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Secured Convertible Notes and Related Common Stock Purchase Warrants (Tables) | 9 Months Ended
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Sep. 30, 2018
Debt Disclosure [Abstract] |
Summary of Convertible Notes | Convertible Notes, Net consisted of the following at September 30, 2018:
(in millions) |  | Interest rate |  | Conversion price |  |  | Principal |  |  | Unamortized Discount |  |  | Net Amount |  |  | Accrued Interest |
June 2018 Convertible Note, as amended1 |  | 8.0% |  | $ | 1.75 |  |  | $ | 3.4 |  |  | $ | (1.5 | ) |  | $ | 1.9 |  |  | $ | 0.1 |
July 2018 Convertible Note, as amended2 |  | 8.0% |  |  | 1.75 |  |  |  | 2.2 |  |  |  | (1.7 | ) |  |  | 0.5 |  |  |  | 0.01 |
August 2018 Convertible Note3 |  | 8.0% |  |  | 1.75 |  |  |  | 3.3 |  |  |  | (2.9 | ) |  |  | 0.4 |  |  |  | 0.01 |
September 2018 Convertible Note4 |  | 8.0% |  |  | 1.75 |  |  |  | 0.5 |  |  |  | (0.5 | ) |  |  | — |  |  |  | — |
Total Convertible Notes Payable, Net |  |  |  |  |  |  |  | $ | 9.4 |  |  | $ | (6.6 | ) |  | $ | 2.8 |  |  | $ | 0.1 |
1 The June 2018 Convertible Note matures as follows: 75% on December 4, 2018; 25% on December 4, 2019 2 The July 2018 Convertible Note matures as follows: 75% on January 20, 2019; 25% on January 20, 2020 3 The August 2018 Convertible Note matures as follows: 75% on March 1, 2019; 25% on March 1, 2020 4 The September 2018 Convertible Note matures as follows: 75% on March 21, 2019; 25% on March 21, 2020
Schedule of Inputs Used to Value the Series D Warrants | The Company valued the June 2018 Series D Warrants using the following inputs:
|  | June 2018 Series D Warrant |  |  | June 2018 Pre- Funded Series D Warrants
Expected life (in years) |  |  | 5.0 |  |  | 5.5 - 6.5
Expected volatility |  | 194.10% |  |  | 215.0% - 389.0%
Risk-free interest rates |  | 2.78% |  |  | 2.13% - 2.30%

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- Definition Tabular disclosure of borrowings which can be exchanged for a specified number of another security at the option of the issuer or the holder. Disclosures include, but are not limited to, principal amount, amortized premium or discount, and amount of liability and equity components. + References No definition available. + Details
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- References No definition available. + Details
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- Definition Tabular disclosure of input and valuation technique used to measure fair value and change in valuation approach and technique for each separate class of asset and liability measured on recurring and nonrecurring basis. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb) -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258 + Details
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