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Fair Value of Financial Instruments (Tables) | 3 Months Ended
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Mar. 31, 2018
Fair Value Disclosures [Abstract] |
Fair Value of Financial Instruments | The following tables set forth the fair value of the Company’s financial instruments (in millions):
|  | As of March 31, 2018 |
|  | Carrying Amount |  |  | Significant Unobservable Inputs (Level 3) |  |  | Fair Value |
Financial liabilities: |  |  |  |  |  |  |  |  |  |  |  |
Senior convertible notes (2021 notes) |  | $ | 24.4 |  |  | $ | 19.9 |  |  | $ | 19.9 |
Facility financing obligation |  |  | 43.7 |  |  |  | 50.1 |  |  |  | 50.1 |
Note payable to related party |  |  | 72.2 |  |  |  | 68.8 |  |  |  | 68.8 |
Milestone rights |  |  | 8.9 |  |  |  | 17.8 |  |  |  | 17.8 |
Total financial liabilities |  | $ | 149.2 |  |  | $ | 156.6 |  |  | $ | 156.6 |
|  | As of December 31, 2017 |
|  | Carrying Value |  |  | Significant Unobservable Inputs (Level 3) |  |  | Fair Value |
Financial liabilities: |  |  |  |  |  |  |  |  |  |  |  |
Senior convertible notes (2021 notes) |  | $ | 24.4 |  |  | $ | 19.8 |  |  | $ | 19.8 |
Facility financing obligation |  |  | 52.7 |  |  |  | 54.6 |  |  |  | 54.6 |
Milestone rights |  |  | 8.9 |  |  |  | 19.1 |  |  |  | 19.1 |
Total financial liabilities |  | $ | 86.0 |  |  | $ | 93.5 |  |  | $ | 93.5 |

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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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