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Warrants and Derivative Liabilities (Details 3) - Monte Carlo simulations - Emerald Financing Warrant Liability | Mar. 31, 2019 Percent $ / shares | Dec. 31, 2018 | Dec. 31, 2018 $ / shares | Dec. 31, 2018 USD_per_warrants | Dec. 31, 2018 Percent | Feb. 16, 2018 | Feb. 16, 2018 $ / shares | Feb. 16, 2018 USD_per_warrants | Feb. 16, 2018 Percent | Jan. 19, 2018 | Jan. 19, 2018 $ / shares | Jan. 19, 2018 USD_per_warrants | Jan. 19, 2018 Percent
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Class of Warrant or Right [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Underlying common stock price | $ 0.69 |  | $ 0.40 |  |  |  |  |  |  |  |  |  |
Minimum |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Underlying common stock price |  |  |  |  |  |  | $ 0.29 |  |  |  | $ 0.29 |  |
Maximum |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Underlying common stock price |  |  |  |  |  |  | $ 0.30 |  |  |  | $ 0.30 |  |
Dividend yield |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Warrants and rights outstanding measurement input | 0.00 |  |  | 0.00 | 0.00 |  |  | 0.00 | 0.00 |  |  | 0.00 | 0.00
Volatility factor |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Warrants and rights outstanding measurement input |  |  |  |  |  |  |  | 70.00 | 70.00 |  |  | 70.00 | 70.00
Volatility factor | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Warrants and rights outstanding measurement input | 90.9 |  |  | 92.1 | 92.1 |  |  |  |  |  |  |  |
Volatility factor | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Warrants and rights outstanding measurement input | 91.2 |  |  | 92.4 | 92.4 |  |  |  |  |  |  |  |
Risk-free interest rate |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Warrants and rights outstanding measurement input | 2.20 |  |  | 2.49 | 2.49 |  |  |  |  |  |  |  |
Risk-free interest rate | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Warrants and rights outstanding measurement input |  |  |  |  |  |  |  | 2.45 | 2.45 |  |  | 2.45 | 2.45
Risk-free interest rate | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Warrants and rights outstanding measurement input |  |  |  |  |  |  |  | 2.6 | 2.6 |  |  | 2.6 | 2.6
Expected term (years) |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Expected Term |  |  |  |  |  | 5 years |  |  |  | 5 years |  |  |
Expected term (years) | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Expected Term | 3 years 9 months 18 days | 4 years 18 days |  |  |  |  |  |  |  |  |  |  |
Expected term (years) | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Expected Term | 3 years 10 months 17 days | 4 years 1 month 17 days |  |  |  |  |  |  |  |  |  |  |

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