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Convertible Notes Payable (Tables) | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2019 | Dec. 31, 2018
Debt Disclosure [Abstract] |  |
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
Contractual life |  | 5.0 |  | 5.5 - 6.5
Expected volatility |  | 194.10% |  | 215.0% - 389.0%
Risk-free interest rates |  | 2.78% |  | 2.13% - 2.30%
Summary of the Notes by Maturity Dates | The following tables provide a summary of the various notes issued at June 30, 2019 and December 31, 2018:
(in millions) |  | Conversion price |  |  | Current interest rate |  |  | Principal |  |  | Unamortized discount |  |  | Carrying value |
Short term convertible notes payable |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
8.0% 2018 Notes |  | $ | 1.75 |  |  |  | 18 | % |  | $ | 0.6 |  |  |  | (0.1 | ) |  | $ | 0.5 |
Short term notes payable |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
8.0% 2018 Notes |  |  | — |  |  |  | 18 | % |  |  | 5.0 |  |  |  | (0.1 | ) |  |  | 4.9 |
8.0% 2019 Notes |  |  | — |  |  |  | 8 | % |  |  | 4.9 |  |  |  | — |  |  |  | 4.9 |
|  |  |  |  |  |  |  |  |  |  | 9.9 |  |  |  | (0.1 | ) |  |  | 9.8 |
Balance at June 30, 2019 |  |  |  |  |  |  |  |  |  | $ | 10.5 |  |  | $ | (0.2 | ) |  | $ | 10.3 |
(in millions) |  | Interest rate |  |  | Conversion price |  |  | Principal |  |  | Unamortized discount |  |  | Carrying value |
December 4, 2018 |  |  | 8.0 | % |  | $ | 1.75 |  |  | $ | 1.7 |  |  | $ | — |  |  | $ | 1.7 |
March 1, 2019 |  |  | 8.0 | % |  | $ | 1.75 |  |  |  | 0.6 |  |  |  | (0.5 | ) |  |  | 0.1 |
March 21, 2019 |  |  | 8.0 | % |  | $ | 1.75 |  |  |  | 0.4 |  |  |  | (0.2 | ) |  |  | 0.2 |
December 4, 2019 |  |  | 8.0 | % |  | $ | 1.75 |  |  |  | 0.9 |  |  |  | (0.9 | ) |  |  | — |
March 1, 2020 |  |  | 8.0 | % |  | $ | 1.75 |  |  |  | 0.8 |  |  |  | (0.8 | ) |  |  | — |
March 21, 2020 |  |  | 8.0 | % |  | $ | 1.75 |  |  |  | 0.1 |  |  |  | (0.1 | ) |  |  | — |
Balance at December 31, 2018 |  |  |  |  |  |  |  |  |  | $ | 4.5 |  |  | $ | (2.5 | ) |  | $ | 2.0 |
| The following table provides a summary of the Notes by their maturity dates (absent provisions of default):
(in millions) |  | Interest rate |  |  | Conversion price |  |  | Principal |  |  | Unamortized Discount |  |  | Carrying value |
December 4, 2018 |  |  | 8.0 | % |  | $ | 1.75 |  |  | $ | 1.7 |  |  | $ | — |  |  | $ | 1.7 |
March 1, 2019 |  |  | 8.0 | % |  |  | 1.75 |  |  |  | 0.6 |  |  |  | (0.5 | ) |  |  | 0.1 |
March 21, 2019 |  |  | 8.0 | % |  |  | 1.75 |  |  |  | 0.4 |  |  |  | (0.2 | ) |  |  | 0.2 |
December 4, 2019 |  |  | 8.0 | % |  |  | 1.75 |  |  |  | 0.9 |  |  |  | (0.9 | ) |  |  | — |
March 1, 2020 |  |  | 8.0 | % |  |  | 1.75 |  |  |  | 0.8 |  |  |  | (0.8 | ) |  |  | — |
March 21, 2020 |  |  | 8.0 | % |  |  | 1.75 |  |  |  | 0.1 |  |  |  | (0.1 | ) |  |  | — |
Total Convertible Notes Payable, net |  |  |  |  |  |  |  |  |  | $ | 4.5 |  |  | $ | (2.5 | ) |  | $ | 2.0 |

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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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- 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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