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Fair Value of Financial Instruments (Tables) | 6 Months Ended
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Jun. 30, 2016
Fair Value of Financial Instruments | 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 |

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- Definition Tabular disclosure of assets and liabilities, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19190-110258 + Details
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