as follows: Level 1— Quoted prices for identical instruments in active markets. Level 2— Quoted prices for similar instruments in active markets; quoted prices for identical or similar instruments in markets that are not active; and model-derived valuations whose inputs are observable or whose significant value drivers are observable. Level 3— Significant inputs to the valuation model are unobservable. The availability of observable inputs can vary among the various types of financial assets and liabilities. To the extent that the valuation is based on models or inputs that are less observable or unobservable in the market, the determination of fair value requires more judgment. In certain cases, the inputs used to measure fair value may fall into different levels of the fair value hierarchy. In such cases, for financial statement disclosure purposes, the level in the fair value hierarchy within which the fair value measurement is categorized is based on the lowest level input that is significant to the overall fair value measurement. Cash and cash equivalents Cash equivalents consist of highly liquid investments with original or remaining maturities of 90 days or less at the time of purchase, that are readily convertible into cash. As of June 30, 2016 and December 31, 2015, the Company held $63.7 million and $59.1 million, respectively, of cash and cash equivalents, consisting primarily of money market funds of $56.8 million and $55.8 million, respectively, and the remaining in non-interest bearing checking accounts. The fair value of these money market funds was determined by using quoted prices for identical investments in an active market (Level 1 in the fair value hierarchy). Related-Party Arrangement The fair value of the note payable to our principal stockholder cannot be reasonably estimated as the Company would not be able to obtain a similar credit arrangement in the current economic environment. Financial liabilities The following tables set forth the fair value of our financial instruments (in millions):
|  | As of June 30, 2016 |
|  | Level 1 |  |  | Level 2 |  |  | Level 3 |  |  | Total |
Financial liabilities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Senior convertible notes |  | $ | — |  |  | $ | — |  |  | $ | 21.8 |  |  | $ | 21.8 |
Facility financing obligation |  |  | — |  |  |  | — |  |  |  | 79.9 |  |  |  | 79.9 |
Milestone rights |  |  | — |  |  |  | — |  |  |  | 15.6 |  |  |  | 15.6 |
Sanofi Loan Facility |  |  | — |  |  |  | — |  |  |  | 62.0 |  |  |  | 62.0 |
Warrant liability |  |  | — |  |  |  | — |  |  |  | 18.1 |  |  |  | 18.1 |
Total financial liabilities |  | $ | — |  |  | $ | — |  |  | $ | 197.4 |  |  | $ | 197.4 |
|  | As of December 31, 2015 |
|  | Level 1 |  |  | Level 2 |  |  | Level 3 |  |  | Total |
Financial liabilities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Senior convertible notes |  | $ | — |  |  | $ | — |  |  | $ | 21.3 |  |  | $ | 21.3 |
Facility financing obligation |  |  | — |  |  |  | — |  |  |  | 78.4 |  |  |  | 78.4 |
Milestone rights |  |  | — |  |  |  | — |  |  |  | 14.4 |  |  |  | 14.4 |
Sanofi Loan Facility |  |  | — |  |  |  | — |  |  |  | 36.5 |  |  |  | 36.8 |
Total financial liabilities |  | $ | — |  |  | $ | — |  |  | $ | 150.6 |  |  | $ | 150.6 |
Senior convertible notes The estimated fair value of the 2018 notes was calculated based on model-derived valuations whose inputs were observable, such as the Company’s stock price and yields on U.S. Treasury notes and actively traded bonds, and non-observable, such as the Company’s longer-term historical volatility, and estimated yields implied from any available market trades of the Company’s issued debt instruments. As there is no current active and observable market for the 2018 notes, the Company determined the estimated fair value using a convertible bond valuation model within a lattice framework. The convertible bond valuation model combined expected cash flows based on terms of the notes with market-based assumptions regarding risk-free rate, risk-adjusted yields (20%), stock price volatility (87.5%) and recent price quotes and trading information regarding Company issued debt instruments and shares of common stock into which the notes are convertible (Level 3 in the fair value hierarchy). Facility Agreement As discussed in Note 13 — Facility Agreement, in connection with the Facility Agreement, the Company issued 2019 notes and subsequently issued Tranche B notes (the “Facility Financing Obligation”). As there is no current observable market for the 2019 notes or Tranche B notes, the Company determined the estimated fair value using a bond valuation model based on a discounted cash flow methodology. The bond valuation model combined expected cash flows associated with principal repayment and interest based on the contractual terms of the debt agreement discounted to present value using a selected market discount rate. On June 30, 2016 the market discount rate was recalculated at 11.0% for the 2019 notes and for the Tranche B notes, which reflected decline in the market price of benchmark U.S. Treasury securities as compared to prior measurement date (Level 3 in the fair value hierarchy). In addition to the 2019 notes and Tranche B notes, the Company also issued certain rights to receive payments of up to $90.0 million upon occurrence of specified strategic and sales milestones (the “Milestone Rights”). These rights are not reflected in the facility financing obligation. The estimated fair value of the Milestone Rights was calculated using the income approach in which the cash flows associated with the specified contractual payments were adjusted for both the expected timing and the probability of achieving the milestones discounted to present value using a selected market discount rate (Level 3 in the fair value hierarchy). The expected timing and probability of achieving the milestones, starting in 2014, was developed with consideration given to both internal data, such as progress made to date and assessment of criteria required for achievement, and external data, such as market research studies. The discount rate (14.0%) was selected based on an estimation of required rate of returns for similar investment opportunities using available market data. As of June 30, 2016, the carrying value of the Milestone Rights is $8.9 million, classified as a long-term liability in other liabilities and the fair value is estimated at $15.6 million. Sanofi Loan Facility As discussed in Note 7 — Collaboration arrangement, the Sanofi Loan Facility consists of a senior secured revolving promissory note and a guaranty and security agreement with an affiliate of Sanofi which provides the Company with a secured loan facility of up to $175.0 million to fund the Company’s share of net losses under the Sanofi License Agreement. The estimated fair value was determined using a discounted cash flow model in which time outstanding and discount rate were primary variables. This method considered the key elements of the contractual terms of the Sanofi Loan Facility, market-based estimated cost of capital, and time value of money, namely the amount of time to settlement and the estimated discount rate (11%) appropriate for the liability (Level 3 in the fair value hierarchy). As of June 30, 2016 the carrying value of the Sanofi Loan Facility is $70.3 million and the fair value is estimated at $62.0 million. Warrant liability Warrant liabilities are measured at fair value using a Monte Carlo pricing valuation model. The assumptions used in the valuation model for the common stock warrant liabilities were: (a) a risk-free interest rate based on the rates for U.S. Treasury zero-coupon bonds with maturities similar to those of the remaining contractual term of the warrants; (b) an assumed dividend yield of zero percent based on the Company’s expectation that it will pay no dividends in the foreseeable future; (c) an expected term based on the remaining contractual term of the warrants; and (d) an expected volatility based upon the Company’s historical volatility over the remaining contractual term of the warrants and probability of a dilutive financing that may trigger a price protection clause. The significant unobservable input used in measuring the fair value of the common stock warrant liabilities is the expected volatility. Significant increases in volatility would result in a higher fair value measurement. (Level 3 in the fair value hierarchy) See note 14 – Warrants for further discussion.

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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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